https://cpw.cvlcollections.org/files/original/52326cdee186d6049ef62d1343d85b7c.pdf d42b4f400b023a725726c3fbe6e1936c PDF Text Text .,i ,- I I SfAD 8 DAD QOUJR4Dt l!F!?ember 19 1 1948 1. title of Projeoia - I. Supervisor I a. Investlgato~• 4. Introduoidon1 Mr. A. E. Borell, biologist tor the V. ·S. Soil Conservation Service requaste4 the hpartmmit•s oooparatioa 1D. maldBg three small priw.te ponds suitable tor game fish produoid.cm by eracU.oating trash fish pt-esmrl: with den-is. Sinoe lt 1s aatiolpated that i't will be neoesaary to use 4erris on pubU.o waters 1n the future. it was 4eems4 ad• visable to gain experienoe ia using this poison by treating these small eaq to work pemla. fheretore, on the 17th and. 18th of lepteaer. R. H. PIBLIUDIARY DPOI! 011 VSE OF DBBllIB BOG! Ill !DD SMALL LADS Gilbert ll. Jlmter a. B. Jtess Aasinmrt Investigator, w. D. IQem Reas and w. D. ne1B, Senior Fish !eoh.Jlioiam, and Lloyd Searls, temporary employee of the Deputment., worked in ooopera:bion with Ur. Borell Uld the 1J. s. Soil Oonaervat1en man trom the Central Oolorado listriot in treating the ponds wUm urr11. fbis Department reoeived exoellen oooperation and assinan.oe trom the Soil Oouervatlon mm throughout the work and we wish to express our thanks to Mr. Borell, Mr. Selby Yeung and the other man from the Oentral Colorado. clistriot tor their help. a. ( !he largest lake treatecl (a sudaoe aores) is on the Lewis 1?mi,t about five miles oast ot Colorado Springs. !his lake contained oarp. ' oattish, ou baas. greGD sunfish au two er more apeolea ot mlzmows. !he lake waa treatecl with clerris a:b the rate of 1.1 parts derria to 1.000,000 pans water by weight. It is telt a total ld.11 was att,,.;,../. S\umnary1 en all species of fish. A farther oheok w.1.11 'be made on this lake. CJatt!sh were moh more nsietent .to the toxio etfeo'b of rotenone ~ • u:y ot the other speoies ot fish enoouatere4 :ln our worko !he other two lakes treated ware mah smaller than the Lswla . ~ d the same remlta obtained. •as in the larger lake. It was felt 1J7'0h iutanoe that a total kill was obtained. / ' J'reamrater shrimp were livl:ag normally &.tter 46 yours in the tiCed water. / Derria is a good praotioal way of eliminating undesirable pollds. a. leoommendationa • 1. 1. rJ• small ~rrla is used w1 thout hesitation . in small lakes or p~n easier methods, suoh as draining, are not teasible 'ht: m;, body of water ot llJ!desirable fish and where the lake• it ;of trash fish• will produoe game fish. / 81nee treatment ot the 1'wo smaller ponds is onliJ'lti.pe~ tioa. on a smaller eoale ot the work done on the Lewis J,ake at not be disou.ssed. further 1D tale rep0:rt, but will be ooverecl, ely atier Reports final oheoka on the ponds have bee• macle. • 1 I 1 / �4-- fhe Lewis Lake is looat~d about tive miles east ot Colorado Springs. It is roughly trianpiar 1D shape, covers two 8\lrtaoe aores, total volume a aore feet, maaimm clppth 8 ten, average depth tour ten, spring fed and has about a 7& yard long slew at the upper end, • !his sls is aeparate4 from the lake at the presenii time by a narrs strip ot land. Borell reoommended this lake be poisoud beoause it oonta.:lned large nllmbers ot oarp,·and small green sunfish. the lake. it given mt-. a new start ooulcl prodll~e good bass and bluegill f":l.shb.g. Although it appeared that a total kill was at.teoted in the lake it• self the slew was diffioult to tree.ii beO&llse of the dense growth of oatta.11s and duekweecl present aact it ls possible that it fish were in this area soma may have lived. fhe alewwas treated by rnh::lng der.ria to a light batter With.water au admiatJrtering by hand from bucko1ss. It was impossible to ti.pre the qwm.tl tt of water ill auchbaa area lnlt what seemed to be more than eneugh to kill, was distributed. !here was a large hole at the lower end ot the slew which a seine haul shon4 oonbainacl oarp and green sunfish. Denis was applied to this area by hand atter being mlxe4 w1 th wa:te~. Green sunfish ap.peared. at the aurtaoe, 1-2 minutes after poisoning showing signs ot . distress and in another five mimltea seemed oompleteiy out of oo,d;rol and were even toroing themselvea out on the bank. Eighteen mlnutea after poisoniBg the oarp began to appear at tu B11rfaoe and soo~ began 1:o die. Approaimately• ou •hour after poiaom.Dg oat.fish, 4 to 6 lnohes lag, appeared at the aurf'aoe showing signs ot.moh distress. !he gills et all the fish observed after they had oome to the surfaoe were a very 'bright reel giving an mm&.tural. iDtlamecl appearanoe. ,01SOJW!g ~ the lake oomrnenoecl at 12116 ,.m. and wq oompleted at ltlO P.H. Three methods ot diatribu tuag the 4errls was used, 18:dng with water to a light batter ooneiatenoy and apr1nkl111g the JJJlrtRire in the shoal water b7 hand, mixing wi t'b. wat•r 1;e a llpt liquid oonsiatenoy and spraying by a hand operated tire pump gu.n an.cl dngg!:.ag weighted burlap· saoks oomainbg tlerria 1:hrOllgh the wateF, 'bo'bh from a boat •and from shore. Dragging the wei.ghte4 aaolm through the vndser wae done to clistribute the roteuae throughout the deeper water. !he fish bl the lake reaoted·mu.oh 1D the same ma.rmer as did those b the hole at tae lower end of the slew1 mbncnrs •and green sunfish began showing distress in about ten mlsmtea and then the smaller oarp (711 to 9°) oame to the aurta.oe followed by the larger earp. !he oB1y :t,aas (lt lbs.) tou.cl was on the shor~ about 46 mimtes attar-poisoning had started. In about an hour oatti·sh, one to two lnohea long, appeared at the sartaoe 1D shoal water. At·a,4& P.M. the orew left the Lewis Lake 'be poison one of the small ponds 'and re'l:lwned at 6100 P.M. At that t1lmte large eattish (6" to 12" long) ware at the surtaoe and showing distress. The earp, green nnf'ieh. minnows and small oattish ~r~ praotioally all dead or nearly so. fbe orew 4epar'be4 the lake at th f)8 P. M. and rehrned 68 ·hours la-ta:r-. By thea. all the fish visible were dead. ezaept a few ot the larger oattieh whioh seemed to have lost their G411ilibrium and were in obvious distress. !he majority of the oatfi'sh were dead. �'t . ' ;' . / .'.. ~.L-- ··fhree hauls were macle 'Viith a 80' seine and several oattiah, still alive but 1D bad shape, were obtainacl and also om oarp that showed sips of lite. fhe live oatfish and oarp were plaoe4 iD ~ trough ot fresh water to see if they would revive. A report on these ft8h has not yet 'been ebt·at:oed. • Judging• from the appevaoe of the gills and general aotions of all tish toad alive, none vrOlll.d live. • Symptoms of roto:aone poisoning are as tollowaa Coming to the surface apparently trying to obtain air, sw1m:mlng about aimlessly at tih9 surtaoe, rapid_ swimming or violent tlirashbg it touohed. 'but soon subaiting, lose ot equilibrium 1n more advanoed aiiagea, 'bright red t.»tlema4 gills, remainlng almost stationery with mouth out .ot •water and tail nearly straight 40\'lll a11.d latt stages· w,ith f'iah ly!Jlg on side or 'b'aok near the aurtaoe with oaly oooasioaal breatldJ&g movmmnts. About halt an !lour after poisoning the aurtaoe ot the lake 'becomes alive with ti.ah swimsmbg a.imlessl7 about. !here was a nott-oeable tendenc,y tor the atteoted fish to work into the shoal areas. Although the different speoiea of fish encountered all ahowei some variatt.on 1n the time it took them to be atteoted DJ' the rotenone, this tilne dUferenoe was only great enough·in the oa.se of the·oattlah to have praotioal sigaitioanoe. !he oattish is definitely more resistent to ro'benou 'blwl· the othe, speoies ellootmtered and this woultl be an advantage if poison.bg in a lake where iii was not desirable to kill the oattish. hrther reports oa this lake may show that some oatfish survivad and therefore strong ooaoentratiou •ot rotonone mat be used ill attempting to eradicate when oattish are prea&nt. Attar 46 hours freshwater. shrimp were not atfeote4 in any apparent way by the toteune. Cattle were· permittad to drink the treated water the day after poison• lag and showed·no efteots.trom the rcrtenone. Because of bexperienee in the use ot 4err1s. a sU.ghtly stronger oonoentrat:loa was obtained. than waa originally plamled. !he 4errla was mixed as the work progressed and when the· planned 1 p.p.m. point was reaohed: the lake had not been completely ooverecl. In the future, when using derria, the total amoua ot 4erria neoesaaey will be weighed. out before the work oommenoes· and the distribution of •tho. poison aan then be better oontrolled. A ooneentrat1on of 1.2 parts derris to 1.000,000 parts water by weight was used tn I.eris Lake. 'lh.iriy one poud.s of clenis were used in the lake ·and slew tor a total ooat of llT.98 per temperatures in the lake ·were, bottom temperainlre 61 'f. at 11100 A.M.J surtaoe '11 F. at 8180 P.U, fhe hole at the lover end. of the slew was 66 F. at 11146 A.M. All temperatures are tor 17 Sept., day of poisoning. pouncl. Temperature baa some bearing on. tbs etteotiveness ot rotenone 1n kill• mg fish. Lesa rotenone is needed at higher temperatures. fhe lakee poisomclwere sm.11, easy to treat, eaey to e'baerve ad offered. several speoies ot fish to work with. .!he lntormatlon obtained trom work cm these lakes will be ot value when there is need tor using 4err1s on larger bodies ot water. 8. &l'bmltteds 1'amet I. B. Besa - W. Do lloin fitle, Ir. Fish feofuitolana �ftAjt! 08LOIUQ DAB . , _.. ao, 1HG 1. fi11le of Pro~eota -- Use of Derrls loot ill fteh 11anagemn1s a. Supsrnaor, a. Iawrilgatort W.. D. ltleb. 4. Iutroduott.ona file Daparbent ha4 oo.casioa to uee dents root· reoentl7 to kill trash tlsh on a anall soale and the reSlllils wtre nry enoouragbag. Berrie le the most praot·1oa1 mnhod of oonisrolltng or el'a4loating uclests-able tieb ln mnf s ttu&.t1.ons en4 wl 11 u.Ddou\~edly th4 b.oreasing use tn. i1le management ot fishing waters in th.le stat,. ·fherdore, this report ls; aabmitisecl to esplato the· ao-tloa of tbia drag on fish and the·b' ellVl.romiBDb and to atlim the advantages to be gained from udng 4erria as well as eoms problems that might arise it tta tmd.olty to flab becomes OOmmGD Jmowleclge •. 60 ~ :ls a fiaely pew4eN4 root of tOl"alga oJ'igia that oOlltalaa a Gilbert ll. Bimter drug oalled rotenone as the ao'iive lapeclimn. a•. Pomlered derrle root ae ao14 OOJIDUffOially oonta.1111 48&· to '" ntenoue. a. Berrie is v.sad as an S:aseot1elde and oa 'be puroh&Ge4 'byE:Q\l10U witlloln aaJ' U.mitaticms at atone selling ina~iolclee, clng houses, some clng.-storeo and diatributore ot ohemleals. 4. file Denver Fire Olav Oompaay 111otes derris et ••• pw pomul. &. Boteum ls extremely toxle to tia.ll and will ldll aom9 apeoles whea ue4 a't ilhe rate of .& pans clerrte to 1,000,000 parts water by weight. Where eradloation ot tlsh ls claslrad l ppm. ls the usual dosage. e. loteDCDJ8 atteo1Sa the gllla aa4 08\1Bea 'the fish to a\:lffooate. All ld.ma et fish are &tteo1se4. '1. flail 'begin to clle •la water 1sreate4 with del'r1s ln 10 'to 20 mmutes and a high toxlolt,- remain& tor at least 24 hours. • a. ftsh killed with rotenoll8 are fit tor eating by mdmal, man iaoluded.. 9o Wtlter traate4 with 4orria la not texio when 00DB11med b7 oattle u4 it is p~samed this. applies to other &Dimals also. lOo Some aquatlo luaots a.ml orutaoiana are D\1Boeptab1e to polsoabg in water treatecl with 4errla. 11. lotenou does no1s effect aquatio vegetation adversely. 180 !he length ot aou degee ot tald.-,lt, to trout ill clerria weate4 wateJ"a ·varies with looal oomlit:Leu, but sq mdaend to1: as long as a month, �13.. Waters trt>ated w1 th derris are not permanently damaged for tieh. 14. There are aev~ral reoords of lakeo cleaned of trash fish with derr1• aubaeguontlyboooming exoellent trout producers. 16. Derria hes been ueed very etteotiTely in eradication and control of tra1h fish in other states. 16. One handful of derria properly applied will kill or s erioualy etteot all th~ trout 1n an average sized beaver pond. 6. Rocor:mienda.tion, 1 1. Derria is used by State Game and Fieh Departfflnt biologiets to control or eradioate trash fish when it is good fieh management to do ao. 2. That it be unlawful tor any person to plaoe derrie root (rotenone) in a.nywater1 in thia atate in which fish have been stooked by the State ot Colorado or the u. S. Government. 3. That upon request of the owner. private water• •Y be treated with derria under the direot supervieion of a properly authorized State Game &nd Fi1h Department <mployee. 4. When private water• are treated the State Oame and Fish Departm9nt shall turnieh the neeoesary derri6 am. make a oharge suffioient to cover tho coat of the dorri1 to the atato. 5. All law enforoemBnt men be aoquainted with derda and its relation to fish. 7~ Discussions Derria has been uaed to aome extent controlling or erad1oating traah fiah 1n other states for e everal years. When used oorreotly it ha.a proven vary etfectlvo. lio1'ic,ver, thero are eom.8 inherent disadvantages to it1 use• At • 53 per pound the oost for poisoning one aoru foot of water is $1.43 -- rather expensive for large bodies ot water. It 1• dU'fioult to poison large bodie1 of water or deep bodies or water to obtain a total kill beoause the poison 1111st bo w•ll dispersed and the fine powder does not readily mix with water. It is eepeoially hard to ad•quately distribute the poison throughout the n.rious depths in a deep l&I:o. Roteno~ ie not Tery aeleotive in its etfeet on different opeoies ot fish and oonsequentlywhen an entire body ot watar ie poisoned all t.~e tish are killed. Thie is a bad f'aotor where a desirable speoiee iB present along with trash filh. It !1 dittieult to treat a portion of a stream with derria booauee the poiaon can easily be oarried in lethal cono•ntrationa to a poiht b~lo,rwhere poisoning ie deslred. Derr1s is beet adapted for use in small lakec (10 acres or lose) where ere.dioation of all fish is detired or in large bodioa of water when aohooled up, spawning trash fhh oan be killed in great munbers at a oost note xo~ssive. Howe,,er, in lnkes as large as 130 aoreo & oo~plete kills has been accomplished. �- sDerris la applied to a lake lA any manner that Vf111· gtye the most even and quloken 4ls'trihtloa. Usually lt 1s first mixed with water ia oosrtainffe and then O&ITled 1D bl&okets am aatria1ba4 lly had or placed in some aon·ot porbable hand pap at.Id spayocl over tu· watar. fo r t the poison to 'bhe lower ftter levels the .417 powder ls plaoa ill a weighted saok _au toweci behbld a boat. B:lnJdng aac,ks ot 4enis and clynam:tlng has •also been 4oae. A 'bo4y ot water ia 'bnated with 4enu to either •~trol an Ull4etiral,le speoies ot tiah or to obtain a total ·ld..11 or all t1sh lite la tha, 'body ot water. ID large 'bo41ea et water ooutrol ls usually the 01117 thmg teasablo. With oertat.n speolee ot trash tleh tha."h eohoetl in skoal waters to ~ • oontrel me&B\lres oan be vwy effeotl ve., South 1w1n Lake 1a Orego11 is an eaoellent eaample otwhat oaa be done Vllth.4errla to nalv.ap a lake taken over by t·rash tteh(I fhia 180 aore lake had an ·early record. ot exoellellb trouiJ prodt&cti.on nt CJh.ld,a ha4 beea lntroduoed somswhve along the •1b& amt the pleture oh'eag&tl l'fUl.. loally. Prom 1986 to 1940., a large ll\tliber ot small trout aad salmcm WGrG 'pleated (840,000) ba.t no tisbina N&lllted. $tats ld,c,loglna _. amlaed the lake and toad the dlttioulty to be a Vff1 large populatla of ·o1m1,a •. It was 4eold.Gd that eva thotagb the 1~ Wai. larp, a oomplet& kill with rot•oae would be attemptecl. !he lake ns -treated in April- 1941 with 4-ris and 36 iloJlS ~ ohu'ba wve doatroJSdo lbs onlf game fish toun.4 were tour silver aal-.za anri om rrd.dJaw and oae eastern l>NOk" After 17 '·wmths the lake was Nstooke4 WS.'tih pl~titna of WOUt macle at 19arl7 iDCJervals tl#OQSll 194-~ A total of 80,176 trout 11ere planted b this period. - lhe lake was oloaod to tlshfag from the time ot plsollbg un:li1 l!ay. 80. 1946. Du!»g the 1941 tlsldJI& aeaQODo .9.S&I vout were caught that had a total weight ot 9,898 pcnmds. 1. Prom the above eaamp~e it oea·n seen tbe.t.4tWrif's has a nr, detl•te plaOG la ·tt.ah lianagemellt;., It la ~pod tha:t la f\dau-e yea.rs -.t ma, be used wlaely ta this state amt wtth ·QdUtlonal good tiahi»g'. tu reaulto 1. lewcaml>, 11.1~. Senior Bio1ogl&t; Or$go11 State Gama C1cmmd.asior& Orego~ State Game Gommlu~ Btalletlno Vol. 1. Boe. 6.August 1H8. ,. Submitted "bFI Bame ft:tle w. D. n.eg az.. J'lah feoJmiotaa �__,, ~ o r lw:e. 11 t t.on pt.lrta or . At ii. f'h.t.o o 1.?chi. lhn. o(' tu .: ql,tlt w U io 1 f11, r de~i tJ !Jl ·~ .a. t lit tny «:ti ). .?l ~r m..;. eJ" '.) n-. ti Tb!Hto l II 1 �.• ·,. LQbt1 IO Ir. ®Qt> f t u.t.l .,o 1 WJ:mOl"ft.ti •• ~011. • it.."1 ~ r r to rie t~) Ul" :t.: ~t. 'Oft~O~C:i.o::l il1nlo. :. t1--e.u. Gd .:tlt.:h dorr1,G A1.: . oo ~ed. l. .1 l ~ Cit Of'Q8fl ac or.a • tD4 t,. oll'\ Itt di;.t ion ta poieo-uin& t tl·eE.tod r,· utDd in u-.11. ~ i' i~ 'l;-.t1t:iro longtn ol' l/2 rl.o ~t 1 Mt. oi.._~ ... O~O"»U t, 2:30 P. '• ~$· ~- • • • .:! ~1'.'\""a• .,., t, 0 .;.·, t �- ... . l'i. .i . . n r•.. h lf " n1 t e1 . nbly 1 at • ~sl i .. wti.~ de_ t Si r. •~l~. ' :p~1ir~GW "" •• • �·- -- ------ Color:ido S'l'ATE ---·· -·· D~TE_.!.:!I,;UEt l ~ Oct ober 1. 1947 L;i Title of Proj ect i 11 2ur't'"ey and study progrt..:11 to improvo r ishing ao-ndi tions of Meredith Laks o Gilbart u. H-.intor II<> Su-per~ris or s IIIa I nvoc';;igator a T. M• Lyr.oh !Vo I nt roduction, A pl:':>grsm 1"or i mpr"v~ment or ~·3.rm ,U,t ;)r .f ishing 1n Col ol'e.do r>!lll bo<:m eie·t; up by the Depar tml3nt o Mor oditb Lake is o~o of t!1e sevart.l 1 -~es u:i;ider obaorva tion ~ loc1tt.od in the /lrkr..:ne:ae Valley North of' Rooky P'ord o lo Ma:redith Lc.J.te 18 o-~$J por,u l at0d with. n.s:llbt'Jrt o!' ll'l.l',ni ly Cyprinidae ( mi nn<ffl'r:} o Im. ·overpopt\h i.t'..on nf ':l:i,tfhh iEi i,.h o pr«teon·bc, ~o Thi s 1£ke is an ir:dJ:.tl.)r, Neer,roir, tt.srotor o, i t proaente ~~hra probl ~mn or fl_u otua.ting l"-:.ttlr lovels v,h:\oh it.re of t en detrimentei.l t o no.tui-e.l aps.w11ingo 5o Speoitta or f iflh f ound ,...t Mci1· f::di tb ·1:-.y i:, cfoing the r.horo area ar e a Oyprini dao (Y:l.nno,;;s ) &o a~rp O O O o • ■ ■ ■ O $ ~ ~ 0 o O 9 o ·O b o Bl eoJ,..ree.d rrinnCffll' o<> Redfin Mim· mr o o • • o • do Pla5.ns '.i!n"Yir;w ,. "• " s D O O 0 Q ,, o Cypr inum oa.rpio Pimphalea promolas Notropi s lutrens!s FJbogm.>.thus epo e c Pl~ins Shine r • • • • • • . • Notroph Dp o CYPrino(iont.:.da.a (:o.,.ll.l. ~.:e1.e ) Pl atns Killi/:t,..h o c o o • Pl cnoteruz k~.:u;aa ti. ~ Bullhe ~d o o. o. o •• Centre.rohid1;,,e ( S•.1ur.·· eh~:2) So Grsc:i fa1nfis!1 • o t " 0 VIc D O Lepomi s oyan~lluo 4o lf.~ra,d i th Lal:a is a l?r.oe t r l l ~h ca l a.rot -~~ ::.th o. lmld b ot t OJ:10 5o Al ~ ., lligt ~r ac1u,4i.. tu pl·· :--.t n" l.\bundant o ..:~ choro v:,getatlon ie very ~oornmondatio~s s lo ~ha minnow popubtJ.c-::.. c :' ",· 1·:"1.:ith Lnl:0 tthc,'Jld be roc~toado 2o Intr oduction 01' c1tr n.'l.vo'°euc ( Garno? f i~h of' onra t ype, of anot her wou l d o.id in t he l:"<tducticr, of' tha minncr:r populationo �3oi 4o 6, other methods BUoh as seining, Mid tha usa or derris in. the epawni?Jg _beds of th9 om.rp allould rsduoe t:M.s f'hh populationo To rid the Lake of the over population or catfish the beat pouible inathod would pro'bebly b$ that ot hea.,-y fia¥ng 0 Meredith Lake iG G mUoe long and hns an m.ver·m.Ga width ot 2 ,miles~ VII_o It is a natural. lake, Diaoussiona 1~ The le.rg~ area. or 'Y3rodith Le.!::e end its use ae ran irrigation reaer~oir should sh<m" oonolueively that full contro~ of thie Lake 1B improbableJ howGvar, eoma improve~ent should bo poasibleo· 2o Int:roduetion or Crappie or Dass should p:rovo very ben.:,;fioial in ridding the Lake of some part of its over populati~no So If Crappie wers int;roduosd, ·they should ~o very well with all the tood (s~~ll minnows) present and thue·brlng about better ga?r.e fishing for the pso-ple of the areao �2 STATE COLORADO 1. TITLE: Fisheries Research Progress Report, Month of July, 1947 2. DATE: August 5, 1947 3. SUPERVISOR: I. Gilbert N, lrunter, Game and Fish Manager Ray H. Hess, Chief Fisheries Biologist North Fork of South Platte Project 1, This section of stream was re-opened to fishing after having been closed for a period of one week. The date of re-opening was July 4th. Eight thousand legal Rainbows and Lochs from the Denver Hatchery had been planted on June 28th in an effort to bring the catch per Tll!l.n hour up to 1.0. 2. A crew of six men from the research personnel and four men from the warden service contacted fishermen on this section on July 4, 5, and 6. Two research men were maintained on the section for the balance of the month. 3. Fi~e hundred end fifty-six fishermen were contacted on this section on July 4th. 1,874 fish were taken by these anglers in 1,730 hours of fishing for a catch per man hour of 1.083. During the 4, 5, and 6 of July a total of 1,024 fishermen were contacted, having caught a total of 2,633 fish in 3,081 hours for a catch per man hour of .854. Catches continued to drop off sharply until figures through the 22nd of July showed 1,808 fishermen had caught 3,653 fish in 5,132 hours fo~ a catch per man hour of .711. 4. An additional stocking of approximately 6,000 legal Rainbows is planned for early August in an effort to bring the catch per man hour back to near the 1.0 figure, which is considered "good" fishing. 5. Of the tagged Rainbows planted on April 16, 1947, 39% had been recovered on July 22nd. Of the Lochs planted on the same day, 38% have been recovere~. 6, From the June 28th plant, 24.6~ of the tagged Rainbows have been recovered and 12.6% of the Lochs from the same plant have been recovered, II. Tagging Projects 500 Rainbows averaging s½" and 500 Lochs averaging 911 were tagged from the Hershman Ponds and planted on Shadow Mountain reservoir on July 29th. 1. 2, Volunteer returns from tagged plants have been very encouraging. While a complete return could not possibly be hoped for, a number of plant areas have returned from 15% to 20% of the tags, which is sufficient for migration, growth and catch-by-species data. �- 2 - III. -Stream Survey 1 •. On July 1st tour two-man crews were started on the program ot basic survey or Colorado waters. This survey amollnts to a physical inventory. to be used tor stocking and other management practices. It is· hoped that an inventory of the main streams wi 11 be 0<''11pleted by tall. The com~ plate survey, .to. include secondary'streams and lakes, will require several years tor completion. • IV. Control ot Rough Fish with Derris Root ·1. ·Poisoning ot the Thatcher pond at Pueblo cruring June proved to be -~noompl,ete in removal or rough fishes, probably d11e to the use of confiscated derris which had lost much of its killing power. This pond was again poisoned during July, using fresh derris, and it is believed a complete kill:was effected. • V. Warm· Water' Program 1. Mr. Thomas Lynch· j.oined the Department on July 16 to work exclu• sively, as tar as weather will permit, on the problems or warm water fishing iti Colorado. 2_. Thu~ston an4 Holbrook lakes in particular have been studied· in an effort to. find means ot improving fishing. When water ~Di weather conditions permit, it'is planned to poison Thurston Lake with·derris root tor ·rt!moval of a_ll i'ish present. It will then be stocked with proper species. A trap at Hoibrook lake is planned to attempt removal ot some of the rough f'ish. VI. Miscellaneous.·· 1. Several individual surveys were made by members of the fisheries research personnel, reports. on which have b·een made separately. VII. Personnel 1. Full Time Ray H.- Reas '-'• D. Klein R. W. Lehti Wayne 'Seaman Thomas ·tynch W. L. Flinn 2. Temporary Clarence ·Weber• Paul Barrows Cleland Feast, Jr& Nathan Clifford Robert Evans Allan Cooter Wesley Nelson Robert Fair Dwight Roberts Resp~cttull submitted: a1 Ray . }l-'-44, • Hess 9hiet Fisheries Biologist �~ -p ooouu5o 3 Coior~do j Io TH;l3 of' P.Mj ~~ct:: TL, :~:--'jg~:~.3.T~ t.!Udi)_tt~~en to i;;Jpi:'"OV3 fi.~.shing c-,n.dltio:n;'! c.-t It11..1.r.t1ton La.keol L~a:.-p Coloi"3do 6 c.:.rd tha ua~ of D~;,r::.-,.o aa p;,1"'t or thi~ prog~amo 1 IIo Supsr:risorz IVo IntroduQtions lo The D~p-~rtmw1nt h~~ und,~n·tak~n tha impro"'!'~~snt of warm watel'" fiahing of Color~doo 2:- An intanaive ~tudy program s:.1d eurvay haa l',~sn .eiet up to d~terndn~ the caun~ of poor fishing conditions. and to find a ~~thod to reclaim th~sa "t:at~r ~r3amo 3c Thurston Lake ~aa s~leatad for tha r~moval of traah tish (Carp) by the us~ of darri6o ) t. 1 4:o A survey ws.G rr.ade o:? tha aqt.-.atic Hf-a and !"later oondi·tiona beCD fore and :..ftar ths u:3a of dsrri,1 ,a-'c the La.'\coo 60 The control or tr!:!.ah f'bh iz ox1a of th~ important ~tepa in le.ka iroprovemento "--I 60 Tre.sh :ri!lh •~rnoh a.B "th~ Cm-p he.~~ long proved th~~e!vea to b~ d~structive thrcugh the da7~:':~ld;ion of ve 6 istations feedii:g ground~, and sp~~~ine b~d3 of other fisna~o 7o P-oor .fi!lhing condi·bior..ts !at T.huroton La.ka lia7s r'9ault~d 9 at l;naet in par-t, thr,:m. 6h e.n o·:;-~r popul:1tion or tr~3h .ri~hg ( Carp) o Bo A propar bdanc~ of fiah p•'JfUl':\tion rI:....lat b3 ~ini:ai:ned to aupply good ~iahing oonditivnso 9o 'rhe Dapzar-ttt.t1nt finda tha b~3t mi?i"th~r!. in n,:~cr1ing fa-ash fbh la tbrough the ua.e o:? tlcJrrbc- lOo D9rria i8 a i'i-n.s:ty pcr-::1da:r~d root of f'~r•!3ign o::-:lg:Ln that oontaiZ14 ::r. drug cnlle<l rrrt-enm1.~ ~~ "tt:e ~•:1: i 7-o 'l.ngr~d.ianto C:lou1.eroially p,•.--.,d~?-ad c!or;-ie ! .. oc-t ccn-tain:J .~ -;:-, 6 p--9?cm~t z•ijt:c,no:n~-:: Ro·~•::it:·)~?: i_;; a~:::.·.J;i.~:!.y to:-:5.~ t.:: •:J~~U:F)~ t;::1 fi~h "Cr.> ..-::..tf!~:;.,:i_·:~-~.'.\ Y!c.:.-f_;or.J -t.r.:1:1t•ad Y~!.-tL cfori-i:3 ~YtQ n.:.t ~:n.'..~217:.~'i;.tly r:1~.?!'!~.g.."c fer fl~i:'1 J. ~~..f\) O �lo Fichi~.g oor..di t:tc;::i.c ~it 1·}~tu·~·br. !.:a~:::0 -~,31·::J "l:3!'Y p~~ox·., oa:!ifi!3'h bsing th-, only &:1r.ia fleh t s~t::i.~! ~E1'1 .:~l~csm t.n.1rnn r.ero of littl4' VF-.lue du'-1 .,Go th3ir on;~J.l c!.~t)o Ao B., Co D.;) Cyprinid;l.,a o o o o ,:, ~ o o o o o (TJi:al1/i~) f'ai.tlily A~!niui·:J.d!\e O O O O o o ·O O O O ( c~:...,.;fish) fl!.mily Cyprinodo:atld·~9 o o ; :i o o o o " {K:Ulfhh) !'aclly C,~mtrarcM.d:!).a o o o o c o o e o o ( Sm.1.f:1-ah) fsa-:;2ily Q O O 3o Thia CYPriuicL'ia t"f~jra ·che prcd.::r:ni~a....?1-c fla'h o!"' tha Lak-9 :1. nd among tha m21mbers of this !:'n!UilJ" ti1a C:arp wt,re in th~ majorityo ~o The .t\.m9iuricl~a fa:cily 11as repr,M~nt~d by th~ Blue and tha Bull= h. ~ad oii.tfi21ho Tha Dlu$ oa·~r- l~h Wti'?Jr3 nu:nb~H·sd a!3 t!!J'i!( "-tld eatohes oi' thia fish l7aro i·c:ir-ao ~fo~ Dullhsad m.nd;a up tha bulk of the fioharman °:, -oat oh ;;.t -the La.k-3 ~ hu.-tever • tho~~ f ia:h wera unusually s~llo ) 60 Tha C?J-prinodontidf~e f~mlly had o::1e Taprrtioe;1"ctl.ti v~ I) the Zebra topc,:minnow., whiuh stat1W ti, b~ pi"o~~i-."".; in all waters of the ars~o 60 Of the C~ntr~l·rJh:lda~,, •!;'he gr~an e,mfish appaarod to b~ the only ropr-a:sentativao 8:i Phytoplam1ton ~md rJ.oat:..-~g 21u:,.·!:i-o plRntf:J w:;r-~ r:zu,.~ly fo\Od in e::1y numb:!t:r:" nbout th-, Ln}.:·~o 9c- lOo P!'1ytopl~:actoa i9 tr.a b~ola ~o,;dd ,Hr.actly or i:ndir:?:totly& for all aquati._, 1ifl9o Pl~::.!lton i:J tl:0 1-:3.~!!3 .::.;?r,1 :-.:d ·to t~u~ ~i3ilern.b1:~.;;~i of minuta ~re~=flo~1.-l;i'::"1i pl:-i._i.1t:; c::~/: ::1. ..: ~.:na1--:! -~· ( 1) 11 ..,. Pl--~rt..,.,.p"l'"' .... ,...,.. ......,"I -"'.:.J \.11v• a,-"--4..-.v -.4'.,1..,JL r·2·(:~-~>~1:; ~-- ~:.~..~·~:~·.1 J..:... :~l- 1,'B 7~h-:-.~~1 ~~;~ •1 ;rw :,., :~ g:):/: o ::. :".! ~lr.! ':'a'•:; ·.',.... L.;.I...., (?) ~.. :?1.~~~~ton c~n~~d.3t;. of ·:;-,10 g!"oups 3 Zoc..._•1..,,""o+, ... .,.. ;_.,••:.... .._ V•J.·-0 ;} lJ '. ~·· -:::1 ~? ~ --~- ) :~.-!t'.::I~~ ·:,,_.'"1 0 -~, :-.·-~'". :~;• ... ~, ...: "';:• i~:l :_;_·• .. ·.::· :.~~-; ·'~·;f·~·:._!_::_"~;. 1,::. ~~.tr·"'-:rJ h:n~J,.:r?l ~9 ··• ..... ·::1 ;~~~~'l-!") ~\·~<l bl"J.~;c; 'i'110 Z~.;;::_::·::.~~.n~:~: .:r:1 e~.~-•7tJj.:.:~::: F~r:.··· ~-~'-i~;:~r cf' !Jj .. ,c! ..~;o_;!·_. :.... ~~i• 1·;·.:tJ.:f:.1-:-~;1 e.14!J. r:n:.~t;,.c~~.:.1$,-, '~:i~~~ c:rt:~7-t:A-:'-~?:.!; !l f~..~:; tl:.-~ ).:'.~1·t~~~-.~J·'; ::.. t1·l;....~1l.;: of· th··~ Zoo1) l:a ·.,~.:: ~(}.7'"l ,:=.~~2<: i::~~ 1_ .,,. ~d J t~!- ~ ~:~ l :t:~!. ~, ~ -:,~or,:;,, c :1 ;_: ·1;:..:.;,~.\1 r, t~_-rtd c ~~~::-:i.c! c<l~! ~ �140 r le.rva.-ao ) "-"' Ccll-c1c·Hv1:Jly 9 th!:> Z;:, :p:!.e.7 w--.:,:;,-r.. .'r.nd ?r:j-tvi"?l~noton aL""e inportazit as -the ba3ic sou~·c·::> •'.'JI' fo-:;d f:r:." t219 sr.:!:!.ll i~b.~39 and irurnct 150 Srn9.J.l .f'iah» {hrp~ c.nd it13f)c·:-; ler.vas e.re b:rg~ oonau~e:ra of th~ p~_c.:::1Jtcn org,;):t1!.aruo 160 170 Ir ~ glv"'!'n w::,t~:ir ~:--oa l~c.e f.!l o·'!:~r population of' CS\;;-p 0 oh~no~Hl e.ro that 7~-r-tJ li ttJ.o pl~no ton :--eaohe.3 th.a ste.gf:"J in ,;rhich it can be, utilhitd by th~ ga~e f.:~no 18::1 The "";",;a;~~ra of ~rhur:;ton L~:.ka 7--are often very turbid dua to -~ha action of . the Ca~tpo 19Q Turbidity pro.,1ar..ta p-·m~tra:tlcn of light 0 thfo in tu?"n outa down Phytoplanoton production~ PART II 20 The "!!'atar sur!o.ce t~:-1p-Jrat;..i.r,1J ·":,f!a.3 78 d3gre~s Fo at t ha time the derrie wan ua~d~ ) 3c Thai Laka ha.a B....'I\ arae. of en::-.d 155 cnl:d'ane S.Cl"'3S with s.n average d3pth of 2½ feat-:: E"",(c,-.,pt d~ri·~g periods of fluahi11g 8 only a small amount of aeap~g~ watsr ~ntara the lok9o 4o About l~6S0 pouw.b of ~-31--ri3 -;.r.3a put into ·t';,,s La_"(g by a .large group of Lar.:ar Sport~::,,gn d~ract~d by al::: 1~embsr~ of tha D~partment,, 5o Four hour3 after the op9ration wa.!! unde:nrny the larger fieh began to ~ho-a- signB of dor:--i.s ?"i:~ouingo Tan hcur:s a~ts1" -ths operations sta.rted 11 ths ?!c>rth a ho~,s -mu l:b.sd ~ith de~d fi3ho Bo ?fo't all the fiah on::;a ':o -t}:a ~1.trfacs a.fJ.;~r death; thia ":'iU· oapeoia.lly true wi ~h r~gard to thd oAtf'iaho '/ o The job wa;,g t}-.c:-...c~~~n-> a f~-~·;; e·1idi;mc0d by tha g-;;-o~t numb~r off iah csrca.!.139 linh.1g th:J t:l!~.t.:n·~ t:-:e fc l:.~in~ ds~f o 9~, ::~·~.-:.-: ~. rof..; :J.r~ .i.. ~.·.:,::?-i\~:· f ~)•::;t ~~:,·;-~:~._:~~,.:1 t-..;~r ~·~::.,.:, -~:l~:)::·~- li::!·;1 :t~~ .;:.p~!'J:!~.~~i;r3ly ~L ·J;; ~' S7 :Co~Zf~ ,:, '1.r.i.::i::~-~1 .t"o:... ,1'l'!>l ·i;?1n k.U.1 of 1~1:-:_~,:., :'i!.11: -'-'~ eg_u ~il •1:,:- ,:~:3 •. cd~3 J>cuctl;J a~d ~:::-!~:~ .,•. _... :~, ,.) .~ • r~ :(' :r·: J. ·_1. ~- ~-- ·>t :i ·: :. : ~ ·~·r: :, ~~- -~~ ~ ? i ~.. •_:.: ,. • :~j::! o 1 _·! lL Th,J;:"">3 ;;;;):r·.1 ~':G.,;G ,~-..1G::!:l or f::sh ::;,;:::r ~-::r·(i i::t th.iil ~·i . ~:1::"--::;_"G co:.!:1 .~i'r?S ·tl•~::} s.~~}.. l!! :r:- f:l~•~.r> I...s.~.':tJ'c, i'hi:l -:;;,~;:J �4i " 12., lo:) The dsrhlB 7>raa ;J.ddod ~o th3 L?.2!:a ?,!J.!-;~r::.Rs ~t lo4 PoPoillo 'l'h1a watl done bac?}.U'3•8 of tLa high or~~9.;1iz content end the pH of 9o0a In coroparl:-15 tha &n3.ll6r fi3hw ·'.::a mxr..b~r of 111-tioh waa equal 2pl5'.5,~:00 9 the an1,::>.Her Cr!_.rp trnre found to be in th9 ~jority,:, An c!3t1l!latsd ~rc~trtag3 s:1°~rn: ttJ c.,_toa'Jto.rnid~.'9 o C-3n·cri'-t·chida~ o o o o .. o .. o o o o o c. o o <> -> c> o ~ o o o o o o o .. o o o C:7;-r!:noclontid!:!.•a ) e ., .. o • .. .. • a o o 9 o o !) • o o o o Q o o o • o D o • • • o o • o 15 70 ~ o • o o o o o 45 o o o o o 26 o • c a o " o ., o c la Carp .. o 2o Other m1nno~a A:r.$uiri<l..3.e o Cyprin:ld::ie o l peroai:rb ~ 6 "w t) paroent ,t l4o Tha usa of' the derria at Thurston Lua bl"'ought forth two fbh speoiaa 1.tf'hich 1ia~e not known to Mife bsl9:a. pre,1ant in the Lakao A f ~ m9mbar'.!! of the Cato;·tomidoa:e ( suc!car) f'.'-mily and ona Black Crapp1o (Po~o~ia nigro=~ou~atu3)o l5o Sever.al Blue oa-tf'ioh (!otal.1ru! .f\1rc~tu1JL, w~ighing eight pour.di! and up~:rdL1 » 1t"'3ra t::.:.:ar. fro·~ tha Lake after t ha us~ of' derri.!Ja 160 ?!any of the J.u.rgs Carp 7;a1.•,, dofor.madJ this v~~ probably d uia to the lack of foodo 17 o Ploat of th" IrJ.llhaada :vhic··, wMn~d :i3h:>ro after t haa operationa -w,er~ or am.al?:. c: i za th!"ee t :. " six inch~ 13 o I) 190 The Zoo-.:,lar:.:1·-;cn 7raa :som~,".f 1,-:; re(.b.1cad aftei· th.a uaa of d,9rris at tl"i..i3- Lelu ~ howo1rer.) aE·;.;er the toA:i.ci:cy laft tha waters there wa.a a shsrp -1..:noreasa of -~i~-:-.usei or gt."\.111.;:1~ o to ·l:;h9 inc;,• ·~11~ of tbs Fijtoplanctono 200 Thia ~as probe.bly d us Af'ter thG t:.:SJ o.r the dfJ?'1·L;1.> th~ P.hytopb.notcn sha,r~d a sharp inoraa:i.e . : produo·ti v.t·hyo 7:ii.l 1.ncres.a~ -rcs..y be due to one of -blo thin:-f' l l(j 2o The .• :.ck of Carp f~·.d:i.~ U",?On it 0 or 'l\'1 ·r ,.·3 f"r:3:::"t:iJ. t:r.~r c.t -ia ·l tc tha Le.!,:a by -ch<? Carp carcaJ,~Ja o Th~j ·.~ :. oa:r:J~8a::1 ~e2" :~ i.~.c.; in t::~ b-2•~o f·:::1.. f'urti livl.tion puz-poa~:Jo Th::i -.:·, J1 ~-,~atl-?.t)l.. i~ -t:::n.t .·z 1'.::'. o::i.~1;,:; ;)d. thn c:7<::·o.::i.~ ;13 to d ecompoaa T'.:1;_) :l. ~1 ~ .., 0 \l.J~ .~.-t. ·tf1.~ I:.•).:•:·.: ~.,r:::\~-a l!~:,r:?·t•:;·::.~~ .---:':.."' :J.=.3.:·.~~t ~·::J~.p~fj1:~"? 9 c~ ~;:1{,::--~ a.-l~ ~-t-~·.- )·,=•:.:-·_~(1:1 {.~,~.r!.:I·~:-_. _. 1-;: ~:;-~' : t. .:,. r· -~.~:.:1 1~:.~~---~ :L·-~. ·~;·:-,~ L~"!.L:.) E~ ~=-~-~'.~?:~ !1...t~tJ~ ~-~·~:~~ t1r;--~ lo 5 9 -ol. . t11:--.3 &-~rtz·:L?~ r; I :?.c; ":T iJ ') f~.0;1 C:..:~:Jd Yi :LtM.u ~, '..',· ti! 12 --;:11.r·i.{)t~:~~ ~.-) ....:i~·-~s in ;G~.1-:J l_;~~!\.•-~J -3.~.1 S fi-3,-:~ ".~1... ,~ :.:le'!--. lL<;•··'d ":-'1'T~·::-· ~:l~~c~,::. D.t-; -~l~l?lot1,;1 cJ.;!tp~h;a to ;.;:.irt1'L;h Sulj Zebr;.\ top=minn~i'f:!o e--.,~21'J~1 �~M,c.- Thi& dcr:-i3 roo·t ~i:ich ·er~e u~ :;,d in tha proj:.:lrJt cv:d:::s.lnsd 508 ~roant rot~ncneo 260 Tha d·~rri~ing of TI:~i:-::ston L;j£a ~ro-:;'31 .n gals. affair for th:a La?::3r tu-,.z.specplao A ~on·t!nuouJ cra7ld. o.r ~ightds~ara thronge :l Lab; oho::--e a'tld ;;1a:.-..y .J. fi.;h ir:??.:i t~\:on h-:m~s for the fry ing p~n:) 0 t~L~ 260 So:r.e f''3~z- W!tZ a::::?r-=::~·rnd b~- !-;1-~~ pr:H,p!e 1h""ir.6 around tha Lal..:s ahora t:"lat th~ cdm.- cf t11-e c.cad f'ish no'.lld b~ u::::.~aa,.-ablep ho,rav.,::.·P ~t'-ter th-21 kiJ.l :~o.e I!\J.C.-3 s~d n nu:n~a:- of day-a pasnad.:> no or.9 sse~~d to object to tha ojo~o 270 A ~aak efter t~e Carp ~e~o oradicatad from t~e Lake~ thg watar aho,;$d no.turbidity of e.ny kindo VIo Reco::nmc,ndations s· lo A ratio of 1:8 Eals end Blu-:gill should ba etcc~d at Thur.3·bon Lak9 with 50 Bsss p9r ourfaoa aor~o 2o A etrict rule o!" ob.se;-v:s.ti'J~ and oontrol ehould be applied in regard to tha w~tar levsl and fioh population of the Lake~ Thia ohould be underta~3n both by the D~part:wnt and the local Sports~en 9 s Clubo 3o J Sone mathod ahould b3 proYidsd ·to remov3 sxo~sa tr~ah fish in the.tutur~~ This might be po~»ibla by th~ uaa of traps~ aein~ 9 etoo VIIo Di~euasion& lo Abgolutl! control of the f :bh pop"..l:1.ation at Thurs~on Laka will without a. dcubt prov'9 dif ;"icu lt d'.le to the ua~ of tha Lak9 aa a fluah baain oato~=allo 2o Th~ water leY9l at Th~?zto~ La!cs msy prov~ to b~ tae d~ciding faotor a.a to wh6tb~r good f Lsni:ii cc-cdi tiona are to bs h~d in the futurso 3o Plancton production of tha L?J~~ ia v~z-y good and ii' ths Carp are kapt at a 1d.n1~!!11 tha L'l~e ahould prove to b,a v&ry i'ertileo Thia"' in turn&' ·•;rill ~-~d th'3 g!i\ma f!.~h population to Z"l...ai-:0.t:1.in itMlf and to gl.v,:.ii .rorth ~i-th at:-o~g oo~pertftion to any tra!lh fisho 4o Thurr:1ton ia a typi,;al p1.. ~-d.d-9 la!ta in tha-t it ia sh.a.llo--1tp hard '1r.:~-~:..-" r~rtile ~ ~.:ra.i ~-;, t;1r,-•·;:-:··~ '.! ~.:)'.'lZlC.::-..nt Clg_~;.atio ·v,:, .s~:'l t?.ti,:>n O?l b,-: ·'.. ✓::,.: w ~:. ~::l sh.0:- 0 ) S:i t l ·J ~tt&· :.-. -:7) ·t l ..;;. !·:~ :J. ·j !. 'tl~t .:.: ·~ 1 ~.r :t:'.;~ 2.b ~..-~i'";:lrl 1,y l:,1J. }.. ~J.~~:~ ;.\l:~;) c~r'!;· !~ :.:~:~. o·~:-h~J't ~-,:·'J~~~.:.. !:':L :::·".o E1,., :---t-::.--:-:"'J11 of t.~n -1.'1~nt tv !:-!V•,-:) ·c11-; I"C•l~~~'l f' i '!;~:)iJ 1·-:>:-=-~7·:,~) ..,,:.:d :r01~"1-~oed. b~r g-~T.:!B :t::3!1aZJ .~ Ho7,Y7:3.;:~ t}:-3$13 J..:1.J::J.l 0-:.':.i '..'.'.i~t ~-?,L··:,· :~p.~::.3'':JL~ to;:- ::s.:ny -cf i.;~:;J w1IT:~ . &~:; f'_,~'.• ~·~3"., 6.:; ,...,..,.:i ~.a..:.- c-1-:r 1.~~ ,""-·•·:--j-~"-l"I ;.,.~. .;...., .._.j •.-1 •S.•- ~• ..:.. , ...... .J ~, - ::1 .... f'.-,.,...,l"'•'l'.'"I n,,,,~, .. ,3ha"'t -_,,.,&,_:;:.,. ~~:-~:-, . ~ .._,,,_ ... . ~ . _, .J..,, "V•J -;_ -~ ... ,lJ'7 ....... .,.,. .. -t ..... J.; .. ·..- •• ..1..1.;» A ~h~l 'la-;r J:1:.-ca ;f11..ic.1. ~-.3 Thu.:- ~rt~):. ::·;.:J.;,r p:·,::n·;:) to bs .:1. tnr1.0U.'.3 probl..')rJ. :'..n r-, 6 -1:rd to i:!~.s o~r;n:n proi:1:.i::ti:::::i e:3pach·.. lly d .;.r-i~g t}1e 1'11nt9r :~.i::.c.-:.1>.:, Oxy,g,~r.n in .9. b.lrn ie ~;:;:~·.s:1:--..:~d. 1:-:1. th:-~,~ pr·:.::.d.;,al ·r.r::\:.:a~ (1} bi,f1 fi.3h~;., a~d ot:-1~:- ~.r_l_'~:-i!.t.::.r.' . .,J ~;'') (~>"\ 1,,-, a,1 .... ""I-'-,~ ·'-! a~ ,,.. • "l "' -·'---..i.• '"'; '-'..J .i,·•-'-'•~1..,,;1 1.,·.1."',_, U.~-3 t\,3 ..-f-3.l 1 1 �a~ lib$rat0 o:::y~B~~ and m.'ittor., So The::... c, cuat bo eufTiei~:c.t volt~.-m.~ oi" ·:'T-!'.t•a:-- -'.;o hold the n~oaB!Jary oxyg:an S-..lpply through ths 11 l1rtcr., 7o '?h.-;,r-a i~ no doubt tb\-t Car·? ,iill s.~in m11.~~-3 ·a:ri~rc.n,,:, into ·the L~o 0 but B:iss ahou ld aid t:!.3 a c·.n:.trol of tJ~o ~:-~·,£) pro-:rid:!.ng tha B~n o~n get n g~od startc 80 Tit9 ovar populti"t::ion or ·chs C=1z·p in Thur~ton L-ake w~3 du~ to the unr~strio·ced entra:.10-~ or -thor~3 r iah by way or tha •irrlgation canals of the a.rea.0 9~ The Arka.~3a3 Riv~rs an1 tr.a syatem of irrigation 0a~sl9 of this area era tee~ing with Carp and oth~r rough fi~heso lOo A single fal'!'.ale carp sp~11f:l.a .?:-om 500p0JO to 2 p000g000 eggs and their dav3lop~ant is rapido 11~ Carp ar~ prolifiog they cnn endu~a enremes or tompsratures, and will suz-v-lvs out or w~t~r for long p~rlcda of tiri1eo 120 Onoa e~tablished, th~ carp ia extremely difficult to eA•·eraine.teo 13= Th!) U59 or Darris, hmv~-ver~ hs.a prov-~d to be a ~~ry 0£:f'ectiv~ m~thod or ~rradicating th~sa ti0ho I lr. T!l~ equipment uoad iu this oper,,.·ticn cona1:zt,a,d of on~ l&\rgs {to=;n an) rubber r~.fts, ~o amall rubber r=3.f-te 9 a nu~~r of out=boa.rd :u,otor bo~tis II ho s;ri.a.11 Ofjnt.r1f•..~gal ~~olino pump.e 9 :and si:x hand apray :pu;np~o TI1~-:·l! W3ra tH,7eral large barrels and tub:s luad for :mL"'ting and tramiport of' dr.9rriB solut"lon 9 also a numbar of buokets ~er~ usedo 2c Tha ::iethod ue~d in puttini~ th:9 d~r.is po1:1d~r into Thuraton l.$.ki!) b de21crib°"d aa follc·:.rs3 ao A 1:1b:iri.g sta:l;ion wa~ 3et 1~p on tha ~outh aho::·$ of tha Le.ka end opsrat~d by -c"?fo mamb!:r·ra of -cha :C9partmento Esra tha De:rri~ ~~'l !!lb::icd with u.!cs -w~t~? into a. th:!.ok gravyli~a gcJ.uti,-::u -:rhin:1 ~·,.;1 'chi~ad by ·thg bo=.it oparator9 be= f'or:3 t~pplLn.tion to the -;r9.·ca::-3 of thi:, La!..--ao b~ A larg9 ( t~n r::s~) ?u~t-e:- rnft ?:~& u11ed to ~pply ths derria to t:rn d-e~pe:.::- p-~;_<:,] or t:13 7J:c:loi:, '!ha rr.tYth~d on:pl'l'J!!d lun•.,_:; z::;,:; J_;::,. :~:~i.~-_? 2. ~1-~:,. ~ii . ·.~1-1 -c~~-.~ ~-- :•.:'.~t 1-:':·0:-1 :·;v~--...~:.11 to no~t~:, ~h~n ~070 r.\. ,~.~:...~.:~ ~2:J .[~: -~;_: i-:J~- . .)~·:. ~~;..;.::;-~~ -?~:J ..;-_-~·_;::; ;; r.,.ncl. !:..:~~,.-:, :1 :-~_"ln f:;J·:l ~::.:J ?10:~t~ to th.;1 ZOU:~!~ e:L.,i i:'!:) ~n :..:.,;,:cil t'h~) l:}~1"~~::r~ L!..1~::3 ';fll13 Ch::i.a !'1.' t·1··;-.> ~:.'~:1.11 o··:~YG.d.-:.':.1g:.~l pu.~.p:!! ·:-:-~~:J ,.~J.J::!. in thla i·aft;o It:~ ;-,u..::·~ lor1 ho3 ·:! ..:m.;:; p .! h~.t-J :J. t:1in no1trc5-on r:: J~ CT:~1.~~1 :J; ~(;:"'·.•~; .: :!16 t .:; ·t '::j-- ,_1 ~ 1 ~;~1 ~1 t: l)>.~'. t:.~' },_ ::,:~. :,' j By thi3 ~~;1-'c:tl•:>·~. a lar;;::i ur~a of' th.:: r.:ur-t::,.~; "l.-:~..,_:_:t1~'."' -~•i·.:;.:: ·.aa:ii.ly coYD:-o-3.:) Th~ cc-:r0r,;:3Q.:1 1 ratt tt~.3 n'..l:":'~~9~ T!i.':1.~T:~rl 1 ~ by ·b~10 !::o:J:b Y. !..~ cf th-~ !J-Jps::-tt{;dnt and e. or 1:iEs.r Sp.:,;.,-t-;-;-:-::;··~o �Oo Tir:o ~r4.l1,lh1r- ru~ba~,· r0.!'·t, (!'cur :,,'i!ft::1) ,rora uaad to d•s:-ria tha Bh~llow~1e., On.'3 b!.>z-.t c::l.l"':t·ied a s-:n3.ll oe:>.trifugc.1 p'1ntp !'lnd th.a cr'Gh~:r carr!.$d dry d·sr:d~ which was miied in tha bo~t ~~r-rylne tho ;~..irri.po ~11fo uti.it waa h.nuled E1'b·:iut t.h-9 165 a.er-a 11::., by t-rro. m~rr.h~z-~ of th~ 0-tlpat't.a:ant o..rd ~!$r:r_,rei. 1:::.:i:'.:lr Sr,orts~::1110 This er•:":¥ took turm1. in mi~ing and Dpr~ying tha d~rriB~ do Th~ D!>:part1~~~t fm·ni::had o ix h~xtd sprt\y pu:"ilpS whiah ;1ere eq\-1 ipp3d r1i-'ch fi va E;r:!.l loz:: tr:-:n}.:~ o T'h~T.a weTa uaad to Bpray th~ 3ha1lc~ areas whic:-i couldnllt b:3 :c-l'.achsd by the boat cra-:rso Th~e~ si~ hafid unitil war3 operated by rneni>ers of the La:nar Sports~~n Clubo 8:> fo I 3~ A :rru:i:'.bsr of the n:en:b:~res of tha Lt.?:1.3.r Sportsw9?l Club had out=boa:·d ;::a-tor boa ta e.;id these were u-tilh~d in two ways o lo Some of th3 boatg ran from north to south on the lak9 ,rita ons msn opgra,~ir.e ths t1otor and the other pouring darria aolution into the propeller traah which .mixed tha darris into th6 wat~r thorcughlyo 2o Other boats wa~e u,ed a~ transports to supply the large raft and ether boats ".Ti th the gra--;y.ali!c~ solution of u.t,rri3o A p~tt3~n wsa wov&n by th~ oro3sing and re=oro~~ing of path~ of tha l~rg-, rubber raft cr..d tI~e outbt;l.ard motor boats~ the oompleta p~ttsrn how~?sr dependij en the am~ll rubbar rafta and hand epray er~~ ·r.o tnka cnre of the 13hallow80 Thi.! rnsthod prov~d to baa v~ry 3U~os~aful -;ray to make f'ull coverage of th~ water are~o It b thought that this is the l.e.r g~.st lruce aur.faoe uea that thia Dsparbent, or any ether ~uoh a 6anoy8 h~; attempt9d to U!~ d~rri!! UpOilo Th-, D~pl\rt~e~t h8.9 ue~d dsrrla lTi th 8"...lOCa!!&I in eradioatir..g tra3h f iih fro:n e~.el 1 panda of fem surfac1' a.ore~" (Rsfer ·cc: USE O? DERRIS ROOT nr TERE3 Sfr.ALL L!HESJ Colo., State C,3r:-,-e and Fish Dar:rt., Bulletin 3-2D by R. R~ Rasa and Vf .. D., ~ain)o 4c Th~ D~p~rt-csnt: ,;--ri ~'h&J to c;q,r,:,iHJ i ttJ !:.ppr~oiati•jl:l to Mro Roy E¢;:des and Uro Ch;;l?•l,~s ~3r:.dall 8 "iT~O g~-..,-a ~uch of their time and of:."ort f.,r th~ n1.·,cc·~oo of thb projact and a.ho ·to the La.~ Sp-Jl6t~m:9n r,-.:r t>;~ir sp::a::d.id cooperaJ;iono 5~ The D,p½1:':"tm,9nt o~◄ ,y:r ~~:cb=1:.'"i3 -rr::,r';l> Ee'3,'1 0 :K!.:;:ln., S!)ru:..~~~ Rob.:n-t2. 0 L~r.t. Jh p and T:;. .-.:c:,-,·r::r., ~ �STATE COLORADO DATE September~IB11. Title of Project: 2. Supervisor: Investigation of the Ponds at Fort Lyon, Colorado Gilbert N. Hunter 3. Investigator: T.M. Lynch 4. Introduction: An investigation was made at ~he Fort Lyon Ponds to determine whether or not these ponds could support fish life, and the number and species of fish that could be stocked. 5. Summary: 1. The East Pond at Fort Lyon is the only pond which could be considered for successful stocking of fish. 2. The pond on the West Farm flucuates in water level to such an extent that it would be inadvisable to try to maintain any type of fish life. 3. The pond to the South of the grounds is so close to the river tha~Jis washed out by flood waters almost every year. 4. The East Pond has a n ~ ~ f about three acres. s. This pond is all shoal area, however only about one fourth of the pond is easily accessible for fishing. 6. There is no way to drain the pond, the water in the pond comes from seepage. The level is constant throughout the year. There is no apparent outlet. I 7. The temperature at the surface\AiJ.s. 78° C. The pH was 8.4 ~- The present fish population consists of: a. Carp, of which there are not too many~ b. Catfish, which are large but fewv c. Sunfish, which are abundant but are in fairly good balance with regard to size. 1 ~. A recreational program has been set up by the hospital authorities wherein the patients are allowed to go fishing on two days per week throughout the months of May to September. 10. The patients consider these fishing trips a great privilege. 11. The hospital authorities feel that this program of fishing helps them a great deal to restore the patients to normalij;y. �-2- 6. Recommendations: 1. The East Pond at Fort Lyon is capable of supporting more fish life than it contains at the present time. 2. Since the patients get so much joy out of catching the sunfish and the catfish, these fish would be advisable for stocking, however a control fish such as the bass should also be stocked in order to maintain a natural balance. 3. The present carp population is not large enough to presen~ the proglem of doing away wi~h them. 4. The Pond is fertile ehough to support fifty to one hundred bass and a mixture of sunfish and catfish to proportion. ~~ 5. If possible removal of part of the cattaiis and bullrushes around the shore would make accessibility for fishing the Pond much easier. 7. Discussion: 1. The hospital authorities 0.re very much interested in doing all that they can to further better fishing conditions for the benifit of the patients,therefore it should be possible for the Department to cooperate with them in every way. �--------------- STATE - COLORADO DATE Sept. 17 • WoTo ?, 1947 Io Tit1e or Pr.ojeo-t,, FiBh 'l'rt1.pping and T uing Opero.tionm at Antero Re1srvolr • ?all, 19470 Jl. Superviaor; III. Investigator-1 w. R. S~a.•n IV. Introduction: A 4'x ••• mt•l. "V" g&t~-t~pe fish trap and weir were Gilbert N. 1.bnter, Garn:, and Pish Manager Ray Ho Ilea$, Chier Fiaheriea Biologist inst~ll d on ;he, So·.-th !?orl:; of' J;he P .mt~ Platte Riv9r approximately 2~0 yardc nboYO .Antero Reaervo1r. Ths 1netallationwaa mde on Sept. 17, l94'i'. '!'he proj•ot -~a11 undertaken H a continuation ot a portable •~ir a~d 1uoke? trap;ing operation made in the same area in the apring ot 19470 Vo 'l Sumiar.y, l. 4~ • t2·out wore os.pturc,d during the woir operation. 2o 408 ot tho t:·out W-!~e ·tagxed e.nd rsloaaed.o !o 220 o~ the tagcl!':i ".;rou:; r,~r~ trC:;.Jloplanted to Cottomrood Lake in Thoai:t t'h11 aTe:ragt,d lS inch~• in longth and conisistcd ol1 td'ly of sp&.."ffl$d out b1•ook trout. Chat'fee County 4o or th11 -trout oapturf!ld• 370 rmr o b:-~ok troat (S1.lvelinu!I tontint1lia), 4-0 ,,..ore Loch Lt.'lvttn trout ( Sttlm'J t1. utta fa.'!'io) and 2 w~re rainbow trout ( Salll!O ga1.rdnerii). 60 Wooden ala.t ...tne .'tai:-s are quito ef.:'eoti~ if' proper y inetalledo '/. Waaboute. in.propei:· 11'8ir con11tru.:,t1..i>n. tmtl late inate.llation aoooun·tod tor 3 loSlB of uppro:id.matdy 6W. or the spawning runo VIo Roool!I.Wndatione. l. It is thcugh:t by tht'> opa1·11.tor tl-..c,.t the 1rdr t7U installed too late . 1n the, aeecono St;ptc>mba."' l r.11:ght riot be amiH a.a a st11rting do.t~ tor the we::.r opc.r.2tiono A ditrl;inl')t upi.:.wning run doH not ooour at Antoroo Ro.ther it i11 ll gi•~dua.l a11d spot·~y up1tror1m .nigrationo 2o Saine net w~:!.rm are impraot'-.oal :.11 a ,troa..111 populated with m.iakratJ or one oont2.:lning 1u1 a.pprecie.b lei 11.r.10unt or dobrics. 5o Wooden bar 'lliOlrii ar~ oftioi.,u.t :t..t' fi'.'!"ml.y anohored and pegged seouroly into tho b:?.n};s ot C!l~oh ohor~o r.t sh.cut,s occur around the weir rather than undern6~th it. Sand bags should be used behind the weir slats i t • ehirt.ing gr.gvel bottom is present or highwator is enoounterod. �������M!rR JIii l 1I lo ifit'l• et h o - • lb ·tM#) d - ~ a too V ~ ~ . Gilboft ~'io Ja,ntfiJr lo ~-• lo lwcaligo.et,,, t •· ij• ~ 49 ~tiOht - o Ao i'. !toN)1. ~ ! a t .tui- \ho D. 9. loll Qcme~tlott ~ n~at8d the ~ • o ~ration !ft m i ~ tho ~ e f f Pvnd e1al'fmble ~er ~ tlmb proa.u.tlaia b»' Pefflj~ tlio ~Riatt \.Uk tbb uibh leni.Go &. a.t~• l. ~ ,~,.,., a,. lM1l thie l~t;dW ~ - 4 Q J4ttd _ , ~ , 'ffl. &IlBltol' re,~~~ tillal e n u ~ ~ n mtlde re,:, tba uao ct Danis ia ~,e ~ e !\id. 1•. ~ a'.$.~~ 14., lM7 t:llu lfiVQSt-1$~ o~~ tt,ru c:Q m. Vo~,. •a~. tol~ ~ t ~ ~,~~ 8o ~T. ·w~rlultff ~« ~9$1 a l6't~ ft:a t. he #oaaal h4h .»t4 w;UCl• late ~ ~~~ tmi, tale 810,Wt i'&Cb ft~'flr-~ vault O'ffi:tr0 an ~~ s-a. 1941'. . ie 1r. - ~ uanteu .4Ut• ~QB. 00 rwa~ ~ ·,OU _. ~ t.uh.o 59 '1t~ ~ f£ch ~~- · . ~ to be MIA 111 a 411Gb \11\ttl the ·pomt ~ V.U mitelo t,op t'h&mo lo ~. rl~te tel1l t·~~t 15 oet.tU»•t ~ ~ - th@n ,tcw mGre ~ On@~ ~ ~ e , GD ffo-gter.•ol' 241, lfl.4·7 ~ •ci,'ff 4lay ot ee~f»t ~ ~ et ~ s voe ,at tnto ti-a· i ~ ~ Ve 9o ~- Vond h&I a ~ 1 mwfue ANli ot M ~ . · h ~ . 1t bml beoa ffnlffi'l4 4e1m0 t..o t.llitllt> s ~ • aoreo vi.~ en 6'ff-NiG deptk of I U41d. e. or ,~ ™' ~ tenths ,tt a rdltG sift~. 'i$Jl,14.h ftttl ti~ W. wa~. '1'illG al.Go t t ~ tho s·l~t; lo ~ t ~-- ~ -4 ~W. ut be ~ood in 1-ta e~tlr.oty• 1to ftlthwl <ff&$.~ ate•~. Qpa~!oa.wao ~ . fleh.\teS'!l to chow ~ q of tlt;Q ~ 11. tru. 11~1~ wu ai.1rJ11"teed ilit t~• ~wet fteh. foufflii to he ~ ad8". l~ f\'DS ~ ~Dl?f OWl Y~ old. Mio Whtie no ~let& oaq.nt. of tiah vaa t,OOllri!t!G• &iEt to dl'AR b&c, the . , ~ ~ 1 \t»e~ t!la pa,4. 1t 1B ~~imatd tbuJit G&Tl0R1 ~ ot W6Sh t£tm ~ •~'bed ~ tbe ~ �1.... oa of f lc !"o ~e Cyprtd~ { ! n'tra.roM.(1 ly. l • l oe 1.tlt. l~. Co ,r!o• • :OU 1. ti~¼ , i®f'f " , :):al.iu.1:ed o'flt ) tamU.y ~ Cat~~~ ( e •ck r) tar;Uy wta )Trlnodontldu 0:illl"" {• i1 • o tteb ...,,.r-y 1. l ~tl... r~tb t ,..th t.lmd o vor • yt uch flc't: ill ·o p! t b l• .;::nmi ,mt•r lo,.~1 tw \Tn'f•ht.,0 t~ • a • . too 0'ij .. .trvi&4t1o. O" mtb ~f.1':i.ly. :tc .. "~t icmltJ ne~v~l ~\ .,., •h • t 1.n'l wt . , of ~ 'e r ,hi roe ,.at t- fro th.1• J;p!'l • ,··tve tl~1t rt: r tl.: . ~rri .,.'At~ f'hh , ~r.r.. doil au '4•.wd tn , ,1.8 tio . '..r. . t:0 ti?, ~r~r.t Ul • rto-ot h • b$l'l4 t<J:.., �i • • i. l ��,. I STAT"'. Colorado ________ _______ DATE Io Title or Pr-ojeots ...;.. 1947 Ootob11r 2·1" The uso of dier!"i3 at Rogl!!ri, Lalcep Wdsenburg11 Coloradoo IIo Supervisor; Gilbert No Hunter IIIa Inve11tigators To ,n. Lynch IVo Introduotions Mro Jc M. •'olla.th ro·-3uei.tod th-, aid of tho Dep&rtment tn ridding Rogor:i L· '-;:, or trash fisho Derril wa1 reoo...1msnded e.nd \~sr,d en thei L&ke October 14 11 1947 o Vo Summary& L, Rogers Lake is a pr:l.va.to la1:o. ownod b;r Jo Mo 2~Uathp ~nager of the Epr.niah Pea.Jes Trout ,~omp&.nj<> 3o The Lako baa a normal fftt~r lov~l o~ about si;::l:;y om-t&~e aorea 0 it ii a numbar o:cs irrigat.:.on 11to.-age reoel"voli'o 2/s feet d?ep at the 4o The w~tor level waa lero5 eurtaoe aor~a 0 l tirno the dorria wu1 ueedc. 60 The temporaturi, ::in Ootob~r 14~ 1947 w11.s 64 deg:.·ot10 F., and the pH wae 806<:1 60 Thia Lake hnl'I rm t.nru:ma.l e~ount o ~ orgnnio nnttt;r b.Jth in the H-r-ing and dooaying !! tngeao 7o 2., 1 poundn of de:rrj.r.r \hich in 0quo.l to l aore in this Lakeo 80 The derris traa mb:t<Jd iuto o. tl:in l\olution r.Hh le.l:o water11 it ,raa poured into t;ho Lue by hand dul'i.r,g a . very heavy rains tormo 90 A' ,out five hours aftor the job "':<!f: etarted thefleh bagm to sh01f' arfeote of the dsrriao 100 Sp'1oies of f ioh i"ou:-!d -co be prGat,:i.-t W'3TO n::embers of Cyprinidae (~innow) familyp oarp boing tne l~rgect member and in the majority in numbsrtso A rer, members of the Catoatomidae (euoker) fr.m:Uy t,nd the Centro.rohide.e (sunfioh) family '\'rare .round to b" present alaoo ll,, A few daya after the derriG was u.H,d at the I.rue~, a number of ~ilh were obaervsd to be still alive0 120 It le therefore eatima'ced thct the kill we.a not mre than 86%0 l~o popomo was used per This Lake ehcmed no ov~r population whe.tsoaver~ and all the fish were of largo eizeo �VIo Reoommendation1 lo Since th~ kill vms but 8~ poroant, 'Y.ro Mc!fa.th feels that he will try to drdn the Lake ontirelyo If the I.alee can be drained entirely i t will prove to be e. very va.luable auet for t'ut ure U80o VII o Di~oueaion s lo The reaaonl!I why 85 psi-cont was the highest kill m,.de at the Lake could be beoa.u~es ao bo o., the low tomporature of 64 dsgr.ees Fo the high orgo.ntc content of the L~lcs the method usod !.n puttJ.ng the d errb into the Lake 2,, Viat1'r of law tempc,r&:cure has more ozygem." this would prolong t he affgote of the derris on tho tieho 3o The hi~li organio oontent of. the I.ako w1u, not known bef'ore hand and not enough derria wne applied to take osro of thia faotorc 4o The method used ln putting the derris into the Lake was very poor~ Tho aurtaoe ~:~e ff&S not covered r~et enough nor wall enoughc ?he job WAil 5.t1t~ll'rupted e<Hernl times due to heavy rai no 60 'f he f'ish erradioc.ted r~t this T.~ra were of lare;e she; nome of the oarp were 12 to 23 inohM in langth0 welghing up to 16 poundso Five blu~gil:ls were found afte?" the uee or derriss t hey weighed from J../2 to l pl'.>und eaoha A number of largo auokers were alno foundo �,/._,(.-·:,", c ....,_;,1 I. Title: The Use or the Shocking Device in the Lower· Arkan:saa Valley II. Date: November 13 0 19!7 III. Supervisor: ""-V .~I-J /i__~.; - l o ( - ~ Ray H. Hess, Chier Fisheries Biologist IV. Investigators: ·R.·M. Andrews and T. M. Lynch V. Introduction: Loeal sportsmen headed by Warden C. W. Clifton of Lamar requested the aid ot the Department in determining the amount or channel catfish present in the Arkansas River or that area. · VI. Summary, 1. During the.summer of 1947 numerous reports ·of channel catfish catches were recorded by Warden C. W. Clifton and the sportsreen of the area felt that since there were so many fish of this type in the river they might be able to transfer a number or these fish to other water areas in"order ta bring.better fishing conditions to the Lamar.region. / 2. The· investigation Into' the. pos~·ibie utiliz;._tion of these fish for that. purpose was made by_members of the LB.l119.r Sportsmen group, T. M.- Lynch. and W. F~ .. Gisel or the Yfray Hatchery under the direction or·R. M. Andrews Fish Distribution on November 12 and 13, 1947. or ,. 3. ••'I. a • · Equipment used in the operations consisted of a small seine and an electric shocking device. 4. The- :shocking device ~as used in such a way that by placing the. two electrodes in the water, the current passing through the water from pole to pole might touch a fish. This.would stun the fish and bring him to the-surface for identification or possible capture. 5. The list of fish taken is as follows: a.., "Eight ch~el c.atfish (Ictalurus lacustris p1.1nctatus) up to 12 inches were taken with t~e seina on Nove~ber 12, 1947. On November 13, 1947 four chan:lel catfish of approx:blately the same size were forced to ~~e surface by the shocking de~i~P~ b. Cyprinidae (Minnows) 1. Carp (Cyprinus carpio) numerous 2. Common Shinner (Notropis sp.) ~umerous 3o. Blackhead 1linno-w (Pimephales sp.) 7 fish c. Cyprinodontidae (Killifishes) 1. Zebra Top }!innow (Plancterus Kansae) numerous 1illlillif~ BDOW027873 , _·. ~•ti> •. ·.- ·:--~~-.'? (~~; �d. e. Cent~arehidae (Sunfish) 1. Green sunfish (Lepomis sp.) few 2. Pumpkinseed (Lepomis· sp.} rare Catostomidae (St.lcker) W'estern white sucker~ numerous 1. 6. Two different species of exotic fish vtere also taken during the operations. 1. Gizzard Shad (Dorosona cepadianum). from 6 to 12 inches. Numerous. These fish ranged 2. One member of the Catostomidae family was taken which· apparently has no previous record or being found in wat9rs of this state. (Carpiodes sp.) VII. Discussions 1. It is apparent that channel catfish or the Lower A:-lrJI.:1~a.c River consists of ~ strictly migratory population. ~b..ts E" ~-~:.r· plan is again f'ormlated for removal of' these fish to other wat-e:r areas• it must be put into effect when the migra·:-;ory wave is at its peak.· • / 2. ·Another value or this operation was the discovery of the two exotic fish species-. �_______ STATE- - ~ .COLORADO ..;._ Fisheries Roacarch Progi-asa Report ~ lfove!llber., 1947 1. Titler 2. Supervito~: I. GilbRrt N. Hunter., Gama a~d Fish ?~n~ger Ray H. P.oaes., Chief Fish~riea Biologiat North Fork or South Platte Projoot l. A tall inventory was made on & total of 1.7 mile• or the Worth Fork., repr$S&nting areas in the iower, middle and upper portiona of the atudy sootiono These areaa were double-oheokedo {All legal trout were tagged on the first · run and• eeooX1d run made to compare the number of thea• tagged ti1h again1t new legal trout c~ptured, developing an etfioienoy figure to be appli~d to the first run.) 2. Approximately 1} miloa of trlbutariec were worked to dill• cover any hatohery planted fieh which might have migrated the,reo 3o Inventory ehowed a population or 795 legal Looha and 1,0 legal Ralnbowc per mile in the North Forko ar.ainat a epring oount or 617 legal Lochs and 127 lGgal Rainba,r1. • 4. Although leu thf1ll halt or the h,tohery pb.nt•d fish were oaught during the fishing •~L10n 0 fc,w of these fish remined in the mtudy aeotion. Further study is Deed•d to di100"Nr wha.t happcna to these planted~butcnot~oaught legal trouto 5o A !'ull rt9port on the first year of thill project is now in prep11ration. II. Warm Wat11r Program lo Inv&atigations r.ero ma.de to further a program or improvement for liolbr~ok Roae~voir near LaJuntao Separate reports will be msde on these in·n111tig•.tiona. 2. Thuraton P.oeervoir, north of Lama~i was stooked with large mouth Baas fingerlinga and Bluegill fingorlinga. A olose oheok will be kept on the growth or these fi1h. III. Weir Operations l. &t Antaro Reaervoir in South Park and at Shadow Mountain Reservoir at Grand I.eke wore oloeed beoauee of aevero ioe conditionao Reports on tht,st> projeots are now being prep&l:<,do Weir ■ �IV. Mi ■ cellanecus l. V. The tollcming peraonuel a1dod in tho operation or oheok stations at Ho.xtun, La.nuu· and Sterlinc during the reoent pb~aeant season: R.H. Bess, w. D. Klein, R. w. Lehti, T. Mo Lynch, C. Ao Weberg and P.A. BarrOWD, Personnel lo Full t:\.me, R. H. Beu Wo Do Klein Ro W. Lehti W. Ro Seaman T. M. Lynoh c. A. Weberg 2. Part time: P. A. Barrows RespeotfUlly submitted, ~~#~ Chief Fisherie• Liologiat �t' . I , i...:. { -~~~ "1") (p . I. Title:· Results or Shocking Fish -in the Lower Big Thompson River II. December 2-3, 1947 III. Supervisors IVs Investiptor: • W. D. Klein, Fisheries Biologist V: Introduction: Ray~. Hess, Chier Fisheries Biologist Shocki~i,;~~ ·conducted on the lower trout ~aters of.the Big Thompson River on the 2nd.and 3rd of December to obtain information on fish .populations·: found. there. Also, an attempt was made to shock farther ¥P _the· river. where trout were- stocked last summer • . ' ·- - . . . . . - .. . .. . . , ": The work·~; ~ocomplished bY.. the-following Department. perso~el: . Wayne Seaman, :Robert Lahti, C. A. Weberg~·.- P. ·.T. Barr·ows and w.~: D. •• Klein.. VI. · ·· - - .. - ••• :.'~ • •.:·· ·· :.• ··; .,;. : .: _. . . . • ' Summary: • •• •• ~ .·1 ... : .... ,.... ; • • •,. ·.... .--~....... -• • - .. . '. • ... "' • • •. · : - ·- ,J• •• 1 . .-T~~~~ ~~re found in the Big Thompson .River as far down as one· mile above _Loveland; . . .. ':: . •: •. . . . . .:-:: ;--... ;- ·;, • t_·._:.. .. . , .•. Both Loch ·teven -. trout ·and· Rainbow were. found in the lower sectioi;is s~oc~ed·; the Lochs predominated. -•• 2. • ,I'.. • . ... 3. Most of .the·-trout. ~ere found in :the large deep -holes having good .cover.·'.:.-.This was. particularly .true in the lower_ , . sections. . .· .: ~- _.:,.': . ~ ! ;'. .. : ~· :. ~ . • ... • • • • 4~·· Several: larg~ -b--~~t. were- usually f'oiind·· in· each hole . shocked in .the lo~er·. sections. • • .~ • ·"· •• :··.'.: s.· It is .likely.that ~ny.trout are lost.down the irrigation ditches between Loveland and· the Dam·Store on· the··Big ~~-~~~son. 6. Tro~t were numer~•~: i.!i· a short.: stretch of stream shocked several hundre<;l_ yards below the dam at .the _Dam' Store. . ~ ·. .-.. 7. No ·i.nf'ormation could be obtained by_shocking in the stream above the Dani S~ore because of too inuch water-~ice and too deep holes. a. There was a heavy population of suckers and Cyprinids in the lower sections shocked and this population gradually lessened. with the exception of Catastomua catastomus griseus, as the shocking progressed upatream. In the lower sections C. commersonii sucklii predominated and_in the_upper ..£· ;:..• griseus was most common. 1i11~roo1irn1m~ BDOW027870 ~nm,..~«e.xo:JeeM\'!iltJ.f,~.!CSi..Hi1T!EM!ll,tM ~ lli'l:lffilO«!~)H,kPM<.1._,J.lfJffl«t .• t!I. l.mkfiW.C.!£ .MCWJli.~ifXW"IUU1JGi¥.iJllli!&\,kJWJ,EtfiS!MQSJ.44iii.tiUli:.!fO."ffl..(,t-tllWUlli&&- �- 2 VII. Procedure:._ ?io at.tempt was made to obtain e. complete census of the fish population. in the stream but rather to determine the lO'West point trout could be found. species of trout present and a gener~l idea or the trout and rough fish populationa a~ various points along the stre~.. . . • . . ··Shocking was not done· continuou_sly from the lower section upward but- instead#. a short ~action was shocked at:. various intervals.along the stream to give a representative sample or an area extending several miles up and down from the point shocked •. • It soon became ·apparent, ·particularly in the lower_sections, that the trout and the majority of-the rough fish seemed to favor the _deeper,. more well protect~d holes . .:. .. :· • ·'_ ' . •••.•. ••. > •• However,:. -~- .order to check ·t~r-- r~~e;{~n~-.-t~~~~ and possibly some spee·ies- or· rough f'ish that might not prefer _the deeper water, a short stretch of riffle and shallow.water wa~ included.in the sections shocked. .. I • • .-. • - -~ ·, .. It· should not be concluded that no trout. could be found below the· lowest po.int in which they were located by shocking, but it is felt _that_ in mos.t cases this point was accurate within two 1:11lles. ...... . ·. ~r ,.-.··· . : No· ·attempt was m~d~ to-· keep a -r~~~~d th.a numbers or rough fish found since, in the lower sections p~rticularly~_they were so numerous as to make keeping such a record very time consuming . . ., .. . v1n; Inves_tigation:. Shocking was started.on the·Big Thompson a short·dist~nce be:ow Loveland . . The water was polluted at this roint and no trout coulc be found. However, suckers (C~ c. suckliiJ and Cyprinids we~e numerous. . Also, several ·small •crappie _were .found. • •In a 300 foo~ section, about one mile above Loveland trout and numerous sucker!3 (c. c. sucklii) were·found. ·There were 9 Lochs ranging in size from-10 to.-15 inches and one 1s· inch rainbow. Also, one small ring perch, one catfish, a small-crappie and numerous cyprinids were recovered. The next section shocked was five miles below the Dam Store· or roughly two miles above the last section shocked. This section covered about; of a mile and included several good holes. The number and species of rough fish were similar to those found in the previous section. Seven Rainbow were recovered ranging in size from 4 to 12 inches and 4 Lochs from 10 to 16 inches in length. �- 3 - A section b~law the dam located at the mouth of the Big Thompson canyon was shocked. ~This section covered 600 r~et or stream starting about 400 yards below the dam and extending upstream. Ice-hampered shocking in-this·aection and probably many more small trout were present than were accounted for in this area.: Fi.fty·lega.l Rainbows were recovered a.nd seven under six inches. in length. The average size or the Rainbows was eight inches and the largest recovered 14 inches. Only one Loohwas recovered •. Suckers. were-,numerous ~ 102 being accounted £'or. The large majority or these suckers were.£·.£· griseus . .·No. trout have· been· stocked below the dam at· the mouth of the canyon-for many year.a •. This.means that the existing trout population below the da~ is dependent on natural propagation and-migration of fish down:over the dam. If the downward migra. tion.-is heavy~- there is _undoubtedly a substantial loss or trout in the large irrigation·ditches~-several or which remove practically all the:water from .the. river channel. This situation may ...warrant study i?>.· future_..years. • ·. •. :: , ~: .. .. . . . ... r. •. •.. .:. . ; . """' ~ .' I ·:\ •; ·~·!'?i ~ ~ ~~ ·;.; ~ ~~~-:: ~~ i:r::.,__ ~ .:·.t!-.:~ ·.: ~-~ ~.i. :~--- -:_ ~- : :;; ~ ~ l.: :--- ~: ~,, •_ . . :~ ~:- =:- :1 .: ·"':(~. f ~ t {~ :---~: ~·::.:•:;.,~ ~:: :!..r: i :-: 6 :·:~c~1 t .:-~\C·C:.··. y:. :· -~ ~= c- .._. 3 r,,•. • --, ,.. --~ ··.: ~ '? :-; ~- -, :-:·~; <?,·~ ..:" :..:: •; ~;;;:~~r.t'_-;·~r:.. - :::\:: h:::.t~-;.·t;f·~·i ~-~f.;l~{:,~;;~~. ~·:· i.~·.: ~.-.;~-~-~ . ~::-:::f~ ~ :·!1 ::.. t..:~ r·:--~~~:~~~·_; i::.•· 1: - �1 -· I ., Io Title: :..2., ;.:_.,·: -...:· ' Results of Shocking Fish. on }Torth Fork of the Caol1e La Poudre River Below Seaman Reservoir Deeember 4, 1947 II. Date: III. Supervisor: Ray·H. Hess, Chief Fisheries Biologist '1'1. Investigator: W. D. Klein, Fisheries Biologist V. Intrcduction; To gain information on the fish population in the str~a.m below Seaman Reservoir and to check tor marked fish planted in t~e Reservoir last summer, sections of th:e North Fork of the Pou~~e from i~s confluence with the Poudre River to Seaman Reservoir were shocked. The shocking was done by·the ·following Departm~nt personnel: Wayne Seaman., .Robert Lehti~ C. A. Weberg, P. T. Barr,:iws az:c". W. D. Klein •. VI: Summary: _ 1. .A very heavy concentration of Loch .Leven trout· was found in a 350 yard. section below Seaman Reservoir. ·. 2. These trout averaged s·.4 •inches in length. 3. Seven: td~bs ~e~e recovered. from a· marked.. plant (both ventral-fins removed)·ot 2,000 three inch fingerlings made in Seaman Reservoir on .July,:· 1, 1947. These recoveries were all made in a. 350 yard. section -_j.mmedia.tely below the ~eservoir. 4. The plant of fingerlings made in Seaman Reservoir on July 1st grew approximately 4 inches from~ate of planting until December 4, 19~7 ;: a period. slightly longer than 5 months, This is unusually good growth. Fin regeneration was noted in f'ive or the seven marked S. fish recovered.but in no instance was regeneration complete in either fin. • 6. In~ 400 toot section of· the North Fork at the Greeley w.~terworks bridge 75 trout were recovered by shocking. or these, 39 w~re Loehs averaging a½ inches in length and 36 were .Rainbow averaging 7½ inches. 7. Sixty one :,uckers, (Catastomus cata~to1t1.1s gria~us),, ?1ere found in th~ above section. 8. A considerable number of the fi.ngerlings planted in Seaman Re~ervoir last summer moved ov9r the spillway and into the stream below~ 1ilOO~ilillOOi BDOW027871 .• --- :'..;,_ i-? { Y) �'--,I VII. Recommendations: lo Sea.man Reservoir be opened to fishing in 1948. 2o Stocking of fingerling Lochs be continued in 1948. VIII. Discussion: Shocking belo?t Seaman Reservoir proved to be especially valuable because some marked fish were recovered from the plant of three inch fingerlings made in the reservoir on July 1, 1947. While only seven marked fish were recovered, this was sufficient, coupled with the large number of Lochs of a comparable size group recovered in the same area, to ascertain-that a substantial number or the fingerlings planted last summer passed over the spillway . • This is the second instance in this state {the other being Shadow Yountain Reservoir) that marked or tagged fis~ have been recovered below the reservoir in which they were planted. Knowl-. edge on movement of fish from the reservoirs is or value in determining stocking policies in reservoirs. However, much more work will ha~e to be done before any conclusions on this matter can be drawn. It is reasonable to presu:ine that a movement or trout out or. the reservoirs via the spillways, as e.t Seaman and Shadow Mountain Reservoirs, could be a contributing factor to the poor fishing in soma ot our reservoirs at the present time; This subject is complicated by many.different types of reservoir outlets and their positions in relation to the surface of the lake. The only possible 'Way for the·fish to have escaped from Seaman Reservoir downstream· was by the spillway near the dam. Less than 150 c.r .a. ot water was going over this spillway ~uring the summer and not more than 10 c.f.a. at the time of shocking. The seven marked fish recovered-averaged seven inches in length and ranged from 6 to 8 inches.: This represented about four inches or. growth. in the five month period from time of plallting until recovery .. It would appear that most or this growth was made in Seaman Reservoir during-July~ August and September. It would not be likely that much growth could have been made in the stream below the reservoir~ especially considering the heayY population of trout found there while shocking. In addition to the seven marked fish, 364 Loch Levan trout were recovered in the 350 yard section of str~am inur~diately below the resar7oir~ Thes~ trout averaged 6.4 inches in length and only 23 were above or belaw a five through eight inoh size grou~. On July ls~ approximately 50,000 Loch fingerlings averaging about 22 inches in �.. 3 - length were planted in Seaman ReserToir. Thie stocking included the 2,000 marked fi~rlings previously mentioned .. The marked tish averaged about three inches in length. Judging from size and the recovery or marked fish, ·1t seems logical that the major- ity of the Lochs found in the section below the reservoir and falling in the 5 to 8 inch size group were from the above· plant made in the reservoir. One native and three Rainbow were recovered in the section belOW'.the reservoir. It is estimated that only about 60% of the trout present in the 350 yards below the reservoir were recovered by shocking. There was some regeneration or fins among the m~rked flsh Only two showed ?lo ·sign of t'in reganeratfon. ' !le trout were marked by removing both ventral fins.· Tr..s finE were removed when the trout were 3 inches in length and when this ama.11 it is difficult to clip the tins close enough to tha bod~. Howe~r,r, of each of the fish recovered showing acme tin regcnerg,·tion, ,me .r::~ showed no regeneration and the. other only partial regeneration. .. • recovered. 11 • A 400 foot area starting at the Greeley Water Works bridge over the Borth Fork of the Poudre and extending upstream was shocked. This section gave a. count ot.39 Loohs,.36 Rainbow trout and 61 suckers. The suckers observed were Catastomus catastoms giaeus. • The Rainbows averaged 7½ inches in length and the Lochs 82 inches. The largest Loch was 12 inches and the largest Rainbow 9 inehea •. All but four of the- total ·number or trout (75) were 6 inches or over in length. ' The trout were found mainly· in the deeper·holes. The recovery or shocked fish.was estimated at so%· in this section. -• • The North Fork .or the. Poudre in·the vicinity or the above section is very heavily fished but. as has been found in other heavily tbhed streams~ a considerable population of trout remains:· at the end of the fishing season. • Seaman Reservoir was closed to fishing in 1947 by the G8lne and Fish Department because it was felt that fishermen would catch mostly unders ize trO\lt •. ·• The present: size •of the. trout indicates that it would be advisable to open the Reservoir to fishing at the begilmi?!g of the 1948 .fishing season. Enough growth can be expected during the winter in the reservoir to bring the average aize of last summers plant to over seven inches. · •• Sinc9 natural reproduction last fall would be limited to only a few resident Lochs in the reservoir and atr8am above, it is recommended that a heavy planting of Loch fingerlings b9 made in 1948. -~.Rt&&JtSAQJJIM.iUR.Yml.G-&t!mtMZEJSJ&WWW!QhW.f&i!ii!.{dl.R§;gjful;l3g;.rn.:WM3ii!#lr~i%£~,~:;w.ft~'.llm~,.4J~,,.,__JJl_vJ9.WP~¼E4MfmiK.i;!;ffiAP'.H@M«l · �Title• ·. Results ot Sl\ocking Fiah in the Lower CacheLa Pouare River II. De.te: December 4-5, 1947 IIIo Supervisor: Ray H. Hess, Chief Fisheries Biologist IV. Investigator:· W. ·D. Klein.,· Fish Biologist V. Introduction: Shocking was conducted on the lower trout waters or the Cache La Poudre River on the 4th and 5th or December to obtain inf'orma.tion on· fish populations. Also, an attempt was. :made to shock farther up-the river _where trout ~ere stocked last summer. • The work was accomplished by the following Department personnel: Wayne Seaman, Robert Lehti,, C. A. Weberg, P. T. Barrows- and W. D. ··nein~ .••• ~· ·• · ·· · VI. Summary·: · •. · ··~:· , 1; Trout were found in the Poudre River within ¼mi.le or the Fort. Collins city limits~ ...... .,_ ....... ··, :·,: .. ,. • :··".·· • 2. ··Both Loch Leven trout and Rainbow were recovered in the .-/, lower sections shocked; the Lochs predominated. . r,,. : .: . • • • ··• • ~• ... • :., . ... : ... •. • - ~ •. • •. • 5 ~ •. • • Yost •or the· trout- were founa· in the• le.r ge deep holes having good cover. • • !" ~. ·: ••• •• •• 4. Several· large trout were usually found in each hole shocked in the lower-sections. 5. It· is ··likely that many trout are lost down the irrigation ditches· between the mouth or the Poudre Canyon and Fort Collins. • ' ·,. ! ' ' ..' : •• ~ •• - ,,. 6. Depth- of water, volume·of water and ice made it impossible to obtain inf'orma.tion of value by shocking above the mouth of the Poudre Canyon. • • ·,: • ' 7. There was a heavy population of suckers and Cyprinids in the lower sections shock9d and this population gradually lessened., with tha exception of Catastomus • catastomus •• griseus., as the shocking progressed upstre~m. In the lower sections C. commersonii _sucklii predominated and. in the upper ·-2.!_ ~ griseu~. VIL Procedure: No attempt was made to obtain a complete census of the fiah population in tha stream but rather t.o determine the lowest point trout could be found., species of trout present and a general idea 1iiifllllllfii BDOW027872 �or the trout and rough fish populations at various pointa along the stream.. Shocking was tiot done continuously from the lower section upward but instead., a short section was shocked at yarious intervals along the stream to give a repre!entative sample of an area extending s~veral miles up and dawn from the point shocked. It soon became apparent,, particularly in the lower· sections., that the trout and the majority of the rough fish seemed to favor the deeper !f•• more well pro.tected ~ole~. However, in order to che.ck £or fingerling trout and possibly some species of rough fish that might not prefer·the deeper water, a short stretch of riffle and shallow water wa~ included in the sections shocked. It should not be concluded that no trout could be found.below the lowest point .. in which they were located by shocking, but i t is felt that in. most cases· this point w~~_.aoeurate-within two· miles • . .·, . .. ... .·,. ...~ • . No attemptt·was made to keep a record of the numbers or rough fish f'o1,1nd since, in the lower sections. particularly, "-they~viere so numerou;B a~ . to make keeping such a _r.ecord- -very time consuming •. . ·: . . :. : '... •·- . ·:. :.. - " .. • • -~ ,.. VIII. Investigations· . :: . • - • • ' _ !°•_• . -.:· . ,._ ·..· ~ • The lowest. point shocked wa's about ¼~i.le~ :~~ov~- the Shield Street bridge •. Jfo. deep accessible hole with good cover could be located in.the immediate vicinity but shocking the riffles and relatively sha~low w~ter resulted in some trout being recovered. In a 400 foot section four rainbow were obtained averaging 5 inches • in :length and two 5 inch Lochs. At the Bellvue•. br.idge 38 trout ;,ere ~-re~overed-.. in- a· 900· feet of stream •• Of these trout· ·only two Lochs were under" 6 inches in length~ Twenty-eight·of·the trout were Lochs averaging 10 inches with the largest'measuring·16.inches. The remaining ten trout were Rainbow averaging nine·inches. The largest Rainbow recovered ·was 13 inches in length. - . .. Seven small ring perch were obtained in this.section. 4 .... . ·, The Laramie County Sand Trap Ditch was shocked·at the ditch intake. Two 8 inoh·Rainbow and 3 Lochs averaging 10 inches were recovered •. An attempt wa3 made to shock in the vicinity of tha u. S. Forest Service Boundary but_with a f~ e~ceptione, the holes were :UI.IDD S otl»U:t~IIMJV.ll!.l?ffllml:t!ffltldit!i.M IMJLil!Jl!SihiM!'!!l':W!!l!Ji!i €. MmDl:..44/ wmnsm.~~QRliffllfi',<;...t\fUl~'™N'Sii..<m!Ii'l£t Alt ¼MW\l'.:f?!~}.;:mm:re,~141;J.1£,M,CfJJJJJ..O,¢i!Mi!:6£&!:J.9.P. �- 3 - too deep or iced over and the riffles were the only type.water that could be shocked. A 1,000 foot section of riffle and one hole wa~ shocked. Most of the sixty trout recovered were found in the hole; &4 were Lochs and 36 Rainbowr·.., Suckers.. (£ . .2.· griseus) taken in t~e riffle numbered 239. ..., ·.. • • The question of ·.how many trout move downstream and h~ _many of tpese trout go down the ditches is·· inlportant·· on the Poudre. • • • - _,,- ...., : • • -~-I;. .. . ·!.;~:i:_ ·--. •. .. ..,._ • _ �1' Titles II. Date1 Progress Report, Borth Fork ot the South Platte Multiple Purpo$e.Project, 1947 December 6, 1947 Gilbert N. Hmter, Game e.nd Fish llanager Ray ii, nesR, Ch:i.ef Fisheries Bioiogist III. Supervisors: IV. Investigators: W. Klein, :a. Wo V-lh'ld, Wayne Seaman and Clarance Weberg of the Fisheries Research statt, members of the Warden f'orce and .temporary employees. V. Introducti.oni D9 In lU1 etfort to further the growing list of information which will lead to improved management programs, including planting procedures., this project was set up to throw added light on the following questionsi 1.. Catoh A. What returns can be expected from plants or legal size trout? Does this differ by species? By time ~t plant? B. For what length of time oan a plant of legal size trout be expected to contribute -materially to ·the catch? Does this differ by species? O, Wbat percent of legal resident trout are cautht in one seQ.son? Does this differ by species? (The term resident 11 used here to denote any fish which was not stocked durliig the current year, 1947.) D. I~ a heavily fished stream ot moderate size, what contribution to catoh oan be expected from resident fish? Is one • species of trout better adapted aa a resident fish to this water and fishing pressure? E. What becomes of legal size trout which are planted but do not enter the fisherman's creel? ?., IU.gration A. What movement oan be expected from plants ot legal size trout? Does this differ by. species? By time of plant? Does movement or resident trout dlfter from that ot hatohery reared stock? • !Jwnber ot hatchery fish required A.. What num'ber·s and species of legal size· trout would: be required per mile to create good tishiag (average catoh per man. hour ot 1.0 or· above) in this or comparable waters? \ 1ii1liiffliiiliW~ BDOW027874 �- 2 B. What numbers and species of legal size trout would be required to create good fishing throughout the state? 4. Effects of post-plant closure to fishing A. Does a period of closure to fishing following each plant of legal size trout prevent the high takeout immediately following the plant? B. Does suoh a closure_ by necessary publicity and advertising, materially increase the fishing pressure? Each of the above main headings will be dealt with separately in the following material. It is realized that results given here cannot be taken as definite answers to these questions. They are limited in their application as they represent the findings of a single year on a single stream section. Cons1dered as such, they will lend appropriate weight to the final answers. It is planned to continue this project to determine spring pre-plant populations, 2nd year returns from hatchery plants and, by progressively increased numbers of stocked fish, to determine if there is a point beyond which it is impractical to go in numbers planted in a stream of this type. Inasmuch as considerable work is to continue on this project, this material can be considered only as a progress report on its first year of operation. VI, Procedure A 14-mile section of the North Fork of the South Platte river, from its confluence with the South Platte upstream to the bridge at White Pines in the village of Pine, was selected as an average trout stream. It contains pools of normal size and grade, normal fish food production, areas of slow and swift water and a flow during the bulk of the fishing season of from 100 to 200 second feet. An inventory of resident fish was made during April of 1947, using an electric shocker, with some 840 legal size resident trout tagged and logged as to species, size and place of tagging. The entire area open to public fishing, 10 of the 14 miles contained in the section, was divided into tenths of miles by means of white stakes, each numbered in black to denote the tenths of miles above the confluence. Posters were placed throughout the section, advising fishermen of the survey area and asking their cooperation. �- :5 Department members were maintained on the section during the entire season to contact all fishermen possible. The number varied from one man during slack times to as many as eight men during times of heavy fishing pressure. Legal size Rainbows and Lochs, including 500 tagged fish of each species for each plant, were stocked in April, June and August. All tagged fish were logged as to species, date of plant and place of plant. A post-season inventory of rema1n1ng fish was made during November, 1947. Legal size trout were tagged and logged during this operation. VII. Results 1. Catch A, ~ returns ~ ~ expected trout ? £.!:2! plants 2,! legal ~ Of 3,000 legal size trout tagged and planted i n this test section, 1,099 were recovered from creels for a r eturn of 36.63%. This must be regarded as a minimum figure , since some fishermen were missed during the heavy influx of fishermen on holidays. Some six access roads and considerable movement by fishermen made 100% contacts impossible. A number of those missed, however, mailed tags in to the Denver office. Does this differ & species? Rainbows and Lochs were tagged and planted under identical conditions. Of the Rainbows, i3-60% were recovered as against 29.66% of the Lochs, indicating a much higher recovery of Rainbows during the first year of such plants. ~ ~ differ Er time 2.£. plant? Returns were best from Rainbows of the latest plant and from Lochs of the earliest plant. Returns are indicated below: April 15 plant .... . ....• Rainbows 42.o%.....•.. Lochs 42.8% June 28 plant •........• Rainbows 39.6%.......• Lochs 17.4% August 20 plant •... . •... Rainbows 49.2%........ Lochs 28.8% Should these figures hold up under further investigation, early plants of Lochs followed by later plants of Rainbows might prove good management practice. �B, .!:!!!, ~-°length.!!_ i~ can.!. pl~!!, legal.!!!!, trout E.! expeot~ !2, oonti·ibutematerially ~ the catch? f>oes ~ fil.~ & apeoias? Plants ot legal si·ze trout contribute materially to the o_atch for a period ot approximately six weeks in a stream • ot this type. Table below indicates the percent ot eaoh species recovered, byweeks_of fishing after plant. 100% is based on the total recovery ot each species by plant. R represents Rainbows and L 1oohs. These figures ·are acoumulative. Week April Plant· R 1...... ,i% L 63,C 61,C 66% 72" 73% 84% R 1s,g 46,C .L 42" August Plant R L 36" 66" 36% 61,C Average R 42~ L 4°" 63% 59,C Resident R L 39% 22,C 17 •. •,. 99% 3~ 24~ 77% 71% 52,C 31% 84% 78,S 55% 4°" 89% 82,C 81" 46" 93% 90% ~5" 59% 96" 94% 66%- 6s,C 97% 96% 1<$ '12" 73,C 74r/, 98% 96% 82,C 79,C 99% 97% 99% 98% 87% 8°" 9S% 99% 91% 86" 99% 99% 91" 92% 95% 96,C 99% 99% 99% 99% 1~ 97% 99~ 1~ 99'C loo,( 99% 18 •••.• 100% 100% 2 •••••• 7~%. 3 •..•.• 84% 4 ••••.• 86,C 6 •....• 87% 6 ••.... 91%. 7 •••.•• 94% e....•. 94% 87-% 90% 9 •••••. 96%,. 91% '~ -June Plant 10 ••..• 97% 93% 11 ..... 97% 94% 12 ••••• 98,C • .se% 13 ••••• 99% · 99% 14 •••.• 99" 99% 16 ••••• 99% . 99%· 16 •••.. 99% 100% • 657' 55,C '13" 82% 82" 81% 86% 89% 91,C 9'1% 98% 99% 88% 92% 94,C 98% 98% 93% 96% 99% 98% 99% 100% 99% 100% 98,C 98% 100% 74,C 82% 88% 93% 98% 98" 100% From these figures it would appea:- that plants each tour weeks during the fishing season would be necessary to maintain good fishing·in a st~eam_of this tYJ)e,· as-approximately 80% of thEJ stocked f'.ish wlµ.ch were caught. had been r_emoved by this time. Approximately 90% had been· removed by the sixth week, after_. whioh time the plant no longer contributed materially to the catch. Little difference was exhib~ted between Rainbows and Lochs used in this investigation, although the catoh ot Lochs did appear to be spread over a _slightly longer period ot time. Percentages ot resident Rainbows and Lochs, tagged in early April, are included ·1n the •bove table:for oomparison purposes. As might be expected, _cato~ of the bulk of these fish was spread over a.considerably longer period than was true at hatchery fish. �- 5 C. ~ percent of legal resident trout are caught during~ season? Of 595 legal resident trout tagged prior to the season opening, in areas open to public fishing, 123 were recovered, representing 21%. This nust also be considered as a minimum figure, as indicated in A above. Does ~ differ by species? Of 50 tagged resident Rainbows, 32.0% was recovered, against 19.63% of 545 tagged resident Lochs. While the number of Rainbows was insufficient for an accurate figure, these percentages indicate a considerably smaller percent of legal resident Lochs are caught in one season. D. In a heavily fished stream of moderate size, what contribution to catch ~ be expected from resident ~ ? Resident trout in this section of stream provided a catch per man hour of .209, compared with .315 provided by stocked trout. While .209 may not at first glance seem to be a great contribution, it gains considerable weight in the light of the 23,076 fishing hours spent on the section (2,308 per mile). In fact, had the usual number of fishermen used the area, resident fish alone might have produced a higher catch per man hour than both resident and hatchery fish produced under excessive pressure. Even on a heavily fished stream of this type, the contribution of resident fish is considerable. ~ ~ species 2.£. trout better adapted ~ ~ resident fish to ~ water ~ fishing pressure? Loch Leven trout seem better able to maintain themselves through natural reproduction and to furnish more fish for the creel from resident stock than other species of trout, in this particular stream section. Resident Lochs provided a catch per man hour of .139, while Rainbows contributed .070. The catch of Brooks and Natives was ne gligible. Both pre-season and post-season inventories showed a preponderance of Lochs over other species of trout, making up 81% of the spring count and 84% of the fall count. However, this by no means can be taken as an indication that Lochs are the preferable resident fish for all trout streams. �- 6 - Inventory figures are given below in number per mile, Spring count Lochs over 611 •••••••• 617 Lochs under 611 ••••••• 201 Rainbows over 611 • • • • • 127 Rainbows under 611 • • • • 92 Suckers.. . . . . . . . . . . . . 311 Fall count 793 146 148 106 251 Shiners............ . . 5 7 The numbers of small trout and shiners can be taken only as a trend, since it was possible to capture only a relatively small portion of these fish. Figures on legal size trout should be reasonably accurate as the method used was to work a section, tagging all legal trout captured, then to re-check the same area tabulating the number of tagged fish encountered against the number of untagged legal size trout found, This yielded an efficiency figure (47.05%) to be applied to the first run. A total of 1.7 miles in four sections was worked in this manner. Further evidence of a smaller percent of legal size Lochs reaching the creel is indicated by an average of only 27% sub-legal fish of this species encountered, as against 42% sub-legal Rainbows. Le gal size trout present at the end of the fishing season totaled 941 per mile of stream, or one for each 5.6 linear feet. Catostomus cornmersonii sucklii and C. c. griseus were the species of sucker found in this section, while the shiner was Rhinichthys cataractae ocella, E. What becomes of legal size trout which ~ planted ~ do not enter the fisherman's creel? Only one phase of this question can be answered at the present time: They are not in the stream section where planted. Of legal size trout tagged and liberated in the survey area, 43.6% of the Rainbows and 29.7% of the Lochs were found in creels. The fall inventory indicated only 5.3% of the Rainbows and 9,9% of the Lochs remained in the study area. Thus 51.1% of the Rainbows and 60.4% of the Lochs are unaccounted for. The question of what happens to more than half of hatchery planted trout of legal size is believed to be of such importance as to warrant considerable investigation, even though it may necessitate construction of weirs and traps at the lower and upper ends of the study section. �- 7 - Resident legal trout showed somewhat similar figures, although larger percentages remained in the section. In one section of .6 miles which was checked during the spring inventory and double checked during the fall, 33% of the Rainbows had been caught and 36% remained, leaving 31% unaccounted for. 15% of the Lochs had been caught and 25% remained, leaving 60% unaccounted for. 2. Migration A. What movement ~ be expected ~ plants of legal ~ trout? Does this differ by species? Movement by hatchery reared legal size trout seems to vary considera½ly by individual trout and to differ somewhat between Rainbows and Lochs. However, the question of movement cannot be fully answered until it is known what happens to fish which are not caught and which seem to have disappeared from the section where planted. The following material is based on 1,099 tagged Rainbows and Lochs which were checked in fishermen's creels. Lochs exhibited a greater average movement e.nd a greater tendency to move upstream, as shown in the folbwing table. Rainbows Lochs %caught less than .1 mile from place of plant .......... 27.0 20.0 %caught more than .1 mile upstream. ...... .......... . . . . 41.3 62. l %caught more than .1 mile downstream .......... . ........ 31.7 17.9 Average movement in miles upstream................... ... .75 1 .. 17 Average movement in miles downstream.................... .55 .84 %caught within .5 mile of place of plant ..... . .. , ...... 80.7 60.4 %caught within l.0 mile of place of plant.............. 88.4 77.5 %caught more than 5,0 miles from place of plant........ 1.4 1.7 10.1 Greatest individual upst ream movemer.t, miles .. . ... . . . . . . 7. 2 6,7 Greatest individual downstream movement, miles.......... 6.9 From these fi~res it would appear that plants should not be made less than t mile from sections of stream where public fishing is not allowed or that are inaccessible, and plants at least one mile from such sections would be preferable. However, as indicated above, this is based on f ish recovered and . could change materially when movement of all fish is accounted for. The accompanying graph demonstrates visually the movement of Rainbows and Lochs checked during this study, �.... 1~ .J-1 - ....., ,_ u •• ' -' ~· 'l. ~ .: eu c, n ~ :.;',. / I -; ,,, II l '.: ~ " ,._, ,_ 6 ,_ I , ,_ "J. u "' . ' .. I ,--.... ' I •◄ 1 1 - ~ &ILL ., " 'I ..- ;:i - • .. - .. • V ~ ,: • D J l ~ 1 - J I,. I . ~ • ■ "... L . ... - I . . IL " .,- ,, - • .J ;'! :, ._ I.I oU .. ,. !'.I ., C _; ~ 1 J llall I~ ,. ~ I I,' - 11 , i..i. - ,. I D - • IJ l a J " ,_ > I > ~ l • J I " ... J ). I 1, I- "-~ I ~ I I 1L g .. I ••I I N i _-, l,( ~ 'I ,. ~ .. I 11 ;t .-·. " - 1 ,,. ,_ J - , , I .,, ~ f' ' ,. \ "\. .... .. I lo.lo :, • .J - - ..."l IJ • D - .. . - I,,. J ,_ . •• lea 1 F ..- 1 ,- - ,. \ • .. -c -__ , l - • .. " ,., , , -' h l :' 1-- :1 - r: ;: l ' - I .._: .. - ' I , __ • L - I ►• I!: I .u - 'i :, - , • - ] ,, . /1 ... N' ,,_ Cl • I •"' •A '" -J • • '-/ ' / ' / \./ ' / '-/ . n ,c., .~- "l. J' I -.. . ,., ,_ :, • I ' I j 'i ... - -- I .. .. --. ,. �~ ~ differ b y ~ of plant? ~ resident -2!:. hatchery ~ ? Greater movement was found in the spring and fall plants (April and August) than in the summer plant (June 28). This was true of both the Rainbows and Lochs. In eac~ case a greater percentage of the June plant was caught at the place of plant and the average movement of those going upstream and downstream was less. Comparison of the movement of fish caught during the first, second and third month after being planted indicates that the greatest movement takes place during the first month. Rainbows were more stable in their new environment after the first month than were Lochs. Resident Lochs were more stable than hatchery reared members of the same species. However, individual movement by a few resident Lochs, as nruch as 12.l miles upstream and 15.8 miles downstream, brought their average movement up considerably. Insufficient numbers of Rainbows were checked to give reliable figures on the movement of resident fiwh of this species. Figures on which these statements are based are presented in the following table. M,vement is given in miles. Avg. :/I: Average Average Move- SubMovement Movement no % % movement upstream. downstream upstream downstream ment jects .as 170 .96 .so 29.4 50.0 20.6 April Rainbows 180 .. 51 .20 31. 7 .82 34.5 33.8 June Rainbows 216 . 54 .60 .65 39.4 36.l 24.5 August Rainbows 402 .62 .11 .47 32.0 41.2 1st month Rainbows 26 ..8 .68 130 .65 .70 36.2 37.7 2nd month Rainbows 26.l 29 .71 .85 .56 27.6 44.8 3rd month Rainbows 27 .6 180 1.22 1.05 1.38 16.9 65.0 18.9 April Lochs 80 .69 .89 .48 63.7 21.3 25.0 June Lochs .88 110 1.25 .51 21.6 64.9 13.5 August Loc-hs 228 .88 .65 1.11 57.4 21.1 21.5 1st month Lochs 86 .99 .10 1.27 9.4 76.7 13.9 2nd month Lochs 35 1.67 1.50 1.32 24.0 72.0 4 .. 0 3rd month Lochs 95 1.27 1.51 1.02 31.7 41.0 27.3 Resident Lochs % 3. Number of hatchery fish required. A. What numbers ~ species 2!.. legal size trout would be required .£!!:, ~ to create good fishing (average catch per ~ ~ .2£. l:£ .£!: above) ~~.£!:comparable waters? �- 10 - If both Rainbows and Lochs were used, in the same proportion as during 1947, 3,150 Rainbows and 1,340 Lochs would be required per mile. This would be a total of 4,490 legal fish or approximately 1,000 poumds per mile. 4,186 Rainbows alone or 6,154 Lochs alone would be needed per mile. During the 1947 fishing season, from May 25 through October 31, a total of 7,825 fishermen spent 23,076 man hours on the 10 miles of open water included in the study section. A total of 12,094 trout were caught for a catch per man hour of .524. Of this, resident fish contributed .209. Stocked trout, including 12,546 Rainbows and 5,338 Lochs, contributed .315. Provided the percent return remained the same, the deficit of .476 would require an additional 18,958 Rainbows and 8,066 Lochs. This would mean 3,150 Rainbows and 1,340 Lochs, or a total of 4,490 legal trout per mile. The needed poundage per mile would be in excess of 1,000. However, if fishing_ were improved to t.his extent , it is believed that fishing pressure would incre~s e greatly, necessitating stocking of a proportionately lar ger number of fish. If Rainbows alone were stocked, a total of 4,186 would be required per mile, as the return from t his species was greater by 47% than from Lochs. Lochs r.loue would require 6,154 per mile. These figures do not, however, take into consideration any holdover from one year to the next. B. What number ..2£. legal ~ trout would be required to create good fishing throughout~ state? It is realized that only very general figures could be given for this question, due to a host of variables, such as fishing intensity, success of natural reproduction, water conditions, returns from differi~g waters, etc. However, such figures should be valuable if t hey show within a considerable margin of error the total number of fish that might be required. Returns from the North Fork project, when applied on a state-wide basis to the 1946 fishing season, the last on which figures of fishing intensity e.nd catch records have been compiled, yield the following material: 13,410,945 legal size trout would have been required from rearing units to bring the catch per man hour to 1.0. This number would have been needed if stocking were in the ratio of seven Rainbows to each Loch, as were the actual plants of that year. At five fish to the pound (approximately 8 11 fish) this would total 2,682,189 pounds or 1,341 tons. �- 11 These figures were obtained in the following manner: Approximate fishing intensity and catch information obtained through the interview program and from warden reports indicate a total of 286,000 license holders spent 3,200,000 fishing days on trout waters and captured 12,600,000 fish for a catch per man hour of .716 (5-plus hours per man day). Had the ~atch per man hour been 1.0, 17,598,000 fish would have been caught , leaving a deficit of 4,998,000. With a ratio of seven Rainbows to one Loch, 4,373,250 Rainbows and 624,750 Lochs would have been needed. Since the return on Rainbows was 43.6% and on Lochs 29.66%, the plant requirements would have been 10,030,355 Rainbows and 2,106,370 Lochs. Adding the number of le gal size trout actually planted and appearing in the catch per man hour of .716 brings these numbers to 11,139,944 Rainbows and 2,271,001 Lochs, or a combined total of 13, 410,945. 4. Effects of post-plant closure A. Does~ closure to fishing following each plant of le gal size trout prevent the high takeout immediately follow ing~ plant? There seems to be little correlation between periods of closure and the initial catch of planted legal size trout. In fact, the highest first-week takeout occured after the longest closing time . The April plant was followed by a period of six weeks closed to fishing (the season opened May 25), the June plant by a one-week closure and the August plant was made the day before fishing was resumed. The table below shows the percent of catch during the first four weeks following each plant. Figures are accumulative. In each case 100% equals the total number caught during the fishing season, by plant and species, April plant Rainbows ..... Lochs . ....... June plant Rainbows ..... Lochs ... ..... August plant Rainbows ..... Lochs ........ 1st week 2nd week 3rd week 4th week 71% 53% 79% 61% 84% 66% 85% 72% 19% 42% 46% 55% 65% 73% 82% 81% 35% 36% 65% 61% 82% 74% 86% 82% B. Does such!:_ closure, .£r necessary publicity and advertising, increase the fishing pressure? �- 12 A detinite increase in tishiftg pressure was noted following periods of closure. Little publicity and no advertising acoompanied the April plant. While the opening ot the season would normally attract as large a number ot fishermen as during any other like peri'od or the season, the least number fished the study area at th_is time. The closure toilowing the·June plant was given ample pµblioity and the necessary newspaper·notioe or suoh closure. Coupled with a long 4th of July week-end, the greatest number ot fishermen were contacted during this period. Similar publi• city accompanied the closure in connection with the August plant, when the second-largest number of fishermen were oontaoted. Post-plant closures would seem inadvisable tor the to1-· lowing ~easons: (1) Such closures do not reduce the initial high takeout of planted legal size trout. (2) Necessary publicity and newspaper advertising attract large numbers ot fishermen to the ~rea. (3) Advertising, posting and addi• tional law enforcement require considerable expenditures ot department tunds and personnel time •. The table below gives the number ot tisherm~n contaoted on the·study section during the first four weeks following each plant. Figures are accumulative. 1st week lat plant ••••• 649 2nd plant ..•.• 1,576 3rd plant •...• 1,130 2nd week 835 2,118 1,800 3rd week 979 2,488 2,091 4th week 1,263 2,942 2,231 Respectfully submitted, _U' o.-y H _ ~-1_.t.;:vJ,,, Ray H. Hess, Chief Fisheries Biologist Note: Persons wishing to quote trom this abstract should first obtain permission from the State Game.and Fish Department. �Al~ f PP rJ')Q0035 ---- • { (} / -~~ · ·, 1 I. Title: Results or Shocking Fish in Lower Eear Creek II. Dates December a. 1947 III. Supervisor: 1.V. Investigator: W. D. ~lein, Fisheries Biologist v. Introduction: Ray H. Hess, Chief Fisheries Biologist Shocking was conducted on the lower trout waters of Bear Creek (Tributary-to- the· South Platte. near Denver) to obtain information on fish populations. The work was accomplished by the following Department personnel: Wayne Seaman, C. A. ·.Weberg, P.· T.- Barrows and W. n.- Klein. VI. Summary: l. Trout were found in Bear Creek within 300 yards of its confluence.with -the South ·Platte. River. -•. •·, · • . -2. 3. : : :. Rainbow predominated in the ·sections shocked. -- . Most of the trout were found in holes having good cover. 4. There was a heavy population or suckers and Cyprinids in the lower sections shocked and this population gradually lessened_ .with the .-exception of Ca.tastomus catastoms griseus, as the shocking progressed upstream. __ In_the lowe~_sections .£• commersonii suoklii :predominated and· -in the ~pper .S,• 2.• _Eiseus. ·•· ... · -• VII .. Procedure, .... · _, ....... , ... ..,,,_. • . • •. ~ . . ~ ~: ....... Ho attempt was made to obtain a complete census or the fish population in the · stream but rather to determine the :lowest point • trout could be round,. species or trout: present and a general idea. of the trout and rough fish populations·· at various points along the stream. ~ .. -: -~: . ~ · - •• · Shocking was not done continuously from the lower section upard but instead, a short section was shocked at-various intervals along the stream to give a representative sample of an area extending several miles up and down from the point shocked. It soon became apparent, particularly in the lower sectiotts, that the trout and the majority or the rough fish seemed to favor the deeper, more well protected hole~. �Hcwever, in ;order,-to oheck ter tingerling. trout. and pcuibly some species of' rough, fish that might not pref'er the deeper water, .. a short stretch of riffle and shallow water was ineluded in the •· sections shocked. It should not- be•-eoncluded that no trout could be found below the lowest point in which they were located by shocking., but it is felt that in most cases.this point was accurate within two miles. No attempt• was- made to keep a reoord ot the numbers ot rough fish found Binoe, in the lower sections particularly., they were so numerous as to make keeping such a record-very time consuming., VIII. Investigation: In a 600 foot section of stream starting just above the-confluence of Bear Creek with the South Platte five Rainbow were recovered . . The trout averaged 7 inches in length and:the largest. was 9 inches. The five trout were taken immediately below a · diversion dam that formed. an= upstream barrier. .The trout could ·; have come--either..-downJ3ear.~Creek or .up from the Platte-River.•. A section.-~two-.ndles above· the· confluence with·the South Platte was shocked but no trout. were:found.~. No.trout were recovered.in.a section shocked 4½ mile~ above the confluence with the Platte.,. No··trout were recovered--seven-miles above the·.confluence with the Platte. · • . The next section :sho~ked was- at :the Soda .Lake_ bridge crossing two miles below Morrison. -. Four_ trout-.were -recovered. in 600 fee"!: of stream. . All were Rainbow and the. largest-measured 12-inches and the smallest 4 inche~. . • • ._ In a 700 f~ot, section ¼mile below .the hogback 17 .. trout were recovered ... Of this number 3 were _·Lochs • and 14 Rainbow.- The. Rainbow averaged 9_ inches in length;• the largest .was -14 ·inches and the smallest four inches. The largest-Lochwas.14 inches and they averaged 13 inches. · . A 1,000 foot section starting a short distance above Morrison (opposite the CCC Camp) was the. last section shocked. Eighteen trout were recovered in this section 15 of which were Rainbow and , 3 Lochs. The Rainbows averaged 8 inches in length and the largest recovered was 14 inches. The Lochs ranged from 4 to 9 inches in length. Ice conditions made it impossible to shock higher up on Bear Creek. �r- ,..., # fJ()00C3D I' 1-n ~-) ' r-: l~c, I. Titlet ReB\llta of Shocking Fish in Lower Clea? Creek II. Dates December 9, 1947 III. Superviso~: IV. Investigator: v. Introduction: 1_,__ ... ,i .: ,. ·----~~ Ray H. Ress 0 Chief Fisheries Biologist W. D. Klein, Fisheries Biologist Shocking was conducted on lower Clear Cre,k (Tributary to the South Platte at Denver) to obtain information.of fish populations. The work was accomplished by the £ollowing Department personnel: R. H. Hess, Wayne Sea.man, Thomas Lynch,. C. A. Weberg, P. T. Barrows and W. D•. Klein. VI. Summary, 1. Clear. Creek was badly polluted by sewage and industrial wastes rrom its .confluence with the South Platte to the uppermost point ex~ned, just above_Golden• .• 2 •. - The only trout found was one Rainbow recovered just above Golden. 3;_ .Carp were vary numerous in ·sections shocked between the Washington -·street, bridge eros sing and the Federal Boulevard bridge crossing.• ~•-,.-_: . 4 -: • 4. There was a heavy population_or suckers and Cyprinids in the lower sections shocked and this population gradually lessened~ with the exception of Catastomus catastoms griseus, as the ·shooxing progressed upstream. In the lower seotions c. commersonii sucklii predominated and in the upper £• ,£• griseus was most common. VIIo Procedure: No attempt was made to obtain a complete census or the fish population in the stream but rather to determine the lowest point trout could be found, species of trout present and a general idea of the trout and rough fish populations at various points along the stream. Shocking was not done continuously from the lower section upward but instead, a short section was shocked at various intervals ·along the stream to give a representative sample or an area extending several miles up and down from the point shocked. It soon became apparent, particularly in the lower sections, that the trout and the majority of the rough fish saemed to favor the deeper, more well protected holes. 1iii~limililm~ BDOW027876 ~-trt,; �- 2 - However, in-ord~r to check for fingerling trout and possibly some species- or rough--tish that might. not prefer the deeper water, a short stretch of riffle and shallow water was ineluded in the seotions shocked. It should not be concluded that no trout could be found below the lowest point in which they were located by shocking, but it is felt.that. in most cases this point was accurate within two miles. No ~ttempt was ma:de to.keep a record of ~he numbers of rough fish found since, in the lower sections particularly, they were so numerous as to make keeping·such a record very time cons~ng. VIII. Investigation: Clear Creek was shocked at frequent intervals from the Washington street bridge crossing to a point just above Golden. In the lower two sections carp were large· and very numerous. ·They were not found above the Federal Boulevard road crossing. The pollution below Golden wa;· ~tficientt to discourage the survival,.- of. any. trout that might._drift into. that area. Pollution above Golden due•· to,· mine tailings was evident. However, one ten inch Rainbow-trout .in good condition was recovered in the section shocked above Golden. �I. STATE Colorado DATE December 9 1 1947 Title of Projects· Investigation or Narriquinnep Reservoir, Cortez, Colorado • II. Supervisor: Ray B. !fess, Chief Fisheries Biologist III. Investigators IV. Introduction: v. Swnmary: T. M. Lynch, Fisheriee Teohnician I A request was made by the Dqlores River· Rod and Oun Club ot the Department with regard to ridding Narrlquinnep Re89rvoir of.ring per~h. • 1. Narriquinnep Reservoir is a storage rese~voir ot the Jlontezwna Valley Irrigation Company about ten miles north ot C~rtez. Colorado. The normal water level ot the reservoir contains 400 surface acres. ~. It has had a varying career ot good and bad tiah~ng c~nditions tor many years. Trout were tried at one time with little success due to the tact that these fish would not spawn. Bass, bluegill, crappie, ring perch and oatt1sh seem to do wellJ how:ever~ indiscriminate stocking of these tish bas reduced the ~e in t_he past tew years to a very poor fishing.area. s. Recently the Reservoir was drained by the Irrigation Company in order tor them to ~e repairs to thejr dam. The fish.population ot the Lake was. rescued by members of the Dolores Rirer Rod and Gun Club under the direction· of Warden. o. W•. Gooaman. The resoued fish were taken to the Doiores River. • 4. The Reservoir has become over populated with ring peroh in the past tew years, and since the Lake was drained the ·c1ub members felt that . this would be an excellent .opportunity to get rid ot ~ne peroh permanently. • • 6* However the water left in the Lake consisted ~hietly ot seepage an.4 the few pools were apparently.very shallow~ The ,Irrigation Company ottioials said that they would not refill the R.eser~oir .until spring. Therefore, 11:lnter kill will undoubtedly eliminate.the remai!ling tia)... pa~'fli.GJb e. • Thousands or·ring perch were round in the outlet ditol;l but everyone was frozen. All holes within a .halt mile. area ,,ere seined, but showed no indication ot fish lite. • • �VI. Reoommandations, 1. Since Harriquinnep Reservoir is the only Lake with proximity to the Cortez area, its recreational value is highly regarded in this region, theretore aome ettort should be made to see that this Lake ia pro•. perly stocked with a good game fish population. a. The bass and bluegill ratio would probably be the best i'ish population to stook at this Lake. 3. Since the Lake will be. unoontaminated as tar as any f'iah .lii'e ia concerned, it should prove or some value to the department ·as· a study. project with regard to the bass and bl~egill ratio. VII. Diaouas ion a 1. Although trout will not spawn at the Lake, bass have· proved them- . selves oapable-ot survival at the Reservoir, tor·a number or years ago baas fishing at the Lake was•• regarded •as excellent-.- . Poor • management or the Lake brought-about its destNotionaa tar aa.tiah~ ing was concerned~ • 2. The Lake abounds =w_itn·natural food materia~s--needed by the fish •. �-·. l-<·' I.z. , . .....,' • I. Title: Results or Shoeking Fish in Lower Bouldor Creek II. Date: December 10, 1947 III. Supervisor: Ray H. Hess. Chief Fisheries Biologist IVo Investigator: W. D. Klein~ Fisheries Biologist V. Introduction: ~ . s~ocid.iif was .conduo~ea t?ii. the ~ewer. trout waters or Boulder CreeK (below Boulder; Colorado) oh Decemlier iOth to bbtain informa- tion on fish populations. 'hie woric was acc.ompiished by t];e toiimdng Department per~ somiei: R. H. Hess; Wayne Seaman. C. A. Weberg, Thomas Lynch, P. T. Barrows and W. D. Klein. v:t. summary: 1. Trout were recovered in Boulder Creek as far down aa Valmont. 2. Only Rainbows were tound in Boulder Creek from Valmont to the gol~ course at Boulder. _ 3. There was. a heavy population or suckers and Cyprinids in the lower-sections shocked and this population gradually lessened. with th& exception of Catastonus catastomus griseus, as the shocking progressed upstream. In the lower sections .£• commersonii·sucklii predominated and in the upper£• .2.• griseue. VII. Procedure: • - • No attempt was made to obtain a complete census or the fish population in the stream but rather to determine the lowest point trout could be found.,. species or trout present and a general idea or the trout and rough fish populations ~t various points along the stream. · :·_.. Shocking was not.done continuously from the lower section upward but instead, a short section was shocked at various intervals along the stream to give a representative sample or an area extending several miles up and down from the point shocked. It soQn became apparent., particularly in the lower sections, that the trout and the majority of the rough fish seemed to faYor the deeper. r.10re well protected holes .. 1illliliilll~ BDOW027877 �- 2 - gcmever, in order to check ~or fingerling treut and possibly some species of rough fish that ?night not prefer the deeper water. a short stretch of'.rif£1& and shallow water was included in the sections shocked.· It should not be concluded that no trout could be found below the lowest point in which they were located by shocking, but it is felt that in most cases this point was accurate within two miles. No attempt was made to keep·a ·record or the numbers of rough fish round since, in the lower sections particularly, they were. so numerous as to make keeping s·uch a record very ti.me consumiJ?-g• VIII. Investigation~ . In a 1,000 foot section of stream shocked at Valmont, 10 Rainbow trout·were recovered that ranged in size from 7· to·l4 inches in length. Also, one sunfish was found in this section • . . A 200 root· section ~as· shocked about 1½ miies above Valmont. The- stream at ·this point was carrying considerable refuse, pre.;. sumably from the _Boulder -sewage- disposal plant •. However.·eight Rainbow, trout· we~e· ~ecovered from- 7 to 14 inches in length.· f ;. :: •• ~ .. .. • ••• ' • .. •• ... ,·· ~.. .. · •• • • •• ':- 7' ... •.• ;"" ·.-. ~ • The last-~ection -shocked consisted.of 600 feet of stream starting about·400 feet below the golf course and extending upstream. Twenty-six Rainbows were· recovered ranging.in size from 5 to 15 inches •. ~. The. a:ver~ge· size was 7 inches •. ·.,· _ 'I' 4;._ �I . D lU 1n Introd.u~. ti on: To oont1!!1le the a~1.1dy or tieh poru:a~iono in Sb~daw M~u~tain Rea~rToir and Or:.nd Lak:, stnrti,d l r:t f H,, Q. , e:h- and tr",P wr.5 inmtf..lled on the North Fork of the Color~do Rivo~· im"'~d.i.&to).~ abovo Sh,.d01J Mountain Ld:eo 'l'hs trap wa1 op rr.t d by C.. Ao Web rG• ll'ieh Tocim~cian. It -m.1 hopad that in addition to ■ tudying the !'all apir.m.1.1\g trout popu.. l ti.on~ lug t:-oi,t e:itor ing the run could bo ro:novo1 to ot.ler at•r• and thu :-edur.• prodc.tioo lt" cor;i in thl': rourvoir o.nd hcalp to gdn e. maxbum proeuotion to tho fl hori:s::m by prv1Wtiug A la~g~r population of o~tohAbl~ but not ovorly large trm1t. ~' l.. Retultu of tho trcpping v~ro not et.tb!'moto••y tor 1ti";;her a good pop\,le.tic:n si.,1d:f Ok· romo·ral of' ltlr-~(3 trout .fi:·oin the lako., 2" R~le.tively terr tk'out \~i~ro tn'•on i.n 'the trapJ a tote.l ot 11 b..·ot:1ka nd 64 loch levon m~do up tht e~tch~ 3.. T"n'3 1·nn e:t nc'od tor covo~~al m!lth o.nd did r.ot re!l.ol, a not1c~ ble p,,uo .f.~ lfc.tf,lt· !'luotu t '.ona brc,1Jrf·t .,_'ocut in th ~ co~7oir by nooc~sary B-Jre u or Rool£:nntion !>-p rnt1.o:.ui r ~:pero.: &i· nt:y th. nt111.ro.ctoX'y op re\t~.on or the tl"apo 60 Tr-O'l\t soemod tc, opr.i:m pr'.ncipnlly in i;!1e , rco. b t:-i·oo.11 S'1e.dOtJ Uountni.n R "'c,rvoir nnd Gr nd Lnl, o h.11·0 1t wc.e nr.>t a.oomsrl ad'I'~ , hll,'l ta pln.a& e. trap 'booe.12-10 of the .fluott:iat~nr; lA.k'l 10,•ol 6. P.:·aotioc.lly no l'OJ i· Ja.-l;~ on cllll ba made b'lt,\;l),an ~h11 f:.nd l~at yearo rocults dum to tho d.1..ff'£1rit1r.t condltio::i~ o:it:illtine; in ,.rue,, lenlu nnd n-cer tluotua.tiona in tht;;i r n::...oir. e. A oont1!.d ..·e.bb i.• Ebe,r o! ·crr.n'~ r,: y r.a~ ro>J up the f.orth Fork 01.' th ColorQ.dO bttfor the trnp ;.• a iuot,.,llod. 10, '!'he r..~i-.igc o~.~ci ot ·l..he loch lcr-0u ·kout t~f.4ppcd we.11 15 inchaa, l!lnd 12 inohcl! for tho b1•()0k ·ta.·cu·bo l., All ti; a.pping be bmidor:au. on ?h£Ulw ' unte.:ln R~rnal"fOir and Grand Lak UI\til a po·~JT~e ·,t ltr.1 ·e 7. vel in. tl r -.,itvofr ic E:!stablinhea. by tae Bul·oQ.u ot :' ola s.t!.oi:.~ �Tho r.ci,iir· ir.nd ·c1•r,r ,,.o.;;i ii:io~;"!,Uo(5. or.i; So. 1-~r;'-t11fJr l<:!- und v~r-,,tod untll tile 8th et !fo·r-trinher.. Tl, Jwy by ~Ii..:· ?'ft)Ot~li,;tt o .:' in6 tr.ttp1r•:\ng nr~ :,roaented in tt.ble t"orm~ Tr..eire va~ not ou.t'f~oi,..,.,t '"<Ouid.snt,~l (H,O~p,:,mat -'co r.c1,011nt for eo few t!.15h bdl'lg trr.pt-'"d" Jhcr:.1.'.t tl Mln ~ Q:J d.igr.tl:y· he&:"°1nr immi-sd!.atel;r e.ft~r -tho we!ir ~'Pit'J instnH d thc.n ",c.t.or,, H ,,a.Iii 11ttG'.:in";~l ";:hn·:.: r.-.n l'lf·z roob.bb munbet· Gt !"bh JM.y h&.v3 z-un b~:f'o?·~ -~he tir0,p wa:21 1.n o:p.;r&·tion. Also 0 eohoolo of larga brom1 tt"cut 't'l'o:ro ofi;Qt}.l ,,:i0n 1:n the i~dfa.,.<:. ·.,-,01-.,ity of C!-11.nd LAke outlot and it 1s be~.i.ovl!>d a le.rga m.rn.ilH1r. or trou-t 11p:.w.··113d :tn thii, ru;--,a. En~ though Slul.dO':'f ~!:)ut:ta.i~ R~s-,rvoir .,,.ew pra.ctionlly full a.t the tinl9 tho voir YU install d r~ 101· nsrn·ly a. oon·ch th:iron.f-:;~r, thcr~ "-'U alffltYl!l l!IO!lll!J drop end oonmequsn·t;ly a o,u..t'"ont bot1J'~nn IHand La.ke and Shadow Uountaino In the t:.bova r1re1. tllc, 1r11·!;0~ WG.ro docp cm.d it wa0 d1f'fioult to obierv-e thei extent ot t po.mui,.~. CJbracrvQ.tiollB tr'8t'f.> nn.clo l'J.t l.i.c.t,:n"Vl'.lm in. th6 ]fort!l cmd EHt Inl<,t1 of Ch-and ::.,o.kct te dc,ts1."!"li11e ,xtent o~ opaun \ng th3:."'>" Only ~ fR trout. wore1 non 3pa\m:1ng in ·che ~ s·l;rlllYMo Thu Bi.!~e&u of P..oalw.ation lQY~~~d Sa~1;m V.ount~iu P.0r~1voir &boat ~lue t&~t during tiQo lc.ttor po.rt of No"m:!!l':;,:,r.•.. ~.:J.1:..i ::-eivl:.ed .l.11 ... l rg.> aroa. ot atr'!Ql'I\ b&lo-.:r -Gr&,nd Ln.1!::i Qnt1 brilow t}:'!l trs.p ~:1 -:.;hr !To·.· th Fo.i. k: b,dil.g !!l&d.® ava.Unble for l!pf'-1.mrl.nr;o R~..d1<'.ln.l ohunbcD ot 1..hiPJ -~yr") :l:•1 th~ l~~~ oond1::,;ioniJ and npar:ming bod U1't'UI 7D~€llil 1.!J.format·i.~.:l -r.'!>tai:nec flt tho ti·&l} of: llO "!if/.l"J.f) ir: a y :: to y~ar. tr-sttdo Allto 0 wbllr. :1,:te:: !'luot'lirz-3;:\onli in tltc rc3,r:·votr fll"e er.oou!'.rcci:"13d~ nany cf thc,:i:i. ot an uni"'O&'HOn nc.ture 0 it is :1.~om!Jl;::.c: ·i;-, 1:.,s·:..e,.:a e1. w1:h· in th.• noat ad7a.ntagioua 0 plllOGo Coli,-1.r!C"r lng tho 1Jo,.ocl"'t .:b1ty- 0:r obte-1.ni., z inf'ormLticn ot mlu1t undor preuo1:1t e10:ndition12 r. ·t: Sluubiw l&:in:«tl't l.n 1.!r,H,:· n.:1.l' it i.ti.pp,1u·s 1:ucs t. to i\ban.don 1111 tl."c.pp:lng thor:'.3 until such timl tu thtJ Bm·oc.'t: 'C.lt Pc'J'.R• '1.8.i;i'l~~ <i'ot1.'t:-lir.hc!'J the hlro lat"ttl pet·UJ!l1en·Hyo Onoa t!~~ .niter le·lf8l. i!l eata1--1iahs~ i r Snadw llountafo lmsorvoir, ~ont1·ol ot tho tall Apl!lln'i:tng fi.1h. by "tt•r,.:p:~:l.Y.1g 011~~ b,"'- 1uooeauf"t.:.11:, :iooomplii:•ied l.& ths tributaries to Grand JJ!'I..J;:e .;..nd Sho.rl07:" ~-..m·l;~~.:i cu·e reld;:•.v~ly ,r~ll J.n vul\U?O '-n ·the trAll ot the yae;r. W:'..th tho u,o of' !:. eho,~'.:b.g m1chin.) 21 Loch hVG~. B.lld 18 Bl!'nok trou·l. wore removed. trom. S!u.idw M,v1.1:Ga~n Ee:;,e~·..,•c,ii ~ ti;i.gg;o~. a;:;id ·br-&?.naplr.ntod to the C>;jle,r-adn RiTIDr 1n th~ Ql"'Oll i~d.l.<.1.tea).y lJO-lm"' t~ 0l"S ('17,.·•1y :10 A !•~ rGti1rn• from thb p!llt?t lJJ!J.Y be of 1.1.ic.t 1:n deoi.din11; on le,:mtionc t-£Jr .ru-cui'G ·i;Ji"'ii.ncphnting of thi.i typs, Th• trout a.v«sr11g;od 12 ,:i:\ohes i~ lc-:1~h~ Tho :tol).aw:l.nt ts.blH sh.r;mj,ni di;,y by d1.y opQt·<:t. 1;:l.cn of th.~ ·,rep are nl f., oxplanato1·y~ �WEATHER •., S'I'REA'.M CONDITIONS D L I - I ~to 1'1 Ol0u 18 Cloudy Q> No" No. -- tmoox TEm,o Aolfo TEMPo PoMo 1 2 450 6<P 6 3 48 60 60 6B 50 M 63 66 '8 Sfi .. --·- ----·1ocns Sbowara • - •ft- 19 Cloudy Shcmerg Stream high 10 Q 20 Frair - StrGPML loUtr«U' 21 Cba.r - ' 1 .. I 22 ClliltU• 2 28 Ol@ar ~ stTaam 2 J_49 1 60 lowGrin; !-S Clear- ....... ..._,, __. ',:;) - .l 25 Ooto I Cloudy I ·- 26 Rain~ Strong wind 27 _J -615 I II 6S ~ 48 61 64 Cloudy 61 49 28 Cloudy 6C 64 29 Cloudy 49 64 so Bsavy rain & wind l ,., 62 l Ol~ar 2 48 ~ O Rain 1 -·2 Cloudy 2 46 63 s Pmrtly oloudy 1 48 68 46 62 46 50 41. Clear JI. & Olear 1 8 - �-. _.. - '.ff~o :G'E WEATHER =- S'J.~M COBDITIO!JS 'to 6 Pt\rtly oloudy l 7 Partly oloudy 2 8 Cleu 2 9 Partly cloudy -· LOCHS TEMPu AoM'o TBHPo Poll, 2 ,20 418° 1 4A, 60 44 68 43 M t ·- i --· lioo • BROOK ..... -------- 1 Clear :n. 48 62 11 Cb~~r l 44 60 12 Ra.in° Str0am 1 43 62 2 43 68 48 46 42 45 10 I higher 13 Rain .. -d 14 Cloudy 2 - -~ 16 Partly cloudy - . 18 Clear 41 f6 17 Partly o loudy 40 48 Jl8 Partly cloudy 40 48 19 Clear 40 41 20 Partly cloudy 39 4.2 21 Clear 39 4A 22 Snow 36 .f.8 23 Partly oloudy 83 39 I I l 2 1 r t.l �. I I ,u.TE Octo 24 26 28 I I ~:---·- iiliiHER C: STREAM LOCH,S __.. _____., ..... OOilDI!lONS I ,_ Noo BROOK TBMP(I A..,M" TEMPo Po'Mo 36° 41° 32 36 38 88 34 37 83 38 33 88 32 38 l Cl.oar -rl Snw - I Cl@ar ?.1 Partly oloudy 28 Oleiar 29 Snow 1 - so . p;1' -OTo I Sn0u1 .... Io@ on 1 strQmm I l I ' I i 31 Partly olo':'dY l Clear r 2 l I I S4 - . S2 88 37 __ 2 --...lt-Pv_t_1y_0_1ou_dY _ _ _ _Tl_ _ _ _ _ I _ _ _ _-1t-i_ _s_"_ __,l_ _ zs_ _ I 38 3 Clear Cloudy O Snow ~-1 l I I I 33 I S2 36 6 Cloudy - Snow 88 38 s ClGa.r 32 86 '1 - Partly cloudy~ Ha&vy 1oe on 1Jtre&.m I I l I 32 I . ., 83 � https://cpw.cvlcollections.org/files/original/c351117b778a46519184eed7fb0cd2dd.pdf 6e6ae4e67e8513a3a133de38a044a1b8 PDF Text Text THE USE OF MARKED FISH IN COLORADO Ray H. Hess Supt. Research and Distribution INl'RODUCT ION t The use of marked fish in obtaining information which will lead to better management practices is in its initial stages in Colorado. The material presented in this paper covers efforts in this line for the years 1946 and 1947~ and is aimed as much at arousing discussion and stimulating the tranefer of ideas and methods as at presenting factual data. All marked fish were of various trout species, and information gathered was planned as nearly as possible to answer practical management questions. METHODS AND PROCEDURES: In 1947 an intensive study section was set up on the North Fork of the South Platte river, from its confluence with the South Platte upstream to the bridge at VTh.ite Pines in the village of Pine. This is considered an average trout stream, as it contains pools of normal size and grade, normal fish food production, areas of slow and swift water and a flow during the bulk of the fishing season of from 100 to 200 second feet. This stream is on the aastern slope in central Colorado, at an elevation of approximately 7,000 feet. An inven'"tory of resident fish was made during April of 1947, using an electric shocker, with some 840 legal size (6 inches or over) resident trout tagged and logged as to species, size, date, and place of tagging. The entire area open to public fishing, 10 of the 14 miles contained in the section, was divided into tenths of miles by means of white stakes, each numbered in black to denote the tenths of miles above the confluence. Posters were placed throughout the section, advising fishermen of the survey a,rea and asking their cooperation. Department members were maintained on the section during the entire season to contact all fishermen possible. The number varied from one man during slack times to as many as eight men during times of heavy fishing pressure. Legal size Rainbows and Lochs, including 500 tagged fish of each species for each plant, were stocked in April, June and August. All tagged fish were logged as to species, date o.f plant and place of plant. A post-season inventory of remaining fish was ma.de during, November, Legal size trout were tagged and logged during this operation. 1947. Approximately 16.000 additional legal size trout and 2,000 fingerling trout were marked and planted in 19 streams and 6 lakes throughout the state. Publicity was given by radio, newspapers and Department publications to the effect that all who mailed tags to the Denver office would have these tags returned as souvenirs, together with information as to the species, size, place of plant and date of plant. A card was developed, requiring 3¢ postage,. to which the flattened tags could be attached by use of scotch tape. �'i - 2 Publicity was made as nearly equal as possible in all sections, so that returns might be comparable. Many of the plants included both rainbow and loch leven trout, stocked under identical conditions for compa~~son purposes. All legal size trout were marked with individually numbere~ metal jaw tags; smaller fish were marked by clipping a combination of two fins. Information on the latter was gathered by use of an electrical shocker and gill nets. RESULTS: 'I!.. CATCH l. - -- - -- What returns can be expected from plants of legal size trout? ____, Of 3,000 legal size trout tagged and planted in the test section, 1,099 were recovered from creels for a return of 36.63%. This must be regarded as "a minimum figure, since some fishermen were missed during the heavy influx of fishermen on holidays. Some six access roads and considerable movement by fishermen made 100% contacts impossible. A number of those missed, however, mailed tags into the Denver Office. E2!!, ~ differ ~ species? Rainbows and Lochs were tagged and planted in the test section under identical conditions. Of the Rainbows, 43.60% were recovered as against 29.66% of the Lochs, indicating a much higher recovery of Rainbows during the first years of such plants. In every plant throughout the state, where rainbows and lochs were stocked under similar conditions, rainbows yielded a greater return than did Lochs. Does this differ by time of plant? ----------- - In the test section, returns were best from Rainbows of the latest plant and from Lochs of the earliest plant. dicated below: Returns are in- April 15 plant ·•••·•··•·•Rainbows 42.0% ....... Lochs 42.8% June 28 plant ••••••••••••Rainbows 39.6% •••••••Lochs 17.4" August 20 plant ••••••••••Rainbows 49.2% •••••••Lochs 28.8% 2. How frequently must various types of waters be stocked during the fuhing season to 1nsure that the grade of fishing is to be maintained as steadyas possibi'e1" ...,... - - - - A. B. C. D. E. - Small streams, heavily fished •.......• each 3 weeks Medium-site streams, heavily fished••• each 4 weeks Large streams, heavily fished••·•••••• each 6 weeks Small streams, moderately fished•••••• each 7 weeks Lakes, heavily fished•••••••·••••••••• each 11 weeks �- 3 - These figures represent the time required by fishermen to remove 801o of the tagged fish which were caught during the season of the plant. After this number had been removed, these fish entered the creels in greatly dimin• ished numbers. Although it had been supposed that lochs would provide fishing for a longer period than rainbows, only slight differences were noted in these two species. Small streams included those with an average flow during the fishing season of 100 second feet or less, medium-size streams from 100 second feet to 250 second feet and large streams over 250 second feet. 3. Does heavy fishing pressure "clean 11 ~ average trout stream of e.diiTt n sh? In the study section on the North Fork of the South Platte, where approximately 8,000 fishermen were contacted during the season, intensive census counts were made during the fall of 1947 and the spring or 1948. These operations indicated a fall population of one legal trout for each 5.6 linear feet of stream. 5.3% of the tagged rainbows and 9.9% of the tagged lochs remained in the area at this time. The census during the spring of 1948 indicated a population of one legal size trout for each 5.0 linear feet of stream. Spot checks of other heavily fished streams have given similar results. 4. What percent of legal!,!!! resident trout are caught during one season? Of 595 legal resident trout tagged prior to the season opening, in areas open to public fishing, 123 were recovered, representing 21%. This must also be considered as a minimum figure, as indicated above. ~ ~ differ by species? Of 50 tagged resident Rainbows, 32.0%was recovered, against 19.63% of 545 tagged resident Lochs. While the number of Rainbows was insufficient for an accurate figure, these percentages indicate a considerably smaller percent of legal resident Lochs are caught in one season. 5. In a heavily fished trout stream of moderate s i z e , ~ yield~ - - 'Ee expected from resident fish¥ - - In the 10 miles of study section on the North Fork of the South Platte, fi shermen caught approximately 4,800 resident trout weighing some 800 pounds. This would be a yield of 480 fish and 80 pounds per mile of stream, or 96 fish and 16 pounds per surface acre. Almost twice as many resident lochs were caught as resident rainbows. �,..,. • II. MIGRATION 1. What movement can be expected trem plallts of legal •ite trout !i"'streams? Does this-differ bv species? - ---- -----..:.. - Movement by hatchery reared legal size trout aeems to nry oonsiderably by individual trout and to <litter somewhat between Rainbows and Lochs. However, the question of moYe• ment cannot be fully answered until it is knOWll what happens to fish which are not caught and which seem to have disappeared trom the section where planted. The following material is based on 1,099 tagged Rainbows and Lochs which were cheeked in fishermen's creels in the study section. Lochs exhibited a greater average movement and a greater tendency to move upstream, as shown in the following table. Lochs %caught less than .l mile from place or plant•••••• 20.0 62.l %caught more than .l mile upstream•••••·••••••••••• %caught more than .l mile downstream•··•••••·•·•••• 17.9 1.17 Average movement in miles upstream•••••·••·•··•••••• Average movement in miles downstream.•••••••••••••••• .84 6o.4 %caught within .5 mile of place or plant•••••••••·• %caught within 1.0 mile of place of plant•••••••••• 77.5 %caught more than 5.0 miles from place of plant•••• 1.7 10 .. 1 Greatest individual upstream movement, miles•••••••• Greatest individual downstream movement, miles·••••• 6.7 From these figures it would appear that plants should be made less than 1/,2 mile from sections of stream where public fishing is not allowed or that are inaccessible, and plants at least one mile from such sections would be preferable. How• ever, as indicated above, this is based on fish recovered and could chan,;e materially when movement ot all fish is accounted for. Oases of very considerable movement by individual fish from plants elsewhere in the state revealed one Rainbow had moved downstream 11 miles, one 16 miles, one 17½ miles, two 25 miles each and one 36 miles; one brook had moved downstream 30 miles, one a minimum of 50 miles and a third moved at least 73 miles downstream, from one mile north ot Walden, Colorado, to fif'teen miles north of Saratoga, Wyoming. 2. Do stocked trout :ltend to move downstream from lakes and reservoirs wlth surraoe""'or near-surl'ace outieta,-' - ---Of-reported ---catches - - from-----tagged legal size rainbows planted in Shadow Mountain reservoir, 41% were cauiht in the stream below the reservoir, 32% in the reservoir and 27f. in the tributary �·• I streams. Cens"s operations in the stream below Seaman Rea• ervoir, where 311 tin-olippecl looh leven trout had been planted, indicated that a col'1Biderable number ot these fish had m.o-ved from.the reservoir into the outlet stream. Each ot these reservoirs is new, covers several hundred acres, has a surface outlet and contains excellent natural toods. III. GRCffl'B ,~- . . • •. . •• ~ . trout:, planted· in reservoirs and·· lakss exhibited much more rapid growth than did those planted in streams. The following table shows the average increase in inches in the size of tagged i'ish caught, by months, after date ot plant. This table covers six plants in lakes and reservoirs and sixteen plants in streams. Lakes and Reservoirs tociis Rainbows lat month 2nd month 3rd month 4th month ~th month Streams ka1nSows toclia 1.3 1.78 2.00 2.81 4.00 Second season returns from rainbows planted in Shadow Mountain reservoir showed growth ranging i'rom 5.3 inches to 10.5 inches. One or these i'ish, caught fourteen months after being planted, had increased its weight by eleven times, from one-quarter pound to two and three-quarters pounds. fhe total weight ot the twenty-two percent reported from this plan slightly exceeded the total weight planted. (430.8 ounces to 410 ounces). IV. Post-plant closure to Fishing l. Does a closure to fishin!.cfollowing each plant ot leg%fu.size filgii t eout Immediately i'oii'ow15 ~ trout-prevent § 7-nt, There seems to be little correlation between periods ot closure and the initial catch ot planted legal size trout. In tact, the highest first-week takeout occured atter the longest closing time in the teat section.· The April plant was toll owed by a period ot six weeks • closed to tishing (the season opened Vay 2~), the June plant by a one-week closure and the August plant was made the day before fishing was resumed. The table below shows the per• cent of oatoh during the first four weeks following each plant. Figures are accumulative. In each case 100% equals the total number caught during the fishing season, by plant and speoiea. �- g --- ·~ lat week 2nd week 3rd week 4th week 71% ~ 66% 85,C 53" 79'/e 617' 19" 46,C 65" 82" 81,C 82" 86,C 82% April ,1ant :Rainbows ••••••• Lochs•••••••••• June Plant Rainbows •••. ••·• Lochs•••••••••• August Plant Rainbows••••••• Lochs- •• •• •••• •• 42% 35,C 36" 55" 65" 61" 72% 73" 7~ Does auoh a closure, ~ neoessa2: publicity and advertising 'Iiioreue?!!. Rahing preaauref A definite increase in tishirig pr~asure was noted following periods of closure. Little publ~~ity an~ no· advertising acoo~panied the Apr~l plant. While the opeziing ot the season • would normally -.ttraot as large a number ot fisherman as dllring &12¥ other like period -of th, season, the least number tiahed the study ar.ea at this t~DJ.•• . The closure following ,;the ·June plant waa given ample publioity and the neoessary•newspaper notice of such·olosure. Coupled with a .long 4th of July. week•end, the greatest number ot fishermen was contacted during,-this period.. Similar publi• city accompanied the closure in connection with the August plant~ when the second largest number of fishermen was contacted. Poat-plant closures would seem inadvisable tor the follow• ._ing _reasons a .(1) Such closures do not reduce the i_nitial high takeo~t (2) lecessaey publicity and news• paper advertising attract large numbers of fishermen to the area. (3) Advertising, Josting and-additional law enforcement require considerable expenditures of .department funds and per• sonnel t:Eme. ot planted legal size trout. The table below gives t~e number ot tis~rmen contacted on the study sectio~ during the first tour weeks f'ollowing eaoh plant. Figures are aocµmulative • . 1st plant•••••• I lat week 2nd week ~rd week 649 ·a35 2,118 1,800 2,488 2nd plant ••••• 1,576 3rd plant••••• 1,130 l 979 2.091 4th week 1,253 2,91.12 2,231 �... ,-- - 0000027 I. Titles Returns from Plants or Uarked Fish. 1947. Tl. Dates January 6• 1948 Ill IVs v. Su-pervieor1 Ray h. Hess, Chief Fisheries Biologist Inv.... • ... f\torss Fisheries Research Personnel, Hntoheries Personnel. Warden Personnel and Coopero.ting Fishermen. Introductions During 1947 r1 total or 21,976 marked ·..,•. "''t were planted in Colorado waters. 4,400 of these were plnocd in the experimental section ot the North Fork of the South Platte and have boen included in the report on that project. The follO\"rin~ material covers those planted els8\"1hero. These plt111ts were made in an ettort to increase knowledge on the comparative returns, growth. period of catch. survival and migration exhibited by hatchery reared trout. Compnrisons are made betweon Ro.inbO'W and Loch Levon trout wherever possible. Since catch informtition was from voluntary return or ta~s by fishermen, as a result or publicity given the need tor mailing these tags to the Denver office. total roturns oo.nnot be taken as the total catch. but may give some indication ot the com• parati ve returns fro·n various uaters. Further returns during the next two or three fishing seasons are expected to yield additional informntion on the above sub• jeots. This report covers only first-season returns in all but· one instonce, the plant mado in Shadow Mountain Resorvoir in June of 1946. This rep9rt would have been impossible without the cooperation or numerous sportsmen who reported oatohes or tagged tiah. The willing assistance given by hatohe~ies personnel during ~agging and planting operations is greatly appreciated, as was the reporting of tags by members of the warden force. VI, Summary ot Management Practices Indicated by Tagging Operation Returns: Considerable information is still to be obtained from these plants of tagged fish and f'rom plants to be made in the future. Subject to change as indicated by further and more complete information, the following management praot~ces would seem advisable. 1. Plants of legal-size trout as required at the following frequencies in various types of waters, if the grade of fishing is to be maintained as steady as possible. A. B. C. D. E. Small streams, heavily fished Medium-size streams, heavily fished Large streams, heavily fished Small streams, moderately fished Lakes, heavily fished each 3 weeks each 4 weeks eash 6 weeks each 7 weeks each 11 weeks �. . .. - 2 .. 2. Rainbows will furnish more fish for the creel in waters stocked on a put-and-take basis, 3. Trout which must of necessity be planted in the fall should be placed in lakes and reservoirs rather than in streams. 4. Waters leaving reservoirs fro~ surface or near-surface outlets must be screened to prevent loss of fish, if these waters enter irrigation ditches, power plants, etc. where fish would be lost or killed, 5, Excellent growth of legal size trout in lakes and older reservoirs indicate that factors other than food may be responsible, at least in part, for declining catches. (Research is already begun on the role played by rough fish populations and large predatory species in this decline,) 6. Further evidence attests to the advisability of planting large numbers of fingerling trout in new reservoirs and other barren or near-barren waters. Fifty three inch fingerlings per surface acre allowed excellent growth. 7. Wherever possible, plants of legal size trout in streams should not be made closer than one-half mile from inaccessible or posted waters. VII~ Comparative Returns: 1. Rainbows yielded a greater return than Lochs during the first year. Both species were planted under identical conditions in four streams and two res~rvoirs. Average returns from these streams were 23.41% for Rainbows and 18.70% for Lochs; from lakes the average return was 7.8% for Rainbows and 4.3% for Lochs. For all plants Rainbows averaged 17.72% in streams and 13.65% in lakes. Lochs averaged 13.71% in streams and 4.3% in lakes. In every plant involving both Rainbows and Lochs, the Rainbows gave the higher return during the first year. 2, Streams gave higher returns during the first season than did lakes, Average returns for Rainbows was 17,72%- in streams and 13,66% in lakes. Average returns for Lochs was 13.71% in streams and 4.3f, in lakes. However, in the one plant for which data is available for the second season, Rainbows in Shadow Mountain Reservoir have given a total return of 22%, Further returns are needed for a comparison of total returns between streams and lakes, The percent of tags received from plants in streams seemed to vary directly as the fishing pressure and inversely as the size of the stream, 1'hus, Bear Creek near Denver, Chief and Republican Creeks near Wray and the upper Yampa River near Steamboat Springs showed the largest percent of fish reported, All these streams are very heavily fished aad only the Yampa River approaches the large stream category. �• T Larger streams with very heavy fishing pressure, such as the Big Thompson River, Poudre River, Gunnison River and sections of the North Platte River, gave a higher return than smaller streams, such as the Grizzly River in North Park and Middle Fork of the Michigan River in North Park, where the fishing pressure was less. This higher return was no doubt due to fishing intensity and not necessarily due to better waters. VIII. Growth. Sizes sent in by fishermen are subject to some error, but when sufficient samples were obtained it is thought that these errors would be largely equalized, 1, Trout planted in reservoirs and lakes exhibited much more rapid growth than did those planted in streams. The following table shows the average increase in inches in the size of tagged fish caught, by months, after date of plant. This table covers six plants in lakes and reservoirs and sixteen plants in streams. Lakes & Reservoirs Streams Rainbows Lochs '.R:ainbows Lochs 1st Month • 67 1.3 .20 ,25 2nd Month 1. 59 1.78 .84 ,93 3rd Month 2.77 2.00 .96 1.11 4th Month 4.01 2,81 1.20 6th Month 4.00 Second season returns from Rainbows planted in Shadow Mountain Reservoir showed growth ranging from 5.3 inches to 10.5 inches. One of these fish, caught fourteen months after being planted, had increased its weight by eleven times, from one-quarter pound to two and three quarters pounds. The total weight of the twenty-two percent caught from this plant slightly exceeded the total wei~ht planted. (430.8 ounces to 410 ounces). One reservoir in which fishing success has declined enormously still allowed very satisfactory growth for stocked legal-size trout. In Vallecito Reservoir, near Bayfield, the catch per man hour was .75 in 1944; ,46 in 1945; .32 in 1946 and ,26 in 1947; yet Rainbows planted in this reservoir in 1947 grew an average of 4.28 inches in four months and Lochs grew an average of 2,81 inches in the same period of time. Such excellent growth would indicate that this reservoir would support a greater trout population than it now contains. �IX. Period of Catch. The bulk of the total catch from plants of legal-size hatchery trout, during the season of the plant, is spr~ad over a longer period in lakes and reservoirs than in streams. With equal fishing pressure, the catch is spread over a longer period in large streams than it is in small streams. The following table lists the average time in weeks that were required to remove percentages of the total catch. 66-2/3% 75% 80% 90% Small streams, heavily fished (4 plants) 1.3 1.6 2.5 2.8 5.0 Large streams, heavily fished (14 plants) 2. 8 4.0 6.0 5.5 7.5 Small streams, moderately 5,0 fished (3 plants) 6.5 6.5 7.0 7.5 Lakes heavily fished (5 plants) 9.1 10.1 11.3 12.6 60% x. 7.1 Survival: Since only one plant was made during 1946, the bulk of survival data will be obtained during the next two or three seasons. In Shadow Mountain Reservoir, where the 1946 plant was made, seven percent of the tagged fish were reported caught during 1946 and fifteen percent were reported caught during 1947. This would indicate very good survival in thi s particular lake, and would be in line with investigations made in other states which show much better winter survival in lakes than in streams. All legal size trout which mu st be planted in the fall should be placed in reservoirs and lakes as a good stocking practice. XI. Migration: Migration data from these plants is somewhat limited, since, with the exception of t hose stocked on the Wigwam Club on the South Platte River, no movement within the stocked areas could be measured. However, reports of fish caught outside of the areas where planted lend information which is of value in management . 1. Trout planted in reservoirs with outlets at or near the surface will move in considerable numbers into the outlet stream. Of twenty-two Rainbows reported from the 1946 plant in Shadow Mountain Reservoir nine were caught in the stream �- 5 - below the Reservoir. Fin clipped Loch Leven trou~ planted as 3 11 fingerlings in Seaman Reservoir in July ef 1947, were found in appreciable numbers in the stream below the Reservoir during stream census operations ma.de in December of 1947. 2. Rainbows planted in the South Platte River on the Wigwam Club, {these fish were purchased by the Club from a private hatchery) were logged as to plant in lower, middle and upper sections. The movement of these fish was measurable within one-quarter mile. The following table gives migration data from this plant. II Percent Caught less than mile from place of plant Percent Caught more than mile upstream Percent caught more than~ mile downstream Average movement upstream, miles Average movement downstream, miles Greatest mov~ment upstream, miles Greatest movement downstream, miles 38.8% 24. 7% 36.5% .46 .38 2.0 1,75 These figures compare very well with data from the North Fork of the South Platte, when it is understood that these fish were planted during the late surmner period of lQW water and that movement of less than one-quarter mile could not be measured. 3. Returns indicate that individual trout move considerable distances• usually in a downstream direction. Returns from Rainbows planted in the Taylor River above Almont revealed that 17~1 percent of those reported caught were taken below the lowest point of the plant. Individual movements varied from one-eighth mile to thirty-six miles, and averaged 4,07 miles. Returns from Loch planted in the same stream section indicated that twenty percent of those reported caught were taken below the lowest point of plant. These fish had moved downstream an average of 2.1 miles and a maximum of seven miles. On the Colorado River, downstream movement of approximately twenty-five miles was reported for two Rainbows. One had moved from Shadow Mountain Reservoir to Hot Sulphur Springs and the other from just above Glenwood Springs to Rifle. On the Rio Grande River catches of tagged Rainbows were reported at points eleven, sixteen and seventeen and a half miles below the lowest point of plant (South Fork). XII. Returns from Individual Waters. l. Place of Plant. and Evergreen. Bear Creek, between the towns of Morrison 2. May 20, 1947. Date of Plant: �- 6 - 3. Fish Planted: 4. Type of Marking: 5. Returns: '4:48 448 Loch Leven, 9½11 Average Rainbows. a½" Average Metal Jaw Tags A. Total Returns: B. Percent of Catch by Weeks: Rainbows Lochs 70.7 8.9 8,1 6.5 .9 2 .4 66.0 5.2 4i 2 8.2 4~2 5.2 2.0 1) 2) 3) i6)~ 7) c. Rainbows 28.7ft (129) Lochs 24,1% (108) .o 8) 9) 10) 11) 12) 13) 14) Rainbows Lochs 1.6 .o .o ,o .o .o .9 .o .o 1.0 LO .o 1.0 2.0 Evidence of Migration: Four Lochs were caught in Cub Creek, a small tributary at Evergreen. These fish had moved upstream from two hundred yards to one-quarter mile, D.. Average Length of Fish, by months: , Lochs Rainbows 9~20" (29) 1) 9.04" (37) 2 )' 8.80 11 (18) 9.75 11 (19) 3) 8,50 11 (4) 12.0" (4) 10,0" (5) 4) 8,75 11 (2) 1. Place of Plant: Chief and Republican Creeks, at Wray. 2. Date of Plant: April 20, 1947. 3. Fish Planted: 498 Rainbows, 611 to 14 11 4. Type of Marking: 5. Returns: Metal Jaw Tags A. Total Returns: B. Percent return, by Weeks: 1) 66.6 2) 3) 4) 5) 31.6 31.3% (156) (Date of catch given only as "June" by reporting fishermen) �6) 1.2 23) .6 c. Evidence of Migration: D. Average Length of Fish, by months: None l) 9.46 11 (85) 2) 9.79 11 (49) 3) 10. O" ( 1) 4) 5) 6) 12 . 0 11 ( 1) 1. Place of Plant: Colorado River, Glenwood Springs, upstream to power plant outlet. 2. De.te of Plant: January 21, 1947 3. Fish Planted: 997 Rainbows; 10 11 Average 4. Type of Marking: 5. Returns: Metal Jaw Tags A. Total Returns: B. Percent Return, by weeks: 1) 2) 3) 4) 5) 6) 50.0 19.7 10.3 5.6 1.6 1.6 7) 12.631, (126) 1.6 8) .8 9) 10) 5.6 11) 12) .o .o .o 13) 14) 15) 16) 17) 18) ,d 1,6 .o .o .o .o 19) 20) 21) 22) 23) .o .o .o .8 .a c. Evidence of Migration: Three tagged fish were caught, after they had moved from twenty yards to three fourths of a mile up tributaries. Five had moved up the Colorado River from one quarter mile to two miles. One was caught at Rifle, twenty-four miles below the place of plant. D. Average Length of fish caught, by months: 1) 2) 3) 4) 5) 10. 0" (41) 10. 711 (11) 14.5 11 (2) 11.011 (2) �- 8 • 1. Place ot Plo,nt: Conejos River, below Spectacle Lake. 2. Date of Plant: Week of May 1, 1947. 3. Fish Planted: 1,000 iainbows, 7 11 to 13 11 • 4, Type of Marking: 5. Returns: Metal Jaw Tags. A. Total returns: 10.4% (104) B. Percent return, by weeks: 42.0 10.5 8.5 6.0 11) 12) 13) 2.0 2.0 1.0 2.0 2.0 C. Evidence of Migration: D, Average site of fish caught, by mohths: 1) 2) 1. 9) 10) 5) 6.0 6) 12.0 7) 2.0 8) 3.0 3) 4) 8.9" (38) 9,3 11 (32) Place of Plant: None 8.6" (12) 10.5tt (3) Grizzly River, confluence with Colorado Creek to Colorado Highway 14 Bridge, North Park. 2.· Date of Plant: June 11, 1947. 3, Fish Planted: 250 Rainbows, 8 11 to 911 • 4. Type of Marking: 5. Returns: Metal Jaw Tags A, Total Returns: B. Percent return, by weeks: 1) .o 6,4% (16) 5) 31.25 6) 7) 12. 5 C. Evidence of Migration: None. D. Average size of fish caught, by months: 2) 3) 4) 1) .o .o 25.0 31.25 8.5 11 (9) All caught during July. �• i - 9 - 1. Place of Plant: Gunnison River, Gunnis on to Iola ~ridge. 2, Date of Plant: May 15, 1947. 3, Fish Planted: 992 Rainbows, 711 to 1011 , 4. Type of Marking: 5. Returns, Meta l Jaw Tags. A, Total Returns: B, Percent return, by weeks: 1) 2) 3) 4) 6) c. 28.0 7.4 4.0 10.7 4,0 15,02% (149) 6) 7) 8) 9) 10) 11) 12) 13) 14) 16) 12.0 8.7 6,0 7,4 4.7 3.7 .o 1.6 .6 .o 16) 17) 18) 19) .o .o .s .s Evidence of Migration: Five tagged fish were caught below the Iola Bridge, one 3/4 of a mile, one l mile, and three an undetermined distance. D. Average size of fish caught, by months: l) 2) 3) 8,76 11 (70) 9.2" (45) 9.8 11 (14) 1, Place of Plant: <Alnnison River, Gunnison to Iola Bridge. 2. Date of Plants August 15, 1947. 3, Fish Planted: 200 Loch Leven, 911 to 12 11 , 4. Type of Marking: 5, Returns: Metal Jaw Tags A, Total r etu rns1 B, Percent return, by weeks: 20.6% (41) ,) 2,5 5) 6) 5.0 C. Evidence of Migration: None. D. Average size of fish caught, by months: 1) 2) 3) 62,5 12.5 17.5 1) 12.4tt (9) 2) 12.111 (7) .o �-10l. Place of Plant: Gunnison River, Gunniaon to Iola Bridge. 2. Date of Plant: Aug\lst 29, 1947. 3. Fish Planted: 464 Lochs, 8½11 average. 4. TYPe of Marking: 5. Returns: Metal Jaw Tags. A. Total Returns: B. Percent return, by weeks: 1) 2) 3) 4) 3.9% (17) 12.0 12.0 29.0 41.0 5) 6) 7) .o 8) 6.0 .o .o c. Evidence of Mi gration: D. Average size of fish caught, by months: 1) 8.6 11 (17) None. All caught during September. 1. Place of Plant: Michigah River, North Park, on Brownlee, Richards and Simson Ranches. 2. Date of Plant: October 14, 1947. 3. Fish Planted: 247 Brooks, 1¼ Pound Average. 4. Type of Markingi 5. Returns: 1. Place of Plant: Middle Fork of Michigan River, on Colorado State Forest near Gould. 2. Date of Plant: June 13, 1947. 3. Fish Planted: 500 Rainbows, 8½" Average. 4. Type of Marking: 5. Returnsi A. Metal Jaw Tags. None Total Returns: Metal Jaw Tags 15.81, (79) �- 11 B. Percent return, by weeks: 1) 5) 6) 7) 1.3 2) .o 3) 5.1 4) 24.0 l, 2, 3. 4. 6. 13.9 10.1 16,5 10.1 8} 9) 10) 11) 6.l 5.1 2.5 6.3 12) C. Evidence of Migration: D. Average size of fish caught, by months: 1) 9.0 11 2) 3) 8. 6 11 8.9 11 None. (4) (33) (19) Place of Plant: North Platte River, on Mallon Ranch west of Walden. Date of Plant: June 12, 1947. Fish Planted: 500 Rainbows, 9" Average~ Type of Marking: Metal Jaw Tags. Returns: A. B. Total returns: 24.6% (123) Percent return, by weeks: 1) 2) 3) 4) 5) c. 0 22.5 2.0 27.5 8.5 6) 7) 8) 9) 10) 9.5 1.0 1.0 5.5 7.5 11) 12) 13) 14) 15) 3,0 6.5 .o 16) 17) 3.0 18) .o .o 19) 1.0 .o 1.0 Evidence of Migrations Eleven tagged fish were caught from one-quarter to one half mile below the place of plant. D. Average size of fish caught, by months: l) 2) 3) 9.6" (21) 10.1 11 (50) 10.1 11 (18) 4) 5) 10.7 10.7 (4) (2) l. Place of Plant: North Platte River, Mallon Ranch west of Walden. 2, Date of Plant: October 21, 1947. 3. Fish Planted: 148 Brooks, 1½ Pound Average. 4. Type of Marking: 5. Returns: None Metal Jaw Tags, �- 12 1. Place of Plant: South Platte River, ~n l'figwam Club, near Deckers. (Fish purchased from private hatchery). 2. Date of Plant: August 6, 1947. 3. Fish Planted: 500 Rainbows, 911 to 12 11 • 4. Type of Marking: 5. Returns: A. B. Metal Jaw Tags. Total returns: 34. 0% (170) 1) From Club area 21.2% (106) 2) Below Club area 6,0fo (30) Above Club Are~ 6 38% (34) Total off c:;.u';:, Are:,,,. 18 .8% ( 64) Percent return, by ',\'B ➔ :r:: On Club Area ( 50) Total 20~0 2.0 24.0 1) 16.7 2) 6.2 3) 11.4 4) 8~7 5) 7.9 6) 10.5 Off Club Area ( 64) - 1) 2) 3) 1) 2) 3) 4) 5) 6) c. 1s.s 9~4 15.8 10.7 10.7 12.6 7) 8) 9) 10) 11) 12) 13) 4~s 10.7 3.1 0 0 1.1 4) 5) 6) 14.0 2.0 7) 8) s.o 9) 6,0 10) 4.0 11) a.a 12) s.o .o 8.0 1.7 7) 8) 9) 10) il) 12) 13) 11.4 7 .o 12.3 2,6 .o 4.4 .9 Evidence of Migration: II Percent caught less than mile from place of plant 38.8 24.7 Percent caught more than mile upstream Percent caught more than 4 mile downstream 36.5 ,48 Average movement upstream, miles Average movement downstream, miles • 38 Greatest movement upstream, miles 2.0 Greatest movement downstream, miles 1.75 D. Average size of fish caught, by months: Off Club Area On Club Area Average 1) 2) 3) 1) 2) 3) 1} 2) 3) 10.9 ( 17) 10.7 ( 21) 10.0 (2) 10.3 (12) 10,3 (14) 10~0 (3) 10.6 (29) 10.5 (35) 10.0 (5) �- 13 - ' Poudre River, from two and a half miles above forest boundary to twenty miles above. l. Plaoe of Plant: 3. Fish Planted: 4. Type of Mark ing: 5. Returns2 500 Rainbows, aII ave r age; 500 Loch Leven, 8 11 average. Metal Jaw Tags Rainbows 22,2% (111) Lochs 12.6% ( 63) A. Total Returns: B. Percent Return, by weeks: Rainbows Lochs l) 2) 79.9 9.1 18.9 6) 7) 3) 4) 5) 3.7 10.4 .9 1.7 c. 48.3 .o 5.5 Rainbows Lochs 6,9 3. 5 8) ,o .o ,o 9) .9 1.7 10) 11) .o .o .o l. 7 .o Rainbows Lochs .o .o .o .o .o 1.7 1.7 12) 13) 14) 15) 16) 17) .9 Evidence of Migration: One Loch was caught five miles below the lowest point of plant, and one Rainbow was caught an undetermined distance up the Little South Poudre. D. Average size of fish caught, by monthst 1). !l 5) Rainbows Lochs 8.55 11 ( 74) 9.00 11 (20) 9,00 11 (2) 8.811 (24) 8.9" (21) 8,9 11 (6) 9.00 11 (1) l. Place of Plant: Rifle Creek, at Rifle Mountain Park 2. Date of Plant: October 3, 1947. 3. Fish Planted: 200 Rainbows, 7 1' to 9 11 , 4. Type of Marking: 6. Returnss A, Total Returns: Metal Jaw Tags. 3. 5% (7) .o .o .o 3.5 �- 14 B. Percent Return; by Weeks: 3) 14.5 4) 67.0 C. Evidence of Migration: None D, Average size of fish caught, by Months: 1) 2) 28.5 1) .o 8.6" (4) All caught· during October. 1. Place of Plant: Rio Grande River, one and one half miles above South Fork to confluence with Goose Creek. 2. Date of Plant: April 28, 1947. 3. Fish Planted: 998 Rainbows, 711 to 9 11 • 4. Type of Marking: 5. Returns: Metal Jaw Tags. A, Total Returns: B. Percent Return, by weeks: 1) 2) 3) 4) 5) 6) C, 7) 8) 9) 10) 36.0 6.8 6, 6 5.6 6.2 8 .1 11~ 12 17.2% (172) 10.0 3.7 2.5 5.6 2.5 3.7 13) 14) 15) 16) 17) 18) .o 1.3 .6 .o .6 .o 19) 20) 21) 22) 23) .o .o .o .o .6 Evidence of Migration: Three tagged fish were caught at points 11, 16 and 17½ miles below t he lowest point of the place of plant, and one an undetermined distance below. One fish had moved an undetermined distance up the South Fork, D. Average size of fish caught, by months; 1) 2) 8-5 (56) 8,3 (31) 3) 9.35 (30) 4) 6) 6) 9.0 10.0 9.0 (12) (2) (1) 1. Place of Plant: Taylor River, Almont to six miles above. 2. Date of Plant: May 16, 1947. 3. Fish Planted: 998 Rainbows, 7 11 to 10". �- 15 .. 4. TYPe of Marking: 5. Returns: A. B. c. Metal Jaw Tags. Total ~eturns: 13.6% (135) ' Percen~ Return, by weeksl 1) 2) 3) 4) 5) 13. 1 ll•5 10.0 6) 7.7 7) 8) 9) 10) 11) 12) ll.5 3~8 6,2 6.9 4.6 13) 14) 3.1 3.1 .a .o .o .o 15) 3.8 8.5 16) 4.6 18) 17) 19) 20) 21) 22) 23) ~o :o .o ,O .8 Evidence of Migration: Twenty-three tagged fish were caught in the Otlnnison River, having moved downstream from one eighth mile to thirty-six miles, and averaging 4~07 miles. This represents 17-.1% of those caught and reported. D. Average size of fish caught, by months: 1) 9.011 (59) 9,1 11 (27) 2) 3) 9.1 11 (25) l. Place of Plant: Taylor River, Almont to four miles above. 2. Date of Plant: August 30, 1947. 3. Fish Planted: 449 Lochs, 8½11 Average. 4. TyPe of Marking: 5. Returns: Metal Jaw Tags A. Total Returns: B. Percent Return, by Weeks: C. 1) 35.0 2) 3) 15.0 4) 35.0 4.5% (20) 5) 6) 7) 8) .o .o .o 5.0 10.0 Evidence of Migration: Four tagged fish were caught in the Cllnnison River, having moved downstream an average of 2.1 miles and a maximum of seven miles. These represent twenty percent of all marked fish caught and reported from this plant. D. Average size of fish caught, by months: 1) 8.9511 (15) 2) 9.10" (3) �. .- 16 l. Place or Plant: Big Thompson River, from four miles below Estes Park downstream to the Dam Store. 2. Date of Plant: May 16, 3. Fish planted: 500 Rainbows, 9 11 averageJ 500 Loch Leven, 8 11 4. Type of Marking: 5. Returns: 1947. average. Metal Jaw Tags. A. Total Returns: B. Percent Return, by weeks: Rainbows 1) ~) 5) 4) ~~ 7) 8) C. 67.0 15.0 5. 5 5. 5 5.0 1.0 1.0 Rainbows 22.0% (110) 21.2% (106) Lochs 57.2 18.8 5.0 3.0 3.0 1.0 1.0 .o Rainbows Lochs .o .o .o .o .o .o .o .o .o 9) 10) 11) 12~ 13 14) 15) 16) Rainbows Loohs .o 17~ 3.0 1.0 .o 1.0 1.0 1.0 18 19) 20) 21) 22) 23) .o .o .o .o .o .o .o 2. 0 Evidence of Migration: One tagged Loch was caught one-quarter mile up the North Fork, at Drake. D. Average size of fish caught, by months: Rainbows Lochs 1) 9.4" (53) 8.6 11 (43) 2) 9.1 11 (25) 9.1" (20) 3)11.2 11 (2) 8.5 11 (2) Rainbows 4) 5) 6) Lochs 10.on (2) 9.5 11 (4) 9.2" (1) 1. Place of Plant: Big Thompson River and Fall River, near Estes Park. 2. Date of Plant: August 26, 1947. 3. Fish Planted: 94 Rainbows, 1½ ~ound average. 49 Loch Leven, 12 pound average. 4. TYPe of Marking: Metal Jaw Tags. Lochs .o .o .o .o .o 1.0 1.0 �- 17 - 5. Retutns: A, Total Returi,.s: B. Percent Return, by weeks: Rainbows Lochs 1) 36.4 so.a 2) 45.4 9.1 50.0 3) 4) C. Rainbows 1U6% ( 11) Lochs 6,25% (3) Ra.inbows 6) 6) 7) 6) .o Lochs .o .o .o 9.1 Evidence of Migration: One Loch had moved up Fall River a distance of one and one half miles. D. Average size of fish caught, by months: No Data. 1. Place of Plant: White River, on Rio Blanco Ranch &bove Buford. 2. Date of Plant: September 6, 1947. 3. Fish Planted: 300 Rainbows in upper area, 11. 511 average. 300 Rainbows in lower area, 11.51.,, average. 4. Type of Marking: 5. Returnss Metal Jaw Tag~. (Lower area only) A. Total Returns: B. Percent Return, by weeks: C. 1) 6.1 2) 3) 39,3 12.1 10.6% (32) 4) 5) 6) 3.0 33.2 6.1 Evidence of Migration: Six tagged fish (2% of upper area plant) from the upper plant were caught in the lower area. One fish from the lower plant moved downstream at least ten miles and was caught near Buford. D. Average size of fish caught, by months: 1) 2) 11.7 11 (8 ) 11.911 (22) �- 18 1. Plaoe of Plant: Yampa River, at steamboat Springs. 2. Date of Plant: June 27, 1947. 3. Fish Planted: 48 Rainbows, 12 11 to 14 11 • 4. Type of M~rking: 5. Returns: Metal Jaw Tags. A. Total Returns: B. PercentReturn, by weeks: 1) 2) 3) 4) C. 38.0 14.3 19.0 .o 43.7% (21) 5) 6) 9.5 4.8 7) 8) 4.8 .o 9) .o 10) 11) 4.8 t.8 Evidence of Migration: One tagged fish was caught one and a quarter miles up Walton Creek, showing a total upstream movement of two and three quarters miles. D. Average size of fish caught, by months: 1) 2) 11.5 11 12.7 11 (2) (9) 13.7 11 (2) 15.0" (1) l. Place of Plant: Upper Willow Creek, near Granby. 2. Date of Plant, September 17, 1947. 3. Fish Planted: (All resident fish) 21 Natives, s½" to 10 11 17 Brooks, 6½11 to 1011 7 Native-Rainbow Crosses, 611 to 911 6 Rainbows, 6½" to 10° 1 Loch, 17" 4. Type of Marking1 Metal Jaw Tags. 5. Returns: 1. Place of Plant: Hell's Canyon lakes, above Monarch Lake. 2. Date of Plant: September 23, 1947. 3. Fish Planted: (All Resident fish) None 4 Rainbows, 8° to 9" 4 Native-Rainbow Crosses, 9" to lo½" l Native, 11" �.. - 19 4. Type of Marking: Metal Jaw Tags. 5. Returns1 1, Place of Plant: Big Eggleston Lake, Grand Mes&. 2. Date of Plant: June 17, 1947. 3. Fisl\ Planted: 500 Rainbows, 7" to 911 • 5, Returns: None. A. Total Returns : 18.4% (92) B. Percent Return, by weeks: 8.0 6) 7)· A) 0) 5. 0 10) 9,0 1. 0 8.0 3. 1 1.0 11) 12 ) 2.0 J.3 ) 3.3 14) 15) 3.3 C, Evidence of Migrat i vn: None, D. Average lengt h of fish caught, by months: 1) 2) 3) 4) 5) 1.0 19 ~0 35.0 1) 8.7 11 (le) 2) 8.9" ( 4:9) .o 1.0 3) 9. 711 (9) 4) 10.8 11 (7) l. Place of Plant: Shadow Mountain Reservoir, near Grand Lake. 2. Date of Plant: June 25, 1946. 3• Fish Planted: 100 Rainbows, 8½" Average. 4. Type of Marking: 5. Returns, Metal Jaw Tags. A. Total Returns: 1946 - 7% 1947 - 15% Total •-22% B. Percent Return, by months: 1946 June July August September October 1947 .o 14.3 .o 57.1 28.6 May June July August September 26.6 60.0 6.7 6.7 .o �• - 20 - c. Evidence of Migration: Of seven tagged fish caught during 1946, two were caught one half mile below the Reservoir, two were caught one hundred yards up the North Fork, two were caught one quarter mile up the Colorado River and one was caught in the Reservoir. Of fifteen caught during 1947, seven were caught below the Reservoir (one of these approximately twenty-five miles downstream), one we.a cs.ug!1t 250 yards up the North Fork, one in the stream between Shadow Mountain Reservoir and Grand Lake ?nd six in the Reservoir. Thus, of the total retu:rn of twenty-two, ni.ne were caught below the Reservoir, six had moved a shor·~ wuy up tributaries and seven were caught 'Ln the Reservoi:r. D. Average size of fish 09.Ught, by months: 1946 19,:,7 1) 2) 1) 3) 4) 5) 12. 50 1: (4) 2) 3) 4.) 13.8 11 (3) 14.17 11 (9) 14.011 (1) 19. 0 11 ( 1) 12 . 25 '! (2) One fish, caught in August of 1947, some fourteen months after the ple.nt, had reached a length of nineteen inches and a weight of two and three quarters pounds, Its weight had increased approximately eleven times during this period. The total weight of the one hundred fish, when planted, was approximately 410 ounces, while the combined weight of the twenty-two caught and reported was approximately 430.8 ounces. l. Place of Plant: Shadow Mountain Reservoir, near Grand Lake. 2, Date of Plant: July 29, 1947, 3. Fish Planted, 500 Rainbows, a½" average. 500 Loch Leven, 9" average. 4. Type of Marking: 5. Returns: A. Total Returns: Metal Jaw Tags. Rainbows 5,8% (29) Lochs 1.6% (8) �... 21 - B. Perci&nt Return, by weeks: Rainbows Lochs 1) .o !o 2) 3.7 3, 7 3.7 .o .o 3) 4) 5) 14.8 c. :Rainbows Lochs 6) 7) 14,8 .o .o .o 8) 29.S 29.S •o.o 9) 20.0 20.0 20.0 Evidence of Migration: Six of these tagged fish (6 Rainbows and l Loch) were caught in- Grand Lake. D. Average size of fish caught, by months: 1) 2) Rainbows Lochs 9 • 44 II ( 4:) 11.02 11 (21) 10.4 11 (4) 1. Place of Plantt Sea.man Reservoir, near Fott Colline. 2. Date of Plant: July 21 1S47. 3, Fish Planted: 2,000 Lochs, 311 average (Part of a total plant of 66,000). 4. Type of Marking: 6. Returns: Both Ventral Fins Clipped. A. This reservoir was closed to fishing during the 1947 season. Seven fin-clipped specimens were taken from a short section of the stream below the reservoir during stream census operations in December, 1947. B. Growth: Specimens CQllected avera~ed seven inches in length, showing a growth of four 1nches in five months, c. Evidence of Migration: Specimens were taken in the North Fork of the Poudre River, below the reservoir, indicating that trout stocked in lakes or reservoirs may be expected to migrate downstream in appreciable numbers if the outlet is favorable for such movement. Much of the water leaving this r~servoir passes over a spillway. �- 22 l. Place of Plant: Va.llecito Reservoir• near Bayfield. 2. Date of Plant: April 19~ 1947. 3. Fish Planted: 486 Rainbows, a¼" averat;e. 498 Loch Leven, a½" average. 4. Type of Marking: 5. Returns: A. Metal Jaw Tags. Total Returns: Rainbows, 13.0% (62) Lochs B. 7.03% (35) Percent Return, by weeks! Rainbows Lochs 9.5 4.9 3.2 6.1 4.9 7.9 4.9 2.9 1) 2) 3) 4) 5) 6) 2 i. 9 8) 9) 5.7 1~) ~o 10) a.s Rainbows Lochs .o 14,3 9.5 3.2 14.3 11.4 5.-7 5.7 .o Rainbows 14:) 15) 16) 17) 18) 12) 13) 7,.9 c. Evidence of Migration: None. D. Average Length of fish caught, by months: 7) 8.5 11.4 Rainbows Lochs l) 9.60" ( 17) 2) 10.42tf (13) .o 4.9 9.70 11 (5) 10.2811 (18) Rainbows 3) 11.75 11 (22) 4) 12.53 11 (7) 1. Place of Plant: Ward ~a.k:e, Grand Mesa. 2. Date of Plant: June 19, 1947. 3. Fi sh Planted: 400 Rainbows, 8 11 to 9 11 • 4. Type of Marking : 6. Returns: A. Total Return~ Metal Jaw Tags. 20% (80) 19) Lochs 7.9 6.1 1.6 .o 1.6 1.6 Lochs l0.5d' (2) ll.3r1 (8) .o 2.9 2.9 5.7 s.s 2.9 �,,, - 23 - B. Percent Return, by weeks, 1) 7.5 2) 13a0 3) 13.0 4) 10.0 c. 5) 6) 7) 8) a.o 9) 10) 11) 12) 7. 5 1.5 1.5 11.0 11.0 2.5 6.0 13) 14) 15) .o 1.5 6.0 Evidence of Migration: Ah example of rapid movement within the lake and the willingness of trout to feed soon after tagging was not~d by Paul Barrows, Department employee, during planting. These fish were tagged from the tank truck after reaching the lake, an operation requiring approxi~tely two hours. Before the tagging was completed a fisherman brought to Mr. Barrows one of the tagged fish which he had caught at the other end of the lake, approximately one half mile from the point of release. D. Average size of fish caught, by months: 1) 2) 9.0" (10) 9.2 11 (28) 3) 4) 9.67 11 (20) 10.s" (11) �I. Report of Invoatigations Conducted on ward Lake Titles II. -Date: • January 9, 1948 III. Supeniaor, R. . B. .Hesa. Chief Fi1herie1 Biologist IV. Investigators w. D. Klein, P. T. Barrows ~ v. Introduotiona A week extending from June &throup June·12 was spent studying the auoker p~'blea in Ward ~d.Alexaade~ Lakes on Grand lleaa •. In oon• junction with the above study- a sucker ·trap wa1 operated ··at ·the inlet to Wai-d Lake rrom 6 June to 10 July. !lr._P. f. Barrows assiated with the-investigation and operated the trap from 16 June to 10 July. The investigation on Alexander Lake ia covered in another Teport. VI. ·Summary: l. Ward Lake is a· natural -crater lake .that covers about 200 surtaca acres; the lake ia very deep. 2. Zooplancton wai good i-n the lake ,and trout .tood found in bottom samples poor. The Shoal area is relatively Umited. a•. For irrigation purposes a dam has been conatruoted at the lower end of the lake.·. · Thia d- ·is about 30 feet high and permita a water fluctuation ot about 25 teet ln the lake. 4. • The. trout population :conststs.. ot Brook and Rainbow, averaging a~ou~ 8 inches in length. 6 •. Spawning areas are limited tor trout. &·. There is a·. substantial· population of Rosyside suckers . {Oataatomus teoundua) in the lake at the present time. 7. !he trap installed at the -lake inlet resulted in a oatoh ot l,1~6 spawning auokera. 8. Ward Lake·. ia too large and deep to IVlke a complete treat-mant ot the lake_wi~h derris practical. 9. lf~ oonoentration ot suckers,· other th~ in the inlet, was noted that would warrant attempts at control poisoning with derria. �• 2 .. 10. It is doubtful that the ·suekers could be controlled by trapping. At best it would be a long ~ime operati~n that would never completely rid the lake or Nokera. 11, Trout fishing is stil~ relatively good in the lake; a. catch per man hour ot 1,38 was recorded by wardens in 1947. 12. Returns trom tagged, hatchery reared rainbows indicated favorable growth and catch. VII. Reoommendation11 1. Attempts to control suckers 1n Ward·Lake be discontinued indefinitely by the Department. 2. Stock only legal eize rainbow tor three years, beginning in 1948. Only enough time was spent on Ward Lake to become aware ot some o( the problems and to trap those suckers running up the inlet to spawn. It would require a more comp~ehens_ive study to obtain sufficient· information to correctly Jft&nage the lake. Ward Lake ia partially a storage reservoir and the water level can be fluctuated abO\lt 26 teet. The water was drawn down when this investigation was made, making 100 yards ot stream available to the spawning suckers. Thia inlet stream is about 150 yards long and runs trom Alexander to Ward Lake·. It was running 6 o.t.s. at the time ot the investigation. • An upstream barrier existed 100 yards above Ward Lake where the stream passes beneath a road and drops tour teet from a culvert to the stream bed below. When Wai-d Lake is full, fish have free access between the two lakes. The suckers were running into the Ward Lake inlet on 6 June and a trap was installed immediately above the lake in the inlet on that date. Trapping waa continued until 10 July. In this interval ~,126 Rosyaide suckers were trapped and removed from the lake. The auokera ran at night, starting into the inlet as soon as it began to get dark. When a large number of suckers would get into the trap they would struggle violently to continue upstream and often succeeded in wotking underneath the trap. However, they were limited in the distance they could go above the trap and these suckers were removed by use ot a shocker. �.• . ·, The ..run ot suokers :.:va~:l:ed &:- rgr..e.a"t :·c:lttal· :·from: 4•Y .:to . :day. · Cold w:eather •. se.emed: :-to ·:di$0.ourage.~ the: .nine •. •.It .:is .-not thou.ght ·that·.:;many. .iaore· ;suokers• 1·entered-:thEl:'inlet· ·.to ·&pawn than were acco.unted :f'or.,_-.by ··the. trap ,·or. :,by: .ahoakinu, but there oould hav• --been :·an, .early: .run, b·e·tore ;"the .-t.Fap.-was ·, .. installed. • . Data ,was .ge.thered- .on-weight.; and -.length :"ol \the _:auckers .ed ,. •soales -were collected··.tor. ··age. --d&.~emination. : ·.The .-lengths . ,and weights are as £0llows1 .. : Samples collected 6 ,June 1 • .12.73: inches ;..·-.Average. length or .:123 .suckers 11 • " " _.; .49 ,male 11 n " ·; ~7 4 :female : • ·,Ave~,ige .w~ight . of . -:84 ~suckers !· " ·- t1 " " • 11 11 ; ·-13 •. 29 ·, " .12..19 . :.:/32 ·fsmale;,auckers :S&.·-..m&le n 11 ·; :1 •" , .• 78 ·pQunds ...,.90 •" . ·:.70 ·• n :•.Sample• ('collected 8 •...June t :1 ,Average. -length :of. 4Q :suckers • n • 11 ,. ,t • 11 1 • '-~:16 ,-:flemale·•auo.kers tt. ,24;::male 11 . ·.Average weight ··ot 40 .~auck-ers 11 •• " • ~ - l6 •female . suckers 4 • • • 11 11 ~• . 24 · male • t1 ·: . 13 ~08 : inches :_ (14.·oa • " .. 12.4? " . :.·97.._.· pounds • .1.13 .73 : 11 •" • Aval"ages. for. -all su.ckers -w~ighed: and :-measured: : :Average. length '.0t-.-163 .suckers ··.-Average. weight· ·of ..124·.. suckers 12.a ·.inches . .81. pounds ·1!he -largest ,sucker ·-taken was -:'~11'·:·i~ches ·long-and-weighed .' 2j'· ·pounds. • : Scale.· samples ··from: 40 .;au·okers. were, r:ead •. , The. ree,ults are as follows: • :lumber.· of.. Samples .":..:ffl . 2 •;:·4ears 19 16 :_, 6 ·.: 5 .:. 4 .. 3 II .... ., 11 Adequate gill •neta·~were.not .-available ·at ·the .time the survey-•was :made, so~ it ·-was: not ,possible ~to .make ::an .·estimate · .on· the•-.ratio: ot•trout·to, euokers•jl1:•.the··.lake. �&,• •:. • .. ~ ~ . :, • :However~ it ·1, likely that the sucker~ p1:9eserJ.t• compete _.. . : ~- ,. · ·.with·, the trout to some .. e~~,r;,.t :. tor ;tood ._:and t~erei'ore are detr~1',tal ~ . . • • :_ •·:: :.. .: :· •• • :,·:·; • l. ·; ~ ~~mb~;, '··. ·. • To· tiU'b~'.taiit_i,i1lY 'Nlduo( ~~'.' ~t sUOker~ wo~l~ ~a•.... : · . quire succea49tul: trapping t9r: •--nwnber ot ~&J".S -in · . ·: auoceas;~n -~d--.,the '..sucaess of~,auoh ·trappi}'C .would be ,. .. . .jeopai·dized ~Y a. -possible· intl'1X· ot ·suok~rs. 1)-.om ·Alexander :. ~- .. :Lake~·r:A ~~her probl&~ -yi~~d. be prese*ted. ~f\.the auclcere · ·,. ·. spa'Wri ~o an7 ~Jtent- iroti1;td. :tl'.i,e_- lake shore_. It _.il·.·thought . that· th9.y do :~~cause ·~tlle •~uc~e:r.s· seemed to .conceatrate in _. _-· certain_· ,~h~•l ,ir.eas wluiz:e )i~epage was· _evid~nt; a:t,~ve •t~• . wateriin~ -~~ .probablf e~·,nc1e~ into'-the ihoai-area. •·No . , . •.auoke;r•~ ·were. aotually-· •~~~ •~P,awn:l.ng· in· these areas but <-: .oloae. ob~~.;v~tions :cou~d .·~o~ ..b":·made 'without disturbing , . ~He auoket.a. .~ -.~so, ·t·luctuation ot the lake lev~:l;·woulti .., ,complic•te trapping oper~~~oiti~--- ·tn the· i~let.: an4: a1i'. oert~in lake lere~~ i~•pping-wou~ctbe._.i!l)poasib;J.·~~- ·, ._ ·. ~ · •. • ,. :· • .. ·: .. .. :_·::. ··:Fo~ · the!. ·ib,o~" r~~ona· cou_pl~A- with· the:, tact. 'tha~·-. i'r1tora~· ·. ··tion obt~inep: trom tagged h~to~~ry tr·ou~ ~- .f~rorable:· an~ · warden rep~·r.ta indicate -~!l!hing in_·Ward ~alee is .-still above . the.·state av~rage tor lakes, ..it.-is. ·recommen4ed t_hat no further_. .~t~·enlJ)~ -.to redu~e. ~¥~, _st1Qker population in the. lake .be. made·.- I~ .a~y -event· tu'rtlier study of the trout-sucker relation·ship in the lake wo~l~ ~e -.neoesaaey l;)etore any· lo~g range sucke~ .Q(?n1irol prograi;· _s_hould ,be initi~ted. : · • •: •• : 1 ' i~, ~o\it ~ishing -i~ Warii Lak11,. ~B ,go~d but the .:trout were allr·relatfv,ly ~-.11.·:.-·,No ·troµt~··~ver 10· ino~ea .. in -length ••• were caught· or checked ··du~ing ;th~.; investiga~ion. ~ Residents on-.the Mesa•·st~ted -that :no!• ~i;rge •.t_rout (over 12. ·iJiches) • have ·been ··~augh~- in Ward L~_,:· tor-a.nwnb·er ot·years. Thia ia. dt:tfiofrl~ to .,~;1:p1au1: 1ls stQoking of legal aize f'ish has been:-carr;et( Q~ fqr ~atrleast .three years •. N_o intqr.mat·ion ... _ was· obtained during the inveat~_gation .that w~~ld aoooun-e ' • • for this l'-_ok. ot .larger_ t!~ut_. ·:·. ·.-· ... • .• :··. •_ :·. · · • · 1 1 -~ Soalea from' \Y~d •L~ke •ti-011t ··we~~·. 0~1.i~c~ed •~or, age •d~termin• a.tion but ·-·~x~ji~tio.n ·of: the_;stockiiig. ·.records ·showed there would btf·conf\i.a.ion b.etween hatchery and natural growth•, • • • making scal'.e readings meaningl,ss~ _.Fortunate·~y, ~, stocking of' tagged trout g~ve sonte grow:t~ information11 • • • • •• • b~ ... It was felt. .·that. ~~!lie i~ol'lilatiOn 0/ve.1u~ .oo~id obtaille~ ' ' • , . . .. . . . . on the trout and. ti&hing·- con~iti~s in Ward L~e it a ·pla11t- • ing ot· taggeci .fish. was: made. Therefore,· 400 r~inbow trout, . . • averap,ng 9 ~0 ;;nobea in . lengt~,. ,v1~r~. :tagged ··:i,n~ ato~ke~· on '~& •• June 194-7·. •0~ .thi_s: number· :2q" ·_or 80~ tags-: were· volu~tarily returned~. to. t~~ •Dt,partment' by. Dep~J;lll}.or 1947·~ Compared with tag returns· tr-om otb,er.'.wa.ters· •in the state this 20" indioates a good .'Jteturn trom stocking. It also means that probably eaob seasons stocking ia heavily drawn. on by the end of the ·,. ., : �..... • :·I'•... -;-- season. :In Wa1rd. bake, where spawning areas tor trout are very limited and the· lQ\ce is a,oces.Bible. by road, yearly stocking is ne~essary~_ '. ·: ·; ·' •• : ,. • ; . . -. : ·. . ·-' ·; ': •Th~ tagged fish' also made· :ti.To:rable growth. Tagged trout oaught in Ward Lake near th~ en~ .of .the. season showed 11' inches of: growth from: • -·. .,. . . time . . . or ·.. ·planting._ . .. . . '. ' •In ~~der to hav~ a· comparfsol'J.. on tagging result·s· 112: Ward Lake., 600 •rai_nbow trout were: ·tagged ._and plant·ed in Big : - Egg-leston Lake .. on ·17 ·Ju~e !94'7, ~Jiese .trout were similar i~ ,size to the plant made i.n Ward Lale~. Of the tagged . •. _fish in· Big Eggleston· Lake i8.4% w.ere voluntarily returned· by pe~ember and·the·fish·had gr'own 1.8 inches by the end of the 1947 fishing season. This lake_ is considered.good - .fishing, aome•·large fish . are and the.re :are no ·suckers. . . .. caught . . ... ' Comparing the. tag ·return ilif'ormatio~ on Ward and Big .Eggl,ston ·Lakes indicates the suckers did not adversely effect the fish or fishing in W~d •L~e •when ·leg-al trout wer~ planted.·· :. • '· • • ~ ' " .T~ ob~ain a more complete picture·or· conditions in Ward Lake the catoh and stocking _records tor the last five years are presented in. the·f'ollovdng·tables • . _· Stocking.I R~ords . , Year mr i944 1945 1946 1947 Species Brook Size Under°3-rn~ches Rainbow Over 6 inqhes Brook. : 3 ·to 6 inches Rainbow Under 3 inches Rainbow Over 6 . inches . Rainbow •. . Over ·s. inches •• Number 19,890 2,39.4 9,804 14,040 S,420 4,257 Warden Report Oat ch. 'Iiecords ......... N'o. ot' Fishermen Catch per A'Verage Aviirage • Contacted man hour Lengtb Length (! ,. • • - Year 1943 1944 1945 1946 1947 28 22 63 84 42 ¥•• ••• ~ • 79 1.24. .7'6. 1.10 1~38 ,. Rai~bo.w Brook 7.5· 7.5 10.0 10.0 10.0 10.0 7 .5 7.6 8.7 a.a 2· 60 40 60 . 60 36 64 43 57 63 • 37 . Although the number of fishermen contact~d by the wardens is not sufficient -for -definite conclusions, there were • • enough contacts to give a trend 61' fishing conditions and trout population ratios :i.n •the l~ke. , '.!;'he average catch per,man hour in -all' Colora'do·trout lakes last year was .62 trou:t; •. This would indioate that the catch per man hour of 1,38 in Ward Lake in 194? means tar better than average fishing. ' ' �.. In ~~~¥~~e;.. ~1Mt ..!Jt9~j.ngi--~~. oa,9~. z.-egpr~s .~o._ ~e~~r~n~ ... which)~p~~t~•; ·'8!1!, Ji~~: ~t JrP}ll ._had1: ~e~~. ~e -~toe~~~ !n: .·. Wartl Lale:•• no'tljing qo~la. be, ,ound that. det1ni~el-y. tavpred-. ei~liet .rii~bot,~ ~r:~i-~9-~-~ ~Ho,,,,ret~ ~he;'i~~:-~s;·~op~ssi~le; : 1 ·= by _,;.o,~:_aii~:-~u~j~q~'9ii.,~o_ rather. ~e~l7. f.iahJ~4,..,~~,1:ihere~,-tofe . ~h~uld .1'.'.eqe~ve ;. ~~,1 stooki~gs.. ot_ ,leg,1., . .•.;, . . . . . . . . .· • . . . ... trou~.,, . , . Also, the_ legal-she~ .trou, \YO"'ld not haTe to. taoe po,slble dei;~~~~~i ;, oomp~~1ti9n. with_ the·: suoke:r,a _tor food before., . • th9y- ~e ,~re~dy f'or.. ~h~ _· i'ishe~! !!J. or~,,1 .aa .llOuld try. or . tirig~~l~g!I ,pl~n~ed ili th~_ lake~:· • • • ,- : ~• l • • • • ' • Legal: sis~~ r.ai~bow~ ..are ,reg~~•ft4g,d .bec:ause -~hey did well in Ward Lake.:this •ye'-r. IQl~_ ~eQause 'they _are mor.e. suitable than, rai,e·,-~o'. ~epl ~i~e, _i_n ~he .hat~her1!. . • ~rb~~,;:~o. By C?O~tf.~;~g ~.o, Pil~11,~ 9.nl,: '.l•g,l .,ra~,bO!~·. to,; .a t~e~ YB~.r .. ~erio~-~-~t _is ·.relt_ tht,t _._4e~i~~iie .,oo~o~~•io~s_ .as to the: .~oot9s.~ •or •~-a~ i~re :or . such _a p'.olt oy_.,oan ·:be. drawn at , the =end_· or·_ thEP •thre~ 'yeti.r_s :~y .- i.tiaclying. t.ha ._,to.c:\cing . and cat~}J. teo:orcis_.,;:··1r·.•·~te ,.of .trout . .ipeoi_e.s 'an~.:Eiizea ,· .• wef~!' Jtq~k~( alld .~~. ~8 .._Ul.~a '..Qf '.~lul-~e, 'p.la~t_i~gs w_ci~~ ,:un-; ·.-... taiora1>le, it would '.be . dil'~ioult :or ·1mpo_asible .to tell . what .'.iorr~~~_ive_ stockijlg oha~e ··1;;~ JJlak~.~ ·: • '·'. . . . . .. . . ·.·' . :. " - : . ' • ' • ' • •• . Wee.th~r, . , Wat.e.i: ~~te:z:I .. Wat~r .. . INu®,r. , .,Bat.~t~u __.. Date Condit1~2iS '.?~:P:, :Temp·•.. co~df:tioris !Suokt?~-~ jA~rage_ . Cpmments .. ·· ·A-.M~ '. 'P~M9 • ·.. ' .... • Length: , June 0ver-oast- -· ... .... ... - -'Cle9r • .. ·· · · ·• · .... _.. __ ~- - •. ,... · - ~ .. ,··Wei-~· 1,'llSICall.e·a-:-·-: ·•·· s ·i-... ,.;.,1,.;..1 vo1.s a.r.e. s,30 p.u~ ••• • • ~ l y • · 11: 30_ 6._i·QO .Cle·ar ' • • • • •Suckers :w.o~ke,4 ... 6 .010~41,M,ln~ 45oy ~-4;9or. Volo5 131, 12 _ino,c,s ...~nder, ~rapJ . ._:, • • •• • • •• takeJi ,'4th. .iho~ker.,, : abou· 'tr•~-•-. • ••• ~,. Cl.ear and 10:3.0 71,30 Clear., . •· 81\1119 .Q.8 ,ab0,it.:~· 7a· 7 warm 52° _: 64° , Vol~ 5 : 88 12 _ino~eJI. . maie amalleat' ~- ' ' 8 :' • - Cl d . 'OU. 1 ._ , 9 . •. ' :. . • . . lOt.00 5:00 ··Clear· · 54·0.· · ., A.SO. • • Vol.6 . . .'. ..o !. •• - ClOU,dy, _ •-8 •QO. -e.~ 00, ,• Clear, • . o~ld·vn~. "48°.; .•6°._. Vo1.,s--·: Clear and - -,-9i0G. 5:00 • . Clear •• 10 . 00011' tre·e11.;.49C,::_'. As<f: .•.-Vol. ·s···' · 1~ at :hi°,d t .... : ,-· ·- • ,· .. .. ·Snow; ~ay- . :: .. •... 11 . and:'l.i'~ght' •. Ole&T. · · Vol. 6.. ,. ' . -· 230 , 1 3 inches_ .- • •• None... -- ~ 3 -- • caumt. Same .Al .on .6th.. ~__,... '· • • ..s1,1okel'S •• • ' .. More•.•.large, ' • . ·tl'iu.· ·betor:e~.- .. ••• •• • -Co·l~ we~~her: 8_88lll9cl 1 to sto1> r.un. ·eo1d_ !l~a,ther_ 13 inoh,s, . to stop run,•. •• ¥••~-: -· · ·· - · .. • •• • None .. •• No· runA No ·run~ .. �. • . . • . Weataer Water Water Water . : ... lumber Eatia.te-t Date Condition Temp. Temp •. Cond111iona SUokera Average COlllllfJnt■ ~ .... '.,·.:~-1-:.•. '.:· ,,:.t.~IPl:h,: 01,ar.·... ·.: .:: . :;•.-.1•.•. .~,· _,_; -:.-· :_',:-..~,4:;•t• ~ 460. Vol. 6 None ; '.!; ,-: . . Bo run 11,.,u OIUU U.L8U' ouoxe:ra OOUlCI by•paiia 64° &10.- Vol. 6 18•···· 14 Inchaa :tr,,...and probably a .. . • •• .·go~4 rm) .but d~o.ppe4 .. ·bac,k to. .:l~•:~~11 .A..U. P.M. 8100. ... · · rar·u7 14 clo.ucly;- !, .... ,..- . . ~ ': ....... .•. 16 u1ear a.na warm 64° UJ.e&I' &JUI -:IU.)U 3Si1U 16 warm 63° oomin1.9.t.da.vllqt. uJ.ear ·vol. 6 J.UIOU 13 Inohee 550 Few auokera seen Cloucly.aad 1'1 . ·. '. 18 19 8130 4:46 oool: . - . 620 540 '. . .... . . .. •. Ra.ming 11100 4180 161ddy ~4 cool 540 52° Vol. 6 . 13 Inohea Clouciy -and :.9t00 4;00 Mllddy' cold 63° 62° running. Catch re• move4 at.m1c1n1~t. . .. 12 Inohea Catch ;r•ov-ed .. at - 11:M 'D~M. . - ~ C•to~ r91110,red a.t .. Vol. 6 12 Inollea ail.'hta: _•• 20 12 Inchea ICloudy. • 23 oolcl '8tUU ~,~o !MUddy 490 600 Vol. &t 12 Inohea i'rap·molested • U Inohea malled u11. • Only iiix. t._lea &nd 12 Inob.e1 tbree:ot·~heae •• •»awned. 'out ,. '.· 101oud7.cool 101;,u 1130 ,Mua.e17 24 wind 500 ss0 Vol. ·M Clear, 26 '28 '· 2'1 28 29 warJa . :BaSO 5100 Clear 62° 154° Vol. 7 •. • . . 1c1ear, Clear· warm Vol. 'I c;a.ear warm ;°•. :• Cloud7, lltddy •• windy. Vol. 7 • c .. '. ~ • .,-, fherJ110Uter 'broken, 12 Inchea no.re,laoement •• ···.·a.va.ilabJ:e•..·. • • Very tew auoicera 11 Inohe■ ·; seen in inlet at • • • • .''11,£ht.-, a.tear. .. windy 12 Inohea .- ••. -r R~~•i-.at_,JtOO.AM •· u.1eu«17, SO windy July' .01ear • Yol~ - 7 •muaay • • ·, l warm Vol.. -., .. Clear, Mladdy 2 warm Vol.. 7 4 ~•ar,. wam V.ol. 1 ---=:....f...:=:.._-----i1,.---1--......ti~;:.,.,..:....-~ , mddy , t.2 1nokea Bou ~ i n l f . �0 it,,, _ _ • .. ' .. ' -sJ'lea~h•r Yiater- Water Water : Number Estimated' _ ~~t1 ,.Cozm,'itr~~I Jenlp~· _tebi~•'. Condirtioas ·Suoara . AV~z.'.f....:; Comments •• • ••• ••• • • A~ill. P.·Jl., ; .··n·.,: .... ·• ·-1::.. .: · :- - . , . . h '. , .. . ... ·: lb.dcly ........ .. ... ··• -·· ..... Vol,,· 6 2 14 Inohea S awned out : I , 6 8 6 • None ••.• ·,, ·11 Inches . Rained all ni ht Nona None Vol-~ 6 ..J Hone Trapping diloontimled. �. l., 'rIILE -=- II ll.<\.Tl!: "' n:: • SUPERVISO.ll1 IV.. Intrc.duot!on1 The; pri oipal job of r· .ahericu :ressa.:roh 1B to dh·· cover thoa;; •. aotors which l.imi'l; the, 1Dbors nnd poundes 0£ .filh U1 J ,:1 a.~- 26)) l.~8 f'.Ay l,. Jie11riSr Ch ~i~hories Biologist reaching the oresl 9 and ~ode elop p~aot.ioal means of overooming these 11m1··ation1. The .~cillowl21g nm:te?"ial i a aUIQlllary of princi pal limitet. on.is whioh seem apparent t the preseo.t timep reaultl5 of projGot co111plcted or in 0P5r~\tion at the p?'esent tim ;; and inva£. · ~at1ons rln V. ad for the futur. farm Wa!J.Jr Spe<Jiess lo t.im.ita.tionu Roce;rvoiro bu lt primarily for irrigatio fUldfioocf oont~ol make up tho bulk of our so~oallod ~n,1 w ·~ rl'Jo Operation for the above purpo 13 greatly lin:oi. ti'! t 1eao 1mtor nm p1;"odu.o"x- of. ,same fhh. Extr4l :f'l, otuatiou d.rnins rcmtAy ('Ions . dcre.ble portion of the natux·al food potentit>.1., m9.y intorfei:re ith natural propagntion of the nore de ir~ble apeoias and in oaBea ot oompleto dr~ down m£.Y d$Gtroy th ntir& fish populetion ie~nr Uf.ed in f'Uli:og thflee re oh~ g,d ~ith rv-oi. s in often heavily d ~ncl £iltQ eottling ~ relatively u.npro~ duotiv blanket over the 1·eu'.1Rrvoir basin and olouding the w ·er to such au e:a:te~t that gr~wth of basic plant form.a iu limitod Wav~ aotio~ in the shoal areas t~nde ta p1~k up the mnall p~rt~,ol© 1·om the botto:m and kc,«;p the watll'r in a turbid statffl , fiedimont .forming s. delta a:v the inlert during high Wl\tar levels ie aubjeot to eroai • and wash aa water leve). reoede fur ,her oontrib •~,ing to turb:\.d conditions within 'i;he r aenoir., !n -~ ~at~ra ar usually from streams oontainit1g rough tisha al owing a eontinu l i flux of undesir~ble species, Poaaibl rene~. lcdividua. or corporate owners ot these reaervoi~a ~aWlot b~ expoot d to curtail their uee for wa:d..mwn benefit •i; fl.g iou. t \U.l and .flood oontrol purpo11es " No remedy ia ;;,~ppll.rent for this l 'i.mit6rtiono 2. Limitation.. Rough f:l.ish , notably oarp ., are present in arge num rain th~ majority of Colo a do's warm ws.teroo ldu h or the fl9h pound g~ 1hich thesa waters will suppox-t ia tuen up by such ~peo eso arp are further detrimental i:n that they disturb the bottom to suoh a.n extent a11 to oonaiderably muddy the wnte~s in which they are toundo �St"Wtted 1u0.f.it1h aro h1.own to j nvii.de the nea~.;s of largCtL1outh ble.01. be.oa despite $ff.or+.TJ of. 1.he latter to 11rotsot thofr eggtij ·redu ::ing the r:)p;:odcotiou r,f bu.tHl, 1 Poesiblo Remedy. ro~~l fish ;:>op-~lntloJ1S oan b~ removed by the ua~ ot do:rris rcot, Small ) ~kop; (500 ao::-e fser. or li,aa) lend themoelve13 very l".ell to thi.3 ooutrcl menaure. The oost of dorl"is root (appro::irt:tteJ.y $2o 50 por acre foot) limits the e.ite lake or rese:r.·ol!" and the n\.ll'lbcr of wa.tors to which it may be applied. For (J,i:am.pla, a r~scr~·oir of 1,000 surfa.oe a'>•"'" and an ~vers.ge ci.epth o.t 10 fc,et. wov.ld requir" derris root oocting approxim.toly t25,ooo.oo. Possibly the greatest drawback to complete removal of rough fiah is the taot that it is uaually iinpos.Gibla i.o p.·e·v-cmt r~-outry of these apooieo through inlet stre,ll.llla or rJW'.lf'.la o Promotio~ of. public intaroijt in tho ~alatability of oarp . mi{.".ht aid in the red1.1otion of 1;his rpe<Ji~'3r, l',..lthough a pre·• judice onoe formed is diff i.c1 lt to erc.1.:e. Comme:r-o-\.o.l uo~ of those .t'ish might 1.n 't.he fnturr. 1-,r.d aomo help in this rol\poot.-. Contemplated l:beearoh. Duri1;g ;948 it b pldnned ·l;o test Ebo po13El"..bi) 1·t;y oJ' a'toi::kiDb u·i'.;l\ d~airablo sp,3olou a.ocompanie(1 by a part~al roduction of rough apecies. At Holbrook r~a~r~ voi.t·" n'!lar $.rink. att. Ut>C .S rrill b1:) made during 68.?"ly s p.-ine t ·, reduoe1 the rough fi eh popula-t ion 'by a~inir.g a,,1d u,ie of derrb in ohoal c.re... s. Following 'r;his r:-.d\\.o',iong b: ue~ill snd large~ moufYl bJ.a.ok b0.ss :t.'ingerli.ngo '11rtll b~ .1tcoke,d,. Suoeoss of' thia projeot will p:robe.b ly dop .md large-ly on the ext,,nt of n,duction aoooraplisl,ed on the· rough 1':1.llh poi;ulation.. Should. tl.i.a project prove auooesflftlla it wil:l offer a meena of imp,·oving fishing in the Jai·gor r~aervoirs where ~oats pro~ M.bit v. tote.1 removal with derria .. The gravel pit at Caddoa dam (Pa.at:,· .Lake) -:,!fare an ,;pportunitr both for oomplete reinioval of rough fiflh and the use of arti.fio1.a1 far'tl.lhors, coupled wlth ,,tooking Tlith orop-:3r speoios., 1'hiu lakoi app:-oxtmately 7) sur!'aoe aoros in EJxtont~ ia heavUy !ishod and 18 in the oentor or a ~ecreation area to bo davelopod by the UG So Anrzy Enginoors. A oar'3fv.l oheck will ba k<'lpt on th.'.3 g ~o,rth and extent 1f su~• vival of baea and blue$il1 fi11g0rJ.i:ttgr.. atock:\.ng in '.L'l 1 •ton raeervoirv near La.mu·., ai't.or it W:U! tt•ep_tod lrl.th dcrr., 'rut fallo Invet1tigc,tion is pJ.ar..n•,d in regard to thfl poas:l.bility of intn~ duoi.ng predato.r:r spf>cies (f-.1.s the pikei-perch), vhich. might control �.c~ rp f:'.nd ot~cr r ci1gh t'i~!"ar Corrcep-:mdo:ic~ wlth the Ni,~re.okc. Gn;ne und F!.sh .Dep.t>rtn.ent i ndiontds tha.t the pl:lc!:1"' ie roh is c:onflidercid &. v-alu1,.b;,.e gami, fish in their sto.t1.:1 1 and that it <',c,nt,:-ib,.itee to control of rough fbh in roaervo1.rs. 3.. I.imitation. ~erpopule.tions of gB.me .fieh 61 prinoipally crappia. p~rob 9 oat£1shp a ;1d :mni'irih11 are found ill many of our low-land roservoi:-e. 3uoh overpopu.,.ationa., o.r.ten further oxagger~ted by the presenoa of IIl.ll:::6rous rough fish~ uae ~p the availablo food supply rimply in the prooes1 of livin[ 61 allowing little or no growth. Sinoo l.Jlorensed tortility of the water oarmot be oxp~oted. 11Ulllbera must be roduc~d before satiefaotory erowth oan be hoped tor, Poaai":>la ro"llOdy. the ColorC1do G<ure and Fi.ah Commieaion a:t its Ja.n:ua.1j ~ meeting removed all limito as to aeaaon. hwra~ si~e, bag lim.itap and numbor of poloa or hooks used on tho &bo~~ upeoi~a" with the exoeption of or,ppie in Jumbo and North Storliug reoarvoira in the northea8torn part ot the atateo Re:t10Tal c,f thol'lO limits ill allow fiohor.men to re., • movo aom~ of the exoese number~ and inoroaae the average 1Jite ot ·l;hose speoidBo VIo TROUT 1~ Lim.\tat~. Fish'lng prossui-e has iuoref'.ecd ma.teria.lly during r~ount yen.rs and indiol'.tionn 11ro t.hat it will continue to be heavy., Then 1a do.riier that oontinuod intensity may reduce a~and~:..ng ndult trout populations. oapeoially in strewup to a poi!l.t wh~re na:l;ural nproduotion w:l.ll be gr~a.tly limited. Possib1o romedy. Fall oenaue oounte in hot\vily fished stroama !nilioate that tne above point of depletion hu not yet boen reached. Co~tim1ed ohooks will be necessary to cetermine when and if suoh a po:lnt is reaohed and, with fishing suooesa properly lfeigb.ed against reoroati o~ timo, reduotione in bag limite or length of 8eoaon or both 'JIJIJ.Y become necessary. 2. Limitation. Ihe na.tural produoti ity ot our trout waters ia Tow when ccmpared to we.rm ""t~ra. 'lhe latter, under optiJIIUr oond1tionn 9 may produce tram 25 to 200 pounda of f.iah annually per surtaoe acre, while the former ia ~stim.~tod to produce trom lO to 30 p~1mda per surtaoo •oroo This 11.m~tation ia better understood ll'ben it is realitod that Q stream aeotion one mile long and I'.oet wide equals one aurtace acre. et Po111:l..blo remodl .. A., Sinoe na:i;ural production ia lill'.dtedp it is i mportant th.'lt the maximwn bo JDAde of hatchery a.nd rearing pond production, to insure that a ma:ximUJll ot these fish will r~n.oh the fiahcu-nwne oreel.-, This amounts to atockiz:ig �with prop,,r 13peoicc 11:1. tha prol'er numbers and sitaa at the proper '.;ime in the moot appropriate we.t~riso (1) Speoioa. Jn7cotigatiocs oom~leted to date indioate ihat rainbows offo£ a gr~~~~r retiu-n from legnl size plants ln hetwily fhhod we.t~rn, and show ~ greator e.verage growth. O!l the othar halldQ Loch Levon trout in some watera ~£ford more f5sh from resident atocko Under present fishing preoeur~s~ it is inadvisable to plant eaotern brook t~out in high mountain streams; as they tend to develop on ovorpopulation of otuntod fiah. A Hmit ><.l number of tJQa le readings from streQJlla oontllining both uatiru1 and b1·ooke indioato a greater annval ~rowth for nati~ca& (2) liumberoo • A plant of Looh fingerlings (3"} in a now near--tie.rren rea<>r,,.oir t>howed "V·ery s&tisi"actory growth when planted a.t 50 per aurfaoe aorer lndioatiug that at lt>ast thia I\\ui,bo;- IrAY he planted in we.tors of' .:his type . (3) Siuo. Invevtigationa .lJl. C::>lor11do tUld elsenvbore show· thit little can be gainod fro~ ~lanta of small fiDger~ lings in wa.tera concai~in.g; a cnnsidor.able population of adult trout , aa i:; true of 1 ,ost Colorado trout wa4;e::-a. Su.ffioie:xt stocks uf resio.nt :ish ~re usually present to une up available food B'lppli es, and additional fin- ger lings simply spread th~ food And allow lees grall'th .for all. Exocptious are "P.litors wbioh aro barr~n or nearly a~. Fivgarlinga have p:-oven very ,niooossful in theae waters Legal eize ;?lCc\1ta hc.ve ylelc:loa good returne in wa1;ero already oorr;aiulng trl)ut populeLhlM, and while they no doubt reduoe the grorll. of resident fiah (by comp&tition tor food), they seem to be the 01uy answer to ro~intaining fair fishing in hBavily fished atream.J. (4) Time, Great~r retm·n is cons-1.atently a-:,hiaved by plants ol' lsgal site trout in atroe.rns duri.Dg the spring s.nd s1~r monthB rathol' than during the t~ll or wintoro In lakos or reoervoirs aurvival over the winter months h !!Wch greate.,. than in ntreruno, a.ud a;J;f trout which !IWBt or neooaeity be pl0.1~tod during the fall or wintor should bo plaood in la.l:cs or reaervoirso T.he frequency of' plante ne~d,~d to maintain a relativ,,ly Ulliform catch during the tish seaaon appear,s to be as .f'ollrm,ss .,. �Sm&ll et.·f,>a na,: b e-~ ,'ily f J !!h•Jd Hr.,diu::r, 11 :i. ;;c c: ,; s~.IJU' . ~1ea. d.ly f.i shed Lnrge ~':re~m~., h ':l."!!'ily fished SU!L'.11 et.z-at;ino., modc:rn.tely fia'~d :.a::.:le anc~ r8eorv-oir.s, hee.v·• 1~- .fi1heci Es.on 3 woe:.ts E'.e.ch 4 Teaks Eri.oh 6 ealul Ea.<lh 7 ,irooko F.aoh 11 weeks (5) Waters. Str..:1u,11. s Ul'YOY orcu~ duri~ 19'-+7 surveyed over '3';0?56 DJ.Hee of the larger atre~ms and 37 lal':o~ A ga.tb~ring only thr,,t pt;ygicfil dat&. which can readily be oonvertod to practical 1na..'!'lf-$eme.nts uc~. A principal purpose of thia su:-ve_y wa.~ ta oreak etroama into managemont units so that pls.1~t::ng aarl c,atoh rooof:'ds oa:n be pr:>pe:rly (.Valuatodo I!!dividt~al inveetige.tloua m,ro ma.dell e.t the request at the !U1 ~oheriea division and diatr1bution div1aion 9 on water1 whartt fvl1.ution, susp~,oted hlih r.U!I!r.er ·::;e111pc,ro.tures" eto,, rfl.iaed the queztion of siuite.blllty for ntooking with trouto Bo Coloradc t.:-out wati,ro do not as a whole l1Snd thol!U"elvoa to pbya:l.oal improvelllt"nt to in<r-·caa& natural p1·oductic:nv It: to thought that 0 wlth possible uti:us:r oxoeptions P reaearoh in this field aho~ld be limited until other means of man~gcmont have boe.~ moro f.ully d0velopoio Coo1·dine.tio:n 1,rith the fur ro1:u)uroda clivisi.a:n on the ramoval or transplanting of bor..vor in 'che interest of ,..mprov~d en1ri.., romnont £01· fhh :tu ame.11 stret\ms will no doubt reoult 1u :\.nor'!lRBe<i fia'.l produot~on. {l) ~pa,ol!!.!. Furtl-.or ot,.\dleo ar~ pla.:cne d. mostly involving tagged o: fin-c.lip~d trout, to OG~pare returns trom v~1iou1 apJoie~ planted undor i<l6ntioal conditionao Comparativ~ gr.mth -.:'ill e.lso ba chocked whttns.-,u posaibl.o .. (2) Numbero. The North Fork of the Sou-th Platt~ projeot will be con'.:li::Uod to discovori, TihrO:.l$h plaii"-a of pr-Jgreulvoly inoreas~d number~, ~r ther~ i~ a~ inportant dif£aranoe ln rotur.1s in rele.t!.on to the a tookint"; int'3nsity. Sirasa A frojeot ie plar:.nad tor plau-cine; typical high moun- t d .J. lo.k3a wi tl, trout of Vl't.rying eizes to ga1n information on t}1e e:urvi va:t by -eiz ~ tr:-iups • . rodde"'lt trout pop,1J~tiona. These J.o.kes will contdn ~hecks tiu-ough tagging and fin o Upping will be carried on in other WQteru to gather further information on thia subject., (4) 'lim:,o S:l..nco int'onn.ation OD profereble time of plant ia con.-. u derable and conol•.1sive. only do.ta incidental to other reaearch is pl~nned on thi~ subject~ �= (5) ;. 6 ... 1f&.t3r~~ foclhiiud i1vMtii;B~i".l~ 1'1111 be coxnpleted as the oo<io.oi{,,n arla-a. anc " Ul Y~;_,r fo~ be.flio physioal datR will oou.tim10 a&1 time a'ld pGri:1onnsl YiiJ..l 11low, Limitation. Popule:t.io~f.l of re• g~ flnh (flu ~k1:1ra and mitmo1r,1) and large oan.n l.baliatio trout Ei.l'(.1 r.ui!pcct.t-·"' as lim'..:c:lng fs.<?·tora in tho produc-::;ion of ·:;rQut we.tl'>rs iI! ~ctneral 1lnd trout la'.coa in particular . Analysis of eilcke1· ~to:-r.aoh contents shows tha.'i; thii, spooios utilir.es many of tbo food form.! abo, uaod by trout~ It has nev6~ been ~rcven that you.Dg euokors eeng aa ~n impo1~ant to od for trout~ The pr-.e,· 1100 of large oanni't.lalil'~t:lo trout may play an import;a:::-.t roll in the low ourvi val of fingarU.:n,g;s atoolcf:"d in b.J:tes and. x-et1ervoiro7 Possible remedy . Operation of a. temporary weir and trr.p a.t the Iii!',t to Antoro r<Jaervoir {Sout .1 fork) dudng 1947 i.I\dioatea tha.t 00.naide:r:1.ble numherc of euokiart a.nd 1£,::-go ~rout may bo rc,movod f.rom eome rea~rvoirs 1n tnia mc:anerp ~2 thos~ fish attempt th~1r spa.WDJ.ng run., Conatruc:ticu of pcrr.tWout ,r-..iira and traps a"; rosu·voi r ir.ilC11ts he.n been reooi;;,1e:o.dr.o to ;},.=, B1.1renu o! RoollUIV.\tlon~ The Fhh F.l.lld Willilife ServJ.c3 ::ionm.~ra ~ith thie recommt1ndetio,-1.~ Contamplaterl Research. /l. "f'eir 'Uld tn,.p 111 be in-'ita.lled and op~ .•ated at the inlet to An·toro rc.ac ~oir dur!.ng 1948, to ,:,onfonn. as nearly as possible to th., oriaw.:iing run of epeoiea oonct'lrrtocl. If.' 19quipmont t•.nd pe roounel ,;ill pernii~ ~ a ,i.:.m1 lll,' wei:r e.n,J. i;rnp is planned ra ... th~ inlet to ll-1!i1e rms")1·vo,.r in the uame arcmo Suckers tret:ppud in thia op~t"a.tion will be e.aliverf.ld to the Bt11.tei hatchery at Buena Vhta for uoe c.a trout f,,oc.. A flmt1.ll distr ibution tank. 11 oapa.ble of b-a:l.~ havl~d in f'. pic'k-,.1p truck,.vrill allow r smova.l of large trout to n1t11t1.·s wheii: 13 they r.e.y b~ onugh1- u Stool::... ing with me..rlcod tingerli~ .rdnbo111.:i ir. An.toro reservoir vill bl't !l. pe...-t of th:lu projoot~ aa optH·(,l,·:;io?l ot the i:a:-ap will pennit a che-"..'k en the gro'ffth 9.nd ourvlval of thla pl&iit .. If weather cotid:i.ti ~n1;1 al!c7 a.oetc.fl c..1ring the npring epe.w.n:lng ooa.eon,, 1:t ia plat:..nsd to t,ut the prc:lC1tio8biUty ct reduoi?Jg t;hi ohub P"·P ,1,,.tion of o~ o, more i:;r,w.lJ. :t.akeR ~n Not"°th Park by uae of derriao ih:i.s fia1'l 0 o. Dll!ltilber of th3 m.'\nnor f'e.r:ily,, ordine.rily spallUS llfithln la!cea w'hero fow.ld r:1tt..er thr,n me vllll~ up inlot a-t:riam1.1, 4. Lim.it.ationo Pollution 0 priucipdlj7 f1•om thf'l pr:,oont or pas~ op-,ra<' tton o"f mlnea. hae great,.~ r~i.lu~&d the prod.uotlon pot~ntial of' hundrods of miles of tro-.1t at::C! lluG in Coloradoo Few of these :stree. m1: oarry pollutant" ill au.oh a:trcsng~!L ua to lill fi.sh ou>;r;.ght a howover P food produotion in ms..cy of the"'tl wE.\tort! haB been rt.,duce,d to leas thl!.n lo% or that which could ce n<a·rM\).. ly f1,xpeoted. Possible remedy. \ihl. le -r~i>sf.\roh m».y disco~·er tho ill etfeots of po!:!ution 0 properly <tn.f'i;,rced kg'lela.tion is n£oeeeary to p.:-eventt hie evil. Under present ~olcr~1o l&w and oourt p~eoedont, it £eenu �,. .,., 7 c:. '· appr,.rellt tl .at :JollutiQn ca,.m ot bo pr~v~nted on the bi..sii, ot detrimf..lnt ~.o .t'is;1 10:Yula~:imus. Limitationo !t :.a es1:1mo.tcd t!w.t ~cve.:a.l huud!."edt of thouaand1 of Iegn.1 aj. %.ct trout ara lo-:t e.nnwi Uy iu Colorado c:v migration of theso rioh into divorsion ditoh~s. Mr. J~ok Sil:18on~ Dietriot Supervisor of Diatribution6 has c~lvagod a~ 1n9.ey as 10~500 trout (4i,800 rouui:J,s~ in one year tro'!A d1tohos in North Parko Po1i1r.il1 1 • 'Oliledy< Salvage oparatic1ru5 0 &ti ":hose oonducted by Mr. Sim~on9 m~y anv@ ~onsld~rabl~ ir.unba~a of tinh where such praoc t:l.o~ le pi,uibJ.e. liO?"rc.H'er" only a .Jmu.ll .fraotion of the total l.oc.~ could b~ pre·ventod in this mAumer.. Coote1Uplatsd reacaroho What is nended ia a aore~n which would be praotEml tor ii:etallatlo:n i, tbe av~.r-age diversion oane.l. !io a,,oh enr~en i?· known at the present timoo No definite projoot on t\ie r.n.ibjcet is 11ml' pb:i:m-ed@ otheir. tho.n to keop in.formed. of :\11•rec,t ..tgr.tlon$ cl,u-;vht"H"6 ~nd ta probo the pos8ib1litica of any de, lott whioh ruy ar,.pt&er wo#·lr.able o 6.. l,imits..tion. Jd'lrJ r=tr.oam seotion!l and lakes in trout areas art> elthet: '.rooatoc. en pr'l7a:;o propei1· cy c.ni..! pubHo access denied,, Qr are lcoa.tod on publb le,.nd 'cile;;e l'-4.oceaB th..-o~h priv&t$ holdi 1 .gs it. c".s 1ied t},e pubHc., TJise of i;heae ·r.e;tors for fis.hillg le o::'ten tar below the ~1',~ir:-d max:l.muno Ii; is t'1oug~-t i.'.:bn.t tha extent of auch litutera lTill incroaee in tho future u.nlees ~t,:.·pt are takm ·;;o allow 111orc public access in a ?i'(Ul.1lflr a-:}cept~.r.-:1.e t ,-:i all concl')rne>d:. Pooa:lble r<,nedyo U1~ !'oJ.loit'Il€, materiv.l Jnig!it ofter workable r..ecu19 ~rolieving thi; di~uatior. , e-:ren thou,-;h the subje-lt may be outeido the pr~vince 0£ :esearcho If 8~.ffioient fl.rad~ rue avsUa.ble (a.e tkrough ·the propoeod Dingle bill) the puroha-"• by tho Orme c:nd Fiah i)c.,partmont ot land atripa or per:: u- snt ~.cc ~i:. s right111 to ~retn11 ine1udlng 3trerun beds and a narrow margi.n along Ot.'.'3h bank, might bo teaoi1:le. Considerable objnotionn to a ro~nouablo prioo would no doubt be raised by ~ome :lndi vidu.nle o H•11:TeV'or., these, lands could, with few exceptions" have a high valu~ other than as aocoss to fish within the enclosed watern~ a v~lue a 1.ready VQetou ,.n the publio. In tiome oaaefl the s:treftlll bed io actu·11ly public propnrty e.t tl1e proc:nnt time, by virtue or meand.:,ring survaya DLG.d~ bei'ore priva.to pat,~nt~ visro gro.ntodo !tis unierotood thQt in r.ome o~ses publio roads (built by counties~ Foroat Zex·vi.:u,j) ~c ) orcwdng p:dve.to land have been olosod to the public. Appropdate action by the proper authorities would remody this ait~ation. �7. Limite.t.lonc Over,.,poi:ulr1tioC£1 of brc0}: trout in :many of our. higher mouix~.ain Ltre!.l.tt>.S have reaai:et' t,:,, f.i.ahori~e va.luea ot thos:e watt):re• ao fe•· fisherncn eae:ll w5.Eing to tr<'k iuto &uoh areas for a beg of 20 ot' th1is$ tleh. Possible reuledy. The dletributi.on di7ar.s;loi1 ii fonniug a stock"' ing policy 11nioh11iill prevent tho plantinz of brook trout in a~roa111~, 1..lrectd.y overpopulated with this epeoies or where su!:)h an overpopulation ~ould be likoly to d@velopo - "" �Sti.'?E GAD ABD FISH DEPAUDB! nsB RESEARCH DIVISIOll TifLEt Brief Report on IiustOB Lake - Denver C0111d;J' DAfBt llaroh 24. 19h8 SUPERVISORa IBVESflGA!Olh Bay L Bess. Supt. of Fish Research and Dis'tributloa W. L Seamaa Inroclueti9&1 Huston lake is a small• 1shallow six a.ore lake South ot Alaaeda ~venue near Val Verde SohooJ. mr. a. a. Froman of the OpldaJd.st Clu~. 1n Denver wanted a department investigation :ma4e to asoertain the des-irability ot stooldng the lake with warm-wat;er fish apeoies. Suminarya 1. lluaton lake oompriaea approximately six aoras with aa average depth of 2t fest;. Mex1mun depth sounded was 40 inches. 2. fta!", now preBGD't '.i.tt· ~he lake. as determined. by s&1:n1:ag., a.re as follows, erappie. bullheads. m1miows (Gyprim.dae). large-meuth bass (few), bluei!,11., and Oa.JJP (numerous). 3• 4- _pJI of the lake was 7•-' fhe orappias in the lake show evidenoe ot wimer•ldll. 75 dead orappies were found arom:ul the shore. Approximately 5. !he lake bottom. is mostly fine silt and mwt. There was no evidenoe 0£ aquatic vegeta'tion at this time of year. A stand ot oat-tails Qocup7 the aorth-weat corner ot the lake. 6. fhe situ.tioll ot the lake wi~hin 'the city ltad:ta is such that i t enhanoes its value as a recreational area. 6. fhe lake reportedly dried up 1D a dry year in the l"O'a. Beoommen.dations1 l. Due to the extreme shallowness of the lake• and the danger of winterkill. it is reoommeaded that zio fish other tllan oattiah be planted if' the lake retains its present level. 2. !he level of the lake oould be raised at leatrt Aree tee't by repair of several small holes in the conorete·q1ce. 3. The lake should main'baia a fairly eVGJl level as its former li&e as an irrigation reservoir is no longer needed. 4. U the dyke 1a repaired and the water level oorrespoJldingly raised. -' : -.. is t}lfought that the lake offers gcod possibilities aa a "f1Vm-wat8'"· fishing lake. In this ·event. the following proeeclure e.ould be .to~t . . :~·,c·~ �a.o. Poison the lake with derris to remove "bhe hea-vy carp popula~ion :now presento ba Fill the lake as much as possible and maintain it at a constant level o co Restock with bl.uegills • catfish. and a few bass •and crappie&o �.:: -='..::..:].~,;t~!--,'··.: 0' -. ::=s·'!,;;.'.;'.§c,~--:..;.~.,;.:-'i"'_;:,;T;.(\-~.;.,~~.:,::<.;. Antero - Reservou :: tha.D. .- ex:i.sts •i n , th1··s ·; area at · the.~ present : tl.Ille •. :~;,-::~::-~,-- -~:~Jf.}f£~~:i>·-·_· ·;. ,:;~~1a~---~:;c~~}!.:~~~~:;_~;;~~}~-~~y--,~~--,--~~;~~:~ -,~~~~:-t -=-~ ;-~:i(_~,~{~-.,. :-~. -,:~-''.:-;-~: :_· ,- <- .. ~ .:: -.:f--~~"\:~:c'~~ "j ·.:~=~~;:~ _:-~:-==~~-'-==-.[i:--:.'!":<..:·:. --_}:;::'\;2. •:~Large.: trout ~·stocked>below fhe =-r eser.v oir ;.;woula be ~· d1.1'i'icul-t··;. :·=' ,·· ·•.. ~.-:~:~:? :c-_- •• _._.,__:. • ~ •.f :,~. "'· :~ ----'~--= .a-~ s1_1.·ght :~·gradient·, . ·for. '' o-ve r '·•a .:mn e · b"$low -the- Reservoir • • / 1'.he stream , , / :_,f_ .' •: . :::··:::_··/_b~ci ·i s pr!nc.:.pa.il'y:• sand and g ravel ,ri. th sorae rubble. :: rt· is silted • • •• • in heavily. F'urt:b.er ·. study would be necessary to deterniJ.ne ·.-.nether· :or - not n....:i.tural : rep rodu_c tion·. is . .succ-essrul :in this . area. . ~ _:._several of ·the · deei\~ole·s were checked at t wo points .below t he reservoir ; The -. first · sho o1d n& ·was done about· 1/2 . mile ·below Ante.ro ..Dam where the following -tro~t ;...-~re r sco-varsd and the stornach ccnten:ts examined . in'· the "f'.ield --.v~thout the aid of· a ~croscope* :..·.. 1 1 1 I~~1i1111ij~l~lll1~lilil~~i1i~i111ij1111111111~11 BDOW027882 ·'· �,..: .. .::-•.~-..- . . ... ~ • 9 .:_Loch ·-'"" Loch • ·/· -- ,:.Loch :- 10 ,, ., ·- 20 ·: '· • 'Loch Loch .12 .. _;;:•.20 - ·:/ LOC!l • •• - •Rainbow ·:.: Loch • Loch< ~, -..·, .,.; 15 . 11 18··. ·18 :._..~ '_:~ ~:-·- -e:_. -.. ....._... ....... :.-..~..:;·· - ,:., -··-~·. · mrnmwww __;~:·•· rn.ta&JiAd&SdAM, & ~ • --::·::~-s:::~1_:;/_ -:>~,,~~:>\f:tt\'.:f~1/-· ., · .l"'.i 111£::IC.-.-........ �-,:~·: ,~ ··-~;:;~'--.i~/:> ~---~--._. ··.. : -~- .. :_,.. • ·:.: :-:-: ... - ... ,· ••The. br'ie.r'. survey· conducted. reve~led only ona £actor. .that ·would be unfavorable .to the __planting or large~trout ·from· the reservoir.in -this· section;~of ·_"stre-~; •that.!·or possible ·_.failure. to. reproduc1;/ ·succ'assfll:llY .• ..:···i;'.":---• .;·:_,: .·- .. \w,,ltl •. -: ., -.... .. ,., ... :~.{-::. �r' I. Titler II. Dater A report on the Infcrmati•n Gathered from the Study of the methods used by the Five Leading Warm Water Fish Stations visited. • April ~. '1948 III. Super.visor, IV. Investigatort R. H. Hess, .s1:1pt. of Rese&r~h and, Distribution T. M. Lynch, Wann Water Fish Teohnioia.n I V. Introduction, A t 'rip was made to Okla.homa and Texas for the purpose of study, observation, and compilation of f'ie~d notes on the rive leading we.rm wate·r fish s~ati.ons in tbia se9tion of the country. This trip was arranged by the Colorado St~te Game and Fish Department with the cooperation of Mr. Charles Fuqua, Regional S~pervisor tor the Fish and Wildlife Service, Department of the Interior, in order that the· Colorado warm water fish resources might be benefited. Since Colorado's warm water program .is still in its initial stage, the sooner the work is started in the spring the better. The ret'ore, the visit to Texas and Oklahoma had to be made before our busy season began. It was most unfortunate that the visit to these warm water fish stations was made at a time when there wa.s so little activity, The cold wea."t her was a little late in leaving that region this year, ·this . caused a. · delay in their operations. The. San Marcoe unit. wasn't delayed as muoh as the other 'u nit"s• . The S~n Angelo unit waen't delayed po much by the weather_as it was by a wata~ shortage. The stations visited were, l. The Tishomingo station ie at Tishomingo, Oklahoma, where Mr, H. C, Topel is in charge. This station has 34 surface acres for the production of warm water fish. Five men including Mr, Topel are employed full time at this unit, The fish propagated aret Large mouth blaok bass, bluegill sun• fish •nd channel catfish, This station was visited on March 23 and 24, 194,8. 2. The Fort Worth, Texas station is located just outside of the oity limits and is below the Lake Worth Dam. Mr. K. W, Morrison is the superintendent. Thirty surface a.ores are devoted to fish propagation at this station. Two other men are employed full time. This station was visited during the afternoon of March 25, 1948. The fish propagated are: Large mouth black bass, bluegill sunfish and channel catfish. �, , • • ; I. - 2 - 3. The . station located at San Maroo·s ,. Texas·; ·and within the (?ity . . liznita : of · that town, was visited during the afternoon cf March 26, . and all day of March 27, 1948. Mr. ·P. P. -Adams i~ .in 9harge of thi's · unit. · About 7 surface acres are devoted to fish propagation at this station. Two full time elilployees besi_4~a Mr • . Adams are needed for the efficient operation 9f this unit. This was the on.l y station which was on schedule with. it.s -~per.ations • . . The ··fis°h . p'ropagatecl a.re: Large mouth black bass, bluegill sun• :·, fish·; :and channel catfish. • .. ' . . . . . • ; . .... ' ;,. :· : 4 . •' The. s't ation:' 'a t A1.l-Stin, : Te;ica.s wa:s· visited on Mar.ch' 28, and during . : . : t}1e ' •nio·r•riing· ·o r March 29.,. 1948'~. • Mr. H.- ·p., : Alexanqf3i-. ~s superin• .. ..:~• ..• . tende'n t 7of ·this .- unit, , and ·has only ·rec·e n't 'ly. b.e en ass;i.gned. Be).,. • oati's e of ''th:i s ;he oduld .not f~rnisb. very much inf'o~tion about .. the station- 11.86 surface acres ·a re used for pro~~ction of fish, • ... a1.1d two full time employees besides the superintendent are needed • for its operation, ·: Th~ -fish propagated aret Large .. mouth black . . .. .. .. ,hass~ • bluegill 'sunf,ish, and: channet oatf·ish. ... . , l ., : ~~~- '~n~lc/~~a~~~~ _, • ,,. •.-~:.'.. ·.T.h~: is. \~oa.t ed,·8 · ~i~~-s south :~f ·San Angelo, .',· • , .Texas', :ancf'Mr·, R.- A•.. Pe.r,is.h ,. with .three ·other. .fu],l time employees, : : ..'' •. opera:~e this -unit·. ,Tl?,is. station We.'s vi'sited d,uring the day of ··. March 30, and : on .the morning . of Ma.rah 31,·1948,. 45 surface acres ,. ~ . ~re use~· 'f'or_- the · pr£)p~a:t~i;,~· of 1~rge · mouth b.laok. ~ass, -bluegill surifis'lr, ·and' o-hannel ..cat_f.is.h. •• • · • ,·: •• 6. ... .. _ _. ' · • . ,.. .. :7 ' A special trip wa.s made, durfr1g the le.'te -·afternoon of March 23, 1948, to the Oklahoma State H~~chery at Durant, which is a short ~istanoe from Tishomingo. The ·rea.son for this vi~it was because .. Mr. J. : M~ ·Mur·p hree is :,fi!. reoogniz:ed ~xpert on the propagation of •t ·he ·che.nnercHfish~· .The visit was i.!recommended PY Mr, Topel. The method; used: by Mr-. Murphree in ~he : ·propo.gation of these fish is fol'lowed, .. in theory,· by ali th'e '. stations ·visited. . ' . . , • ' .. .. :: The water supply for .two of _these · s~iitions ;Visited is taken from lakes by means of gravity flow. One of the sta.-t;;ions ·;takes · its water supply frolll a. s tream by means of gravity flow. The ·o ther two stations pump their water, one .from Ar'tesio.n weH . and. the. other from a stream. an E~p i~nati.o n ·o.f> ~~e • ;~P;~ t . . . _ ~ ! .,_ ! ; • • • • , · • .. • • .• i · .• • :: • ' i •. ... :-; •The 1:.~pott he:s 'been .writt~n -~q. tl1at . t _~ e vadous· phases of the subject are _gro1,1ped underi heading.s :wh:i.oh .then compl_e te ·a comparative table of the information gathefed· from. each· of' th~ water·. fish stations visited. 'warm • j • · .'. ' TECHNICAL INFORMATION A, The Tishomingo station 1. pH 7.5 2. Maximum water temperature in ponds 95° F. 3• 34 surface acres 4. Average depth of ponds 3.3 feet. 5. 10 second feet of water is available for use; 3 second feet is used daily. 6, Water source is from a ri•er. - �- 3 - 7. Water is supplied by gravity flow. 8. Supply ditch is one mile long. 9. Cost of producing one pound of f ish at this station was $2.15 for 1947.• B. The Fort Worth Station 1. pH 8.0 _2. Maximum water .t emperature in ponds 96° F. 3• 30 surfaoe acres. 4. Ave~age depth ·or ponds 3.0 feet. ·.· . • . \ ; 5. Water supply is drawn from bottom of Lt.lee Worth through an 8 inch pipe, over all length being 1/4· mile, • · • • .. .. 6. A continual flow is necessary to maintain pond level.s due to seepage. 7. Water is supplied by gravity flow • . ,, 8 •. W~ter: fr.om lake has e. maximum temperature of ao° F . :'. ' ·. ' . • 9:; pond levels. . :: ..:: . , . -~ .... : .•. _ . , ~O . . . . ga. . l. ion. .. ~ _,of water per minute is needed to maintain : \ , ·l • .. "', . , . ''~ ·, : :';q: .~ ·r~e.:se_h;·; ~¥~9s.: $'t atiQn, ••.• ·:: •• ·-:· .. ·: -·..•... {~.,. pH .~~t?i .-:~ (, ·.,.- ·: :.. · ·' . .. , ' ' ••••2~ MaxiJllUlll water temperature in the ponds 97°F. 3, 7 surface acres. ,. .. '::.: .. i . 4•~;-~ver~e '. -.d~p~_.l}.,_Qf :;ponds 3.6 feet • .· . • 5.•; V(a.t.~~ ~~.P.J?.ly,._.is f:r;om .,San -Marcos -River . 1 ... - , • • . . 9•. 'Ji. .l.0. :H.,P.,:,~},_~.o-\;_ ,r,t~·;m,o_tor ··c·en•trifugal pump ·with a 6 inch intake ,. ,: \ > -• ,-~--'., : : .: • ;a,xi4,· ~ .:5.A?,<i.l;\. df~char.ge -.p-ipe' ~r_e used to dra~ the water 20 feet : ,,_ , . _. :- . t. an_ d pµsh: <l:-~ ...9®- f-eet .•t o. t:W p>ond ·area. .• • ! '· • • .. 7. A 62 foot Artesian well is also used to ·supply several smaller ponds. 8. Electric power for pwn,p.,tng·: ..co·s:ts : -8375.00 per year. 9. Only enough water is used to maintain the pond levels . . i. 10._t . _ Tl;l~ pol'.lfls Jll.~:. Yery, t-ight.· and: ,th"e.~ is -. no seepage. • • .. U ., The . ~os~, ~f pr,o4u9j.ng.-, one·, pound:: of···:fish at this station was $7 .41 -,~ ' .... .. • • for· 1947 ~ ,., ,.. •:, · ,.·· / :. . .: .i :-; ;,, ,·:. • • 1 i' ~ -~~ ' , . ' , •• , \ . • '. ,:. t t •·. • ; , • : ' • ~•i~.._• • .. I -The . A\lstin ·St~ti~n-·-. ( : ... , , ;• 1 ·,1 ,l. <, ._. " . :::..j --~ : .,. '_.( ,;: -~; . .;•i ·•; ! .• l ; ,, "j: 1:•:~ •= ;, ,;, (~ ,, ·., '.': I., ". , ·, ,, .. • JI pii. 7.c::,·, ,· .. ·. ...., · ir· t ,., ...;: ·· •r•! ., 1. . ,•• . , .. ~., \ ' 2. ' ·Maximum water temperature in ponds 96° F. 3• . 11.8.6 ..s.urf.a<;E! ~f.t\ll• ·..,~ -....,·., ,: , ,: ,.• :J'•. ., . ,•••.. ·_'.' .. 4., . Av~tr,a,.g~;.:d1;1:p~l\ .:of: :p_ouds :-3'.·5 \-,Cee-t · ; JJ • • l ., ·:. •• : ,., • •: "·,. Vfa,..t e~...Sl-lP.Pli eg. .ir.om ·::Ar.te;s,i;ani"well,: 45'· feet deep . and 15 ·reet in :;, :i . ; .:. ' ,•· ·a:iamete·r :· · . ·, ,,., >,: 1,,;i;_.,_1-.-' · 6. A 15 h.p. electric centrifugal pump supplies 6oo gallons per . .. , .. ;_ DP::Pu:t~ -~~ e ~ed.:~ :~.i.nt_ain th~ : p.ondl '.1~ ve--1 ~. . •• . . , •. 1: 1.. A, 39._. h.ph PW.UR JS: .~Js_o:, use~; wb€m. 21'eeesse.~y~ • .. • • 8. 2000 (7.P,.M. ,.e,re .a.va·U ~ble": J.f ..neede-d,'·'· •. · ! :., l ' ..'· 9.: '. XVater., i~·:·p.~ p~d: 1/a mile t():· pond'.l are!e,.:'!1 ,::'J i . , . , ., lQ!' ,Co~.t .. ~r,. powe.~,; fpr pµJnp:j.ng. ·!·i:s $900.00 per year. • • • •• 11 ~ Well is located in river bottom area, when river· is low, the .well is also low • .. . , }?• .. .~h~ _,q~st -'f t ,Produ~ing , l ..pbund -of ~-fish'):~ 'this :_'=station is ~7.11½. J .,.' ,; ,. • • , : ._, \ ' • 1,,-J 0 1 ~ , - \ - ~- .: · . : ~ ' • ; • · t . .. ~ , • ,' • l • \ ~:~:i.~.: .. ' /._:q.~ ' ':,: .! ::.: .· ..... -~··,• :. .• ,:~ • • -~ ,I , • ~--·r ..,,.• -~·- , ..-~~,-,_· • • �-4E. The San Angelo Station l. pH 8.5 2. Maximum water temperature in ponds 93° F. 3• 45 surfaoe acres. 4. Average depth ot ponds 3.5 feet , 5. Available water 1600 G.P.M. 6. Water supplied by gravity flow through a 24 iheh pipe 6oo feet long. 7. Most of the ponds are dry this year due to lack ot water in the supply lake. 8. Cost of produoing one powid of fish at this station is $5.12. Comment on water supplyt It should be note~ that the souree of the water supply is of \.!tmost importance. The San Angelo and Fort Worth stations for instance ol:!tain their water supply trom lakes; this has proved itself detrimental to the propaga• tion of wannwater fish. Unwanted fish $pecies are brought in with the water supply and they often cause some loss among the fish being p~opagated. This is already the case in the two stat~ons cited. Both of these stations must also depend ,upon the lake levels for their water supply, This may be satisfactory provided that ,the wa.ter in the lake is used- only _for the -purpose of. supplying these units; however., when it i s used f:or other pµrposes i:t .is usual.ly the i).atchery unit_which suffers if t here is a lack of water. At the present tim~ the San Angelo station is in suoh a 1pre_dj,cament •._. POND DESCRIPTION . . The ponds of. all f!ive stations are ver:y simi.la.r i:n construction. So}lle are irregular tn. ·shape, some are round, some are obl~ng, and ·some are square. They al+ average about 3-1/2 feet in depth and all are built in a way that they slant toward the kettle and usually the kettle side of the pond is the deepest, being about 6 feet . All of the fills. or banks have been eown in grass and are wide enough for passage of a truck. Certain ponds are set aside for the brood ftsh and these are known as the brood ponds. They are usually th,e ·J ,arger ponds on the stations. The smal ler ponds afe used ~s rearing ponds because they are easily controlled and therefore can be handled better. In the spring just .before spawning time eaoh pond which is to be used as a rearing unit is prepared by .piling s0me quantit ies .of fertilizer along the edge of the pond area and then .filling the pond with water and holding it t or two weeks before any .fish .are stocked. in it. After the fish have been rear ed and removed, the pond is drained and_~llow~d to remain dry until the ..following season.. . . -· .Most of' the station _superinte~dents seem. to agree that the smaller ponds. those between 1/2 acre to 1 acre. are the best sizes for rearing tish . �- 5 One of the most important factors concerning a warm water fish pond is the location of the inlet and outlet of the pond. The outlet should be located at one end of the kettle, and 'the inlet should be located so that it flows into the kettle. The reason for such an arrangement is that during the time the fish crop is being harvested the pond must be drained and the fish are inclined to come to the areas of water flow, thus t~ey are concentrated in the kettle and maybe removed easily without undue loss. Plate l shows a drawing of a pond and plate 2 shows a drawing of a kettle. There are also several photographs of the same. 1 . The sizes of the ponds at the Tishomingo station are .75, 1.32, 1.72, .89, 1·.06,' l;Ol; •1.67 ;- l,p9, _. 2~l4, 2.98, 2,25, 2.-2 5, 1.63, .77, 3.81, 1.97, and 4 smaller ponds, totaliP.g 34 au~face acres. The i _n lets , and outlets are .. l .o oat.e d in the· 'ke"t tle-,,a-t. th~s statioh • • ' ·.• . . ., . At the rort :Worth stait,iqn most· of the ·ponds are between 1/2 and 3/4 of an acre; ,.h?'.weve·r'.~·theie;-ar.e :several 5 and 6 acre ponds whic~ bring the total to 30 surf'a'.cie · acres·,.. ,r. M:r. c:\(., ,W. Morrison, superintendent, ~tates that the larger ponds are very difficult to nandle and they get their lowest production from them. At this station the inlets and outlets are opposite, and because of this they -,have ' !1~,µn_due loss of .fish at harvest time. ' . • ·. .. .. . ,. ~ The "iiz"~s· of. the ·.pqn_d s _a.t _. the San Marcos station aret .03, .04,· .u, .13, .22, ·\3d:, '-'~21;.,58, ~6,6.,," ~-ei, .·."89, 1.10, 2.68, .22, and a few others with a total· or·7·--sµri'.ape.acz:es; · ·'The·.-inlets and outlets at this station are rather mix~d up, some ar~ in.•the· k~ttles · and some are _not. . ' . : -. .. : . . . .. : •. 'Ai' the·_-:1t<.istin: st~t-ion.,t~e _j'."o,~d.-'. ~izes aret Three .9, three .6, three 1.0, four·_.1.4·;=two :. q, .:one .8,, e,_n.d ·.orie· .4, with a total of 11.86 surface acres~ 'The inlets e:·1.1d::o,rt;).ets. _a.re °6"ons'tructed within the kettle except for . , a .few:• . . 0 ; • ' . t •• • •• • ~ -: . . . . : ' •: . '• "t . , , , .. . . At San .Angelo the-, p~~-d.,a.re.a· con~•ists of 45 surface acres with a number of ponds 3 to 5 acres and rnos·t 61' t"h1t ·ponds being 1/2 to l acre in size. Mr . Parish, the 'superintend~n~, -~e~l~ that he gets better production from a smaller pond. The inlets and outlets. -~·~:e:·~ot~~ot;ether; however, they are both on the same s~de of the ponds within 1o ·reet of :each other. Mr. Parish hopes to con~truot tne inlet ,and ·putlet in the kettle some time in the future. . • • . ~- • • • :· •' • ~ ·, :' ·,. ~~·. ,.·· .• . :' ~. .- ,,. ,: .• ....: . Rearing pond data is taken on: e~~ry pond fertilized and stocked with fish. The information included ist .. . l~ Number of fry sto~ked • _: . ·g ~- •. ~ate .fry.- stocked_; .: . , ' 3, Date ·first--·fish -remoyed ' ' ' : • ·; .'. ·: • • 5. Number of finger lings ·removed' .. · •• .. 6·; Av8r·ag-a weigh~. per. 100 fish • •·1. • ·nate p'ond d.r:a._in~cL . .. • • •••• -' 8. Number of fingerlings 'talcen· 9. Total pond production in numbers 10. Total weight. pond produced 11.- . Average weight;•- per "fish ·. 12. Percent of recovery • 4:~ ' Date · la·st fish - _rem9vE;ld �- 6 - Data taken on brood stock iat l. 2. 3. 4. 5. Species of fish stocked Number of males Number of females Date stocked Date of first spawn The description. of pens for ohal')llel catfish brooders is as followsa An area 7 x 10 feet is · tenoed with 1/4 inch mesh hardware cloth set along the edge of a slanting bank. The depth of the water should be from Oto 3 feet. A stone crook or a keg should be. placed in the cent·e r of the pond about 10 inches. .below the &urtaoe of the water. . The· size of the keg is usually 10. gal.l_ons . , ·The water in the pond ~hould be kept tresht therefore · it shoula be changed .a bout· once a week. Plate 3 ·shows a drawing or these pens . FISH PROP~GATION PROCEDURE The fish propagated at the five hatoheriea visited consists of the -large mouth black bass (Huro aalmoidea), the bluegill sunfish (Lepomis maohr ochirus), and the chann_e l catfish (Ictalurua punctatus). The methods and procedures used in the propagation of these fish at the f ive stati~ns visited were similar. Each superintendent brought forth point s that they felt are important in regard.to those persons involved in the prope.ga.:tion of warm wat·e r ~~sh. ~ome of those points are, l. The persons employed, espeoially that person in charge of a warm wa~er station, should be alert ~nd efficient at all times. 2. The· employees of a warm water station . should have the aptitude to sucoesst\lliy carry out their given jobs, ;. The employees should have an unde.rstanding of the intricate as well a.s the simple factors concerning ~he problems or propaga·tion of these fish. • THE BLUEGILL SUNFISH CYCLE All of the stations visited use about the same method ·o r oarj.1g for and using the bluegill. brood fish. The fish are stocked· at 30 pair per acre in · l or 2 ponds and this number produces all the small fish needed. The brood tish are selected by their h\~h color and their physical conditions. Sexing is difficult, however the n~ie fish usually are of a higher color than the female fish. •!, The brood pond in which bluegill are stocked must be heavily fertilized, the heavier the bloom the better. No artificial feeding is required~ ' �- 7 The bluegill spawn when tho water temperature reaches 78° F. and they will spawn a number of times throughout the season provided the pond is not over crowded. Most of the stations make a practice ot removing the small bluegills when they have re•ched the aiie or 1 inch or l•l/4 inoh and they usually get 2 or 3 spawns per season from the adult tiah. The bluegill brood atook weigh about 4 oz. and they are usually 3 to ~o other fish must be etockeq with t~e bluegill brood stock. 4 inches in length. The bluegill fry al'J ~eaoY•~ b9~ the p~nds when they have reached l to l•l/4 inch in size. They •re removed by •e ot traps, (Platea 4 and 5 show. type of traps used). The traps are usually placed near the inlet area.. At times the fish cannot be trapped and the pond must be draine,d for 'their oaptt.1re. The brood t'ish 111\.lst be then moved to another pond. THE LARGE MOUTH BLACK BASS CYCLE The brood fish are selected by their high coloration and their peyaioal conditions, The baea must weigh 7 ounoes before· ~t can spawn. Sexing or the ba,s ia vecy difficult and most of the stations do npt attempt it, but hope for the best. Usually the brood fish are selected from the larger fingerlings of a previous hAtoh. The brood tisp are ~laced in a brcod pond at so many per acre and they are well ted throughout the year; first to maintain their growth and then to fatten them for egg production, M~. Topel says. "The tatter the fish the better, is the case with we.rm water tis!-\. 11 • • Each of the stations have different methods of selecting the brood fish and different ideas "bout the numbers and sizes to stook in the brood pond. There are also di£ferent methods used in feeding the brood ,tock. At the Tishomingo station one half to one pound site fi,h are aeleoted for brood stock and stocked on a ratio of 6 females to 4 males and 100 per acre. The number of brood stock ma.intained yearly is usually 300, however this year they have 6oo. The brood fish are fed on live minnows. At the Fort W~rth station. the brood stock selected m~~t be 2•1/2 to 3 pounds and are stocked at 70 per acre with a ratio of 6 females to 4 males. The brood fish maintaine~ _on a yearly basis numbers 300. Tho brood fish are fed on bone meal and meat scraps, At the Austin station the size of the brood fish is 2 to 4 pounds and are stocked 75 to an acre with 6 fem.ales to 4 males. Their brood stock is maintained at 200, Here they are fed on chunks of whiting and mullet C-rish) which is imported from the sea coast. They feed about 200 pounds per month at .12½ p.e r pound. At the San Marcos station the brood f~eh selected must be 7 ounoos ~r more and are stocked at 70 pairs per acre, 6 females to 4 males, The number of brood fish maintained here is 250,. Here the food for the brood stock is the same as that of Austin. �- 8 At San Angelo station the size of the brood fish chosen is 1/2 to The brood stock maintained at this station numbers 300. The brood stock are fed on chunks of raw carp and s uoker. 3 pounds and stocked at 100 per acre, 6 females to 4 males. The brood bass spawn .as soon as the water temperature reaches about The incubation period lasts about 5 days or more, depending upon the water temperatures. After hatching, the fry remain on the nest until their egg sacs are absorbed, the length of time again depends upon the wate r temperatures. The male bass guards the eggs and the try until they are ·ready to leave the nest. 65° F. As soon as the fry reach 1/4 inch and their color changes from transparent to black, they begin to school-up and hover over the nest. At this time the fish culturist removes them by use of a bobinette seine and transfers them to rearing ponds. Quantitative distribution of the fry to rearing ponds is very desirable. It is accomplished as followst Count out 1000 fry, pour them into a net of bobinette, allow them to drain for 45 seconds, re• lieve weight with the hand by placing it beneath the net and transfer quiokly to a pan of water which has been previously weighed, determine their weight, and use this figure for calculating the total weight of fish with which it is desired to stock the rearing pond. The fry are stocked at a rate of 25,000 to 30,000 per acre. They are allowed to remain here until they reach about l-1/2 inches in size; they are then sorted to equal sizes and restocked at the rate of 7500 per acre in other rearing ponds. When the fish have reached the size of 4 inches they are ready for distribution. They should be ready in the early t'all. A well fertilized pond supplies all the food needed to produce these fish , however about the time the fish have reached 1-1/2 inches they need larger food organisms. At this time fertilization of the pond is stopped so that the sun's rays may reach the bottom of the pond in order that aquatic i nsect life will be given a chance to develop. The bass then use these aquat ic insects as food. If the fish get enough food, their cannibalistic tendencies will be held at a minimum. At the Tishomingo and San Angelo stations, the larger fing e rling bass (which are usually those with the most well developed cannibalistic appetites) are selected for brood fish. Fish spawnini does not occur simultaneou·s ly among all fish, the larger fish usually spawning before the smaller fish. A single female may spawn more than once. Therefore, the brood fish are chosen for equal size before a brood pond is stocked with them. As each group of equal size fish complete their spawn, the fish ~ulturist finds he has a staggered crop of young fish. This is t o an advantage because the ~ork does not all come at once, it is spread out even·l y. In a staggered crop ·such as this, the young fish are of unequal sizes and must be sorted and stocked in rearing units at an equal size or the cannibalistic tendencies might become too well developed among the larger fish . �I I - 9 All the stations visited use this method of producing fish, however Mr. Topel of the Tishomint;o station improves upon the staggered crop by delaying the spawn. In this way he can get a much larger fish production than all the other stations combined. He does not have to liJnit his distribution to a short period; but continues it over a longer time. The method used in delaying the spawn consists of removing the brooders from the brood pond to a holding tank and keeping them in the tank from several days to a week or more and then moving them back to the brood po~ds. Another procedure used by Mr. Topel is the counting and sorting table of his own invention. The table is described in the October 1~7 issue of "Progressive Fish Culturist" pages 209, and 210. This sorting table proves to be of great advantage when the try are removed for sorting and counting and restocking. THE CHANNEL CATFISH CYCLE Selection of smooth, oily, healthy-looking fish weighing from 2 to 8 pounds is the method used in procuring channel catfish brood stock. The fish a.re placed in small holding ponds and fed until spawning time which occurs about the end of May. Adult fish are fe~ dry powdered milk and other foods such as fish and meat scraps about once a week. Eaoh fish should get about 1/4 pound of food per week. Dl:lring the months of January, February and Maroh each fish should be fed cut fish such as carp, shad, or other types of fish at a rate of about 1/2 pound of food per fish per month. In sexing these fish the female is usually of a lighter color, the head is narrower than her body at its thickest part, the reproductive vent ia an oblong slit. The male is muoh darker in color and the head is slightly broader than the thickest part of the bo~y (which i s located under the dors~l fin). The male reproduotive organ comes to a sharp point and the opening lies toward the end of the tail, The brood fish are paired and placed in pens 7 by 10 feet in site which are built around the edge of a pond. The depth of the water in these pens runs from Oto 3 feet. A stone crock is placed in the center of each pen, top of the crock being from 7 to 10 inches under the surface of the water. The water in the pon~ should not be allowed to stagnate. The larger fish spawn earlier than the smaller fish: therefore they should be pai red so that the ma.le and female are of the same weight, but the male should be slightly larger . The paired fish ma.y not get along with ea.oh other and therefore should be re-paired in order to prevent them from killing each other. One male oan be used to fertilize the eggs of 2 females•- 1 female at a time , Atter female #1 has spawned her eggs and they have been hatched and removed from the nest along with the female, another female can be placed in the pen with the me.le. It usually takes a male weighing over 4 pounds to do this. �• 10 .. Spawning can be delayed by separating the males and the females. The mating habits show that the male prepares the nest while courting the female, th~s courting goes on for about 1 or 2 weeks after the brooders have been placed in the pens. When the female finally approves of the nest ehe spawns a layer of eggs inside the keg and the male pushes her aside and begins the fertilization. This process is repeated until the female has laid all of her eggs. After the female has finished her spawning the male becomes sole protector of the nest and tends the eggs ·until they are hatched. He does not permit the female to come back into the keg. The male hatches the eggs with such efficiency that it is doubtful if a better means will ever be found. If even one bad egg appears he sucks it from the batch without molesting the others. The eggs hatch in about 8 days. They are then removed from the pen. After the fry have been taken from the kegs in the spawning pens, they are transferred to troughs in which there is running water. These troughs are 12 feet long, and are of sufficient length to allow three screened gates to be placed in them. By inserting the screen gates, four staUs are maqe in the one trough, and fish are placed in three of the stalls; the one at the drain pipe end is not used. A spawn of fish is placed in each stall and are held in the se troughs for three days before they are fed, the11 they are held 8 more days but are fed during this time. The fish should receive a light feeding of egg yolk, cod liver oil, and powdered milk twice a day. One half hour after each feeding the trough should be cleaned. After the fry have been in the troughs for about 12 days they are removed to the rearing ponds. The fry should be placed in small ponds of about 1/2 acre i~ size or less. They should be stocked on an average of about 40,000 per acre. Ponds should be left dry so that larvae imect life will not have time to set in and be large enough to destroy the young fish. As soon as the fry are to be transferred, then only should the ponds be filled with water. A shelter box should be placed in the pond about 2 feet under the surface of the water. When the fis h are taken to the ponds from the troughs they are poured into the side of the screened box. The fish will use this box for a refuge and they will remain in the box all the time except when they are being fed. The fry are fed powdered dried skimmed milk and ground meat scraps and the feed should-be thrown in close to the shelter box. The feeding should be done at the same hour each day, preferably around 8 o'clock in the morning. By the time the young fish have been fed once a day for 5 months t hey will average 4 inches in length and will be ready for distribution. The young channel catfish must be protected from natural enemies such as crayfish, dragon fly larvae and water beetles. There are various control methods for such enemies. The rearing ponds should be constructed in such a manner that they can be left dry until the fry are ready to be transferred to them. The ponds should be scraped and cleaned of all vegetation in the Spring and made ready for filling. The water should be run into the pond the night before the young fish are to be planted. A small area of the pond should be sanded to a depth of 2 inches and the shelter box placed in the center and fastened to the bottom with small stakes. J �- 11 Several fine fingerling channel catfish specimens were collected at the Dur•nt, Oklahoma, fish hatchery. FERTILIZATION AND FEEDING Fertilization has several important effeots upon the life in the warm water fish pondt l. It promotes the planoton growth upon which the fish may feed •d irectly. 2. It promotes the growth of larger aquatic organisms and insect larvae upon which the fish feed. t 3. Fertilization retards the growth of undesirable weedt• The ponds are usually fertilized so that a bloom will appear ip the water. This bloom gives a greenish cloudy appearance to the water. •The heavier the bloom the better the food production; however, when the fish reach about l-1/2 inches they require larger food organisms and the fertil• ization should be stopped to allow the light rays to reach the pond bottom so that the aquatic. insect larvae may develop. So long as the fish get enough food, their cannibalistic tendencies will be held at a minimum. The Channel catfish fry and fingerling fish require more food than they can obtain from the fertilized ponds, therefore they are fed artificially on bone meal, cottonseed and soy bean meal• dried milk and ground fish or meat scraps. t Fertilization is usually a mixture of inorganic or commercial and organic substances. The inorganic fertilizer consists ot mixtures of super-phosphates. It is customary to express the fertiliting value of oonuneroial fertilizers in terms of the percentages of available nitrogen, phosphoric acids an~yotash. A fertHiter that contains 6% of nitrogen, 8% phosphoric acid, and WT> potash is known as a 6-8-4 fertilizer. Different stations need different variations of these percentages. Organic fertilizers are usually substanoea such as barnyard manures, crop residues. and. sewage sludge. Fertilization and other feeding practices used by the five hatcheries visited are listed; Tishomingo 1. A mixture of 10-5-0 Commercial fertilizer at 100 pounds per acre and l ton sheep fertiliter per a.ore is used for first application and enough to keep a bloom thereafter. �- 12 .. 2. It is applied by dumping in small piles along the edge of the pond. 3. Brood fish are fed on live minnows; channel catfish fry and fingerlings are fed on dry milk. Fort Worth 1. A mixture of 8-8-4 Commercial fertilizer at 100 pounds and 1 ton organic fertilizer per acre at first application and thereafter just enough to maintain a bloom. 2. It is applied by scattering throughout the pond area. 3• Channel catfish and brood fish are fed on bone meal and meat scraps. San Ma,rcos 1. A mixture of 12•10-4 is used here at 100 pounds to an acre, to• gather with 100 pounds of cottonseed meal per acre. 2. First application is 200 pounds per acre and thereafter about 100 pounds per week until l ton per aer.e has been reached. It is applied by dumping in a pile near the inlet of the pond. 3. Brood fish are fed chunks of whiting and mullet, while channel catfish are fed ground food of the same type. Austin l. Commercial. fertilizer of an 8-8-4 mixture is applied at 100 pounds to an acre until 1 ton has been reached. No organic fertilizer is used because it is not available. 2. Application is made by spreading fertilizer throughout the shallow areas of the ponds. 3. Whiting and mullet are used to feed the brood fish and the channel catfish. San Angelo 1. A commercial fertilizer of 10-5-5 mixture is applied at the rate of about 200 pounds at first application and then 100 pounds per week until 1 ton per acre has been reached. This station is still in .the experimental stages in finding out just what mixture will bring the best results. No organic fertilizer has been used to date. 2. Brood fish are fed on chunks of raw carp and suckers.channel catfish are fed on ground food of the same type. The carp and suckers are easy to get within this vicinity, and are very satisfactory as to food values and can be had at a minimum cost. Each station uses a chart to record the amounts of fertilizer used in various ponds and the number of applications made; also for the date the first satisfactory water bloom appeared. J �•,•I - 13 WEED CONTROL The practice of allowing the ponds to lie falJow during the greater part of the year retards the extensive growth of undesirable weeds which would occur ordinarily. There is, however, a certain amount of weed growth, regardless of the foregoing practice, e.nd control measures must be taken to rid the ponds of these undesirable weeds. All the stations visited use sodiwn arsenate Na As<>i,, for weed control. This chemical can be had in either a dry powder form3or in a liquid. It is sold under various trade names at various percentages, the liquid form is known as Atlas A which has 40% sodium arsenate content and costs around .70 per gallon per hundred gallons. Sodium arsenate is used primarily for submerged plants and if it is to be used successfully for emergent plants they must be cut below the water surface. 7 p.p.m. is the recommended rate at which this chemical should be applied to one acre of water. The San Angelo station has had some success with 2-4-D in controlling emergent plants. The mixture used here is a 10% solution which is sprayed upon the plants. The 2-4-D is mixed at a rate of l gallon to 3 gallons of kerosene. The Tishomingo station uses 20 p.p.m. of dry powdered sodium arsenate which is scattered by hand over the weed areas to be controlled, At the Fort Worth station, Atlas A is sprayed over the weed areas at the rate of 7 p.p.m. The San Marcos station uses the same amount and method for weed control, The San Angelo station and the Austin station use 8 p.p.m. of sodium arsenate powder for weed control. All the stations use "Fisheries Leaflet 4/=10" for directions on weed control. These chemicals are used with no apparent detriment to fish which are present in the ponds. The undesirable weeds which predominate at all the stations are: 1. 2. 3. 4. 5. 6. 7. 8. Ceratophyllum Cabomba Elodea Vallisneria 1zyriophyllum Potomogeton Typha Cyperaceae Submerged (coon tail) (fan wort) Submerged (water weed) Submerged (tape grass) Submerged (water milfoil) partly emergent partly emergent (pond weed) (cattail) emergent (sedge) emergent �- 14 MISCELLANEOUS INFORMATION Mr. H. C. Topel state~ that the large mouth black bass can be sexed just before spawning time. This is done by feeling the belly of a female fish just above the vent. The eggs are formed into a fork and if one rubs the belly of the fish gently, two small knobs may be felt on either side. The other superintendents do not use or know of 8:tl.Y practical method for sexing these fish. vVhile the visit was being made at the San Marcos station, time was taken to visit the new Texas State Hatchery which is under construction nearby. This station will have 95 surface acres of ponds made of type 4-D soil (heavy olay), The inlets and outlets are constructed near each other, but there will be no kettle. The water source will be from the San Marcos River. The station is being ,built upon the side of a hill 75 feet above the bed of the river, The water will have to ~e raised 75 feet and forced about · l,k mile to the pond area, Mr. P, P, Adams states that fingerling warn water fish should be dis• tributed as soon as possible in order to obtain the best results. The method for maintaining the water level at the San Marcos station consists of pumping the water from the river up to a water box located 20 feet above ~he river bottom. The box is 4 feet .square and is about 6 feet high, the bottom of the box is level with the surface level of the ponds. All the supply pipes are attached to this box and the water level of the box is built up until it is near the t9p of the boxi this causes enough pressure to force the water through the supply pipes to the farthest pond about 1/4 mile away. No more water is used· than is absolutely necessary to .maintain the levels in the ponds. The cost of operation and maintainanee takes about 2/3 of the budget allotted for the management of these stations, production costs takes about 1/3. This was found to be true in all stations visited. Each of the various stations visited have different sizes and types of distribution units. however they all use the principal of the venturi in the discharge line of the water circulating pump . Most of the superintendents feel that some standard type of distribution unit should be adopted. Mr. Topel of the Tishomingo station estimates that he can furnish the Colorado Game and Fish Department, 100,000 bass 1-1/2 inches in site. He will be able to transport them as far as Woodward, Oklahoma. They will be ready around the first of June. Mr, Parish of San Angelo station estimates that he can furnish the Colorado Grune and Fish Department 100.000 bass l•l/2 inches in size, and 100,000 channel catfish 1 to 1-1/4 inches. Due to the shortage of water at this station this year, the bass fry cannot possibly be held until the channel catfish are ready, therefore two separate trips will have to be made to obtain these fish. Mr. Parish states the best method in transporting warm water fish is to use an ordinary tank �• 15 with any type ot aerating device. No ice shoula be used, the difference in temperature of their waters and our waters will change durini the trip northward. Warm water fish can stand up to 85° F. water temperature and# as long as air is being pumped into the water, it is not likely to reach this temperature. The channel eatfishwill be passed the ballingup stage. The only difficulty that Mr. Parish ,an rorsee is that of removing the fish. Channel catfish are inclined to stick to the bottom and sides of the tanks especially in corners and some loss might occur in trying to remove them. He recommends that we should use fine screen wire baskets to hold the fish in. Mr. Parish has carried 160 pounds of fish some 300 miles in a 200 gallon tank without less, and he says that if they can be carried that far they surely can be carried into Colorado. 1-1/2 inch bass run 4 ounces per hundred, 1-1/4 inch channel catfish run about 3 ounces per hundred. Mr. Alexander at the Austin station believes that he might have a number ot extra fish and stated that he will talk it over with Mr. Fuqua about giving them to Colorado. Blue prints for the construction of the kettle, including the inlet and outlet areas, are available at the Regional Office or the Fish and Wildlife Service at Albuquerque. ' There has been some interest in introducing new fish species into the warm water areas of Colorado. It is felt that possible introduction of some predatious fish might prove of value in the control of rough fish. The pike perch (wall-eyed) Stizostedion vitreum has been suggested tor this purpose. This fish would seem ideal because not only would it act as a control measure for rough fish, but it is also an excellent food and tine game fish. During the visit made to the warm water stations, the superintendents were questioned about this fish. Mr. H. C. Topel believes that this fish is one of the best natural methods of controlling rough fish, and he recommends its introduction to any waters in need of such control. Mr~ Morrison says that these fish are very good game and food fish, and he recommends them highly. Many of the problems of rearing the warm water fish have been solved within the past few years. Now, however, the main thing is not only to raise the fish successfully, but to plant them successfully. Therefore, if further progress is to be me.de for the improvement of our warm water fishery resources, a program of experimental planting of these fish should be put into effect. However, if such a program is to be carried out, a large source of supply of warm water fish is needed. This report then, should prove of value to the future improvement of Colorado warm water fishery resources. It is based upon the faots gathered from the five leading warm water fish rearing units in this area. Plates l to 5 along with blueprints of the San Marcos and Tishomingo Stations and photographs of the various details of all the stations are on file in the Research Unit of the Grune and Fish Department. �.. .. Vo Introduction, Primarily to obcok on tre number and aige of fin clipped tieh that 1111 ght he.ve o•Jme over the Sear11au Reservoir apUl:lffe.y 9 the North Pork waa ahook~d fr9m ita ~cD~luenoo with the Poudro River to the dam. oonfluenoe tc the dam is approximately lol m.ileao From. the Two thou~aud 3~ 1oohs were fin olippcd (both v~ntrala removed) and planted tn Seatr.t'.n Rl!9"'"1:''""0il" on July 1 9 l~'T,9 along with 50 9 000 unmarked Looha the oa~~ ~iao~ A lato fall oe:nv.ls ~in ropoi:·t dated Oeoem.ber 49 1947) of the ltorth ?oz-k of tho ?01.u:lro revl."1al~d t}1t\t a eonsi iet'aole numb,,r of the fingerli~• plttD.tEid b.ot eu.mmer had oc;,m.-e OV€1l~ tM t1pill11?.yo VI o Summary1 l., ~~ Twelve fj_n c:\}.ppod Ci.eh wsre rc,cover,5d th!tt averaged 7°3 inohea :1.n length~ l total of 699 trout; were ree~ve,ed that averaged 7o9 inohea in le tho }o A tctul of 149 re.1.ubcw '¥l"Ot"e rooov(•rcd a7ore.ii;ng 7 ~8 inoheao 4o A t-;>to.l ot 550 Looha vrt-rci ,.eMVC?'t,!d t;ha-.; a.v(~raged 7 ,9 inohes in )oJ:li;thc ~a /.. ·n1J';/ heo..\i7 oor.c.ientratio:a of J.ooM <,43) ,:-u .found in the 350 y c.:rd seo1;ion b:m-:,dlately 'belNr the drun., Thie compared oloaely to the :.ll.Wlh1'r (364) rcc,,verect :in this ~ro&. laat tallo VIL Conolus.!.0:11 J. o No ~rldontia llan oM;e.1:r,~d to ind!.(1ate that nny o.ppreoia';.)le number of trout ha'"- tore ov"r ·:!:Je apillw.y eiruie the la.st aer,sua in O~O"'t11ber 111.0 2 ., A21 r•.o i!IB.rk6<l f.j :,h wn,r1 roe over 1 e:r.:oeipt in the au·ea immediately below the ro:sonoir;, it is aeol.lLWd the Loohll are not mie;rating &:c.y great e:rtent.o d.O"fftl6';rea'll to ;c, Th.E r3ddent pc:,1:rulat t1Jr. or trout bc,101' the i,es,;rvoir at the pre11snt tin.e 0 l:lUffioiGrt to oarry oo:oaiderable f'1shint; preesureo isij �VIIIo Surveya Shocking was not conducted very ~xtensively last December except in the area immediately below the dam 9 ao it was decided to take a census of the entire stroa.m from the Poudre River to the dam to determine if aey marked f'ish could be found in the areao Larger troutD not overly cr-mded 9 were found to within about 400 yards of the damo From about this point. to the dam the smaller "reser voir" Loche were reooveredo Movement of the Loews from the area il11Dl8diately below the dam was evidently negligible shtoe last Deoember 9 because no marked fish w~re reoev red lower downo 0 Al though ti ve more tv.gged fir:i h were recovered than during last yearis oensus 0 this was not regardod as indicative ot more trout having come over the spillway beoauss ot the low recovery of &hooked tisho Conditions of the stream» mainly water muddied from wading and submerged brush" made the oenaua in this section less than 50% oompleteo How~ver 9 the taot that 364 Lochs were reoovered within350 yards or the dam last December e.ncl 3!~3 were reooverod in approximately the Bame area during the present census is indicative that few fish came over the spillway in the interval sinoe no evidence of migration of marked fi3h was obtainado To check further on the movement ot the "re~ervoirn Looha 9 200 recovered immedi8.tely below the dam were tagge;d with metal ja.u· tags o There lJa& some loss {leas than 10%) of the tagged fish due to exoessive exposure to the eleotrio current coupled with handlingo 3uokers (Ca.toatom:us ~at;oatomuB griaeus) were common throughout the stream" but tenderi to congregate in osr·tain hal@s o There appear~ to be ample resident trout :1.n the North Fork below the dam to furnish average fishing .tor at. least the early part of the 1948 aeasono �0000042 I ; lo Titles Results of Fopulei.tj_on Cheok,, on Seaman Reservoir" Larimer Countyo April 9 0 1948 IIo Date, Illo Supervisor: IVo Investigators Vo Introductions Ray Ho Hessj) Supt., Resv:arch and Distribution Wo Ro Seaman In order to gain further infor:,·.-,ation on the size and growth ot the trout placed in Seaman ReservoiJ: in 19471> a gill net was set in a shallow area of th$ lake 9 and app ~··oxima.tely one hour was apent in using oonventional angling methodso The inf'or.mation gained was to augment the rocords obtained by sho,·k1ng the stream below the reser ... voir in the fall or 1947 and the sp:·ing of 1948a Vlo Summary1 lo Contents or the gill net eet ov-:.:rnight consisted of 30 white suckers, 4 longnose suckers 3 r.•.hubs 9 4 rainbow trout and l Looh Leven trouta I) Q One hour 9 s angling at the inlet of Long Draw Creek by two men resulted in one rainbow and fiv0 looh leven trout caughto The catoh per man hour was 4~o D.nd 2o0 reapactivelyo Stomach contents of the five tr0ut oaught in the gill net were exarninedo Food WEB chiefly of \nseot origin and microcrustaoeae., Remains of one l3Jlll;\ll chub wa.a r .•und in th•3 stomach of a 14 inch rainbowa Ot the 11 trout taken by gill n,Jt and. a11gUng 9 the rainbow (5) averaged 12o0 lnches i:r.1 length ;\D.d the lochs (6) averaged 805 inoheso Sonie of the loohi;; showed evidarca ot fin rot on tho peotoral tinso This helps correlate them with ··,;he hatchery finger lings stocked in 1947 9 as many of these fish ~1ad fh rot. Inorea.ae in size fz·om time of :p.lant in 1947 (July 1) to April 9s 1948 was 5=1/2 lnohes 0 which if: very good growtho The rainbow trout a.re probably ·residen.t trout f'rom. the former stream bed~ although the 8" re·inbow ooul. i be one of 7 .oOOO rainbow finger lings ple.oed in the res er 10ir later in 1947 o 1 �VIIG Investigatlon1 lo Si&oe are b~oken d01Vn as follows, One 8 inch 9 two 12 inoh 9 one 13 inch,. one 14 inoh ho 6 inch.o two 8½ inch, two 9 inoh White Suokerss Two 7 inch8 six 8 inoh,. eight 9 inch.olive 10 inch, seven 11 inch,. two 12 inch. Lorignose Suckers: One 6 inch,. two 7 1noh9 one 8 inoho Chubs1 · Throe:, 6 inoho Rainbows z Lochs t 2. Stomach contents ('l'rout) from gill net g 14n f'ema.le Rainbow 13" male Rainbow O 12• male Rainb01T 8 11 male Rainbow· 8° male Looh Midge larvae and remains of small obub ltic:1.ge larvae and large amounts or algae Numerous ooleoptera adults (terrestrial) .,. Numerous microcJ"l.istaoeae (oopepods) ° Few midge larvae and copepodso �, , le Titloa F':ieh Tret,v,r:t,g a•··d 'ra&g:l.ne; Oi;,e;ra.tiozu;i l\t A"J,t" IJ RC1Jo1·voir Spring 19t~8, Ila Datot April 29 = !b.y :t.8,, 1st,~ lilo Supc,rvi::,on lVo lnvestitatora W. R~ Soe.man V~ Introduotiona A 5a Jr 5' motal rtvr' gci:to""typo f:lah tr.:\p wid weir lfr:,ro flay n~ R~el!lp S 1pto Fil:l:i Rea,:~rch o.nd D:!.a trlbution W. Do Uoin 11 Project lHologht 1 inatall~d on the South Fork ot tho South Platte '1:/.iver above An.toro Resoi•voir o:a -~pril 29, 19480 Tllo project ,m.s a cont lnuation ot previou1 weir oporo.tions on Ant<3ro Rtlr,enoi:r to l\id 1z! il.@tsnr.ni.ns populati on trends and possible controls. VI. Summary1 lo 285 t;:-out r~re i,apturcd d11r:I.~ the weiir operatic:'!. 2o 281 Ro.inbow~ nveraGing l4-c2' inche1 in length wc~e taggod and re~ loo.aodo Thrtto ame.~,l Drool.: trr,ut 'Wero oa.ptured. ·;;a.ig~d and rei:i.eai:,$d., ;~ 82% or the F.!il.inbcu11 ~rc,:re ~o.nolos~ indioatin$ the i; pouibly in1J·i:;a.lln° tion wan too le ·,o to catch th'!! mlljori'ty of th:> 1 nl:-:bon- nm .. 4o The &hitting ! I ~ bo"!;tom :t Dd h:l..;h clobrio cc:wr;~n ot ·th@ 11trocua abov• Anturo wk~ th0 hc;ildlll(; c.;:id > in:te1nl'Ulae 01' any .,y?o 0£ tompo:re.cy weir ~J:noet im.l)oaaibleo ~:he "'"· :-r W!'\Gi1ed out t~Ot>J r ~ r.ioved &ll<l nplt1.oed ono"J nnd f iJ:>1" 1.ly ahe-.mlonod o.a :l:'!.prao·1;:loe.1 follc ,.bg tho c'!looud ·m1.shout., 5o 311 361 auokoro wol"e oaptur~d., Of thie number a l( 7~1 woro tho ,1hlte or Suoklsy auclcor op oiea mnd 1 8 610 nere Rocky Mo\l!:\it' in long-n.cr.a,d auok$rl" Tho woir wa~hout ooaur~ed at tho bebinnil!§ ot t~o ou0ker l"Wlp nd the figuro oaught ~~preaonts only~ fraction of the pote:zti~l run Tho euokor.a oauzht a.vorag•d !lbout 1005 inoh~H! in l~D~th tor the ).o:ng..nosod sp,eice and l0e5 iZlohea in 13.:.igth for th6 Suokloy specieso VII. Reco:mmondatione: lo Aft19r two coruu,outivo eonaon!l of weir tailur , 1·:; ie quite evident th."lt a temporary wo1r "rill llOt au!'fice at J!..r,':.e:o Roservoiro It the oporation ie to ba oontinuod, some 1ort of pennenont .tructure pu·t; in With engineering sur,o.i."v-.1.aion is neoflc llll :y. Thia could poa1lbly be done 1"'ith o. rook-,f.1.lled log orHbing •truaturo. 2o If n per.n.a.nent weir should bo oc~otruoted, it •ould bo ad,ioablo to ■tart trapping operations on opring spawr.ere as 100n a~ tha ioe goes off the stream &nd while there i,r.i stil] ic•1 on the r )Hrvoiro �., . C V!lio 2 _,, Investigetion The t1'"&p w..,s •1ivi ted daily,. .!. trout taggffd and re s:a '.led upa·tr~amo .fish ~ e r -moved and all the Suckers were counted as to epaoios 11.nd disposed of o .C'Ua to we·t and muddy oonditiorll ? a vehiole could not be driven closer than a mile from the trapo Thia preoluded tre.nefer of trout and removal of suckerB tor hatohery teado The lart;e qua.ntitiee of debris in the :..;i:st'\R plug up a sle.t~type weir and oauea a damming aotiono Thia increases the proasure en the weir supportli c uaiug t.lem to shift.. A break ooo· a O e.nd the eurrent washaa out undi::,r the weir :tn the sandy bottom.. Tbi.o ooourred ;_n spite of heavily wair:;hted support tripods and eand,..oo.gged lfflir slats . Washout and te.ilureu of thh typ~ a.ra 11nfortl..mP.te in trying to suooessfully oorr lato datRo Undetermined numbers ot fish go through oven while rop 1.irs are being mad"' Viith suok rs ,:-unni ng t more han 1000 a day" 1t would b poi;sible to remove 11evfiI'&..1 t ons ot rough .fish from tha ree r~oir during a aousono Ir adequate ~asults are to be ob• tainedp aome type of p~1~.anent weir !llll t be iMta-led that will with,.itand large uater fluotuit.tiona ai,nd 't:;e able "o an-.le extensive quantities of' dcbriac. A da3 to day rooo:rd of Operation J'oUO'lfa i DATE COltJIENTS V'.ATER 'l'F:MP. TROUT SUCKERS 4/29/4e - - - - - - - - - - - ~·~-----9~Wl__,1I~t-oWeir Install d 54° Fo 12 Lo Nose 'f11:csir partial l_y_v_a-sh'_e_d_p_u_,t_r_______________~-~7'i!i'Ro ~30/48 Moved to new l ~o~tion 54 51 R V lA~~-.. 52 22 R 5/ 2/48 47 LoNo 120 flo Water lOiT and clearing 52 19 R 5/. 2_/4B 20 LoNo 611 .. Co~:• 9 windy 17 R 33 LoNo 5/ _;/48 Wat Jr low and ·1ncty;-t-mter hj,g~ :oily_ _____ 1 -1(-)l_1-rfy ,,' ~.;._~--1.;- A~!'A• F.M. 2I R"" 1Jlig;htly 1:rurey ---"---.-~,.... af..,...,,Etr low - Weather cloudy 5/ 4/48 a.nd r~iny ..>4. 89 LoNo 295 W. I"5' W 1 B 12 L .. NQ ~---------1 ...1,-w=--54 10 R 13 l.oNo _...._-'----c--o-o~l-,-0·~1,.:;o_u_,d,_y_s,_1 ~t-n_,a_y______ :.-.:-----------.2,..;l.......W"""o-- 5/ 5/liB Watr;ar low UJ.d clear .?1______2_7_R_ _2_2_L_.u_._ 5/ 6/48 Cloar, windy 54 ---------- 62 R ? w. 92 Lolio 20 w. '-'5/.__7...z..k ...;._A.,__c_l~f)-B.T....:;•;i::-c_o_ld.....;~:-... _ n_d::!..y_ _ _ _ _....;5:;_o_ _ _ ___,2.,....,.R_---,:8:-=7"""L:#.._H_o_ - ~ • 9°' R •• 13 Wo _5__/_B...../4_B__W_indy, cloudyg water clear 50 1 B 51 LoNo �;,, ..... !. DATE ~ATER TEMP .. COMMErlTS Cloudy. ano tiur:r-ie_ TROUT SUCKERS L2 Wliiito 48° Fo 5R l R 2"Snot.' 42 42 -5 L.No•• ;2 fla 32 LaNo } R 25 Lofflo Clou<!l~ windy, atret'UJl. clear q2 0 Clear, warner, ~ter olGar 5L!~M • Water olear 21 L.H. ~ ffo 48 l R 31 L.. N. 50 6R ~ I 5/ 9~8 5/11/48 5/12/48 5/l4t,8 5/17/48 water clear Wa.teJ." low and olea.r Snow - cold. clou<f¥ OU co D r.lndy 9 Wsathor olear lllld windy Clear ·arm Wi ter riving and muddy ear, 1J&nll Tiater high and roil a· and uuddy - - 150 o.t '" TOTAL R Rainbow B"' Brook ti .. White Sucker L.Na• Long UoGc •~cker • 1:i w. 99 w. . 262 w.. 158 LoHo 52 l B 128 LoNo 56 54 22 R • 6W L.!i., 0 22 L.N .. 285 .a 11$1 w. 1610 Lolio • 336! Suoltera �I. Title: .l\n Initial Plan Combining the Propagation and Stocking of Fish Fry Within the Waters in Need of such stocking . !Io Date: April 30., 1948 III. Supervisor : IV. Investigator: V. Introduction: R.H. Hess, Supt. Research and Distribution - T. Mo Lynch, Warm Water Fish Technician I It is believed that a tremendous nll!ber of fish fry will be needed for stocking purposes during the next few years if the warm water fish resources of the State are to be improved. Col orado ' s present fish propagation units are inadequate for producing the future supply of warm water fish species needed for stocking purposes. New Porpagation units could be constructed to supply the needed fish, this however would prove expensive . The combination of the propagation and stocking procedure into a single operation eliminates the expense of oonstruction and maintenance of a propagation unito It also eliminates further expense in transportation of the fish . YI . Summary: For many years commercial fish culturists in the South have employed a combined propagation and rearing method in raising bass fry. The method consists of fencing off 10% of the pond area and using the pen for their brood fish. The brood fish were a llowed to spawn and care for the you..l'lg fish until the young fish left the neat. The fry, upon leaving the care of their parents, soon passed through the fence into the main pond. Using this method., a brood pen could be built upon a lake in need of stocking and a number of adult fish could be placed within the bounds of the pen for the purpose of spawningo The fry would soon pass into the adjacent waters thereby stocking the lake. The care of the brood fish and the construction of the pens would constitute the entire expenseo The brood fish would have to be protected and fed artificiallyo However. most of the brood fish could be obtained by seining the adjacent lake waters for minnows. The brood p,.ens would have to be rather large in order that the brood fish might have plenty of room for their spawning. There should be plenty of shallow water area with suitable spawning areas and deep water for hiding . The top of the pen should extend at least three feet above the water surface in order to prevent the brood fish from leaping over it. Hardware cloth of 1/4 inch mesh should prove to be the best fencing material as it will allow passage of the fry. hold the food minnows within the pen and keep out enemies . �Limitation. This plan should be considered as an experiment until It has been tried. It is quite possible that such a plan might not prove successful in all warm water areas due to biological. physical and chemical factors. VII. Discussion: This plan might prove to be an effective way to stoc·k large reservoirs provided that the brood pen area could be maintained in suitable waters. -----------------------A.; This plan could not succeed in waters supporting an over-population ot fish. The density of the fish population would have to be reduced before the plan was put into e f'fect. Stunted fish could be used to feed the brood fish. this would serve to release some of' the population density. ---- �----- I. Title: Results of the Use of a Liquid Derris Solution. II. Date: June 2, l948 III. Supervisor: IV. Investigator: V. Intro due tion: R.H. Hess, Suuerintendent of Research and Distribution T .M. Lynch, Pish TechniciD.n III. As part of the po-pula tion density reduction program at Holbrook Lake, a 2 acre slough on the northwest side was derrised with a liquid derris $Olut:Lon. The slough had an average depth of l½ ft. The water surface tanperature was 72°F. This was the second time the slough was derrised. VI. Method of Apnlication: Two gallons of solution was sprayed over the WRter surface by use of a hand pump spray unit. Tt,e application took two nours. Wave action spread the derris throughout the arE-:a. The kill was com,lete within 24 hours after a0plication. VII. Results: The estimated kill was: Carp Sunfish Suckers Catfish Total fill 887 213 293 33 1,426 13 small fish and minnows per foot along 1610 feet of shore line or 20,930 fish. 20,930 small fish The area remained toxic for 120 hours o VIII. Conmlusion: This type of derris w.ould be all right for use in smaller ponds, but it would be 'hard to_ spread in larger areas withcut some type of mechanical snray unit. �.. .,. ,.l "< JC'l ... . .. 1 !. ·J 1 . e .... i 'V I -·.... ..t. ~ ' ., or ~r~ th r ... £Wl t l-,. ; ~ .(; app .n. : ,) - or d ; <' t} \ -'i. cl~ ,C d.u > f.rd i .:, , . r· " •• ti·~ 1 ~n...·olif ping t-\.n:.. t'> tr-, 1 t~oo~;,.~ ~ 2 H .., 'J' i. ,.. ' d tor ee.eh I ) 11 :"l r ... 0 I../' ... JcH:• >!!!: • ·r .. .R'l.b'h.,". '"o r- d:.:-on.r. .. 0 .- ., I 7n P.iirt Ve, i . i ~~~ 1 .1:.,, ;h I • C lt 1:C'?I ell Ye ; fl.:a. 'l Bf.JOJ Sic ~ Sise .. ~--- Ut!l".>o-:- r:..T" ,. ....;. 100 5· ,, l l).) ~n 4., ,) _,r 7r. 8" t r. ./ ;, 11 J.01) "" 'l-;lt!i.l L6,. 7:,,, T f1l.N .. i. l ,, ,, 15/ . C!' i,, ,;:, l r I .:s ·~ - Nu,.,, c,r ,,:, -- >rs - 1 . ...- - ... ➔ ' :-' ·9 .o-i .I. .,r. .l 29 'J 6 ( •l l t t <~ +, o Oi.>.:m;:vc; s. .'t,:..u· , c, ... ., ~r co -: '"uc. n ,-1 , 1.,..,1 t , f l). t (''re. •. ,1 ... ,.. '1(~_ 'i !Ul. t-;,. • J .. •: '':''lD~ fL-.. l\;.pi. • c, \, • h •• nh ro. llJ • " Lr 1, b- il"' r l iJ tJ' , j ..., t nt-or," I., &~J-V():l.X- (, I't, Ot\l'.''£": fl ; ion: :c, Jr.ulc1.'·io"'. r ~ i.. tlr,nc~ nt. v rie 1 di ._,,~_: by t:1. ~ i .r, f -.J ._ • I .lJ. ·.2" 't '\ o-fl .... 1i,;;,:; l .., l �ru • r:, (both 1!!pci1:1a) oor:!•'·°'c1~ 8 'l'~r. :rut11:.:ns 1'i•on .6.ntc:;o(, i':oir. 'fug . . . ~·~;o 15 r r~ ~ ..2255 ,r... 20a:3 Jl~ lFii ~~ J-21e-a R ).6· f R 14 f R J-~065 ,.r.,2221 :.6 r P. J.. 2z36 (r indicates fBmalo) 16 f R J'~,2?~1 May 13 - 1/2 Iii.lo bel•.m fork oi" 12 ud.1o crool:., 10~12 mi.1011 above An1:;:,ro by stroan. S.:-orJlt or. 1;0 6, ~ !..o~ Ve:o.t.n.J. o.nd Adipoati Brook ~ 0.ar 6ft T~ggod R..-.j.nb'.H\' - o" to J/'> Pora~. nnd. /•dipot!fi I'w.nl:.c.r. r 51t trJ 9" .. ll1(;i1•:; ?,~otor~). e"ld Ad.lp!')l'l'3 O 0 QT.' "t~[;t,,ed ovur 6° l'ZA'f:i:VE Che ·v6ft, r1~ I ·c-::-----:r--w~1!;J 1 l l e;; --- Total )-1, :rnooi H:\.r.e '""~ ;;., 1.( 5:a ~tlii.Wer-·· --a-·- -e11" SiJ.c (· ~• -f tttrb ~- }9 7" 38 35 6:,, 00 t,1tal She RA:Nfl'}W !iuml.'lt ,r - - - -~- ----6- ;r. :0..0 4·• 5" t,U ~1n I 15 64 34 22 10 ~~ Sil\o -an- 243 iJun;her "''15'~ on -~ 1011 l ltt ~n lO 1511 4" -m- 1.otal 8 J. l �11 to J= ~4 ,J=J.0-:i to ,r.,,116 63 : . . i ~::1:L\;.1 o:rso 1r vby atr ~e:m~ ,-.t 1 r.-. 2 m:. . Je nt.:o Rssc,rvoir Fin·clippod as follows, • roo 1 o,. to 6° R.i.gh.t VE.ntral and .. a. pc,sa Rn.inbcw ~ O'~ to 3 1' - Ann.l and Ri~ht Ven.r l - 4'' to 6~ --- ..e,AL . ., PoctoI'a l ~n d Ad" poso Rah1bow All ~ - Over 6~ Taggod BROOl Number ·,-- Numbe)t" 66 14 1 ,- 76 ;2 0 1 19 ,!ote.1 F..AlNIJOVi Fiu Nnmbor -~- ~ 3tl :/' 4 l 222 To-!;e.1---;-- -, I.OCH LEVEN l'!umb~ s:,i:.o 2 ~ 9n 3 2 Total O·-and total a.J.l trout J. -~l!..g ret:v.z-n f'rom ~ir - 12 241 J=2U8 = 9" f R t g.; d. Mo.y 3g 19l8 l'.Jay 14 = South Ft:,rk South Pl&tte - 63 ,."a 10 .• ?. miles E.,.bove ,\ntero Raaervo:i.r by strs .w. 1200 feot of sho~kod m,.t~r Fin=elipped a follows: �Ero 1!': ·~ 0~ t,1:> 6'rl. .., F al o.!J r..11 '"' 011 i;::, .. Ji"' t.o 6" fll = Ov1c,r 6r. , ✓ L• ~ ht V H. :..r ,.1 c .,r I d.i.poaf. C ,:1 r.·,• "i ., '· ",fr,.1·•,+1•••1 •· l1~ft. i't,:rt,.,r •1 l.\nJ .'di;A)3~ ,., .A.l,r.,Ji • IA._,t .._ -.,-~ L'' 1~1}JU0el" -~-1,ho :; -t'.' ~·.; 6'" 7 4;• 24 ~ir.~ 2-;- ·y, - Siu -tf"'"""· 9'' ).0111 ~-'Ott'.]. RA:::NBON Nu,~-Sir.e ·1:~J....' -11 1!.~i 2 ~,-. ~ ,.., ,... ., 'l.Cf(;td BRO'J.!C !:i.l.t~ ~.J ~, 711 t lb .r:.. ,v, ·- .. 1 1} r ._ r.t c l ~--:~f.i;) Eur:be;· -·--15"-··~ ...7, a~ ~--- ~(·till 2r' 2 ]. LOCn IEVEN ~!1:mto1···---· Sl~c , ...:::::..-....."'111•-- t-'ff" - l 7"' 3 a~ l!fay ll • l ·-s- Sct~',..!1 l:i'or~ t,outh :'li.tte :J.'..v-cr a 1/2 ro.U(; bolo·~ Uo S,, 285 b1·tdge -~ 6-? mi lu sb n'c J.ntero RGs~rvo:ir by sti"·;u1., :nRoor Hr.i"" • • ·-· ikmher F.l,l~Bf,TT S:~ ~"' ··-·---:tlw:ib"'r -·i·- ·-2- -10-· -?.·er- 3r; !ifU 20 $3 86 (5 h" 51' 15 15 _,2._ 7. . 25 10 8'"' h 5r. 6' ~•J f ert 9r. Total. 3'' 6'~ 9·· :i.o" 296 Grs.nd total trout ~ l~05 Suoh>re ~~!'OOroub - ·voth specie_, 4 13 43 0 3 Tot,"1 -m9 �'!'Lt& teri~a c-' ai·.-o~'k1.1 l.:: s I''lau:1 i~•.,J -.i.~ he ~-= nr; • , 1103 mfil.rkod fish in th5 r;tn,wn ubo·,10 /'..ut.o;;o ':c ·-::~:i":.•i •· .~r :?. 111 IJC!'l a.f'u.a. • ~:: r can !:la ma:'..n~ain11d fl.t thir1 ui ';e in. th·~ fu'.;uro ~ m1c", cro bo ,_c :--i.."' ..t cc:n, n 1:L1g; rc3iden"; fl.nd 1.a"l(-c-5ptttc, :a ;- l)'..~ln.t.tor!.l' h1 tho r;'.;··,:,n"'"" �fillet lo Beat&lte ot Atwd}lo ftBll Poo4 GOUllU uovo u4 IJGJ.ow the &mauler Hill• lllve_. H1.tm0• hlotadoo June 15, 19J&B IIo Jl&te1· lllo ~eon, a. B. Jteea Md W. D. lt1.eta tv. ~ t o r • w. a. Seaman '.":1 Square fc,o1l ntfle oaiuple.s WGN .takoll • ..iun. '• ». ucl 11. 1948 a1tove UA4 below 1lbe . . . .lei-- MlU Oil tJ., lo ~ ' ILNVO tilveJt. flume• Oolon.do. foa nm,1ea wen tana a\1on J.50 ~ laol• *• m111 ud· ft.ft tamp.lee aboUt. 150 lards belw tho .millo ten -,loo Nl'e takea·ao& rat'U above ancl five sa,le ,00 JAN8 uove the .mllle fkoae aam,lea won tabm muler • marlJ md.to,m oon4t.Uaa ae paaell)le• encl equal· oare ·wao eaoNi.884 a a11 ·aampJ.ea. Sampllag tres vluoaaod JUll8 10 ., 1a¥ a. Bess au Jt.me 9 aad 11 by w. D. llcdll. • fta oan;,lea wen ai; all timed··s.:· the owncaa, ot w. Ro . Seamaa or la otftetal C\l&tod.f la the aa.to et Ula Gal19 mul Plah l e p ~ All maa~a 04 1'8Dtlftoationa were wade bv W. Ro Seaman. Vo leaul._m, 1'oial m&llb&• ot organisms (15 aampleoJ below mill tot.al smmb&r or oqtml.sma (15 eam,leo) above all JD 2Jie O•O• tnal VG11De c1, eam,lea) below mt.U total voJ.uiae ·(15 samples) above mill J&..71 ••··• Avenge llWiber organisms per aaaple below all 10.r; • Average mtfAbor oi-gsn1amo ,er sample above m111 Aveng• vol._. per aampla 'below alll Averase vol11me per sample ·above mlll· 17.Li7 .16 •• o. .,1 o.o. Comtertecl to p01llda per UN ot aquatio taaen rood, the above tlprea show ttlllt apprmd.me.•17 lf.3' ,._,. ot too4 eaist •1- "-ho llf.U ,er au 8.9.11 90IU1da ,er BON above tltG m&u. . aore Food. produo'bloa ... vol\we bel• tho Jllll WU OJ4r abautJ ltalt - - pro--1• above the mill. • A U.8' ot erpniema t0\1114 per lati'Vldllal sample tollaea �,..._ ~- --- ,-~ ,, .• -· ,qi - -•8' l5 ·6 7 , 8 18 11· 11 I 15· 17 a, . ,., •z_• ' ~ i 8 Ia, JO ,, I \ I , .'Pln ·a J J 11 a a' • u' 1G 16 4 i 1 ':16 10 3, J 1 l 1 1 1 a 1 l 1 l 8 j Ji a l T 1 1 15. a i 1 2 J J _.o.m,11da 16 J. 1 io •.ie:~-·· .1, •••. 0-·~·· .q.,.o. ·~ ..~-·····.... ' ...... 11 '1 6 .ie .... fll,, ,. . •f'l, OitOo .... -. •• .,,,.... 1 •- dli·::o:.o. 6 a I .' fmntllda 20 16 .18- 1 ·Jl !foll\1- I 1 1 6 ·o.ow ..Jt -~- •• •• l i 1 l l 1 11 6 1 l 1 .l 12 JI l 1 •• 1 10 1 ..... ....... •' .~--····· a' ·-~----· ..,. .... .•17 ..o. ,#1·' 0401:1 -... ·iio~o• Jlo.o. ~.... i,•' ~--•··· • ..... .. ,.a, e.o. ' •.. .ao-•••• • · O•O• "'·•.O• ••••••• - �Io title, 1DQec111on .of a lew Taillag Poaa for the Oau~ing BU II,, l'la'9n III·• lupeffiaor1 XV• Iavett'1ptG1'• Vo Introdunicmo at J~stowa. Coloradoe Jue 29a 1941 Ro Bo Hess. Sup~. Besearob Gild DisfJnlnatioa 1B • ll. tfeanum !he ·Oift.lrk~ 18.11 e.t Jat11aatmm. Oolor4do• is a n~par mill with a 90 to 100 tOD daily oapaoity. ala days a week, oa a 24 hcmr shift baaich P.l.ttea to twent.7 mea an •~lo:;9d dap(Jllti1ng upoa the work 1oa4. fbe mil uaes a notutioa prooeae with pine 011. soap emleiflGl'G• Some lead oonoemt;ra1Jea are mlllod ino14eatel to the aaloiwn tlueride pnduo'iiGZh • • sod&. ashp 1111d ey&Zd.de as reagents. fhe mlll was lnepeoted on 1!fq" 19, lSii8 by !Hr. I. Me ~ \ j " I when it was dieoowred by him tbat the raill was pollv:tillg Jame e ~ and· Left Saad Onek. lie :lntomecl \hem ot tu eituation and gave them· JG 4a1a· to COl"reot if.he collditlOllo n. IAvoe~1gation1 a,.., ur. B-. G. Ovita. mill aupcws.atend.ant, was oontaoted 29,:.1·91.I!•. :: am I aooompmiad hia on an inspaotioa ot the mill am4- ita t~·J;i,ag_· ¥@otaJ. s ~ . the uw talliaga poad o.ompr1aee aboui two aoreo aaacl will a ~ 10 .. 15 feet 1n dogtn. MG:dmum clap'th ls a.boll\ 20 ten. Su -.a ~N ·working oa the pond, and a bulldosm' ~ ~lne shovel U'ON 'bnu; OJQlo7Gd. Ocwtl&ti.on ot the pond is ez.pectecl withlza tbreo weekao . Work waa staftetl OD Jtme 4,, 1,48. Coueotlng the mill with the mw ae"'"11al ,OU ia , . ~ tee, ot fipe. the pipe is Oil Jznd,. r1m bas baa. laid 1shrough J'ameatowa 8lld burled. tho work rama:lrd mg ooaa1sts ot standpipe oouaNnioa t.a tho pond. bui141Dg ot law,.dry troughs. ud the ~ins ot 'the remintlur of too pipeliu to tho mill. It is eattimated that the ,ond will laat them tour year-a at "hotr pnoaa\ rate of milling. fhere 1a room bolar, Kor ano'bher pond. the mill will shtlt down Jui, J to~ laoli or on au will an re_. tor about we ueeta. 87 thia time, 'flhey hope to be using the uw poatl. VIIo .boommendatine1 . InaSl\lloh au this ooaaera 1s aomplpi,g 111 an eaoelleat fflllllMr with Ur. Altdrewa r,91eri0 lt is deemed iacdvlea'ble to take &XO$pt1ori to ·"81r ~ oeedlag the set tlme Ualt or ;o dqa. ftlo; have shown a very desirable willlnpees to cooperate withouii display ot 111 tilllzlg or reaonlng to haghalU'd OOBSVUotiOD mthocla. .. _,· �June 30, 1949 .ill Olney Springs Res . Investigated the growth of the bass and Bluegill stocked at this reservoir last fall (48). The Hatchery records show that the Bluegill were stocked at 2 inches, the fish average 2¼ inches on 6/30/49 The Bass were stocked at 3 inches and are now a verag ing 5½ inches. The water temperatures at this lake were; Surface 5 feet 10 feet 70.5 F 67 .5 F 64.5 F bottom. Other species taken durin the operation included; Bullhead one wt. l lb. 3 oz. 11 inches Sunfish one 6 in. ½ lb. one 9½ 11 1 lb. 2 oz. Green. Suckers one 12 inch. one 14 inch. Chub one 6 inch. Lynch-Evans �--- . lo !i•t-l•a P!:'~,c,;·.:-i; 11 j~y ?..5 tQ ;port, I. -i~:1.-?oll·.1.tion Wor:C J11ly 2'-i-D 1948 At a ::-equeet trom the Dir.ootor.-. 11.ll t1Clrden1 ..-.id Dhtriot Oh-1.ei'e Mi'.1.eid in a l:i.s;; or polluticin !fourooa in W&tera ot their r1i,epootivo c,.rotu.,o 1'hia intontntion vaa Ol'!,talor,uod 11.1 to indi- vi~ual dr~ino.g~ao Each cu.rr.~nt pollution sourQ~ ia being vi1it~d an~ in~pootod ~o t ~ ~ll<mco 'i'h~ District 7...nnd Of'i"iOG9 8t!'.ti, 'ligir1a.y Dopcirtmont and the, ClC'!nr Cr'~sk county o,;:11.,rt ho11v~ 70:''3 vioit-od to get lud c,wn-,2•1lhip e.dj~Cl!)l'lt to C:len.r Crooko 'fh~ c,ooplexity of loo&= t~fo:;:-:. M.d 01ll'?ll.irshl.;p on tru, r.:,o.:ny ).t,dq, 9 ,:>.11loito 11 and plaoer (l.l,r,.,-!J.l."! "J.OY.ltl; th\! 1:J~l."'CIITJl ~e lllt\0,0 })i:"Of,t'fJDt. slatro At rrear.in·t:, Jv.iet ut the offll0roh1r tr.om ld&.ho Spr1Dga upttJ.•oe:m to De-~~e;;TUl~ he-.e b,»an id,i,n'tif'iedo :!ndlvldual om1er c-:ir.tt..otm i,.r-ei beinc; b(){?W'!l to doti.,nr,inu th~ l1U1dom1er• • attitudo tov111.rd the ol~~ring of Clsar Crtok ~nd the etQtua ot thoir l~d in the c,vont i'hhi?Jg i2prov~s.. The poaeibUity ot fishing oaeountis on th,Jir land is bl!)ing dhcu.ueclo 2o Pollution Sourooa ao Stm$glc,r Mill (/ibovc Silver .Pl\Ullel). Pex·iodi'J inspection" of thia mill h~va bcton mad$ with rege.rd to th~ir ta.Hing di,s:posal method1 11 following an ultimatum. hs~1ed ~o them by .Mro R.- Uo And~<'-1'1£ on Mo.rah 31 41 1~89 giving them tt.ir.ee d~¥8 to rcmeccy- thoir ts.111~ ~iopoaal ay1te1mo On .J1.1.nc.: 9 0 1011 N1d 11 11 oquar$ l.'o':.l't bottora ■amploa were tn.kon ab,.J't'f.l ond belC"ff' tho mill to deter-in! ne tht, etteot ot pollu= tion on l\qnatio fcC1d organiuu in tre otrect.mo The renulta ot tho~o ~ampli::,.g~ shOW&d that produotio~ ~boTe tho mill was twioc th,t bulw t;.ie pollution souroeo �,,, ,.. ""' f_'.> Al.l. :l.n~poct,ion u:' ·;;ha clll by th<'l iirtietor ,, r'.hh Jibna.gcr" !inr. Cbtct:' ,11m'"'e War-dcti c,u Jul!.o ;or, Jl.~6 .fm.z.nd t,:1.Hi7lle 111gain bo= -tn,z nm fi:i. ,:eoi;J.y 1nt1) the c;·~cko :f:e.:::-t in Turne I" h.t\a been assigned to rn.c,.,J::~ di,. t l;v vtaunl ohr:olc-'i.'.pll on th,, .lld :u o All llvidsnc• gathered hr, heon r -,.da a.-rllilablo to Dif'triot 1\-t•i.orney Pichard Sim.~n tor 14'!;;~1 ac;tiorto 'l'h3 Commol\m,r.lth mill below ~c r getc,e ns inapeoted on 1l&y 25 by Ro Mo Andre-1:ra ,md Wo Ro S;,amano liore cooperation with re• s~rds to tnil1ngg di•poaal -mr.s eolioit~1o :'he cooperation waa net forthttom.tog anc' they •e-:t·o inel1.<1fad ~ th the threatianod I.gal aotii.:n agnb1i.'a t l-.e Smucc;l@r JJi:J,l. Owr.:w hi'? of the lc,nd "J.pQn .rhich tho R1th Uill t.,_iliDglS dURp eltiatg was founc- to be t.ro p~ao~r ol~i~z and a ?lillaito olnim belo::igi!Jf; ·l;:c, the North Am~r:l.oan Mint~ Cot11;?F~ ot lfew Yorko Th• !'ir:m :J r1 r-opx·~?lePtod tri C8uver ~y D:.~c R".<' 1r.,nc iu the Intcirat"te T:t·1.u3•t B1dgo [ .l.no~ tr.lm old t~il1;11G e.u.-,:,.p lr. ,rn.~ cf tho prino i pcr.l poUu"' t:ourc..-:,9 o:'l Clenr Croolr.,, th-, :J~::l\::·t,1 ~;;t i1~ conaid,.,rtng doing s,,n::, imprc:'i~mc.nt ':Toi·l!: o:o :ltc, I::i r·~·';urn fer thle. work 0 11. !'iishill6 e:ll"i }ment 'us c'.l.<H!1.l.:r~d.o !ho ~/.tvr..:icy '10?'0;·3,l I a offloe we.a oontaotod t~ ,i;-~t , .:r:. t-.f.r~e,.-,~.nt to ....ld.e ~.r.f ..ctc t j o:i Ntm.•'7ro..r.s r.:~UN"o root bc-ttolil. :,~p:.-,:· w~n-o t~k<in at nric,d point on 01"~.r Cre l:: to obte.1n a."!l 0Y'!lr• '\ll plr:n,urn of aquatie 'l.naeot too1i product ion in .;J,A ctre:1::u11 Md to d.eto r:.dJ.:~ the 01.,JE;>ilatiTe eff.oct upon i t 't-;y aevar~l polluti?n aourc1.;,e. 0 J~hl'.':IL"O CHUDf le, .-oro oompe.rC11d m th rHul ta obtained by a oimib.r 1 work dono in t lw 5"\me ~rea in 1~, by th.~ Uo s~ For~st SerTiooo Comparll'.!one 1Jhovmd. tht".1.t t.'ood production lw.a r-omi,.i:r1.ed s,,.pproxiwi.tcly the ,,~1110 in tl-.a atre,!Un over a Bit1V1;lll yc:;m" poriodo Jo Rf.'g.... ~ Nua1o ~ n.n~.,;fn·ed Clfl e ut. ire.~t ·., ?f t ne &t"ohitootural oosta Qt' !"'et1ab1lit:a.titlg 21 tr1ilillg d11r;q; dopoaita alol'lg Claar Creeko i'ho prislira.inri.ry 131Jt.,iw.t~ ""1Li'l fl56£l5()0o00o ThQ> 0,1~.rk~ttr honill{i; IU.ll o:',; J~st ,.>wn.0 C<,.1lor~.do 0 was inapooted on 'lb.y lS., 11·96 'Jy Ro \Jo Al.:1d··ewa o At thla t 1 i:n hs gci.v• thom 30 do.ya to r0m.3dy ·.;k.dr poll: t..\on or Jo.m--a C.rcok c �- • .., ..,' .. T'.,ff~f h:!'-r~ oom;.,l:',o,i 031:.::ellentlyO ~:n,l h.e.v0 oanatruotod a wellehlJ:1 lt _po.:ic:o 1~>'l"t1',\n ;:ieo,~maitnt~d the 1 1:,e cf 50 400 £&et of plpcJ ';o e1on-v,ot th0 mill JJ;U~h 1;he E't,·ttH:ng pondo '.!.'h~ s·t:r-c,l",•ri io t:lo, ,;i.u:/~c c,J.@u:r 1> o:.id ·:;hs tood supply io u,.pl~ .ror I\ li.w'. ti,d 1,rh (rnk.:i:rJg o .tn rntponiEe to e roqueat by the »~6111. Sportamen 11 lnoo ot .lAu'"Ango 0 ·ch:~ tJ€10k of ,iune, 211) 1948 ln\6 ape:ct itJ. m'Aking .food oo\U'ltu t\nd i,ollution h1epeiotioM on tho AniF.a~ RiTor., Dltitrict Chiet Wo.rda.np 4wron< e K:\m.€'@Y., vini t~d the Il!J.llsitoe and aoquainted Jl!.8 with collditi"ln1' in tl1.a·l; f!.relil.o S11uar6 £0-:it botton oru.!!plei woro t'.l'lk:ein c:i; varied plao•a to detormin6 ;ha 1tf£'1Nt ol pollution source,," ;::;v1denc@ eo ge.th61rod wa1 m&de e.vaUl.\hle ·t? Hro Byro:i Vo Br&.dfordg Diltrict Atton:.ay g Sixth JudlQifll .Oia·;riat, 9'!!.d to Mro Emv~ll Cobb of the Yjal;lin S;portlINna lnoo July 20 =- 22 WU r..p@nt Ul th0 .Anim.".8 c.t.rGIA aocompani«id by Chiet Gtlme War.dtt1n Rtu:n'lp Poto:u:t;ial legal 'tc•t.ion::i ·mu·e d:teousecd with the Di2triot Attorney nnd oi;h~r i:ntGlJ:Q&t,:;d paa•ticuso ~i.-.rden Roltt"'tl!l ot Sl\l tf"-. hr...e beau to~pi:ag olaa. tab on pollu tion eourc~?J :ln th{i v.pp,.1:r /.~b.xl!Br.Leo 'r:t,.<1 ain 80\U"?e ot diao0loratl,.H1 iv. t}v.- upp~r. J,rJ.mn:,e,i, i i .from t:10 p1A01!1l"' op@rattona on Or.ahe Cr~ISko 'l'hei frlt.tr·ict t;tto:ru:,y cf' the a.,11n. ii bo~ oontaotGd reg&rd• ine; r,tb~,tem:,nt~ cf thia 'lot1d:1 tiono 0 W. R,, t~iaam~.n PiBh Technician Ill. �lo fitlea lnvenlg&Uoa ot tu 0 - Spl'hga Beaenow. - u. »ate, ~ •1,, 1948 lilo &upemeort, I. -lfo •1eaa8 • Sllpti., of leseanll end Disti1Jflltloa ff• IAWsttgat.01'1 ,. ·Ho L)'aoh,. fta)l feabDloiaa III•. V• IntnduotlOni A rociuoat uaa made bJ" tho 0"'110, ~ ~ Aeaooiatd.oa a~ o~ Jpri.nsa tor a ftl"l'G7•. ot tbe,i.r reaewou tor posat.ble atooking 0~ fisho 8ummaryl Vlo •fte ns~r 1& 1o•.·*ed. 1JI tall.e \188' QDd . . . l mile·•~ ot tll0 M:WII ot Ghey spr1age. .~ ao•lsta or ft w aoroe ot gt'OUU with tour •rtaae aol"fl ot water $ll4 it t.a ue4 for. the uJ'leldd.• ot latm8 _and piNeU w11lhln W'8 'N'Wi• flie 1p1admwa ciept;n la 17 few, the ,atn,.,,. lo 4· ten. !be l•wl ls Doi at•ble• h__.,., there ta usu&Ur ever 18 toet ot watul' Sn the pond at all tlmao fhe·.wa~r wted to t11i-. "•..._~ enea fnm • artptloa ouai.. it 10 na law a emall eettlfaag buin alld • • • lllto •,u NNNOlre All llalna and outlets ue aoNSacl. !he flow ot wato.t,o alld ha the NBOffGU ls lfflaod U»aD - gravl'ty tlov. . the poml ea.a 'b$ dnlnecl 'IJo a 4 toot 181191• • ~ ~raWN ?I°,.· flten is u eballow area ia the pcmdo It is GUl"J!GtlllClecl ~~ a din dam '1hioll is taoe4 with ro.»t oa lhe ilmes- aluao ft.sh pl'eSents aN \NUllo • susftsh. all4 bv.llhoa.a, all 8]1eoloB aw NN• the 014¥ A1U&tie vegeta.tloa pnsem; wao ~ . Jd.ghe:r pl.mils an aOI '- ~ fomid pNbabl7 &le •o tho rook taobg an4 the depth of the valero Ille lake was atooke4 a ~ e>t reu• ag-o 1,J the Depa~ "1th ••·.au blueg111. ftahbg 1flMJ YOq good tor•· few pan,, _howevef..~Ji 4eollne4 ahon]¥ the~r. ftla la ·,,obab1y due • the tan tat thoro wen a.o ueaa la whloh the ft.ah oould spawn. Ro • .,., or ea,· oiJhoP rougb tlab Uf.ln tOlUSCI la the "Nft'Olri' S~~ 8J80l&s ot Jlbao.wa WON pNIOU• Ibo ap,nam.on Asaocie.tl-. vmul4 like to have ,110 .l.'florvoi~ atoo11G4 wltb tnut. u tbeJ ea.mot haw ,_.., thq wan:ta naa ad bluegill• vn Q Reo~1Jt.ou, - - . there a•e not sp.wnSq anaa press, within 'tibia na.orvolr ,oe.Glble a'llookbg with • • water .fl.sb would Ngea\ wtat Ji&a upJGDM Sa "- paste. It :Ls NOOtmneacle4 'llla'b ft.ah 'be a'8cme4 whloh mold. ~ 'fide ftahbag tor theso poQle tor a time an4 tkon netook u aeedecl. fAG po11d woul.4 be qv.lto ea,altle ot aupport;IDg ial'O\fl. �I. 'l'itlE! Invesci_~. tion of :,ul c C:.:ecl , l oca ted :n Bent Co,mty . II . D· te: Au...:,- ust ,..,: , 1 S48 I II . Snn er·vlsor : rl . :1. Hess , ,',11.') t . of Lese:11·ch ~ ....,. Di strib1ition IV. Invest i . . :, tor: T . r. . Lync 11 , F i sh Tech . I I I V .' Intro d1tc t~ ~n : The i nvest i r; t i on of' Rule r:reek r: s re ines ted by tl·e "3Gnt County C'portn,r1en , s c oc i ·ttion . Tl 1e '3norts,nen fe l t th: t r1 nro_,rfl':1 of 8tl•e!J..'U i:mpro•1r··1ent .-ird sto cl i 16 ni:u:1t pr·ov i "e _:;ood "'is .:.n~ ·11 -~ t <" cr,·r•.:; e n f t· 1i s creek . VI . Su Qry : Rul e Cr·eek ls 32 rtiles 7_on__:; :me' ls a .~cl'e ~r less • nter mi t t e 1t stren,n . ::mu,ver i.;hrou 6 hout soi· E. '?C ilc s r i ts course t.here "l.r·e )Ools ·ul1 ich 1 a in tain ° f·l i r-y st, le ~:t1cte1· level thro11._;' 011t t he yes.1·. It is t,11f,se 11ools in -.·,:,ic: the Rn1 r;,...,1.-ien ' '(; i "1te," "'tr-d , At t f' ,~ ( €'1t ti:,.e any or t:1ene "'ools nf•·or fi uovc1 f.:.q· l-i,_; ;n the • ay of :.ml • e c"s Hn d rou3h fishes . T 1 H: :"Y)Or·· s ,en uoul d l i ke the ro __;l·· fi-,r' t=- s r e· ..ovcc1 . nnc' -;· 1e f i e,'\ es ad ed to thesF pc 01° . r,ulc Cpe, 1- 1rf-l ins F, nra i r·ic • r· r;• "--id .:. •. s b ni s a e .:;ener•i-.1 ~ / e1·oced . . lt i dnte ln 1Jnnr•1· t6Pminus , ,13' r fe0 t , lo'-'<c-r· tc r1.1~nns , 40CC c>eet . 'hloc· :1 t:- er7 slo\/ c.r·cnt dnr·i - l-:i._}1 wd-,e1· period . ':i:1,r. pools ar-e 11.su l l y fo und i tho bu1cis of tl1e Rt_ ·(;; m or 'n'1ny ~ re f or-p1r d by obs tr·uc t i orts , the nools a t uni.<➔ lly t i e i J.tll of' Lhe ~ t.,.·00.n ~1e1 c.:;~ne1·all: ·tv erase c1 )OUt 3 feet dee • T 10 st~ eGri " i dth :Her·uges abo,1t 1 0 feet ;1t t'. u )£)er ter·' ~·1us •• nc1 about r-5 f eet ·1 t t e lo ·er ter•, • j_Y\. ls . Tr e w:.ite · l -~ t· e pools • s c l e1:1 to :._;r·i:: c: , is' 1 v;-i t'1 a .n1r} -:r co:-(11 t i on of tur-bidi ty . T' e .)Ot !.o t/·--ie is s a ~c3 , !" il t , ud, an' r 1J'-bic • •-.1.; e is a'ounc1fnt <> s are l·ii..;' e • 0Lu1ts . - Fis'1 ur·esent; r·e ')'111 ea<ls , c r,, s,1.cl.·e ··•f' , i::mnfish "!.Y"t1 f'inno·,s. Tl',e ,-.ur-f'ri.ce t, per· tilre •.. ~ r-; ·:;-_:;i . ·.:.t· , ,I or 7 .c . B1.1le Gr-e ' ;,1n tics into the ,To:m ..1.rt, L.1 H6['er voir ..., i cl1 •.. 1-ien full r:·11.1sc s t he ter le c l in t11c Creel to ·ise iJl1.t.l· a, d r::..11s t' i s st ·e·,:ri ch- r:1e l it L w· tt-1• fop "i st·11c: e nf <'Olr13 ::::, ··1ile s • rr, e P is frE,C 1 ssai:;e of the f'iif1 ,,0,..,111 'tion bet"E:c • t E Sf ·vo::..r nc. 'che Cret k . M �(2 ) VII . Reco .r,1endat~.ons : 'Sinc0 t',r,re . iP free acr;es>' to t 1..,e C;.•ecl for the fish popul·--tion of ~To',., t:-~rtj_r Rf:fe'··voil·, '·he f.!..s·1 ;:)O ul tior of the Cr( (L ·rill 1)ro11Ta0 l y Je ci.eter ::.ned by t11e 0 1( se1·voir . A nu be of M' l es Pbove the rt servo ·r there i s a s "I ll d 11 ,, ero ~ s the Creek \."' ich ·,,oul d n nobab ly li ll i t t herefish -tJ· c Jo ' er p1 r t of' tbe C·zee .J,;- to t.' ,e lo r 0aPt of tr1e CrP.e' . I t is b(lieve' t' "'.t t' c ,1...,"1e1· p·U't of 1 ule vrE,ck does 1 0t '1 ve ou__;h lar,;e "'1'1 ls '')rfP.r t. to . .11cd. nt._, i n :1 wort1w . ile fish po•')ul tio , .,_ r . . fo1·e .i. t .i.s r"E:com 1e}~dcd t11r-i.t thi~ CreE'!' 0 snb j ert tc fu "ther study to c.!etor" • ne its n eeds . ' �0000047 Io Titles Rem0val of Trash Fish From Bellaire lake II o Dates September 2, l9L8 III. Supervisors Ro Ho Hess., Supto Research and Distribution IV o Investigators Vo Introduction, W o D. Klein PrevioUG investigationB indicated it "t'fOuld be advisable to Nmove the trash fiah .tl'Om Bellaire lakeo Therefore, the lake was treated with derris on September 2, 19480 VI o Summa.rys lo Salva~ing was attempted before dems was applied with negative resultso 2. Derris was applied and a heavy kill obtained at a. cost ot $79 020 for derris o • 3 • Suckers am tiger siA).ama.nders were killed in large numbers o A tew perch were ld..11edo No trout were seen. VII o Reeommenda.tions 1 l. Stock with rainbow ±'inge:rlings a.t the rats ot ,00 per surface &ere in the spring of 19h9 o 2o Close the lake to fishinc until such time ci.s the trout have reached legal size o • 3. If possible, increase the ,mter level of Bellaire lake by three feet before planting trout. V~II. Surveys Derrifl was applied to Bellaire lake in the usual manner. Tiger Sa.lamandero in various st-.e.ges of dewlopment were vary numerous. Tney ,rere affected by the z'otenone in the asme manner ns fish o Large suckers in considerable .,umbers '1nd a few perch i'JOre killed by the rotenone o No trout were eeen when tho lake was treated with de:rria J probably nom •re present. The presence or a large numbers or salamanders am a heavy growth ot free :floating algae makes it seem c1oubtf'ul that Bella.ire lake muld, at the present v:ater level, support trout the year arourxi. Maximum depth of the ll\ke a.t the present tm.ter leTel is 13 teet. It ,vould be advisable to raise the present level at least three feet before planting trout. �., 0000048 f ;vo Io Titles Removal of Trash Fi.ah From Dowd1" 14ke II. Date I SeptmJber 61 19h8 Ill o Superrii,ors R. H. Heae, Researcll a:ocl Dietribut-1.on r.v • Imes~tors W. D. Klein V. Introduoti0?1a P.re-rlous investigat1on indicated that because pt the large rmmbeNI of suckers and stunted perch 1n Do~ Lake, it would be advieable to attempt a complete kill of the trash fish betcre stocking trout. The lake was treated with derris root on September B, 1948 arx1 it 1s believed a t.otal kill was obtained at this ti.ls. VI. Smmary1 l. Tb.e lalce was drawn down from 100 surface acrea to 30 eurtaoe acres. 2. Se.lftge worit wu carried out in the lake and below the reservoir and the tw tr<>ut obtained vfl:!re transferred to Panin Lano Jo VII. The lake ms treated heavily with deni.1 root resulting in an extensive kill or ring perab. , S'Uckera and cs.rp. R&comnendations, l o Stook m.th i'(cl:\.nbow fingerllngs at the rate ot ;co per eurtaoe acN when e·l lffioient wat-sr is obu-.ined to prewnt '\'d.nter killo 2. Close the lalce to f'iBlL'lng until sum time u t.ha trout ha'98 reached l&gal sizeo VIII. Surveys Barera beg:tnn:tng salvage and d0mss1ng operation& D01ldy Beeezwir was drawn down as far :us possible• leaving td.xt7 acre feet ot water. • Some trout i,emained in the l&ke and an unsuceeest\:.l attempt was mads to seim and salvn.ge these fish o A sort mud bottom preftnted successful seining. The outlet ditch below the reservoir was seined and thirt;y trout averaging igleven inches in length were transi'ened to Parvin Lake. Derris was applied rapidly .from a moto~oa.t until fish began to die in large numbers. This method resulted in the use or 110re derri.8 than is generally considered niacesearyo Howe-rer, previous expPrience with derrls has shown that differsnt bodies or water require considerably �different concentrations ot rotemne w effect total Jdlle and it 1a difficult to determine a correct an10unt to apply. (l)serving the reaction of the fish while o.ppl,-1.ng the derris ae-ema to be the surest method of judging Ylben a sufficient amount has been applied. Although a very 1a.ree mimer of fish went, throue;b the outlet when the reservoir VAe draining, about a ton of .f'ieh rem-nned 1n the lake and were killed by t.hc demao A negligible number of trout {less than 100) ~re killed. The rough fish consisted principall.7 of 'White suckers, lone nosed suckers and ring perch under tour inches in length.. A fev; 1arga carp ,aere also killed. The darris expended in this operation cost $1,4.00. or ooune, the lake cannot be stocked until autf1o1ent water is obtained to prevent winter kill. It 1& estimated a depth of fourteen i'aet ie necessary before stocking should be attemptedo �I. Title, Fish Trappi g c'.lllu TEl.eg:t ... ,.._jerat o. Fall - 1948 II o Dates at Antero Reservoir Sept o 11 to November 9, 1948 ., Do Klein, S perviaor Ji'1ah Resoorch llI. Supervieori IV. Invostigatorss V., Introductions c .. A. eberc run w. R.. Se£mllil!1 A fish tra1> and fflllir ware installed on the South Fork of the South Platte Rf er above Antero Reservoir on September 11, 19480 The project was a continuation of previous weir oparations to detenn:1.ne the population trends, and possible IMJ:'l..agement procedures on the fallspaVJD.ing species. Return de.ta from fish tagged the previous tw trapping seasons is nclu ed. VI . Summar.yr 1. A total of %'l rout were c ueht, tagged, and releasedc Of this number., 288 trout ·'/ere trapped, and 679 were shocked by use of a portable electric ahocklnr, mA<"..hine.. Approximately 200 nu ck.era were obta:tned incident""'l to the trout operations., and were destroyed. 2a $2 Loch Leven trnu veraffing 13 .. 03 inches 1n length and 911 Brook tro t a.,,er..ir:~.ng llo 71 1nehea in length were tagged nd releaeedo 3o 1,4:53 trout have b en trappod and tago:,ed at Antaro in three ea.sons of trappingo An ~itional 220 trout to Cott.cnwood ,, e in Chaffee county .. re tagged and traruiported 4,, 72 tag returns i"rom all trapped fish have been obtaimd to date repre:::enting a ":'% ,,01unt.ary return by fiahanoon. VII.. Investigations A. The trop was visited daily" T:1e fis tagged and released upstream o vieathe were removed, and the trout The suckers were destroyed. in the laat ~ek of Octo Cold r iced- p the 1'8ir, u.d caused a wash-out rmich forced the abandonment of the trapping operation .. Difficulty ms still encountered in keeping a weir in the shiftine stream bottom at t."'ie Antero Reservoir inlet o To help combat this effect, three gra7el-f'i.l.1.ed loc cribs were const:ructed to be used next spring dur...ng the high run-orr o It is important to keep a weir functioning in the spring eo a. to have a control OVE!r the sucker populationo After two &easons of fall trapping, it is appa...'""8nt that the .tallapawniog species in the area have no definite or distinc·t peak to their spawning run.. It is a gradual upstream migration covering a period from Aueust to December" Cola Parka Wlldllfe R-■ 11rch Lib IIIII IIIII Ill llll llll llllll llll llll llll llll llll 11111111111111 111 3 2333 00000 1524 �.•- 2 An long as a b&2Tier is maintained on the st1"eam, it appeare practical to let the ma:lit:.rt fish f.O upstream to spawn, and then remove them on their return to the lake by use of the elactrice.l shocker e 'l'he returning r ish tend to congregate in large numbers in the i.l'!llllediate area above the barrier weir o ·Bo Tag return datac lo Fall 1947 returns (a) In the fall of 1947, 220 tagged brook trout were traneterred from Antero Reservoir to Cottonwood Lake in Chaffee coun~. Fifteen voluntary tag returns from this plant (608%) -were obtainado Nine or these returns showed that the fish had migrated from one to ten miles below the lake on Clottornrood C:reeko Worthy of note was one fish caught out of t.iie Arkansas Rtver at Salida, a distance of thirtyfive miles below the place of pl&.nto (b) Eleven tag rotur:rJS in 1948 were obtained from fish tagged at Antero Reservoir in the fall of 1947 o An a.dditional five fish were accounted for by trapping and shocking in the fall of 1948 for an 6% return on the total number taggado 2. Spring 19L8 returns - .38 tag returm, from 285 fish ttae:!ed in the spring of 1948, wsre obtm.md for a return of 130)%0 Seventeen ot these fiah ware caught in the stro~ £bove the resarvoir before their return f'roin their s~mtlng-runo )o Fall 1948 l"Gturm ;;.. lS tag ret·urna trom 967 trout tagged in the fall of 191'8 were obtained before the .fishing seuon eloaedo An additional 3; fish wero shocked on their return to the lake for a total ac- countability of $02%. One eight inch. brook trout fin-clipped on the Harrington Ranch, five miles above Antero neservoir in the spring of 1948, was recovered in the trap in Oetobero VIII.. Recolll!lendations 1 By continuine vreir Md trapping operations during 1949, . it is hoped that ·additional in.formation of wlue can be obtained on sucker migrations, a.nd on best methods of removing suckers from a resenoir or lake., All data that can be g~thered on trout spawning migration will be of value in Mure 1"8servoir and lake management. �Large reservoirs in trout sections of the state are becoming more numerous, and the proper fisheries management of these waters is even now a major problem. Theee reservoirs are potentially good trout lakes~ Accumulation of factual data on the fish inhabiting the reaer-.oir and thaooological factors involved is necessary before progress can be made in management, and the potential production of large reservoirs realized. �L· ,41 .._;;,, ,~-~ / . l6 /-'., '. • ~ ·:: ; / I. Titlea Survey ot Jackson Lake II. Date a September al, 191.JB III. Supervisors R.H. Hess, Supt. Research and Distribution IV. Investigator, T. M. Lynch V. Introduction: The Colorado Game and Fish Commission has reoently ~ntered into an agreement with the Morgan Conservation Club and the Bijou Irrigation Company. whereby the Commission will assume management of Jackson Lake. As part of the management plan will deal with the Fishery Resources of the Lake, a general survey waa'made to detennine the present fish popu• lation and possible action for further development. VIo Summaryt lo Jackson Reservoir is located two miles north of Goodrich, Colorado on the South Platte River. The lake has a surface area of 2,~o acres when full. It is approximately two miles long and two miles wide. The maximum depth is about 24 feet, however the lake in gen• eral is comparably shallow. At least 3/4 ot the area consists ot shoals with a. predominate bottom type of' mud and sand. 2. Water is supplied to the lake by a oanal from the river. The outlet canal supplies water for irrigation purposes. The water level of the lake, therefore is not stable. Access to the lake and bal'lk as well as boat fishing is quite simple. At the present time fishing on the lake is rather light. 3• The fish found to be present in the Lake werea Bullheads (!meiurus sp.) Abundant Yellow perch (Perea tlavesoens) Very abundant Killifish (Planoterus kansae) Common Darter (Poeciliehthys spo) Abundant Carp (Cyprinus carfio) Common Shiner (liotropis spe) Common Moat of the oarp are large and tat while both the perch and the catfish run smallo Therefore there is a possible overpopulation of both perch and catfisho 4o Algae is common and higher plants are quite abundant around the edge of the Lake. During the period when the lake is full, plants such as Bullrash. Sedge, Cattail• Potamogeton sp. are either submerged or partly so. This probably adds some fertilization to the lake. Recommendations:: In general most of our warm water lakes are in need of a predatorprey relationship in order to balance the_fish population. Therefore �artificial stocking of predator and forage fish is often recommended. Such a policy would not be possible on Jackson Lake because newly introduced try, predator or otherwise. would be consumed by the present perch populationo The yellow perch are a wholly carnivorous fisho Stunted perch populations are common as these fish will become stunted through natural over productiono The yellow perch as well as the catfish are very prolific even under extreme conditionso It is therefore recommended that some method of population re• moval be put into effect in order to rid the lake of these tisho A predator-prey relationship can then be established to improve fishing at Jackson Lake. t'l'.·-b: �~iu.-~v. r ,Jv 000004~ t-1 ~ lVo Inveatig tor: Vo Introduction: ¼ tio Do !loic liiddon Wm wa.e i!ivatti{;ati:id a.~d rcp,;.,r:o;ed on ea.,rHer thie yea.ro Gill not f.iOt$ at thf.l.t. time revealed a 1rv.cker and <,::ul• population o.nd no trouto It aeiomed advitl:lb l..i:, to ;!.ttc:n:pt; comf ·~eto rt:movr,.l of thEI tratih i'ieh in an attempt to nihnbiU•ente th lake le:..~ trcuto The lake ,.:,.n t.reo.tai.! v:-1 th er. ~;o~,1:;roir 1 pr~p'4rl\tion of: dorri.e root tJ&llod ?ishtox ,: ith excollent re:Elultno 2" Gill Ylfft sot~ r.iac1.o en ::lctob,· .- 5 9 :.s4G co.uc;ht no f'j sh indicating that the kill with FishtoA 'N1:'.a cc,·nplete or very m,a.rly ,so" 3. Fi i!hi;;o::c te ruch ~c.afo r to l.~ n,:l,:, ~\.i"'ld ~.p:,1,ll tha.~ d-,r;;-:h root and the re... .oulta it.re er.tir.e.ly ,a11.tb!'t.1otor;ro Vllo Rccointn~ndationr.: lo Stook Hiddou L~o -.h!. rr.·.hir·o":f ..d n,.::i;iv.. fina;e?· ling• at thf rate of 500 pt,r eurta-00 eon: durh:ig ::pring or: 1s-:,.90 2o Clor,e Hiddl'l::i Lr..k,) ·:;o fiahing u~.til :iv.ch tir.'4' o.r: th~ trout have reached li,gt.l oiAiot 3o Uao Fhhto:rc rlllther th::i..n derl'ia 001; ot fi.t,u.i;-e op6rationa requ.iring tr•sh fhh control 'Ft:i. th rr,te-::tono. VIII o Survoy3 Hidden LiUCe ia l9oe.ted in tho F...,utte f'ati.ona~. c:'01·est southwest of Coal= r,e lake covora ele~on surface ocree, hna ei.:1 .;.v~:-nc;t!".! derth ot fif'i;~ m !'e>t'ti" ir thirty feot d@ep ~t \ihe del!lr>0st pc.:nt .r.nd co:it .. :i.no 165 aor{'l f'eot of <l'ater<> mont at an ele'111f.ti~n ot about r◄ ,600 r~ot 0,,-1 the det~ the Fiahtoz: ~ae api:licd t·ie aur.C!•.oe temperature, wa" 66° Fo A poRo rendint of 6c8 lPd. :)e~n. obtn:tnod uu?in,c s previot.iS investigation of the l,;uc~o Thct Fhhto1. '!f"" appl·~ed at ths re:t,i o! 0:ie p11rt per mil.lion by wei&ht,, A motorboat W". 1.1,<JtJd to di <Jtribute '~l-ie major portion or the Fhhtox in the do<,per e.nas o! th~ 1:.:t~ by towl.ng wetghted .:;unny:.,a.oka or tho materie.l~ Tl-,:, aho~l ~r9~E wsrs tro~ted ~rom ~ rubbsr bo~to �Arter e.l.l tho Pishto:x had bii, n. distr~.butGd t'rlo 0h&.rgo1 of dynamite (4 etioko ea.uh) T10n aet ,,rr in t.ho ,tee;i@r ecotiono of the l a k9o Fbh b<13a.n :,howin.{_:; di,rcra,u ,t~out onCl..l'~alt hour atter abrting to apply tho Fhbtoxo Pre.otically all tho fioh ,,ere dead within twolve hours U-ter th@ Firihto."' nn.-r appUodo Tho '?er, fish remaining alive atter t ho l!lbove twelvo hou.r p~riod wero 11howing aout6 diatr•aeo lo trout were obc.ierved aa a. i"fH.tuJ.t o:1" th~ po:l.ooningo Ae indicated by the gill X!i!tt i,,at11 l'U\dtli pro'liou::iJ.:,~ ch\~bc 11 long nt)e~d auokere and white auckera we~o nu.moroumo A rough estil'IU\tG of the trash ~ish klll3d came to l 11 5t}O pou.nda or 1511500 thho Four hwld:red imd £orty pn\.1.ade or Fiflhtox wai, uoed in treating the luoo '.l'he Fishto:.,: na ot cll.inr.,c to~ .,L#]1 ll oound Md cost ei. total of $196allo A On Ootuhar 5 four .. fifty f'lo"t g1 ll ne·ce trero set overnight and caught no fiflh. Thoreforo, tt iis ~cm--1med a C'JI!lplote or very n~arly com- plete kill wa1 obt~inod. �I l II, flatei III. Supel'visor. IV. Per.aounel - Tom Lynch., i~illiam Gls21, Ernest. Streitcr., Banner Ao .Sxr.it!i, 01:i ver R. o \"il oon, '.',anien 'iiillium B ~ \'iells, Oc .obcr 26, 1948 ·e,o No~~ mber 6, 19L8 J'ick U. Simu'"'n, P:1£tM.ct Distributfo.- Super.Tisor \'Jarden Oo;'ald Cu Gillh;::-i., Wf'rden LloyG Wo Tri1 l ~+..i-., Vc Introduction: Due ti> :-cports of fish lc•ss f.'ror.: d~_::-arlrnent per3otu1el and citizens in thf, arc.:1, :-;. sal~race ope :r-'.ltio.1 was c:cnc:11ctcd to determine loss and whetb•'.lr 1-1-., ,·,tntl.d ju.st.Hy th,:, ·t.:":....."'le and cqnlpmEmt necessaryo S.1J:r,.ac" op~r-'ltions ,•;7;r-3 Gtartod Oc·';.o~cr 26, 19'~8 c 1 ~!ort,h Sterling corrt::w 1."~ ·to Oc➔ obe1. 29, 19l16, du.r:1.nt ·,:M.~h tlJtie 38,000 fish or 1,f..00 po 1.nr.!.s v,"Bro se:!.vaged nnd pJ.::-.cetl in res::-r.roirs and lakes that were L"l ·1e;.d. o:J: fish o Operai,io s w:.:..re r2sl.lll:Bd on Nc•""e:-..'ter.· 5 :i..'1:l 6 ·c'.'.t which t:i.rna 16,000 £:1st r.r O::-o P.:'u."lds .;:;re m.,J.vaged anci flr..ntcd in 1.rl:es and reservoirs t!-1at li:.'N ia n~-=?d of fish. 'l'ot .J. sal,12.r,e cf ~L~ooo fish or 2,400 lbs o VJ. I,. Equ:: P!'!G ~(t. Used :onsis ced of f 0u,. tank tz.ucln, ~a:L1ii1g nnd planting equ·'.pment, Crappie An·ch Br:iE Du..1::.hea.cJ a 2 'i:.o 10 inches :? to 10 inches 2 to 10 inches 2 to 10 inches VIJ!o Rec:.i~Ol"l~ntiorw: A p.rot~:..•-1: to sai:ly<1r.e thE:Ge out,let..-; be s.:,t, 1.!P 1o!' ~.ext year usine tlepa1·•t.r1€d-? :. per.sor.ncl anrl outs.'.!<? J abo1 H' 1wcl°!'.ssaryo Estimate that about 75_,0fJO tMo to l.,E-n inch fh/1 cr'.lld be i ...:il:.P.n en.ch yeo.r these out- let~ art:. ~nlva[:(?do It is furtter rec,:;,m;r11'.:r:C.:2d th,.,t, in thr.: future cc,mplete nnd specific a:r;~ar:rJ.-r.,r,r.t.::; rn n:;:i.de., s1..f.1:'fcic,:;.·,17;r 1.n ac.;.v"n -~ to insure that effici.mt s~i-.~re o:pe ·atio:'1, ,;;rill b0 ~·":..,ec. out durl 1c the enth"El irri~tion f.f:aoon; th,,.', is ,1 o..'.'te rach '.1€T • nr.i.ical sh•i+ !o. '!1 o At -t.h1s t,iioc ,-:oul(i l:i.k;e tc cor.-.!r!ead YJardc 1 \'dllu ..1 B. i'fells for r..is t szir,·cance in th E'S<-' sa1 vag• )})e~8t:'..'>n:3. ��IC �JJ:t- �- u �-- Average Size (inches ) Species -//) P ounds Number of Fish ~- /;( .,. {}' A2 () (/ ,--; /' ,A._ ~ /06 /~ /. / /-/I/ ,;;> // 0 /I / 7 "" /') 3 8"' , // ..... -2./ // 7 lo :i-. I. -3 COMMENTS : /f!t. . ft r(B )' JL,p , . ;t- t L .1ll �FISH SALVAGE ,. Personnel En ~ ;::;~pd;£ [:OJ; .~ 91t? ~ 13&.#~~ 'M//4 '--'A~.,~~ , ~ Species Average Size {inches '/() ..../o P ounds 73 Number of Fish �FISH SALVAGE . I(! cZ.L4L--t---£ Eguiprnent Used._ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _..;../_ -_· _ _ _ __ Ave1·age Size (inches ) P ounds /t1 ;?(tP ,!) ..3' // d"' d ~~&' /I' 38' /? ,,, ,, /£) ;l. r .,,, /t:.. C OMMEN TS : N u m b er o f Fi s h cf ,# �F ISH SALVA GE Spe cie s ~L~e A verag e S ize (i nc h e s) I( ~-t, "' G-t.~ ;, ~/-d- CO MM E N TS : 1 Numb e r of F ish P oun ds /~p-~ , oZ?,' ~ d t:J ~d /dlP o t? dl-C /J 3- t_&&O 1 a;_ .,. * �-FISH.SALYAGE NAME OF WATER_ _s_ter._lin ___g___ R_es_ervotr ___--_···_·_ _ _ _DATE ?&v' 25-29,1959 Rax Te.Uaterro ---------------- SUPERVISOR Equipment Used_ _ _'f.Yk""'r"-..,.a-n.... ev-..,.__HMla ....o,u;ik,_-.a8MlDd1,1,,a,,1],.j... n...,e,......01 ...... u .....n ...et .......a..., _ _ _ _ _ _ _ _ _ __ Dick Smith. R.otmie Lasaar. --------------------------- Personnel Engaged Average Size (inches) Species Pounds Number of Fish ' ,. -•-<•<'r•o.,,••••••'' ~-•••--~•••••- -.•.•••,••••••-•••• ...~ . , • - • • , ,.,._ .• , , ,, . . . ... GO.lyflVJ:E~'rS: _ t 1 Rex Tellateno. ReseaNh and inventory work on Sterling Resenoir,helpiDg �FISH SALVAGE -I4, 1959 NAME OF "'\'!ATE R_ __ s t"_. ,e ._....r....1._.j_n11.;c~ ....s=rv...., . ,.,.o;.=,is,:. .r _ _ _ _ __ D A T E Octob r - a:e;on . t.ruck . Pi Be.in p true • • Averagi.:: Size (inc hes) P ounds Nun1ber of Fish r.'rA\JOi P. ~- 8 J . ..Jf.. ~ T2.IQ'i PlAnted . P rch 3- 2,544 J5, 752 II 37 5, 52 II Species lhea R T,...._n+. dhad . BS 9 n,_r~ ';l.1'"1 r; ... 3 1'0 500 6- Il 4 J - COMMENTS : 1.-~+i, .......... 1 t to l E to rlanted R urn �FISH SA LVA GE NAM E OF Yl A TE R_ _-= St= = er=-=l=i=n...,g'-"-' R..:::. es:::...e::car:....;..:: v o~i ~r _ _ _ _ _ _DATE October 6- I4, I959 SUPERVISOR E. Striete:r ---------------G. ... c. fish truck . Dodge Power- ,7agon . Pi ckup truck . Hand sei nes . E quipm e nt Used ---------- - - ---------------- ---- P e rsonnel E n gag e d Rex Teli af erro . T . Lynch. D. Smith . R. Les sar• Ave rage Siz e (in c h e s) P oun d s Numb e r of Fish Cranpie 1- 8 I.uBJ I2 . I93 Planted R. Perch 3-8 2, 544 35, 752 II Bullhead 5-9 376 5, 526 ti H _'T''l"m1 +. Tr'1 - T".l, ".l,() 26 Shad 3 IO 500 . Bass - Ii * Specie s COMME N TS: 4 3 Seined nth hand nets from the Tubes down to Figh11ay IIJ . RetH-rnell to 11.ke Planted Returned to lake �' Q V ·-• •FIS':EI ·sAL vAoE s••liq Res NAME OF v, ATER -----------------------__ _________ DAT~ ·SUPERVISOR lnlen SV18'eit ....,;;.;____,___......;;........,; -------------------------Eau.re aa1vage equipment. Equipment Used 1.LesBBI'. R• !eliafeno ------------------------- Personnel Engaged Average Size (inches) Species Crappie 6-.I2 ;oo 1'000 Invento I.Bass IO-D 200 200 fl 18-26 · u l II · IO-I6 Jl Iii. 26 D Cll8Jma\ cat ;· +' w.Baaa . "~ Walle,e···· -- •'••· •••• 0 •• , ····· .. , .. IlweI . " a.,... II•I2 .• ... . .. .. Number of Fish Pounds ~- Bl1Wleacl·-- Cup ' ........... ,,.,, .. ,. , ..... ,.. , ... Shad ·--····· , •• , ·····•"' .... 22 . .... ., .. IO-II I2 ,-xa 1,000 ,-u 1000 .~.· 3 If aa • I2 n - .. Cal'p removal opeatia • Battal with Split; Jeana. Vsecl n8'tlng i,lll'Ohaaecl from Kaster. fl.al m pieces togelher Nkins up 2000 ten of COMMENTS: net. �FISH SALVAGE ---------------------------------Sterling Reservoir NAME OF WATER DATE SUPERVISOR May 25-29,I959 Rex Teliaf erro Equipment u sed_ _.,...,.Ey~k,..e...u ....ew.tw...Sol..111..-.MH~oo~k...__;a;w.n,..g._. ...,l..,in...,ew.,-...i.G.wj..J...,J,...p.. et,W,j.sil,,I,.___ _ _ _ _ _ _ _ _ __ Dick Smith. Ronnie Lessar. ----------------------------- Personnel Engaged Species Average Size (inches) Pounds Number of Fish COMMENTS: Research and inventory work on Sterling Reservoir,hel.ping Rex Teliaferro. �FISH SALVAGE August26- Sep 4 , I959 Sterling Res ---------------- DATE- ---------- 1 AME OF "\'! ATER SUPER VIS OR._ _-...1.E:rn:..:...1-1;e~s.i..±_.;i. S+ .1,;,z:"-J.1.l . e:;:..it..-e;:.iz:,;___ _ _ _ _ __ Egui pm ent Us ed._ _ _ _ _~Eh ~ t::.::i:.:.:r.:::e:..._:=. sal :::..v!.!a:::.fg~e:::,...::eg~u;;:;i.t::PID=en~.t::.•= - - - - - - - - - - - - - - - - D.Smith. Rex: Teliaferro Personnel Engag e d._ _ _ _ _ _ _ _ _ __ R. _Lessar _ _ _. _ _ __ _ _ _ _ _ _ _ _ _ __ Species Average Si ze (inches ) P ounds Number of Fi sh Crappie 6-I2 500 4uoo B. Bass IO- I2 200 200 rn _91,, ?T ".l II W. Bass I0- 16 32 26 II Walleye I8-2I I4 3 II R. Perch II-I2 22 22 II :a'll.lhcad IO-I2 I2 I2 II Carp 9- 18 29000 Shad 9-II f:h::>r>TH>l ~::it COMME NTS; . Invento ry II 1000 Carp removal operation . Baited with Split Beans . Used netting purchased from Kas t er . Tied two pieces together making up 2000 feet of net . �FISH SALVAGE Personnel Engaged - - - ---,1P..:..,,..;!a~HU:1i' !:~t-Rh ..-,----.::,...,+. R'9eb B@;ortRN:s;..•. . . . - - - - - - - - - - - -- Species Average Si ze (inc h es) -- Numb er of Fish P ounds Bullhead 5- 7 I4 I4 Cr ppie L 5 I. 5!a 8,. p.,.,....,h 1- lO 2I2 6. o6u COMMENTS: ein ed f i h f ro tlitch, h ck d th wat and no f ish . aitch from th and hol to th below th r tubes in the outl et ound v r y 1 t le ir and �FISH SALVAGE Sterling Rea rvoir NAME OF '\'!ATER DATE SUPERVISOR ----'EJ'l,e. . ,1nte"'S.+t,. . .,.,.u.,_ta..-ii-leri&,...e""l_ _ _ _ _ _ __ Personnel Engaged D. Smith. s . Bland Average Siz e (in c hes} P ounds Num b er of Fish ell . ----------------------------- Specie s R. Percb. 3-9 I~7.30 54.525 Channel cat. 5-8 64 I,920 Crappie .3- II I,562 42,022 Bullhead '5-IO 1.67 !I .OTO B. Bas -IO 27 65 Cairp - IOO - ?no ~ht:ui Suckers - Walleye Pike 8-I6 R. Trout. 9-I2 COMME NTS: - - F - Fish w re saJ. vaged from outlet tubes and outlet channel. �F ISH SALVAGE S p ecies Average Si ze (inches ) P ounds Numb er of F ish , 7. 7 • . . Jrc ·t H;lC COMME NTS : ;c.· t V ' �FISH SALVAGE T. Lyn h . E . u d a. . . fish truck . i ckup . Hand s eines . qu1pm e nt se - - - - - - -- - -- - - - - - - - - - - - - - - - - - - - Personnel Engaged D. Smith.. . Roberts . ex Taliaferro . L. ' rippl t . Average Size (i n ches) P ounds Cr appie I*IO I. I Iu 123. 976 R. Perch 2- IO 705 55. 700 al.leye Ih- .!8 IO 5 a. Trout I2- I I6 II Specie s ,,.(},,~ I b-; _..,_ ·I tJ/ .,._ r, -A • • '-1,J'I ,:, COM MEN TS: inch to orked do ditch bed. N umb er of Fish If -!1 4 I ,- s p..,_,._AJ.. 2- ,,, /J...1, ....-k ls . I r;- f- 7-1.o c;-2.6 I l'2.rci ~ 22 0 "{, I • ed tubes and ditch at terlin Reservoir • th hand seines i nch mesh, 2 t o 7$ fe et long . . s trenra roXimatel 2 mil • oat fish ere picked up at drop s i n �.. I. Titler Trash Fish Removal trom Ha.sty LakG Ilo Dates November 30., 1948 III. Supervisor: R. H. Hess, Supt. Research and Distribution VI. Investigators To Y. Lynch, Fish Technician Vo Introductiont The arsa below John J.fartin ReserYOiJ" (Caddot\ Dam) is being developad recreationally by t.he U. So Engineers. In conjunction with this program, the Colorado Gama and Fish Department has undertaken to imp1'0V8 the t'iaher;y resources of the area. The trash .fish population or Hasty Lake was removed in oroer that a n>re deeimble g&me fish popul.atlon could be ea·tabliehed thers o Mr. R. fl o Hess and 1.fr. \V. D. Klein, Fishery Research men of the Colorado Game and Fish Deparment, investigated Hasty Lake (Caddoa Sandpit) on t,vo separote occasior,so Both of these men recognized the value of this fishery resource and their recommendations can be found in "Initial Fisheries l~geioont Plan for Caddos. Dam", December S, 1946, a.nd »Report on Seme Lmnar Area Waters," August 23, 19460 VI • Summa.r;yt Pa:r-t I Hasty Lake Description and Pre-invento!"I 1. Hasty Lake 1s located in Bent County, about om mile east of John Martin Reservoir and approximtel71.50 feet north or the Arkansas River Channel. 'l'he take rm.a or:f.eina.117 used u a sand and gra-.el pit during the construction cf John Martin Reeervoir. There is no natural eurface inlet or outlot.J the water level or the LaJce 1a fairly stable o The water level is ma.intainad by seepage and ground aten. At one time there was an opsn channel between the lakB am the river., 2. Soundings and measuremants of Hasty Lake revealed the following dataa lta.x1.nnw depth a • • • • • • • • • • • • o• • • • • o• • lS feet 6 inches 8 feet 9 inches Area of "Mlter sur:face ••••••••o••••• 73 acres Awrage cleptti o • • • • • • • • • • • • o•••••• ~ • 3o 4. In general the lake has little turbidity, on calm days the bottom can be seen to a depth of seven feet or more. The maximum surface temperature is 7So F. The pH. is between 7.,4 and 800. Fhytoplancton and Zooplancton are commonJ higher aquatic plants are l'al"'eo S. The shore line consists rostly of steep banks o �- 2 6. The species of fish .f'oul'Ji in the Lake were t Cypr:f.nidae ••••••o••••••••o••• (minno'lr} famil.T Ameiuridna •••••••••••o••••••• !oat.fish) Centrarehidae o••••••••••••••• sunfish) kill.fish) Cypinodontida.e ••• Catostomidne ············••o•• (sucker) Angu1JJ1daa ••·••••·•·•··••••• (eel) " " • " o........... Salmonidae ••••••••.••••••••. • (trout) a " Part II The Chtunical Treatment and Post-Inventory lo The chemical treatment of Hasty Lake 1988 made o Surday., Nowmber 14., 1948 o The surface water temperature was 46° F. 2. 1h00 pound.a or Fishtox and l., 700 pounds of dry powdered derr:1.8 were used. Both contain rotenone, which is the effoct,ive agent. A large portion of the dry derris ms rather old and ittJ strength was questionable. The total amount of both chem.teals used TJae .3 ,100 pounds. It was added to the lake at l.8 parts per million. 3 o Two methods were used to distribute the chemicals 1 a. The dry derrie was mixed with water until it was all in suspension a.nd resembled a soup-like mixture. This mixture was carried in tubs by outboard mtor boats and poured out into the propeller wash behind the boats tor distribution. One mixing station was set up rear the center or the lake al'Xi f'our men llimd the derris o The boats returned to this sta- tion to have tuba refilled. bo ?he Fishtox was put into burlap s:1ck:B and trolled about the lake by outboard n::>tor boat.a. h. About fifteen boats were U!led in the opsration. They passed trom the east shore to the west shore and back again until they bad covered the lake fully. They oorked from the north side to t1le south side about thirty teet apart. The complete distribution took five hours o Fish reaction was eVident within four hours atter the dietribution began. Thia reaction ,ma apparently complete at the end or twenty-tour hours. 5. On Tuesday, November 16, 1948, most of t he fish carcaeaea were piled ~ t the east shon3. Not all ot the fish came to the surface after deathJ maey suckers, catrish, and minnows sta,ed on the bottom. �Estimated Kill: Large Fish Carp aoooeoo••o•• 10,900 averaging loS lb&. each or 16,))() l.bao Suckers O . . . . . . 00 Catfish Bullheads ••••• o. Channel • • ••• ., o. Blue Trout 7,500 a 2 11 11 3,500 l Sun.fish o•••••••o 250 Rainbow oeo•o•••o loch •0••••••••011 7 23 tt Basa 1 ff l 11 Eel v • • 0 •••••••••••• Total large fish 22,18; 6 lbs • each ~ lbs. •·· ••···••• 9 • • W• • • • 3 to 1 lbo S tc l lb. or 21500 II or 100 " or 12 • or S n n 6 to l lb. or 42 Q It l lb. each l lb .. each or 7 n n 2 lbs .. 4 lbs. or or or Total Pounds 2.3 2 •" 4 11 rs, ,64.s " Total small fish killed - 1,6,000 An est:lma.ted pereenta.ge of small fish is 1 Suckers ••••••••o••• MinnOW9 ·•~·•••••••· Carp••••••••••••••• Sunfish o••••••••••o Bullheads o~•••••••• 43% 3S% 15~ 2% 5% 7. A toxcidity te t was m.1de or the water of Hasty Lake on the following daya1 a .. November 17, 1948, test .fiah died within three hours .. bo November 24, 19h8, t.:?at i'ish were not affected. The teat fish used were Green Sunf1shJ they were placed at different places about the lake at varying depths. 8c One 100 foot and two 50 foot gill nets were set in the lake for 24 hours each, ten days af'te:r the chemical treatment was made. N'o fish were taken in these gill nets • 'rhis 1D a good indication that the trash fish population rem.owl at Hasty !eke was successful. VII. Recommerxlationa The water conditions at Hasty Lalce are quite suitable for trouto It is the:refor-e recol11!Mn:ied that this lake be stocked with these tish o �,.,...,. -4VIIIo Discussion and Aclmowledgementas lo Hast.y Lake ie a popular fishing Lake and planned developments promise to make this hke part of a valuable recreational area. 2. Over 600 interested people were present during the day ot the reroval operations o The l.a.:rger game fish ae well as many carp were taken horoe tor the frying pan 'by a number of people. 3 o The department wishes to express its appreciation to the following people for their cooperation on this project.a Mro J. S. Sharer, District Ch1et, U. So Engineers• vm.o 1s in charge or John Martin Dam and the eurroumine area in which Hast7 Lake is includedo ?Jr o Roy F.cklee, Colorado Qame and Fish Conmissio.mr of District 13. Warden Gail I3oJ'd, or LAs Am.ms. ur. Go E. Kimbl e, President, Holbrook Lake Sportsmen Club, and to all the sportsmen trom Olney Sprlngs, Rocky l"ord, Swink, I. Junta, Las Animas, Hasty and :t..amar. � https://cpw.cvlcollections.org/files/original/597a77405428c2dff17027d1407ce3fd.pdf 835e7e858d69197c1e41c43643bd176e PDF Text Text F :Or-.l dd SUMMARY OF PROGRESS REPORT ON RETURNS FROM MARKED FISH Ray H. Hess and William D. Klein COLORADO GAME Al'ID FISH DEPART1IDIT Denver, Colorado ABSTRACT During the years 1946, 1947 and 1948, the Colorado Game and Fish . .. Department tagged_ 18,861 legal siz!=! (over six inch) trout using metal jaw tags. Recovery of these tags was dependent on voluntary returns by fishermen. :Rainbow trout, (Salmo gairdnerii) gave better returns to the fishermen than brown trout (Salm~ trutta) 'Wh;n both species were planted under comparable con.di tions. •• Trout lakes and reservoirs should be given consideration at least equal to streams in planting programs involving legal size trout. Migration was found to be sufficient to warrant consideration when planting near posted waters or waters othendse inaccessible to the public. Necessary fall and winter plants should be made in lakes and reservoirs rather than in streams. Downstream migra- tion out of reservoirs with surface or near ·surface outlets was noted for both fingerling and adult trout. Excellent growth of legal size trout in older reservoirs indicate that factors other than natural food production may be responsible, at least in part, for declining catches. Streams planted with legal size trout should be stocked as frequently as is consistent with economical use of distribution personnel and equipment o 1iiiiOOlllffiOO BDOW027890 ; ~ 1 o n ~ w . . . . a t 1 ~ . r t . n a . . . . . 4 l W l 12if!t&el&&!IZ!SlS~iJtit222GSillf.!M\IWPmfiB,'ffl~'Y.&--9fu§WWW.L~&4!&}~~ �I -2The Colorado Game and Fish Department has carried on an extensive trout ma:rl<:ing program since 1947. This program has been conducted under faro sets of conditions; (1) planting of marked fish in experimental areas -where returns are gathered by Department personnel, and (2) planti.-rig of tagged fish in trout -waters throughout the state and depending almost entirely upon voluntary returns by fishermen. The second method obviously has many limitations., however, it is the only method th~ seems economically feasible for obtaining data on plants of legal size (over six inch) hatchery trout in a large mnnber of waters throughout the state. This report deals only with tagging where results are dependent on voluntary returns. • In 1946, 1947 and 1948 there .vere 18,861 trout tagged in Colorado in addition to those tagged in experimental areas. A metal jaw tag -was - used exclusively on legal size fish and proved to be generally satisfac- tory. Each tag carried a series letter, a mnnber and the abbreviation for Colorado. To increase the value of comparisons beti'Teen returns from diiferent waters, publicity on the tagging was made as uniform as possible. Plants Yrere accompanied by placement of posters on the waters concerned a.;nd by state-m.de radio and newspaper publicity asking fishermen to mail recovered tags to the Denver office of the Department, giving the qate and location of each tagged fish caught and the length of the fish. In an effort to .further stimulate tag returns, a postcard was developed on -which tags might be taped for return to fishermen for souvenirs o This card tells the fisherman the species of fish he caught, its length when f• !t, f f j I I It t .tftMIVl1&1 £& - OSlE&!i&i*IMWWW"'--CO!iWWW.i : w @ - M M I_ _J �I - 3 planted and the date and place of the pJa nt. Also, on the back of the fishing regulations there is a picture of a tagged fish and instructions regarding the return of tags to the Department o Of the tagged fish planted (other than in experimen·tal areas) twelve I II plants were made in trout lakes and reservoirs above 7.,ooo feet elevation., nine plants in smaller trout streams running less than 100 s·econd feet (nonna1 summer now), twenty-one plants in larger trout streams (over.loo second feet normal summer flow) and two plants in low elevation reservoirs. Most of the plants of tagged fish consisted of legal rainbow and brown trout, since these two species make up the majority of trout raised in Colorado hatcheries. Ymen comparative information on brown and rainbow trout is desired, equal munbers of brown and rainbow trout of approximately the same size are planted in the same waters at the same time, usually at the rate of five hundred o:f each species. The tagged hatchery trout planted averaged about- nine imhes in length. Compilation of volnntary tag returns at the end of the 1948 fishing season supplied considerable interesting infonnation, much of which is valuable .from a management standpoint. Both rainbow and brown trout exhibited a considerable tendency to move downstream from planted lakes and reservoirs having a surface or near-s11.rface outlet o On one plant in such a reservoir, 36 percent of the rainbows reported arrl 22 percent of the bro1m trout reported 1rere caught in the stream. below the impoundrnent o From another plant 39 per- cent of the reporued rainbow trout were caught below· the reservoir in J26,_J&IJ fill§! 11)! Mif.1EhC2&W.QJ&LJJU1iiU&&iJtL2 :tf!ild!.L:ffl.4!hSD~§i'.!i,~™Mif...iM4l,M.$~5&1.1.~-1.#.'i!P.. m¼ti~M:~.-~.~~ .. na.,..~.~=~~ �-4'Which they were planted. Considerable migration by stocked legal size trout was evidenced especially in the larger streams • Of the tags returned from a plant of brook trout (Salvelim fontinalis)in the Ifichigan River in North Park, 35 percent 'W8re caught in the North Platte river- in Wyoming. These fish had moved an _average of 42 and a maximum or 84 airline miles from the place of plant. From a plant of rainbows in the Taylor river at Almont, 19 percent of the reported catch was made downstream. out of the six-mi.le planting section. The average movement of these fish was 4.07 miles and the maximum was 36 miles. From a plant of' brown trout in the Taylor river at Almont, 31 percent or the reported catch had moved either above or below the four-mile planting section. Seventeen percent had moved upstream an average of - 2 .9 miles and a maximum of six miles; 14 percent had moved.downstream an average of fourteen miles and a maximum of fiftynine miles. A total of' 40 percent of the returns from a plant of rainbows in a one-mile section of the South Platte river near Deckers were from above or below the planting section. Twenty percent were from above the section and 20 percent from below. Trout lakes and reservoirs should be given consideration at least equal to streams in planting prograi:lS involving legal size ch'1.d near legal size trout,. �.- -5Rainbow trout planted in trout lakes and reservoirs gave number returns slightly larger than returns from streams o Tihile this dif- ference (21.9 percent against 20o0 percent) is w.i.thin the estimated margin of possible error and is not significant, weight returns were 3 .2 times the returns from streams (70 .4 percent in lakes and reseriroirs and 22.1 percent froI!l streams). This figure is far beyond the estimated possible margin of error and indicat~s that full cori..sideration of trout lakes and reservoirs in stocking programs will benefit the fishermen. In addition, lakes and reservoirs offer more economical stocking and the fish are caught over a longer period of time, allowing more equal distribution among fishermen. Brown trout gave fewer numbers returns from lakes and reservoirs than from streams (14.6 percent against 20.1 percent), but a higher weight return (h4.6 percent against 23.2 percent). Preference should be given rainbows in the rearlri.g of trout for planting on a "put-and-taken basis. In every water in 'Which rainbow and brovm trout "Were planted under similar conditions, rainbows gave a better return in both numbers and poundage. This was especially true in lakes and reservoirs where rnJ.11bers returns favored rainbows by 24.4 percent to 14.4 percent and -weight returns favored rainbows 88 S percent to 42 .6 percent. While there may be some f e-1r waters in 1mich broi,m trout may offer the better returns., it is felt that rairi..bows 1·,1.11 put more fish and more poundage in the creel in the great :aajor:i. ty of our waters. It is also true that rainbo-;7 trout :may be produced more economically at our rearing u:n.its. �-6Necessary fall and winter plants should be made in lakes and reservoirs rather than in streams. Excellent second year returns from plants in lakes and reservoirs, plus some t..l-i.ird. year returns, further attest to the advisability of this already generally accepted practice. Very few second year returns have been recorded from streams. Yfaters leaving reservoirs from surface or near-surface outlets must be screened to prevent loss of fish, if these waters enter directly into irrigation systems, povrer plants, etc. where fish would be lost or killed. Downstream migration out of reservoirs with surface and nearsurface ou:t,lets was noted for both fingerling and adult trout. In two reservoir plants the returns from below the reservoir were 36 percent and 39 percent of the total reported returns. Both these plants in- volved legal size rainbow trout. Excellent growth of legal size trout in older reservoirs indicates that .factors other than natural food production may be responsible, at least in part, for declining catches. One older reservoir nth a history of declining catches gave the greatest growth recorded in this study to both rainbow and brown trout over a tvvo year period. P.ainbows caught during the 1948 season (planted in April of 1947) averaged 7.00 inches longer than when planted. Brown trout caught during the 1948 season from the same plant averaged 5.3 inches long er th~'>'J. ~.Jhen planted. "~='Jiili~ii~!ffl:"Mfi\t:JdMi&MiLt.if!PJ a,,_ . ltl'D.&!.1K!ll>MMii'milil49h¼k ii ~~1·:,,~ Ii. I . t n b i r ~ ~ ~ ~ ~ • W o ! H . t b4i ::c.t¥.±!.mb-!WJt....X4L""""'..CWU.mtt A#A,'!41tB~ �- 7 Plants of finger lings in barren or near-barren lakes and reservoirs offer excellent returns for the initial stocking investment~ Excellent growth (as much as an inch per month during the wanner months) plus fair to good survival makes this practice advisable in barren lakes and reservoirs. Better fishing Tiill be afforded at the end of two years from heavy· plants of fingerlings than could be obtained from the moderate number of legal size fish available. Plants of legal size trout in streams should be made not closer than one-half miles from posted or inaccessible waters; this distance should be increased to one mile wherever the stocking section .is of considerable length. Losses from stream planting sections are often heavy; tag returns indicate the following percentages of plants had migrated out of the section planted (plants were made evenly throughout each section): One-mile section~ 40 percent (legal size rainbow trout); three-mile section, 35 percent (legal size brook trout).; four-mile section, 31 percent (legal size brown trout); s:uc-mile section,-19 percent (£egal size rainbow trout). These fish -were not lost to the general fishing public in the instances cited above, as open rra.ter bounded the sectior$ stocked; however, had these plants been.made in stream sections bounded both above and belo1.v by posted or inaccessible waters, the :percentages listed would have been lost to the general fishing publico Areas close to posted ,raters would not be barren as a result of no direct stocking; movement by fish stocked either abova or below I f t t f : W \ l ; ; , , ; ~ 4 . £ ~ �- 8 - . these areas wot4d populate them indirectly. Streams planted with legal size trout should be stocked as fre~ quently as is consistent m.th economical use of distribt..,tion personnel and equipment, the number of fish involved in each::.plant to be apportioned accordingly. Lakes· ~d reservoirs (of over 100_ surface'."acres) . --. ·- may be stocked to conform with seasonal a~lability of fish allotted to each lake or reservoir, even though this might involve only one to two large plants each year •. Returns from plants of tagged fish indicate that these fish are removed at a rate -which varies directly -with the fishing pressure and - -~.f!/~.. :. • .. • inversly with the size of the water concerned • The bulk of such plants (90 percent of those reaching the creel) is removed from the average smaller stream in from one to three vreeks; _ .from the average larger streams in from three to s even ·weeks; from the average -lake or reservoir - not before well into the second season. It is .felt that mo re data is needed of' the type that can be obtairied from voluntary tag returns., and this ;rork is being continued in Colorado. l '¥ !S f W WWW1....&i2lJi!b5W-:w.+:i#a!.@Mj•fflPilW'M a::5JNIH. t+mmm :«a:.wwwmNt&:mPLm _twa:wta.u; n ~ 1 r a z s . zsa1am ::o: �n. Title: ~4ustrlal Pollution Af£ecting the Gam.s Fish Resource in the State ot Colorado. Date• January 5, 19b9 III. Supervisol't R. n. Hess, Supt;. Fish Reaearoh and Distribution IV. - ·Investiptors W.R. Seamart Introductiont V• • A graphic descript,ioD. of 1adustrial pollution affecting the pme fish resource in .Colorado \'JU :requested by Mr. L•.. A. Youns, Sanitation Engineer to~ the Colorado State Doa.wl ot Health. Tb1o information is to become part ot the State•s pollution survq 'Which utll be sent to the federal service under the NCGntly enacted federal anti-J)Ollution bill. The enclosed map is based upon a color keJ'· as followsc Red Stream - S\remu polluted to· an extent to &e detr.lmental to game fish life. • Orange Stream - Stream flightly polluted. This also incmclee streams !'nlm ~ eroded watersheds. Green St.ream - No polluti~n... t-JVut streams. VI. Survey, Pollution sources are represented b7 Nd numbered. do-ts or 81:Al's• .The single red dew are mill tailing sources and are 1 recorded as tollowe 1 . ----··· ...... , ..,: -, �location Jameiitoffl Above Nederland 2. Boulder Creek Above Silver Plume 3• Cl.ear Creek b. Olear Creek Below Oeorget,own Dumont S·. Clear Creek i • Clear Creek Idaho Sprlnge 7• Clear Creek via No .Clear Ck• 8. elev Creek via Ob1eago Ok• 9. 10. 11. 12~ lJ•• 14 l$. 16. 17. 18. 19. 10. -~ 1. Clear Cnek via Chleago Ck• ciear·cmek v1a Fall River Clear Creek via Fall lliver Snake River Snake River Blue River Blue River via .Swan River Blue River via Ten-Mile Creek Middle Fork South Platte lliwr via Mosquito er. W.ddle Fork So. Platte River Middle Fol'k So. Platte River Arkansas River via Calitomia Gulch Afkansaa !liver via Lake Creek 22. bka.naas River via 23. 24. 2S. 26. 27. 28. Conk and Box Creeks Al1mnsas River via Brown•s ~ Roaring Fork River via CUtle Creek Slate Cl'8ek Tomicbi Creek via Oold Creek 'lomicbi Creek Fountain Oreek 29 •. Oil Creek ,o. West Beaver Creek 31. Henson C,eek .32. Uncompahgre River 33. San Miguel River · Cent.ral City . Above Idaho Spri.np Above Idaho Sprinp Alice Below Alice 38 • Las Animas Rivar •39 • Lu Animas Ri"18!' •io. tu Animas Btver via Cunningham· Gu1oh. ',a. Rio Grande River aiii Dhi!iii &. Watson m.ll. , Mattie w.n .. Front Range Min .. Co. A. s. & R. Mill BelO\iUontesvma Lombard Mill Florida 1an1nc ao. Teller Basin 'Mining Co, CJ.imag Old. tailings Ol.irmx MolJbdenum. Ooe Above Montemuma Breekenridp Abow Breckenridge Old tailinga Above Alma Old tailings Below Alma Fairplay Dredge - Timberlim Co. Leadville Below Leadville Dredge - Nacoma Oo. Oal.1t • 01llch Mining & Milling Co. Urd.ted Gold mntng Co• Irrigation tunnel fJ."Olll Lincoln Creek - carries old t,ai 11ngs. Placer Discoloration Above Salida Colorado nuoepar Oo. Uidnight Mining and Smelting Co. Above Crested Butte Old Tailings Ohio City Raymond Gold M:tmne eo. ihitepines Colorado Springs Cripple Creek Viator Lake City 011ra7 )h. San Miguel Riwr 'Via Howud 1s Fork JS. San Higa.el B.ivervia Hot81d •a J'ork and Turkey Creek 36. ~ Miguel River 37. San Miguel River ~ Wolftongue Mirdag eo. Smuggler Uill Commonwealth Wll-Lupton Min.Co. Specht mu • Old taW.np Ruth Uil1 - Old ta1l.1rtgs Ohain-o-Mines - Old ta!l:!ogs Telluride Callahan Lead & Zinc tlining Co. Old Tail inp • Old Tailings Old Tailings Old TailiJ38S American ·tea.d & Zino·Co • Tellunde Mim.Ylg & Mill t n: Co• • Ophir Silver Bell Mine Below Ophir Alta!U.nas Naturita Uravan u. S~ Vanadium Corp. Vanadium Corp .. of America Shenandoah-Diws m.n. & Mill. eo. Pride of the West flill - Old f alllnge Highland Haey Mill Silver\on Silverton Above Howardoville Creede Bmperius Mining Co• • Old Tailings C., F~ and I.,. Mine., • at. Bio Grande liver via Goose Ck. Wagon 'flheel Oap J.3. Alamosa RiWJ' Jasper ,h4. Uncompabgre a. via canon Ok. Above Oµrq Summit.ville Mln:tng Co. Camp Bird Und.ted and King ~ase 116. Eagle liver Old Ta1Unga hS • Uncompabgre 'I• via Red utn.J)k. Above Oura7 , ~ Minturn Idorado Mining Co~ �Follow1ng are industrial pollution sources other than mill tailings which affect, game fish wters. These are represented b7 red stus • _on the accmnpln11n1 map. Location arm Affected t. ~ifi '1atte River 6v:id a. South ·Platte Riv.r No . Poudre River A. Pouche Riwr 9. Bis Thompson River 10. Big Thompson River u ff fl If, a " ti ff It It rt. Morgan "ff ff- ff u ff tt II D n n Q fl a Windsor tt "ff " n Ft. Collins u a a ff ff tt ti et ft. ff 0!4eeley Johnstovm fl ff " ff n ft ti ff It n ff ff ff. n ti fl II fl n Longmont " Q It ft "· II ff n If n It. " H " ft Q n ft o. II Loveland n.· St. Vraia Creek 12. South Platte River South Platte River South Platte River ]$. South Platte River 16. South Platte River 11. .bkansae River via Salt Creek Ft. Lupton Brighton • Denver ½f: Denwr Pueblo • Meredith Lake 'l,. Arkansas River 20. Arkansas River 21. Arkansas River 22. Yampa Riwr Sugar Cit,7 Rocky Ford Swink Holly Steamboat Springs White River • ff stream a.treated Eaton 6 •. Poudre River 0r1nrshid cfreat ies~rn iuiar &. u Sterling Brush Platte River South Platte River i!:s. South ma.1.n i!! of Pollution u@ir Beet 1iiitii ti II Denver Sewage Oil and various chemical wastes Steel mill waste liquors Sugar Beet. Was- ff More oomplete oeverage by anothor depa-rtment. Colorado Fuel amt Iron Co. Holly Sugar Co. n n· 11 n n A, fl " 11 ti ff fl fl ff· ·u " Q . Coal slack, refuse, Hayden etc. Range~ Q fl Varied 21,.. Colorado River Grand. Junction OU waste and caustic Various oil companies soda Varied Cannery wastes Clear Creek Idaho Springs Dump - re:f'use, etc. 23. 2$. VII. Cit7 of Idaho Spr1ngs SlJJ111'i1&1"11 The ?lreviOUO lists of pollution sources are in rough outline tom. More dat.ailed 1nfo:rmat1on regarding the status or individual· areas as to ownership., type or operation, and degree ot pollution can be obtained 'bJ' contacting the Fish Research Diviaion of the Colorado State Game and Fish De:,artment.. At present.., anti-pollution work is being undergone on a state- wide scale. Maft7 ot 'the listed industries ·are not actively polluting and are included only as potent.ial sources of pollution. W. R, Seaman Fish Teobnioian III �C02~8 I., Titie 1 ., 1-ea:,c of' 'l rou.t Streams &nc' N!l.!Wer of Trou·t; Lakes- Sta~3 of Golorr.1.clo~ IIIc. Supervlsorr Ro H.. Hess., Supt,, Fish fl.2isearch and Distribution IV o Investigators \'l .. Ro Seaman V•: Introductions • Inasmuch ae a. figure on th9 t,-out stream mileaGe of the state is a matter of' conjecture, the folJ.owing figures 118re obtained aa an 11pproximato total o i.lileagee were scaled off of national forest quadrliU'lgle maP6, and the lake nwnbe,:-a uere taken trom individual county maps. The follo1'i:l?, f'ieureo should be conservative, as meat¥ier is di.ff'icult to dete:ird.::ic trom ms.ps, er.id the m::>re remote stream. and lakes are often net shown on exl..eting mapso VI.. Summary: lo A total of lh,~t:4 miles of trout strecma for the state was obtained. 2o 2 ,LOl trout lakt-s were tot:i.led from county maps. VII" Imrest:tention: A. St~cl1il l.!l.iloagec ~JY main drainazes follo't'rl lo South Platte 3. Arkansas 4o 5. North Platte GolorP..do 6. Yrunpe. 7o 89 J.liles Larsi1,1e 2o Ylhite 8. Dolores 9., San Juan 10. Rio Grande Tot.al - - - 1,623 Uilea 9.31 Miles 656 Yile:a - 6,655 J.~iles - 1,236 Miles 357 Miles L13 llilee - 1,012 Ki.lea - 1,.38,l ili.les 14.,5'54 Miles •B. Trout lakes by counties follcms s Alamosa Arehulet,a Boulder Chaffee Clec.r Crc0k and G·apin - Conejoa Costilla Custer G 33 93 33 100 101 8 21 �- 2 - VIIo Investigations {Continued) Delta Dolores Douglas 1$1 Eagle 118 Fremont Garfield Grand Gunnison Hinsdale Huar.fano 28 l - Jackson Jefferson Lake Larimer w Animas - 4 347 84 102 $1 12 lll 6 19 177 La Pb.ta 4 50 Uimral 30 Mesa Uo£fat !.Tontezuma r.:ontrose Ourn.;y Park Pitkin Rio Blanco Rio Oraride Routt 99 3 34 1.3 10 29 99 103 11 72 Snguache Ssn Juan 38 San Miguel Summit Teller Total 11 87 43 9 2.Lo1 �I. Titlet A Possil>le Plan tor Meridith Jake 1:lshe17 Improvement n. Dates February- 3, 1949 III. Supem.sort R. H. Hess, Supt. leseaJ'Ch and Distribution If. Investigator:• T. •• LJnOh, Fish 'lechld.cian IV. V. Int:roducticau • Meridith Lake contaills an ~pulation of fonge ti.sh such • oarp.1 mi:mums, mid. sunfish. !be Lake also contains DL1maro\18 bullheads. The car,, m1mlowa, and bull.beads are omutvorous feeders, however thtq are not :lncl1ne4 to be predators. The aunfiah are inseat feeders- ~ 'there 1a a definite need for predator species at Meridith Lekev !he stocking or tr, sine predators woulol probably fall since the JQUD1 ot this species and forage fish compete for the same tood. To at.tempt to use the exieting cont1'0l methods tor fishery im-prowments at Meridith Lake veuld be impossible, due 1n this case to the large area of the lake. VI. S~ Jur.lng Oetober and llovember of 191'8, Jaek M. Simson, District llistrihution Supervisor, eucoeastulJ.7. oarr1ed. out. $Bl-vase operations at Horth lterllllg and Jumbo leservoin • Su,~ fish ~ tm, and ten inches were salvaged. TOl were crappie, S% •re bass and the other 2~ •re ring perch and bullheads. These fish '18N trausport.e4 and stocked in other waters throughout the State. The majorit.7 or the fish '\181'$ OJ'appie, two to tour inches in ~ , thaoe fish me not only ot suttioient eiae to. eampew with torase fish tor food but they will 'Ile abl.e t.o remme the nmnbers ot the to~ :fish. Orappie and bass are oan.i:votous feed.era and fish consists o.t a good _part ot their die\•. , With the l\lUfribar ot forage fish present in Meridith Lake; crappie sad baas should cert.ai:r47 suwiw and thriw:. • VII. Recommendations It, is recommended that crappie am bass taken from salvage operations at. North Ster]4ng Reserw>ir (if .&117) during 191&9 be stocked at Meridith Lake. The Ring Perch and bullheads should be exclude,~ The bass and crappie should be stocked at approximately 2S per acre'° VIII. Discussioiu It is twa that crappie are inclined to oi,ei,-pop-4ate water areas · ~ 1n which they are stoeked. However, it these fish are stoclced. at �itbou\ 25 per acre in a lak-e ~ 4,000. ao~, it 1d.ll nqldre a letlg· time .tor such aver-populatiollq ~ e the fishermea of the ana w.tll haw a chm1c& to eatch. som.ething- besides carp and six 1nah bullltands. • . •. Tlds tne ot fisbar,-· ~rovemezm will be· efteniw onl.7. ror limited •per.loda ot time• • .... �2Z I. Title : Pro13rcss Ropo rt , Returns from Plants of Marked Fish, 1946, 1947, 1948. February 14, 1949 II. Date: III. Superintendent: DJ. Introduction: Ray H. Hess, Supt. Fisheries Research & Distribution • . During the three-year period indicated above, a total of 20,861 marked trout were planted in Colorado lakes ar.d streams. These are exclusive of those used on the Nor th Fork of the South Platte project and the Antero reservoir project, on v1hich separate reports will be made. i :arking nas accomplished by either cli pping a combination of fins or by attaching an individually numbered tag to the lower jaw of the fish. Plants were accompanied by placement of posters on the waters concerned and by state-wide radio and newspaper publicity asking fishermen to mail recovered tags to the Denver office of the Department, giving the date and location of each catch and the length of the fish caught. This publicity was made as nearly equal as possible for each plant. In an effort to further stimulate tag returns, a postcard was developed on which tags might be taped for return to fishermen for souvenirs. Thi s card tells the fisherman the species of fish he caught, its length when planted and the date and place of the plant. No prizes or rewards were offered. Sportsman cooperation has been excellent. Yihile it is evident that tags mailed in will not represent the total c~tch, returns from plants of two or mo~e species of similar size planted in the same water at the same time should be directly comparable . Due to similar publicity, returns from different waters should be comparable within a limited margin of error. Grovrth and migration data should be valid, their value depending on the number of returns received. Plants of this nature are to be continued, as it is felt that present data is insufficient to enable us to arrive at definite conclusions regarding all water types, and species of fish planted. Tables below indicate the numbers of marked fish planted during each of the years concerned, by species, and the numbers of plants involved by nater type. �- 2TABLE I Marked Fish Planted u--- - 1947 1948 Hatchery Rainbows, over 611 length:_.:,. __ 100 11,363 3,6n Hatchery Lochs,. over 611 length ------11 ·495 Hatchery Brooks, over 6 length---2,000 Hatchery Lochs, Under 611 length----• 61 Resident and miscellaneous trout----1oo • '17,530 Total-~----------------~~Total, all years----------- 20,861 ·2,127 1946 770 ·334 ·3,231 TABLE II· Number of Plan-Es, by 1"fater Type Trout Lakes and Reservoirs (Above 7,000 feet elevation)-------------------- 12 Smaller Trout Streams (Less than 100 second feet normal sunnner fiow) ----~------------------------ 9 Larger Trout Streams (More than 100 second feet normal summer flow)------------------------ 21 Low Elevation Reservoirs (Below 7,000 feet elevation) --------~-------- - 2 Total--~-------------------------- 45 V. Comparative Returns by Numbers and Ueight. Table III below indicates returns by species, water type and year for all plants. In each case 100% equals the number of tagged fish planted or the ~~ight of fish planted. TABIE III Numbers and TI'eight Hetu rns, All Plants %of Tags Returr..ed 1st Year Rainbo,1s Lochs 2nd. 1st 2nd Year Total Year Year Total Trout Lakes and Reservoirs Smaller Streams--------------Larger Streams---------------Low Elevation Reservoir------- 12.2 17.0 19.4 6.8 9.7 21.9 3.9 10.7 14.6 2.8 19.8 24.1 1.6 2,.7 .8 20.2 12-, 2.0 14-5 %of Return by Weight ___,.., _ Trout Lakes and Reservoirs Smaller Streams--------------Larger Streams---------------Low Elevation Reservoirs---- 22.8 18.3 21.8 1,.9 47.6 70.4 5.9 38~7 44.6 3.0 21.3 25.8 1.9 27.7 1.1 22.9 15.5 3.2 18.7 ~ �• .T .i - 3- Table IV below indicates returqs by species, water type and year for only those plants involving stocking of bo'lth rainbows and lochs of similar size in the same water at the same time. TABLE IV Numbers and 1.-eicht Returns, Duplicate Plants of Rainbovrs and Lochs RAINB0-~75 1st Year 2nd Year T·rout Lakes and Reservoir -- 10.0S~.aller Streams----------- 28.7 Larger Streams------------ 22.2 14.4 %of.Tags Returned · LOCHS 1st 2nd Total • Year ~ Year Total 3.7 10.7 .o 24.l 17.1 .2 1.6 .J %of Returns by ·,ieight 67.5 Trout Lakes and Reservoi~s-- 21.0 Smaller Streams ---------·--- 32 o.3 Larger Streams------------- 25.7 VI. .o ~3 88.5 32.3 26.0 6.8 35.a 25.8 1.9 2j.4 .a Comparative growth as ir.dicated from returned information. Table V below indicates average growth by species, water type and year for all plants. TABLE V Average Gro,vth, All Plants RAINBCmS Gro17t,h in inches (Averace) 1st 2nd ·Year Year Trout Lakes and Reservoirs -- 2.1 Small Streams----~--------- .2 Larger Streams-------------.4 Lou elevation reservoirs---- 2.6 2.6 .5 1.4 LOCHS 1st 2nd Total Year Year Total 4~7 1.0 1.8 .5 .7 .2 2.5 .3 1.3 ., 4.3 1.8 ,Table VI below indicates average gro,7th by species, water type and year for only those plants involving stocking of both rainbot/S and lochs of similar size in•the·same water at the same time. TABLE VI Average Grovrth, Duplicate Plants of Rainbows and·Lochs RAINBmJS Growth in inches (Average) Trout and ___________ Reservoirs _.:. SmallerLakes Streams Larger Streams------------- 1st 2nd Year Year LOCHS 1st 2nd Total Year Year Total 5.a 1.6 .2 .a �-4VII. Evidence of Migration as indicated ·rrom Returned Information. 1. Both rainbov1S and Lochs exhibited a considerable tendency to move downstream from planted lakes and reservoirs having a sur. ~~ce or near-su~face outlet. On one plant in such ~ reservoir, J6% of the rainbows reported and 22% of the lochs rep~rted were caught in the stream.below the impoundment. 39% of reported rainbows from another plant were caught below the planted reservoir. 2. Considerable migration by stocked legal size trout was evidenced, especially in the larger streams. 35% of .the.tags re- turned from a plant of brooks in the .ltichigan river in North Park ,rere cauc}:lt in the North Platte· river in ~'!yoming. These fish had moved an average of 42 and a maximum of 84 airline miles from the place of plant. From a plant of rainbovts in the Taylor river at Almont, 19% of the reported catch vras made downstream out of the six-mile planti~g ~ection. The average movement of these fish was 4.07 miles and the maximum 36 miles. • From a plant of lochs in the Taylor. river at Almont, 31% . . ... . of the reported catch ha~ moved either above.or below the fourmile planting section. :17% had moved upstream an average of 2.9 miles and a maximum of six miles; 14% had moved do,mstream an average of 14 miles and a maximum of 59 miles. A total of 40% of the returns from a plant of rainbo,·1s in .. •a ·one-mile section of the South Platte river near Deckers 1·rere from above or belm1 the plantina section. the ~ection.and 20%.from bel~~. 20% were from above '--,; �VIIl. Summary of Beneficial Management Praqtices and other Pertinent Information Indicated by Tagging Operation Returns1 l. Trout lakes and r~servo~rs should· be given consideration at least equal to streams in pla~ting programs involving legal size and near legal size trout. Rainbows planted in trout lakes and reservoirs gave numbers returns slightly larger than returns from streams • 1"Jhile this . . . difference (21.9% against 20.0%) is ,1ithin the estimated margin of possible error and is not significant, vreight . . . returns were J.2 times the returns from streams (70.4% in la~es and reservoirs and 22,1% tr~m streams). This figure is far beyond the estimated J?O~_siqle margin of error and indicates_ that full consideration of trout lakes ~d reservoirs in stocking programs will benefit our sportsmen. In addi tio_n, lak~s and reservoirs offer more _economical stocking and the fish are caught over a longer period . . of time, allowing more equal distribution among fishermen. Lochs gave fewer numbers returns from iakes and reservoirs (14.6% against 20.1%) but a higher weight return (44.6% against 2, Preference should be given rainbov1S in the rearing of trout for planting on a "put-and-take" b_asis. In every water in vlhich rainbm1s and lochs vrere planted under similar conditions (fish of similar size planted in the ~ame ,1ater at the same time), rainbows gave a better return in both numbers and poundage. This was especially true in lakes �-6and reservoirs where numbers retu~ns favored rainbows by. 24.4% to 14.!~% and weight returns favored rainbows 88.5% to· '42 .6%. Y.'hile the:re may be some few waters in which lochs may offer the better returns, it is felt that rainbows vdll put more fish and more poundage in the creel in the gr~at majority of our waters. It is also true that rainbows may be produced . . more economically at our rearing units. 3. Necessary fall and winter plants shoula be made in lakes and reservoirs rather than in streams. Excellent second year returns from plants in lakes and reservoirs, plus some third year returns,'further attest to the advisability of this already generally accepted practice. Very few second year returns have been recorded from streams. 4. Waters leaving reservoirs from surface or near-surface outlets ~ must be screened to prevent loss of fish, if these waters enter directly into irrigation systems, power plants, etc. where fish vrould be lost or killed. Do,mstream migration out of reservoirs m..th surface and near-surface outlets was noted for both fingerling and adult trout. In· too reservoir plants the returns from belo,v the res- ervoir were 36; and 39% of the total reported returns. Both these plants involved legal size rainbows. 5. Excellent growth of legal size trout in older reservoirs indicate that· factors other than natural food production may be responsible, at least in part, for declining catches. One older reservoir with a history of declining catches gave the greatest growth recorded in this study to both rainbows ~ �;- T - 7 - and lochs over a two :year period. Rainbows caught during the 1948 season (planted in April of 19u7) averaged 7.00 inches longer than ,-,'hen planted. Lochs caught during the 1948 season from the same plant averaged 5. .3 inches longer than ,·men planted. 6. Plants of fingerlings in barren or near-barren lakes and reservoi1s offer excellent returns for the initial stocking investment. Excellent growth (as much as an inch per month during the warmer months) plus fair to good survival makes this practice advisable in barren lakes and reservoirs. Better fishing vtill be afforded at the end of two years from heavy plants of finger lings than could be obtained from the moderate number of legal size fish available. 7. Plants of legal size trout in streams should be made not closer than 1/2 miles from pasted • or inaccessible waters; this distance should be increased to one mile ,rherever the stocking section is of considerable leneth. Losses from stream planting sections are often heavy; tag returns indicate the following percentages of plants had migrated out of the section planted (plants were made evenly throughout each section): 1-mile section, 40% (legal size rainbows); 3-mile section, 35% (legal size brooks); 4-mile section, 31% (legal size lochs); 6-mile section, 19% (legal size rainbo,vs). These fish were not lost to the general fishing public in the instances cited above, as open water bounded the sections stocked; however, had these plants been made in stream sections �- 8bounded both above and below by posted or inaccessible waters, the percentages listed would have been lost to the general fishing public. Areas close to posted waters Tiould not be barren as a result of no direct stocking·;movement by fish stocked either above or below these areas would populate them indirectly. 8. Streams planted with legal size trout should be stocked as frequently as is consistent with economical use of distribution •. personnel and equipment, the nwnber of fish involved in each plant to be apportioned accordingly; lakes and reservoirs (of over 100 surface acres) may be stocked to conform with seasonal availability of fish allotted to each lake or reservoir, even though this micht involve only one to tuo large plants each year. Returns from plants of tagged fish indicate that these fish are removed at a rate which varies directly as the fishing pressure and inversely as the size of the l7ater concerned. The bulk of such plants (90% of those reaching the creel) is ~emoved from the average smaller stream in from one to three weeks; from the average larger stream in from three to seven weeks; from the average lake or reservoir not before well into the second season. ,...------- �- 9 - IX. Returns by Individual Waters. 1. Trout Lalces and Reservoirs: Eggleston lake, Big - - - - - - - - - - - - Hell's Canyon Lakes - - - - - - - - - - - - Seaman Reservoir - - - - - - - - - - - - - Shadow Mountain Reservoir (3) - - - - - - - Taylor Reservoir - - - - - - - - - - - - - Vallecito Reservoir - - - - - - - - - - - - ~ard Lake - - - - - - - - - - - - - - - - - Page 10 11 12 13-14-1,-16-17 18 19 20 2. Smaller Streams: Bear Creek - - - ~ - - - - - - - - - - - - Chief and Republican Creeks - - - - - - - - Grizzly river - - - - - - - - - - - - - - - 11.chigan river, Eiddle Fork - - - - - - - - Poudre river, North Fork - - - - - - - - - Rifle Creek -- - - - - - - - - - - - - - - l[illow· Creek - - - - - - - - - - - - - - .- - 21 22 23 24 25 26 27 3. Larger Streams: Colorado river - - - - - - - - - - - - Conejos river - - - - - - - - - - - - - - - Gunnison river (3) - - - - - - - - - - - - Eichigan river - - - - - - - - - - - - - - Platte river, North (2) - - - - - - - - - Platte river, S(?uth - - - - - - - - - - - - Poudre river (2) - - - - - - - - - - - - - Rio Grande river - - - - - - - - - - - - - Taylor river (2) - - - - - - - - - - - - - Thompson river, Big (4) - - - - - - - - - - White river - - - - - - - - - - - - - - - - Yampa river - - - - - - - - - - - - - - - - - 4. 28 29 30-31-32 33 34-35 36 37-38 39 40-1.al 42-43-L4-45 46 47 Low Elevat:i,.on Reservoirs t. North Sterling reservoir - - - - - - - - - Tvro Buttes reservoir 48 49 Figures in parentheses in the following returns by individual waters indicate the actual number of fish involved in each instance, so that the value of the sample may be det,ermined. Returns byueight are based on the total ounces of each plant in relation to the total ounces of the reported catch. Since catch information ordinarily included the length of the fish rather than its ,reight, conversion to poundage was made by the use or length-,veight tables • �- 10 - l. Place of Plant& Big Eggleston lake, Grand Mesa 2. Date or Plant: June 17, 1947 · 3. Type of Marking: · Hetal Javr tags 4. Fish Planted a 500 Rainbows 5, Tags returned: ( 92) ------ 18.4% ( 24) 4.8% -----Total - - - - .. 23.2% (116) 1947 1948 6. Return by Weight: Ounces planted - - - - - - - - - 1,700 Ounces, Reported Catch: 19L7 - - - - - - 1940 - - - - - - - Total - - - - - - 451 269 720 ~ of Return by ~-:eight: \.._..I 1947 - - - - - - - 26.5% 19L8 - - - - - - - 15.8% Total - - - - - - 42.3% 7. Evidence or Growth, Averaee length when planted - - - - - - - - 8.0" 9.111 (83) Average length, 1947 catch - - - - - - - - - Average length, 1948 catch - - - - - - - - - - 11.611 (24) Average growth, 1941 season __ - - - - - - - 1.1° 2.511 Average growth, 1948 season - - - - - - - - Total Average Growth - - - - - - - - - - 3.6" 8. Evidence or Migration: 1947 - - - - - - - 1948. - - - - - - - - None None �- 11 1. Place of· Plant t Hell's Canyon lakes, above Uonarch Lake 2. Date of Plant: Scpt(T.lber 23, 19!i 7 3. Type of I.!arldng: Uetal jarr tags 4. Fish Planted: (All resident fish) 4 Rainbows 1 Native 4 Native-rainbow crosses 5. Tags returned: 1947 - - 1948 - - Total - - Rainbows Natives Crosses 0 0 0 0 0 0 0 ~ 1)' l) 6. Retum by Weight: Insufficient data 7. Evidence of growth: The single native·-rainbow cross reported caught was the same length as when planted, 9". 8. Evidence of migration: 19h7 - - - none 1948 - - - Mone �- 12 1. Place of Plant: Seaman Reservoir, near Fort Collins 2. Date of Plant: July 2, 1947 3. Type of Uarkings Both ventral fins clipped 4. Fish Plantedr 5. Tags returned: 2000 lochs (part of a plant or 67,000) No voluntary returns were had, due to type of marking. 6. Return by Vleight: No data 7. Evidence of growth t Use of an electrical shocker in the stream just belovr the reservoir recovered seven marked specimens on December 4, 1947, and twolve marked specimens on April 7, 1948. Averaee leneth men planted - - - - - - - - - Avcrace length, December, 1947 - - - - - - - - Averace length; April, 1948 - - - - - - - - - Average grO'\Tthj four months - - - - - - - - - Average gronth, nine months - - - - - - - - - 8. J.0" 7.0" (7) 7.3 11 4.on 4.J Evidence of migration: A number of these fish, as indicated above, were recovered in the stream belovr the reservoir. Huch of the water leaving this reservoir passes over a surface spillvra.y. �- 13 1. Place of Plant: Shadow llountain Reservoir., near Grand Lake 2. Date of Plant: June 25, 1946 3. Type of Marking: :Metal jaw tags 4. Fish Planted: ·5. Tags returned, 100 Rainbows 1946 - - - - - - - - 1947 - - - - - - - - - - - 1948 - - - - - - - - - - Total - - - - - - - - 6. Return by •~·:eight: Ounces planted - - - - - - - - - - - - ~ - 410 Ounces, reported catch: 1946 1947 1948 - -· ·- - - - - ~ - - - - - - - - - 101 - - - - - - - - - - - - - - - - - 321 ----------------- ~ Total - - - - - - - - - - - - - -7i.oo %of return by Yleight: 1946 1947 1948 - - - - - - - - - - - - - - - - - 2b:.6% _ - - - - - - - - - - - - ~ - - - 78.3% - - - - - ..: - - - - - - - - - - - 10. 7% Total~ - - - - - - - - - - - - -113.6% 7. Evidence of Growth: Average length ,·men planted - - - - - - - - - 8 .5" Average length, 1946 catch - - - - - - - - - 12.J" ( 6) Average length, 1947 catch - - - - - - - - - 15 .1 11 (14) Average length., 1948 catch - - - - - - - - - 18.5" ( 1) Average growth, 1946 season - - - - - - - - - 3.8 11 Average growth, 1947 season - - - - - - - - - 2.811 Average growth, 1948 season - - - - - - - - - 3 .4n Averace gro,:rth, 1946 and 19h7 Season - - - - 6.6 11 Total Average Groi::th - - - - - - - - - - - 10 .on Tl7o of the fish reported caucht., one durine the 194 7 season and one duritle the 1948 season, had each increased its ueicht by eleven times, from one-fourth pound to tlro and three-quarters pounds • �- 14 8. Evidence ot Migration: 1946 - Of seven tagged fish caught during-1946, two were caught one-half mile below the reservoir, two were _ caught a distance of one hundred yards up the North Fol'k, two were caught a distance of one-quarter mile up the Colorado river-and one was caught in the reservoir. (The North Fork and Colorado are both tributaries to Shadow !fountain reservoir.) 1947 - Of fifteen tagged fish caught during 1947, seven were caudit belo,1 the reservoir (one of these approximately •t-rrenty-five miles· dovmstream), one vras caucht 2,0 yards up the North F-ork, one '\'las· caught in the Colorado river bet,7een Shadon J:ountain reservoir and Grand Lake and six were caueht in the reservoir. 1948 - Single reported catch tras made in the resei-J'oir. Of the twenty-three fish reported caucht, nine were taken below .the reservoir, eicht from the reservoir itself and six from tributary streams. • �1. Place of Plant= Shadow l!ountain reservoir, near Grand Lake July 29, 1947- • 2. Date· of Plant: 3. · Type 0£ Marl<ing: Metal jaw tags 4. Fish planted: 500 Rainbows, 500 Lochs S. Tags returned: Rainbows 1947 - - - - - - - $.8% ( 29) 1948 - - - - - - -· 22.2% (lll) Total - - - - 6. 28.0% (146) Return by Weight t Ounces Planted - - - - - - Rainbows Lochs 2,050 2,400 Ounces, reported catchr 1947 - - - - - - 1948 - - - - - - Total - - - - 260 65 1J861 806 2,121 Btt %of return by 1·:eieht t 1947 - - - - - - 1948 - - - - - - Total " - - - 12.7% 90.8% 103.5% 7. Eviden~e 0£ Growth 1 Rainbows Average length when planted 8.5" Average length, 1947 catch- - 10.arr ( 25) Average length, 1948 catch-- lJ .1 11 (102) Average growth, 1947 season 2 .3 11 Average growth, 1948 season 2 .J" Total average growth 4.611 Lochs 9.0 11 l0.4" ( 4) 12 .111 (57) 1.4" 1. 711 3.111 8. Evidence of Migrationc 1947 - Six tagged fish (5 rainbows and one loch) were caught in Grand Lake. ti!hen Shadow 1.Tountain reservoir is full, as it was during part of the 1947 season, these tvro bodies of rrater are connected by a narrow inlet.) �T - 16 1948 - or the :J.O7 rainbovrs reported.,. $1. were. caught below . Shadow }.fountain reservoir, 49 were caught in the reservoir, three were caught in the short·. stream section between Grand Lake at the reservoir and four wer~ caught in Grand Lake. or the do,mstream migration, or had . moved four miles, one had moved five mile s and one had moved 29 miles • • Of the 61 Lochs reported, 15 were caught below Shadow· Mountain reservoir, 35 were caught in the reservoir, eight were caught in the stream section between Grand Lake and the reservoir and three were caught in Grand Lake • One dovmstream migrant had· moved eight miles~ �- 17 - 1. Place of Plant: Shadow Mountain reservoir 2. Date of Plant: i August 17, 1948 3. Type of Marking: Metal jaw tags 4. Fish Plantedi 500 Rainbows, 500 Lochs 5. Tags returned: 1948 - - - - -ii - Rainbows - - - - - - - - 10.1'% (52) 6. Returns by Tleightt 2.8% (14) Rainbows -Lochs - - - - - - 2,050 1,700 Ounces·, reported catch , 1948 - - - 416 94 20.3% 5.5% Ounces planted ~ return by 17eight 7. Lochs Evidence or Grol7th: Rainbows Average l~ngth, ,men planted - - Average length, 1948 catch - - - Average growth, 1948 season 8. Evidence of migrat1:pn: a 19L8 - - - - - - - - None 8 .5" 10.511 (46) 2.0 11 - Lochs a.on 10.on (13) 2.on �- 18 l. Place of Plant: . . Taylor Reservoir above Gunnison 2. Date of Plant: July 14, 1948 3. Type or markingt Metal jaw tags 4. Fish Planted:·. 500 Rainbows, 166 Lochs 5. Tags returned: Rainbo,-:s 1948 - - - - - - - - - - - - - Lochs 11.o~ (.5.5) 6. Returns by 1feight: Rainbows Lochs ounces Planted - - - - - - - - - 2,050 531 Ounces, reported catch, 1948 - - 369 36 %return by weight, 1948 - :.. - - 18.0% 6.8% Rainbov,s Lochs 7. Evidence or Growth:Average lepgth v.rhen.planted - - Average length, 1948 catch Average growth, 1948 season - - - - -- 8-,tr 10.0" (40) 1 . .511 8.0fl 9 .4n (5) 1.411 a. Evidence of Migration: 1948 - Twenty-two rainbows (40% of those reported) and from Lochs (57% of those reported) were caught in Texas creek. None of the fish ,vere reported more than onefourth miles above the point vlhere this stream enters Taylor reservoir. �- 19 1~ Place of Plant: Valleci to :reservoir, near Bayfield 2. Date of Plant: April 19, 1947 3. Type of l.Iarking: Uetal ja,1 tags 4. Fish Planted:· 486 Rainbm1s, 498 Lochs 5. Tags returned: Rainbows Lochs Rainbows Lochs 1.,798 2.,042 594 797 ·896 1947 - - - - - - - - - - - - - 1940 - - - - - - - - - - - - - Total - - - - - - - - - - - 6. Returns by r;eight: Ounces Planted - - - - - - - - - Ounces, reported catch: · 1947 - - - - 1948 - - - - Total - - 232 1.,391 1-;mr Rainbm1s Lochs %of return by ,reight: 1947 - - - - 1948 - - - - Total - - 7~ Evidence of. groTlth: AveraBe length·when planted - - - ~ Average length; 19!~7. catch - - - Average length:; 1948 catch - - - Aver~ge gro,7th; 1947 season - - - Average grorrth, 1948 season - - - Total average gro,rt,h - - - - - - 8 .2511 10.911 (S9) 1,;211 (27) 2. 7" 4.3"11 7,0 8. Evidence of Eigration: 1947 - 1948 - None . 1 One loch was caught in the outlet spil.ll1B.yj t,10 lochs were caught a short distance up tributary streams. �' .. 20 -1. Place or Plant: -~iard Lake., Grand Mesa 2. Date of Plant: June 19, 1947 3. Type of l !arking: Eetal jaw tags 4. Fish Plantedt 400 Rainbovrs S. To.cs returned: 1947 - - - - - - - - - - - - 1948 - - - - - - - - - - - - Total - - - - - - - - - 20~0~ (80) .S% ( 2) 20-5% (82) 6. neturn by ,·:eight: Ounces Planted - - - - - - - - - - - - l,36o Ounces, reported catch: . ' 1947 - - - - - - 1948 - - - - - - - 432 18 Total - - - - ~ %of retum. by weight: 1947 - - - - - - - - 31.8% 1948 - - - - - - - - 1.3% Total - - - - - 33.1-J 7•.. 'Ev{dence of. Growth: Average length'when planted - - - - - - - - - Aver.age length; 194 7 catch - - - - - - - - ~ Averace length; 1948 catch - - - - - - - - - Average grO\·rth, 1947 season· - - ..; - - - - - ..; Averaee gro,rth, 19h8 season - - - - - - - - - Total·average gror.th - - - - - - - - - - - - 8. Dvidence or l!ieration: 1947 1948 None None • �- 21 1. Place or Plant: Bear Creek, between the to,ms. of Uorrison and :Cve:rgreen. 2. Date of Plant: Hay 20, 1947 3. Type of marking: I!etal ja1·r tags 4. 5. Fish Planted: 448 Rainbows, 448 Loch Leven Tags returned: Rainbows 1947 - - - - - - - - 1948 - - - - - - - - - 28.7% (129) .0% ( o) Total - - - - - - 6. Returns by Yieight: Ounces Planted -- - - - - - - - Lochs 24.1% (108) 1.6% ( 7) 25.7% {115) Rainbows Lochs 1,837 2,419 593 624 ~ 6n 32,3% 2,.8% 1.9% Ounces, reported catch: 1947 - ~ - - - 1948 - - - - - Total - - - - 0· 47 %returns by weight: 1947 - - - - - 1948 - - - - - ~ Total - - - 7. Bvid~nce of Growth: Average length nhen planted - - Averace length, 1947 catch - - Average length; 1948 catch - - Average growth, 1947 season - - Average growth, 1948 season - - Total average growth~ - - - - .o~ 32.3% 21.n nainbous Lochs 8.5"11 9.511 8.9 (58) --.4" 11 9 .1 (54) 10.0 11 ( 7) .2" .311 .511 B. Evidence of Migration: 1947 - Four lochs were caught· in Cub Creek, a small tributary to J3ear Creek at Evergreen. These fish had moved upstream from tvro hundred yards to one-quarter mile. 1948 - One loch was caught an undetermined distance up Cub Creek. �- 22 - 1. Place.of Plant: Chief and Republican Creeks, at ·uray 2. Date of Plantt April 20, 1947 3. Type of marking:_ Uetal jaw tags 4. Fish Planted: 5. Tags returnedi 498 Rainbows 1947 - - - - - - - - - - - - 1948 - - - - - - - - - - - - Total - - - - - - - - - - 31.3% (156) .2:t f 1) 31.5%1571 No data 7. Evidence of gro,·rth ; Due to v.:tri::-.tion in lengths of fish planted, 611 to 14", and a sincle return durin~ the 1948 season, no comparisons can be made. 8. f.:videnc~ of I"igration: 1947 - - - - 1948 - - - - - None None �- 23 1. Place of Plant: Grizzly river, from confluence vii th Col orado creek downstream to Col orado Highnay 14 bridge, Jackson County. 2. Date of Pl D.n.t: June 11, 19h7 3. Type of marking: 4. Fish planted: 5. Tags returned: Hetal jaw tacs 250 Rainbows 1947 1948 ,.,. Total - - 7.6% (19) --- 2 .o~s ( 5) 9.6% (20} .. 6. Returns by Weight: Ounces planted - - - - - - - - - 1,025 Ounces, reported catch : 1947 - - - - - - - - 1948 - - - - - - - - - 78 23 Total - - - - - - 101 % return by 1ileight: 7.6% 1947 1948 - 2.2% Total 9.8% 7. :::vidence of GroYrth: Average l e ngth when planted - - - - AveraGe length, 1947 catch - - - - Averace length, 1948 catch - - - - Average growth, 1947 season - - Average gr ovrth, 1948 season - - Total averaee grovrth - - - - - - 8. Evidence of l'ligration: 1947 - - - • 1948 - - - - - - - None None - - - - - - - - - - - - - 8.511 - - - - -4" 8 .511 (9) 8.9 11 (2) .ou , 411 �- 24 1. Place of Plant: l!iddl~ Fork or Uich~gan river., on Colorado State For·est near ·0ould. • + 2 • Date or Plant: • • • , June 13, 194 7 3. Type or marking: Uetal jaw tags 4. Fish Planted: 5. Tags returned: 250 Rainbows 1947 - - - - - - - - - - - - - -- 28.0% (70) 1948 - - - - - - - - - - - - - -- 1.6% ( 4) Total - - - -- - - ~ - ~ - -·- 29.6% (74) 6. . . Returns by Weight: •• Ounces planted - - - - - - - - --- - - i-~ - ·1;02$ Ounces, reported catch:· 194 7 - - - - ... .;, .· ..;; ._ - ..; ~ - · · 305· 1948 - - - - - - - - - - - 22 Total - - - - ,- - - - - -m- %of return by r:eight: 1947 - - - - - - ~ ._ - - - 1948 - - - - - - ~ - - - - Total - - - - - - - - 7. 29.7% 2.1% 31.8% Evidence o:f· G:rorrth: Average length when planted·- - - - - _:_ - - 8.5" Average length, 1947 catch - - - - - - - - - -· • 8. 711 (56) Average length, 1948 catch - - ~ - -·-·- - - .. 9~611 ( 4) Average growth, 1947 --season - - - - - - •• - - .2" Average growth, 1948 season·- - - - - - - ~ - .9" 1.1" • 'J.lotal average ·growth - - - - - - - - - - - - 8. Evidence ·of Migration: 1947 - - - - - - - - - - None 1948 - - - - - - - - - - None �- 25 l. Place of Plant: 2 • Date of Plant: Morth Fork of Poudre river below Seaman reservoir April 8, 1948 3. Type of marking: Metal jaw tags 4.. • Fish Planted: S. 180 Lochs (all resident) Tags returned: 1948 6. Returns by Weight: 576 Ounces planted - - - - - -.- - - - Ounces, reported catch: 1948 - - - - - - %of return by weight 1 1948 185 30.6% - - - - 7. Evidence of Growth: Average length ·when planted - - - - - - - - - Average length; 1948 catch - - - - - - - - Averace grO'\·rth, 1948 season - - - - - - - - - 8. Evidence of I.Iigration2 1948 - - - - - - - - None· 7.9" 9-3" (32) 1.411 �1. Place of Plant t Rifle Creek I at Rifle Mountain Park 2. Date of Plantt October 3, 1947 3. Type ot Markingt Metal jaw tags 4. Fish Plantedt 5. Tags returned: 200 Rainbows 1947 - - - - - - - - - 1948 - - - - - - - - - Total - - - - - - - 3.5% ( 7) 1.5% (15) 11.0% (22) 6. Returns by Weight t Ounces Planted - --- - - - - - - - - - - 820 Ounces, reported catcht 1947 - - - - - - - - - - 29 1948·- - - - - - - - - - 63 Total - - - - - - - 92 %return by ·:Feight: 1947 - - - - - - - - - - J.5% 1948 - - - - - - - - - - 1.1% Total - - - -·- - - ll.2% 7. Evidence of GroV1th i Average size when planted - - - - - - - - - Average size, 1947 catch - - - - ~ - - - - Average size, 1948 catch - - - - - -·- - - Average growth, 1947 season - - - - - - - - Average growth, 1948 season - - - - - - - - Total average growth - - - - - - - - - - - 8. Evidence of Migration a 1947 - - - - - - - - - None 1948 - - - - - - - - - None 8.S11 8.511 ( 4) 8.6" (15) .6" .1" .l" �- 27 1. Place of Plantt Upper Willow Creek, near Granby 2 • Date of Plant: September 17, 1947 .3 • Type of lJarking r :Uetal jaw tags 4. Fish Plantedt (All resident fish} 21 Natives (Blackspotted) 17 Brooks 7 Native - Rainbow crosses 6 Rainbows 1 Loch ,. Tags returned: Natives Brooks Crosses Rainbows Lochs 1947 - 0 0 0 0 0 1948 - 0 6% (1) 29% (2) 17% (1) 0 Total - 0 6% (1) 29% (2) 17% (1) 0 .. 6. Returns by r:eight: Insufficient data. 7. Evidence of grorrth: Reported lengths of catches during 1948 season indicated growth as follom: Rainbov,:. From 9" to 1011 , increase of 111 Brook: From 9" to 10 11 , increase of 1 11 Crosses: From 7½" to 811 and.9 11 , average increase 1/211 8. Evidence of l1igration: 1947 - - - - - - 1948 - - - - - - - None None �.., - 28 . 1. r • Place of Plant:· Colorado river, Glemvood Springs upstream to Shoshone poT18r plant outlet. 2. Date or Plant: January 21, 1947: 3. Type or Harking: Metal jaw tags 4. Fish Planted: 997 Rainbows $. Tags returned: 1947 - - - - - - - - 12.6% (126) Total - - - - - 12.6% (126 1948 - - - - - - - - .0% ( 0~ 6. Returns by Weigh~• . Ounces planted - - - - - - - - - - - - - - - .6, ~O Ouncef>·, reported catcht 1947 - - - - - - - - - - - - - ~~ 932 ------------0 Total - - - - - - - "".' - - - 932 %return by ~:!eight: 1947 1948 Total - - - - - - - - - - 7. Evidence of growth: Average length when planted - - - - - - - - ~ Average length, .1947 catch - - - - - - - - Average growth, 1947 season - - - - - - - - - 10.0" 10.3 11 (56) .311 8. Evidence of Uigration: 1947 - Three fish were caught from 20 yards to, three-fourths of a mile up small tributaries; five were caught in the Colorado river from one-quarter mile to tvro miles above the planting section; one fish was caught at Rifle, twenty-four miles below the planting section. 1948 - None �- 29 1. Place of Plants Conejos river, belo,1 Spectacle ~e 2. Date of Plant r Week of May 1, 19li7 3. Type of marking: Metal jaw tags 4. Fish Planteds 5. Tags retumed: 1000 Rainbows 1947 - - - - - - - - - - - - - - - - 1948 - - - - - -· - - - - - - - - - .. Total - - - - - - - - - - - - - - 10.4% (104) .4% ( 4) 10.8% (108) 6. Returns by Weight: Ounces Planted - - - - - - •- - - --- - - - - 4,100 Ounces, reported catch: 1947 - - - - - - - - - - - - - 19L8 - - - - - - - - - - - - - - 499 19 - - - - - - - - - - - 518 1947 - - - - - - - - - - - - - 1948 - - - - - - - - - - - - - - 12.2% Total %return by ·.-reight t To'ta.l - - - - - - - - - - - .5% 12.7% 7. Evidence of Grovrth t Average length when planted - - - - - - - -.- 8.5" Average length, 1947 catch - - - - - - - - - 9.011 (85) Average length, 1948 catch - - - - - - - - - - - 9.0" ( 2) Average gro1uth, 1947 season - - - - - - - - - - - •.511 Average growth, 1948 season - - - - - - - - - - - .011 Total average growth - - - - - - - - - - - - - .511 8. Evidence of migrationl 194 7 - - - - - - - - - - - None 1948 - - - - - - - - - - - None �.t' .. 30. - 1. Place of Plant: Gunnison river, Gunnison to Iola Bridge 2. Date of Plant: May 15, 1947 3. Type of marking: Metal jaw tags· 4. • Fish Planted: 992 Rainbows 5. Tags returned: 1947 - - - -·- - - - - - - - - - 1948 - - - - ·-· - - - - - - - - - - 1,.0% (149) .3% ( 3) 15.3% (152) 6. Returns by Tleight: Ounces Planted - - - - - - • - - - - - 4,067 Ounces, reported catch:- - - - ~ - - - - - 715 1948 - - - - - - - - - - - - - - 37 1947 - - - - - - - - - - - - Total - - - - - - - - - - ~ %return by Ueight: 1947 1948 Total - - - - - - - - - - 7. Evidence of Gro-wth: 8.5~t Average length when planted-·- - - - - - - 9.0° {12.3) Average length-, 194 7 catch - - - - - - - - Average length, 1948 catch - - - - - - - - - 11.911 ( 3) .511 ·Average growth, 1947 season - - - - - - - - Average growth, 1948 season - - - - - - - - 2.9" 3.4n . Total average growth. - - - - - - - - - - 8 o Evidence of r.agration: ·1947 - Five tagged fish were caught below the Iola Bridge, one three-fourths of a mile, one 1-mile and three an undetermined distance. 1948 - None • �- 31 1. Place or Plant r Gunnison river, Gunnison to Iola bridge 2. Date or Plant1 August 15, 1947 3. Metal jaw tags Type of marking: 4. Fish planted: 200 Lochs 5. Tags returned: 1947 - - - - - - - - -·- - - - - - 1948 - - - - - - - - - - - - - - - Total - - - - - - - - - - - - - 20.5% .0% 20.5% (41) 0) 41) f 6. Returns by -rreight: Ounces Planted - - - - - - - - - - - - - - - - 2,560 Ounces, reported catch: 1947 - - - - - - - - - - - - - - 1948 - - - - - - - - - - - - - - Total - - - - - - - - - - - - 558 0 556 %or return by weight: 1947 - - - - - - - - - - - - - - - 21.8% 1948 - • - - - - - - - - - - - - .0% Total - - - - - - - - - - - - 21.8% 7. Evidence of Growth: Average size when planted - - - - - - - - - - Average size, 1947 catch - - - - - - - - - - Average growth, 1947 season - ~ - - - - - - - 8~ Evidence or Migration: 1947 - - - - - - - - - - - None 1948 - - - - - - - - - - - None 12,0 11 12 .311 (16) .J" �'Y - 32 1. Place of Plant: Gunnison river, Gunnison to Iola bridge. 2. Date of Plant: August 29, 1947 3. Type of marking: Metal jaw tags 4. 5. Fish Plantedt 464 Lochs Tags returned: 1947 - - - - - - - - - - - -·- 1948 - - - - - - - - - - - - - - Total - - - - - - - - - - - 3.6% (17) )o0% (14) 6.6% (31) 6. Returns by 1TeiGht: Ounces planted: - - - - - - - - - - - - 1,902 Ounces, reported catch1 1947 - ~ ~ - - - - - - - - 1948 - - - - - - - ~ - - - ~ Total - - - - ~ - - - - 70 112 I8'2" %return byweightt 1947 - - - - - - - - - - - 1948 - - - - - - - - - - - - Total - - -·, -,- - :- -· ·- 7. Evidence of Grorrth z Average length when planted - - - - - - - Average length, 1947 catch - - - - - - - Average length, 1948 catch ~ - - - - - - Average growth, 1947 season - - - - - - - Average growth, 1948 season - - - - - -· - • '!lot~l averag{j! growth - - - - - - - - - - - - 8-511 - - 8.5" - - 10~5" - .on -·•- 2.on - - 2 .on (15) (14) 8. Evidence of Higrat ion: 1947 - - - - - - - - - - None 1948 .. One 4;ish l7as caught one mile belorr the planting section and one uas caught four miles bel011 the planting section. �- 33 1. Place of Plant t Michigan river, Jackson County, on Brownlee, Richards and Simson ranches. 2. Date of Plant r October 14, 19h7 3. Type of ::arkinc;: I~etal jaw tags 4. Fish Planted: 2h7 Brooks 5 • .Tags returnedt. 1947 - - - - - - - - - - - - - .0% (0) 1948 - - - - - - - - - - - - - - 13.7% (34) Total - - - - - - - - - - - 13.7% (34) 6. Returns by Ueight: Insufficient data 7. Evidence of Grovith: Insufficient data. Average weight when planted, 1.25 pounds. 8. Evidence of liigration: 1948. Twenty-one of these fish, or 62% of those reported, were caught in the area of the plant. Thirteen, or 38%, rrere caucht do'WJlStream from the area of the plant, as indicated below. Iuileage does not include stream meander. Tvrelve, or 35% of the tags reported, were caught in :·:yorning. • -1 - 15 miles do,mstream 2 - 17 II II .J. - 23 n n 11 1 - 24 l - 25 II 2 - 37 l - 53 1 .. 55 1 - 63 1 - 72 l - 84 11 �., 1. Place of Plant: !forth Platte river on liallon ranch, Jackson County 2. Date of Plant: June 12, 1947 • 3 . Type of marking: I ~etal javr tags 4. Fish Planted~ 500 Ra.inbovrs 5. Tags returned: 1947·- - - - - - - - - - - - - - - - - 26.0% (130) 1948 - - - - - - - - - - - - - - - - - • 1,4% f · 7) Total - - - - - - - - - - - - - - 2794% 137) 6. Returns by: weight: Ounces planted - - - - - - - - - - - - - - - - 2,400 Ounces, reported catch: 1947 - - - - - - - - - - - - - - - 871 1948 - - - - - - - - - - - - - - -- 64 Total - - - - - - - - - - - - 935 %return by ueight: 1947 - - - - - - - - - - - - - 36.3% 1948 - - - - - - - - - - - - - ._ - - 206% Total - - - - - - - - - - - - - 38.9% 7. • Evidence of GroYrth: Average length when planted - - - - -.~ - - - 9.011 Average length, 1947 catch - - - - - - - - - - 1000 11 (101) Average length, 1948 catch - - -· - - - - -- - 1009 11 ( 7) Average gro·wth, 1947 season - - - - -· - - - - - · lo0 11 Average growth,; 1948 season - - - - - - - - - c.9 11 'J!otal average growth - - - - - - ·- - - - - - 10911 8. Evidence of l'.iigration = 1947 - Eleven tagged fish V1ere caught below the area of the plant, the distances varying r'rom one-quarters to one-half mile. 1948 - Two tagged fish were caught an undetermined distance up the Roaring Fork and one tagged fish vras caught an undetermined distance up the North Fork. Both of these streams are tributaries to the Horth Platte in the vicinity of the planting area. �- 35 1. Place of Plant: North Platte river, on Ballon ranch in Jaclson County. 2. Date of Plant~ Octob~r 21, 1947 3 . Type of markinr: l!etal j mT tags 4. Fish Planted: 248 Brooks 5. Tacs returned: 1947 - - - - - - - - - - - - - - 1948 - - - - -.- - - - - - - - - Total - - - - - - - - - - - 6. Returns by ·weight: Insufficient data 7. Evidence of Grorrth: Insufficient data. 8. Average weight ,·then planted, 1 .5 pounds. Evidence of liigration: 1948 - Forty-three, or 69% of the tags returned, were caught in the area of the plant. Two, or 3%, ,1ere caught above the area and 17, or 28%, ~ere caught below the area planted. Five, or 8%, were returned from Wyoming. Distances are indicated below. Upstream: 2 - Undetennined distance up the Roaring Fork, a tributary to the North Platte river in the vicinity of the planting area. Do,mstream: 5 - 1/2 mile 2 - 1 2 - 2 1 - 5 l - 12 l - 14 II II 11 11 II 1 - 18 1 - 67 l - 72 1 - 77 " " 1 - 79 " II II �,. . - 36 1. Place of Plant: South Platte river, 1-mile section on Uigwam Club above Deckers (Fish purchased by ,.-Iigwam Club from private hatchery.• ) . 2. Date of Plant: August 6, 1947 3. Type of markinc: !!etal javr tags 4. Fish Planted: ,500 Rainbo\75 5. Tags returned: \1igwam Club members recorded tagged fish caught on the Club property. Returns- from above and below the Club property were mailed to the Denver office by cooperating fishermen. From Club Area· Above Club Area Be°low Club Area 1947 - - - - - 1948 - - - - - Total - - - 21.2% (106) .2% ( l) 21.4% (107) Total returns - - - - - - - - 6.8% (34) .2% ( 1) 1.0% (35) 6.4% (32) .8% { 4) 7.2% (36) 35.6% 6. Returns by \"jeighti Returns by weight yield the same percentages as tags returned (5 above), since plant and catch sizes were t~e same. 7.· Evidence of Grorrth: Averaee length·,·rhen planted - - - - - - - - - - Avernee lenrrth; 1947 catch - - - - - - - - - - Averace leneth, 1940 catch - - - - - - - - - - Averace grotrth, 1947 season - - - - - - - - - - Average grouth, 1940 season - - - - - - - - - - - 8. 10..511 10.511 (138) 10.5" •( 4) .on _.0" Evidence of I.'iigration: 1947 - %caught less than 1/4 mile from place or plant - 38.8 %caught mor~ than 1/4 mile upstream - - - - - - - 29.7 %caught more than 1/4 mile downstream - - - - - - 36.5 Average movement in miles, upstream migrants - - .46 Average movement in miles, dovmstream migrants - .38 Greatest movement upstream, miles - - - - - -· - - 2.0 Greatest movement downstream, miles - - - -· --- - 1.75 1948 - Of six tagged fish reported caught during the 1948 season, one was caught above the club property, one 1vas caught on the club property and four were caught below the club property. �- 37 - 1. Place of Plant: 2. Date of Plant: Poudre river, from t,vo and one-half miles above the Roosevelt Uational For('lst boundary to twenty miles above. • • • • l!ay J, 1947 3. Type of marking: lletal jaw tags 4. Fish Planted: ,00 Rainbovts and· 500 Lochs S. Tags returned: Rainbows 1947 - - - - - - - - 1948 - - - - - - - - Total - - - - - - Lochs 22.2% (lll) .4% ( 2) 22.6% (113) 12.6% (63) .2% ( 1) .12.8% (64) 6. Returns by Weight: Ounces Planted - - - - - - - - Rainbows Lochs 1,700 1,700 466 290 Ounces, reported catch: 1947 - - - - - ~ 1948 - - - - - - %Return by r;eight: 1947 - - - - - 1948 - - - - - - 7. Evidence of Gror,th: Average length when planted~ Average length, 1947 catch Average length, 1948 catch Average growth, 1947 season - 8 474 5 295 27.4% • t'rl •:;J1J 27.9% Rainbows Lochs 8.0" a.on a.611 (97) a.9 11 c,1> (Ho lengths included) .611 .9" 8. Evidence of r::igration: 1947 - One Loch was caught five miles below the lowest point of the plant. One rainbow was caught an undetermined distance up the Little South, a tributary to the Poudre river in the area of the plant. �"f - 38 1. Place of Plantt Poudre river, Roaring Fork to Crane Gulch 2. Date of Plants March 12, 1948 3. Type of marking: Metal jaw tags 4. Fish Planted: 5. Tags returnedt 49 Rainbows, 4 Lochs Rainbows 1948 - - - - - ~ Lochs 30.6% . (15) . 6. Returns by Tie~ght: No data 7. Evidence or GroTlth: Mo data . 8. Fish planted uere la~ge., r rom 2 pound to 6 pounds Evidence of migrationt None �C. - 39 l. Place of Plant I Rio Grande river, from one and one-hall' miles above South Fork to conflu.ence vdth Goose creek. 2. Date of Plant: April 28, 19!~7 .3. Type of marking: Uetal jaw tags 4. Fish Planted: 998 Rainbo,"IS 5. Tags returned: 1947 - ~ - - - - - - - - - - - 17 .5% (175) 1948 - ~ ~ - - - - - - - - - 1.4% ( 14) Totai - - - - - - - - - - 18.9% (189) 6. Return by Ueicht: Ounces planted - - - --- - - - - - - - 4,092 Ounces, reported catch: 1947 - - - - - - - - - - 1948 - - - --- - - - - - Total - - - - - - - - 753 90 7JiiJ %return by weight: 19L7 1948 Total - - - - - - - - 18.4% 2.2% 20.6% 7. Evidence of Ort wth: Average size men planted - - - - - - - - - 8.5" Average size, 1947 catch· - - - - - - - - - 8. 7" (132) Average size, 1946 catch - - - - - - - - - 9.9n ( 16) Average growth, 1947 season - - - - - - - - .2" Average growth, 1948 season - - - - - - - - - - 1.2 11 Total average growth - -.- - - - - - - - 1.4" 8. Evidence· of Iligration: 1947 - Three tagced fish were caught at points 11, 16 and 17½ miles belo,·r the lo,·rest point of the plant, and one an undetermined distance beloYr this point • One tageed fish uas caught an undetermin~d distance up the South Fork,a tributary to the Rio Grande river, 1-} miles below the lotrest point of the plant. 1948 - Two tagged fish were caught at a point 16 miles below the loTrest point of the plant, and one tagged fish was recovered 3 miles below that point. �"f - 40 1. Place of Plant: Taylor rivc·r, from Alr.lont to six miles above. 2. Date of Plant: !.lay 16, 1947 3. Type of r.iarking: Uetal ja,7 tags 4. Fish Planted: 998 Rainbows 5. T~gs returned: .1947 - - - - - - - - - - - 13.6% (13,) 1948 - - - - - - - - - - .5% ( ,) To.tal - - - - - - - - 14.0% (140) 6. Returns by Tieight: Ounces Planted - - - - - - - - - - - - - 4,092 Ounces, reported catch: 1947 - - - - - - - - - - 1948 - - - - - - - - - - Total - - - - - - - - 608 39 047 %return by \Veight: 1947 1948 ------- - - - ~ Total - - - - - - - -· 1b;9% 1.0% 15.9% 7. :Svidence of grm·rth: Average length·vmen planted - - - - - - Average length; 1947 catch - - - - - - . Average length; 1948 catch - - - - - - Average growth, 1947 season - - - - - - Average grovrt,h, 1948 season - - - - - - Total average grolrth - - - - - - - - 8. 8.511 8.8" (ill) 10.h" ( 5) .. 3n 1.611 1.9n Evidence of lligration: 1947 - Twenty-three tagged fish were caught in the Gunnison river {the Taylor and East rivers meet to form the Gunnison river at Almont). These fish had moved downstream distances varying from one-eighth mile to 36 miles, and averaging 4.07 miles. This represents 17.1% of those caught and reported during the 1947 season. 1948 - Three tagged fish were caught in the Gunnison river, one 1½ miles below the lowest point of the plant, one four miles below and one 27 miles below. These fish represent 60% of those caught and reported during the 19h8 season. �• 4 . 1. Place of Plant r Taylor river I Almont to tour miles above •. 2. Date or Plant:, August JO,. 1947 3. Type of markingr Metal jaw tags 4.- Fish Planted,· 449 Lochs 5.. Tags retumedr 1947 - - - - - - - - - - - - 1948 - - - - - - - ~ - - - - Total - - ~ - - ~ - - - - 6. Returns by Weight: Ounces Planted - - - - - - - - - - - - - 1,841 Ounces, reported catchr 19~7 ~ ~ - ~ - - - ~ - - - - - 1948 - - - - - - - - - - - - - - . 157 Total - - - - - - - - - - - 96 253 %return by l7eight,· 1947 - - - - - - - - - - - - - 1948 - - - - - - - - - - - - - Total - - - - - - - - - - - 7. Evidence of Growth: Average length when planted - - - - - - - • Average length, 1947 catch- - - - - - - - - Average length, 1948 catch - - - - - - - - ·Average growth, 1947 season - - - - - - - - Average growth, 1948 season - - - - - - - - Total Average growth - - - - - - - - - - - 8.5" 9,011 (18) 9.611 (26) .5" .6" 1.1" 8.· Evidence of I:Jigration: 1947 - Four tagged fish were caught in the Gunnison river, having moved dcnmstream an average of 2.1 miles and a maximum of 7 miles. This represents 20% or all marked•fish caucht and reported from this plant during the 1947 season, -1948 - Seven tagged fish were caught above the upper point of the plant. _These fish had moved upstream an average of 2 .9 miles and a maximum of six miles. One tagged fish 1·,as .:caught 18 miles beloTr the lowest point of the plant and another ,ms caught 59 miles belol7. 32% of all tagged fish cauc}lt and reported from this plant during the 1948 season had moved either above or belon the planting section. �7 • - 42 1. Place of Plant t Big Thompson river, from four miles below Estes Park dmmstream ·to the Dam store ..• 2. Date of Plant: liay 16, 1947 J. Type of marking: Hetal jaw tags 4. Fish Planted: 5. Tags returned: 500 RainbmTs , 500 Lochs Rainbows 1947 - - - - - - - - - - 22.2% (111) 1948 - - - - - - - - - .0% ( 0~ Total - - - - - - - 22.2% (111 Lochs 21.6% (108) f .It! 2) • 22.0%iio) 6. Returns by Weight: Rainbows Lochs 2,400 1,700 577 486 21 Ounces Planted - - - - - - - - Ounces, reported catch: 1947 - - 1948 - - - 0 !77 ~ 1947 - - - ;.. - - - - 24.0% 1948 - - - - - - - .0% 24.0~ 28.6% 1.2% 29.8% Rainbows Locha 9.011 a.0 11 8.8 11 Total - - %return by weight t Total - - - - - 7. :Svidence of Grorrth: Average length when planted - - - Average length; 1947 catch - - - Average length, 1948 catch - - - Average growth, 1947 season - - - Total average growth - - - - - - 9.411 .411 --.8" -- 8. Evidence of Migration: 1947 - One tagged loch·was caught 1/4 mile up the North Fork a tributary to the Big Thompson at Drake., within the planting area. • 1948 - None ---~ ~ �, JI •. - 43 1. Pla'ce of Plant: 2. Date of Plant: Big Thompson and lm'ler Fall rivers, near Estes Park July 28, 1948 3 • Type of marking: lletal ja,1 tags 4. Fish Planted: 5. Tags returned: 154 mixed Rainbows, Natives and Lochs 1948 - - - - - - - - - - - - - - 3,.1% (SS) 6. Returns by Weight: • No data 7. Evidence of Growth: These were large fish, 10" to 2411 in length and no attempt was made to check on possible growth. 8. Evidence of migration 1 None �- 44 li Place of Plant: 2. Date of Plant: Big Thompson river and Fall river, below Rocky ~ountain National Park. August 26, 1947 .3 • Type of marking: l~etal jaw tags 4. Fish Planted: 98 Rainbows., 52 Lochs 5. Tags returned: Rainoows - 1947 - - - - - - - - ~ - - 11,2% (ll) 1948 - - - - - - - - - - 1~0% ( 1) Total - - - - - - - - -Uo2% (12J Lochs 5.8% (3) 2.0% (1) 7,,8~ (4) 6. Returns by i-,·eight: No data 7. Evidence of Growth: These ~ere large fish (1-5 pounds each) and any growth data would not be representative of nonnal plants. 8. ~ Evidence of I~igration: 1947 - - - - -'- - - - 1948 - - - - - - - - - - None None �- 4S 1. Place of Plantt 2. Date of Plant: Big Thompson river below North Fork April 22, 1948 3. Type of marking t Ueital jaw tags 4. Fish planted t 5. Tags returned: 200 mixed Rainbows and Lochs 1948 - - - - - - - - - - - - - - - 31.0% (62) 6. Returns by weight t No data 7. Evidence of Growth r These ,vere large fish, averaging 1-1/4 pounds each, and no attempt uas made to check on gror:th. ' 8. Evidence of :~igration: Fifteen tagced fish 110re caught above the upper point of the plant; average upstream movement of these fish nas 2.6 miles and maximum was ,.o miles. �1.. Place or Plant I 2. Date of Plant: White river , on Rio Blanco ranch above Buford September 6, 1947 3. Type of marking: Metal jaw tags . 4. Fish Planted: JOO Rainbows - upper area JOO Rainbows - lower area 5. Tags returned: {Lo,·rer area only; upper area not open) Planted in lo1Ver area 1947 - - - - - - - 1948 - - - - - - - - (33) 3.6% ( 8) 11.0% 14.6% Planted in upper area. Caught in lower area 2.0% (6) 1.3% (4) 3.3% {10) (41) 6. Retums by, Weight~. Ounces planted - - - - - - - - - - - - - - 3,JOO Ounces, reported catch: 1947 - - - - - - - - i948 - - - - - - - - Total - - - - - - 389 130 -m %return by Weight: 1947 - - - - - - - - 1948 - - - - - - - - Total - - - - - - 7. Evid~nce of Growthi Average length when planted - - - - - Average length, 1947 catch - - - - - - - Average length; 19h8 catch - - - - - - - Averaee grovrth; 1947 season - - - - - - - Average grovrth, 1948 season - - - - - - - Total average gro,vth - - - - - - - - - - 11.5" 11. 75" (31) 13.1011 { 9) .2511 1,35" 1.6o" 8. Evidence of ! Iigration: 1947 - 2% of the tagged fish planted in the upper (closed) area were caught in the lower area. One tagged fish planted in the lovrer area was caught 10 miles belov, the lowest planting point. 1948 - 1.3% of the tagged fish planted in the upper area were caught in the lower area. �- 47 1. Place of Plant: 2. Date of Plant: Yampa river at. Steamboat Springs June 27, 1947 .3. Type or marking: l!etal jav, tags 4. Fish planted: 48 RainbOTTS 5. Tags returned: 1947 - - - - - - -·- - - - - - - - 44.0% {21) Total - - - - - -·~ -·- - - - 44.0% (21) 1948 - - - - - - - - - - - - - ~ - .a% ( o) 6. Returns by Weight: Ounces Planted - - - - - - - - - - - -· - - - 768 Ounces., reported catch: 1947 - - - - - - - - - - - - - - - 3.36 1948 - - - - - - - - -· - - - - - - 0 ·Total - - - - - - - - - • - - ~ %return by Weight: ~47--------------1948 - - - - - - - - - - - - - - - ~ 0% ~ 7. Evidence or Gro,Tth: Average length v.rhen planted - - - - - - - - - - Average length; 1947· catch - - - - - - - - - - Average growth., 1947 season - - - - - - - - - - 8. lJ.0" lJ.O" .011 (14) Evidence of l!igratiom 194 7 - One tacged fish was caught one and one-quarter miles up Ual ton creek., a tributary to the Yampa river above the planting section. This fish had moved upstream two anc three-quarters· miles.. �... -, ·- 48 1. Place of Plant: North Sterling reservoir, near Sted ing 2. Date of Plant: April 14, 1948 3. Type of marking: lietal ja,·r tags il 4. 5. Fish planted: 478 Rainbows Tags returned: 1948 - - - - - - - --• - - - - - - 8.1% (39) 6. Returns •by Weight: Ounces Planted: - - - - - - - - - - - - - - 3,203 Ounces, reported catch: 1948 - - - - - - - - - - %returns by weight, 1948 - - - - - - - 621 19 .4% 7. Evidence •of Growth: Average length when planted - - - - - - - Average length, 1948 catch - - - - -·- - Average gronth, 1948 season - - - - - - - - 10.on 12.711 (37) 2.7 11 8. Evidence o":r 1-Iigration: Four of these tageed fish were caught in the outlet ditch to North Sterling reservoir. ,... "I . ... �. - 49 1. Place of Plant: 2. Date of Plant: Two Buttes reservoir, south of Lamar April 17, 1948 3. Type of marking: Metal jaw tags 4. Fish Planted: 5. Tags returned: 500 Rainbows 1948 - - - - - - - - - - - - - 6. 5.4% (27) Returns by Weight: Ounces Planted - - - - - - - - - - - - - 3,350 Ounces, reported catch: 1948 - - - - - - - - - - - 419 %returns by ,1eight, 1948 - - - - - - - 12 .5% 7. I:vidence of Grorrth: Average length ,men planted - - - - - - Average length, 1948 catch - - - - - - Average gro\'Tth, 1948 season - - - - - - 8. Evidence of Migration: 1948 - - - - - - - - - - - - None 10.0 11 12 .5 11 (27) 2 .5" �~ I. Title I The Inves·tigation or the E. R. Bonham Pond near Willard, Colo. II. Dates March 21, 1949 III. Supervisors IV. Investigator: v. Introductioni R. H. Hess, Supt. Research and Distribution T. M. Lynch, Fish Technician A request was made by Mr. E. R. Bonham to the Department with regard to having his pond stocked with fish. VI. Pond History, The pond was built in 194!, it contains t'Wo and a halt acres and is eight feet deep. The pond is spring fed. The State stocked the pond with bass, crappie, perch and bullheads, in 19lal. About 6oo trout were stocked in the pond in 1945. The pond has always been opened to public fishing and the fishing pressure is very heavy. It is the only place to fish in the area. The pond has been fertilized several years. with manure• VII. Present Status of Pond• It is evident that the pond has been somevmat over-fished. The few fish that are left are five inch crappie, and eight·inch bullheads. An average or 10 fishermen fish the pond during summer weekends. Fishing was poor last year for the first time since the pond was stocked. VIII. Diaccussiona Mr. Bonham would like to have the pond stocked with 200 trout this spring to care f'or fishing pressure during the summer months and then • stocked with warm vater i'ish this i'all. IX. Recommendation: 50 bass per acre or 125 bass 1 .5'00 forage fish such as bluegill or crappie per acre should be placed in the pond by tall. Fish may be stocked from the salvage operations on North Sterling this fall. trout should be stocked at some time during this spring. 200 �o \al -- 0 Ila - .- . . - ~ 01 ft i, I\ - - ti ~ i4' cto Vl ffi !f f;:bl e:fi~IMt;,vtJ\I\ e-~~~M i,~..,. e-rf "'t: fi'fll1 t! ~ a ii <> it le - • ~11 ~, ~ ~ ' ti i=f -~ - r:• II!:""' M O ea i i ' :f ~ O • f 1?i 11 •i · 0 f i, ~ •• t '· ~~ ~-··ii I pi;1 :JirJ!:l~!l!f !!I i •!jiiii I i , -~ - j::t C ~~~ ~1.-~.-~~ ag.p.~ ij .... !~1 ~i ~~ij!I f ti: 1-... !;;! '> l~. n_tf I ! 1 - f.tll • rl,.·. tcll o - ftiil ;~ lf(t;~ ~ o a.t 1 lf!i! itn!!ifil!ii !:1 -r itr,!iJ ! t ~ !il I- !:i 5 -1~ I i(~d_'i: 1~,o:lit: fl)~ ,, I ! ,~~ lfmlai~~tll~ f 1::1~ ! ~ilii !iiii!4i:!fii':; f:° " (· 1 ( '";- ~ ' . �t:· -- I Vtto ~ndatiomi • 1o 01.ear Credt should be plaeed on the ~ ~17 ple.ntblg ~ l e and stoc'kad a c ~ to suitabili~o 2(), fh9 pls.ntd.ng faotor for the ~ below ldabo Sprioga shGl!ld be mater.Lall:, lmJer than that abower �• I. Title: Progress Report, Fisheries Research Investigations, Parvin Lake (Larimer County). II. Date: April 22 to December 31, 1949 III. Supervisor: Vl . IV. Personnel: D. E. Roberts, R. w. Lehti, and various members of the Fi sheries Research Staff. V. Introduction: D. Klein, Supt. of Fish Research Parvin Lake is located in the s.E. 1/4, Section 34, T. 10 N., R 73 n. , 6th P.H. approximately forty road miles northwest of Fort Collins, Colorado. fluctuation. The surface area is 61.9 acres rr.Lth very little The lake is predominately shoals, reachin~ a maximum depth of thirty- ti:m feet adjacent to the earth-fill dam. J\ ecreened rock spill- way l ocated in the center of the dam and a bottom tube form the o'..ltlets of the lal~e. The shore vegetation is essentially coniferous uith Ponderosa Pine and Douglas Fir predomnant. Numerous sedges and forage grasses make up the understory. The lake is easily reached by fishermen on a well graded gravel road. Boats are restricted, but bank fishing is allowed. The lake was constructed in 1926- 27 initially as a spawning station. Permanent installations nere built and a r esident superintendent pr ocured. This station rras maint ained as such until 1943 nhen the lake vras opened to fishing for a period of one month. opened nith restricted seasons. 0ince then, the lake has been This years season extends from Jiay 25 to October 31. An intensive study of the trout and of their habits in Parvin Lake was initiated in early 1949 nith the hope that a number of questions which pertain to ma."'<imwn utilization of hatchery reared fish could be answered. 11mr,r,,~,,,~,,,,,~rn11i[111i~~~~1,111i,~iij11 BDOW027893 �.. Environmental studies are l imited to those ·which will have definite practical value and application to Fisheries iiianagement. VI. Operations: A. Stocking Fish stocked in 1949 were as fol lows: Barch 1, 1949 2200 Legal Rainbows - u ntagged 500 Legal RainboY,s - tagged 500 Five- inch Rainbons - marked. June 14, 1949 480 Legal Rainbov1s - tagced 500 Five- inch Rainbows - marked. August 1, 1949 430 Legal Rainbows - tagged 500 Six-inch Rainbows - marked August 15, 1949 10,000 Two inch Rainbovrs (5,000 marked) August 18, 1949 1,500 Legal Rainbows - untagged August 19, 1949 1,800 Legal Rainbows - untacrned October JO, 1949 500 Legal Rainbows - tagged 500 Five- inch Rainbows - marked !To attempt was made in 19h9 to obtain a total creel check. Research personnel spot-checked the lake every day and checked extensively on days vrhen the fishing pr essurG -v1as great. A gate register was maintained at the lake entrance to obtain pertinent information from unchecked fishermen. �. - 3 Actual checks and the register were compared t o eliminate any duplication in tag numbers. TABLE I FISHEF.:.lAN RETUR}JS - TAGGED STOCKED FISH Size Classes March Plant June P::!.ant August Plant Total Stocked Returns 611 - 71.11 2 0 0 1 1 311 - 9½11 11 22 22 55 10 11 - 11_],i.! 11 60 101 3 164 12" - 131l" 11 46 43 1 90 14u - 154t .. 11 0 1 0 1 16 11 - 17½" 0 0 0 0 18 11 and above 0 0 0 0 _l-1 7 0 20 130 174 27 331 Tag returns Gate Register 132 ~ ~ 269-~ TOTAL TAG RETUTu1S 262 269 68 600➔i- ~ Size not recorded Total -::- - Plus one fish - October pla:-it - Gate Register Tabled tag returns indicate that approximately thirty-one percent of the total tagr~ed fish stocked were caught during 1949. The October plant should be deleted in this computation as there rras only one day of fishinG left ':rhen the plant Yras made . This rrould result in 5?9 tac::;ed fish r eturned from 1,410 stocked, and represents 42 . 5 percent . This is definitely a minimum figure because there were undoubtedly fishermen VIho vrere not checked and uho als o ignored the gate recister. �• 4 Returns from the I:Iarch and June plants are very similar, 1·rhereas the August plant returned fevrer fish to the creel. This can be ex- plained, in part, by the normal decrease in fishing pressure in late August, September, and October, which would necessarily effect the numbers of the August plant returned as compared to the earlier plants. B. Trapping Trapping facilities on the inlet stream, that were orig- inally used during previous spawning operations, were utilized. An up- stream trap ,vas operated from April 22 through the spring spawning run of the rainbow trout. stream. The fish were tagged, measured, ar.d pass·ed up- On Hay 26, 1949, the trap was rearranged converting the center weir and trap into a dovmstream trap. This was operated successfully until June 4, uhen abnormally high water prohibited effective use of the trap and allowed fish to by-pass the trap on their return to the lake. This condition lasted approxiJnately one week until the inlet stream receded sufficiently to catch fish. Thirty-one of the tagged legal rainbo,-rs planted in l.Iarch were trapped going upstream. These ,~rere passed upstream along with the resi- dent sp aimers. TABLE II UPSTRS.AM MIGRANI'S - S~RING ~ 6-7111 8-9t" 10-11½11 12-13½11 Size 18 Not 14-15½ 16-17½ ~ ~ Total 13 122 333 . 632 201 36 4 2 1,343 0 0 _Q -0 -l 31 632 201 36 3 1,374 11 Resident Rainbow Spawners Uarch Plant Total 1, 146 337 4 �. . -5The peak of the upstream migration, as indicated by Table III, occurred during the weelc of April 24 - 30 v,ith 514 rainbows trapped. The peak day was April 25 vdth 163 fishc Ice on the lake started to break on the 22nd of April and was completely gone by the 25th. T.ABLE III DISTRIBUTION BY WEEK OF SPRING MIGRATION Week Number Rainbows Week Mumber Rainbows April 24-30 514 May 29-June 4 18 May - 1-7 318 June 4-ll 3 May - 8-14 334 June 12-18 0 Hay - 15-21 99 June 19-25 14 May - 22-29 74 Total - - - - - - - - - - - - - - - - - - - - - - 1,374 Five hundred and fifty-nine resident spawners were logged back through the trap. Four of the March plant were recovered giving a total of 563 fish recovered heading d01·mstream. _Research personnel checked 266 trap-tagged rainbows caught by fishermen, and broken dovm in size classes as follo1·;s: 6-7½11 , O; 8-9½", 13; 10-11½", 66, 12-13½", 109; 14-15½11 , 32; 16-17½", 3;. 18" and above., l; Size not recorded, 42. ~~ additional 144 were checked at the gate register giving a total of 410 trap-tagged fish caught by fishermeno One hundred and eight of the 266 checked by research personnel and 72 of the 144 gate checked were not logged through the downstream trap. This represents a total of 180 tagged spawners that were caught but not logged dovm through the trap. �This 180 is forty-four percent of the total trap-tagged fish caught by f'isherr.ien. Following this, fifty-six percent of the trap-tagged fish caught were logged through the dovmstream trapo Using the follo-:ring proportion, it is estimated that a minimum of 998 resident spawners returned to the lake. Number Resident Spavmers trapped down = (559) Percent Resident Spavmers Logged ancl -cuught by fis:1ernen (56) Total number Resident Spar.ners trapped dovm (x) Total Percent Resident Sparmers logged and caught by fishermen (100) This leaves approximately 376 fish unaccou.'lted for or 27 .4 percent of' of the total resident spar.ming rm1. This in itself represents the pro- bable spawning mortality of the resident rainbows, excluding the percentage of sp mmers that rer.iained upstream. The term 11 spa·r.ning mortality" is designated to include both the mortality actually attributed to spa,ming and ,·:hatever predation or physical harm is sustained by the fish while in the stream. Trapping operations were initiated on the fall spa~rners late in August. A few stragr;lers came upstream in July and early August but the main run came during the mont:1 of September. TABLE IV DISTRIBUTION BY WEEK OF FALL UIGP..ATION r.reek No. Brook June 26July 2,1949 July 3-July 9 Aucust 7-13 Aucust 14-20 AUGU,St 21-27 August 28-Sept.J September 4-10 1 1 12 0 0 l 6 TOT.1'1., - -- - - Week September 11-17 September 18-24 September 25-0ct. 1 October 2-8 October 9-15 October 16-22 October 23-29 183 No. Brook 24 3 59 58 0 16 0 �- 7 " ~ The above table sho,75 the distribution of the fall brook spa,,mers. It was thought advisable to remove the few· that were present to alleviate any difficulty uith the rainbow studyo They ,vere trapped and transplanted to state--owned Bellu:i.re Lake (Hedfeather group). During the entire trapping operation., thirty-four fish were found dead on the weir. Ten others were definitely attributed to Great Blue Heron predation, These fish were found both at the trap and at the screened outlet. c. Gr01·rth Studies During the co .1rse of this seasons' study., 2,0CO five and six inch 1 marked fish uere planted. A total of 142 were checked in creel census. The acco:npanying table presents the number recovered of each plant, and the aver:ige growth recorded. This is at best only a growth indica- tion. Too few samples were taken to ~ive an accurate statistical aver- age. Growth is obviously good, but to what proportions, future studies 1:."ill have to deter:nne. T_i\BLE V GROWTH STUDIES - I.IARIOW IlAIHBOWS llonth liay June July August September October Harch Pla."'lt Average Gro,·rt,h Samples l 1.5u 37 3.9111 35 5 5 2 4.41" 6.00 11 6.00 11 6.50 11 June Plant Average Samples Growth 15 21 12 4 Au~st Plant Average Samples Growth 2.35 11 2.co 11 J.LJ." 4.00" 4 1 1.611 J.00 11 �- 8 .. A comparison can be drawn between the growth on the marked fish and the information in Table VI in regards to the legal tagged rainbows. TABLE VI GRCY..JTH STUDIES - TAGGED RAINBOVfS August Plant Tr!E Tagged June Plant March Plant Average Average Average Average Samples Growth Samples Gro~·rth Scµnples Growth Sas>les Growth Month 25 o.411 0.3 11 112 0.3n 46 0.1 11 72 0.611 2.9 11 13 0.8 11 13 0.1 11 16 0.8 11 10 2.1 11 12 1.2 11 7 o.2" 30 0.6 11 2 3-511 4 1.3 11 1 1.011 11 0.5" llay 29 1.411 J:une 67 2.2 11 99 July• 15 2.8 11 August 7 September October Growth is obviously much better in the five and six-inch plants than in the legal-tagged rainbows, Insufficient measurements, and the absence of a complete creel check of the fish removed from the lake, reduced the value of these figures to a gro,·rth indication only. The average growth in both tables is an accwm.uation for the months indicated. D. Creel Census Fisherman checks were conducted on Parvin Lake by research personnel only. Regular warden report forms were used in this operation. The fol- lowing breakdom by species, origin of fish, and method of checking is presented. �-9TABLE VII 1949 CATCH HEI'URNS Untagged Untagged Untagged Stocked Brown Rainbows Tag Rainbows Rainbows Brook Trap Tag Total Research Personnel Checks 266 3.31 1.,$:78 81 19 2,275 Gate Register Checks 144 269 3.,265 0 0 3,678 Total 410 600 4.,843 Bl 19 5.,953 - Research personnel checks for the seaso::i., broken down by species and size classes., are contained below in Table VIII. TABLE VIII 1949 DEPARTilENTAL CHECKS 18 11 Size Size And No:b Classes 6-7½" 8-9½" 10-11½" 12-13'¼11 14-15½11 16-17½" Above Recorded Total Tagged Rainbows 1 68 230 199 33 3 1 62 591 ·Untagged Rainbows 158 568 407 320 103 20 2 0 1.,578 Brook 5 15 34 24 3 0 0 0 81 Brovm 0 - 2 --1i ---1 675 0 62 142 23 3 19 653 -553 Total 164 10 0 0 2.,275 During the creel census., fishermen checked by research personnel vrere advised not to list fish personally C3ec!ced by departmental personnel on the gate register. The 5.,953 fish., representing both the creel checks and the register., is thought to be the minimum number of fish caught out of the lake. Possibly many fishermen., who ,·,ere not checked individually, subsequently ignored the gate register. �- 10 A total of 1.,941 fishermen, fis!rl.ng 8.,426 hours, and catching 2.,275 fish were actually checked. .269. This ~ives a seasonal Catch Per lian Hour ot Evaluation of gate records resulted in 2,627 fishermen, fishing 9.,654 hours, and catching 3,678 fish., giving a Catch i:sr 1.ia."1 Hour of .380. Unsuccessful fishermen reluctant to register might explain in part the difference in the Catch Per lian Hour. To alleviate this and other problems., a permanent checl<: station will be established next season to obtain a complete check of all fishermen entering the lake. In this way, much valuable information pertaining to growth and tag returns can be obtained, a comparison of census methods can be made., and the individual merits and deficits of each determined. Honthly fishing pressures and the respective catch returns are refleeted in t!1e follcming table with a comparison between personnel checks and the register tally. Ti\BLE IX iJ0NTHLY CREEL CEIJSUS DATA Month Personnel Checks Re~ister Checks Fish Fish Caught Samples. Hours CPllli Caught Samnles Hours CPillI - May 363 193 1.,127 .322 1,232 605 2.,054 -599 June 5o6 511 2.,318 .218 827 656 2.,041 .405 July 412 580 2.,264 .181 455 683 2.,250 .202 Aug.1st 220 271 1,141 .192 331 368 1.,.517 .218 September 432 242 1.,107 o.390 571 247 1,411 .404 October 242 144 469 .515 262 68 .381 .687 Seasonal 2.,27$ 1.,941 8,426 .269 3.,678 2.,627 9.,654 .380 �- ll - Records from previous years., show a steady decline in Catch Per Man Hour accompanied by a general decrease in average length of the fish caught. TABLE X CATCH PER MAN HOUR - YEARLY COMPARISON Samples Average Length 1943 -.16 2,205 13 11 1944 .97 609 1311 1945 1.12 448 11" CPMH ~ 1946 CLOSED FISHING TO 1947 .71 2,320 13.7" 1948 .28 996 10. 7" 1949 .27 1.,941 10.4 Rainbow trout are predominantly caught., with brook and brawn of secondary importance. It is planned, through trapping and removing both the brook and brovm, to further convert the lake to essentially a rainbow habitat. The high initial catch per man hour is attributed to the fact that up to 1943., Parvin Lake was maintained as a spawning station and closed to public fishing. Exclucing fish planted during the spawning operations, no hatchery reared fish were stocked in the lake until. this year. Up to 1949, fis:!ling seasons at Parvin Lake 1·rere short and well publicized. sequently a high fishing pressure was maintained at the lake. Con- This is reflected directly by the gradual decrease in average length of the fish caught. �- 12 E. Shocking Lone Pine creek., the inlet stream to Parvin Lake., was shocked on July 27, and September 7-11., 19b9 from the trap upstream for approximately two and a half miles. It was necessary to skip several sections of the stre8.&~ due to dense streambank vegetation. Marked fish from the August 15 plant of two-inch fingerlincs v,ere found scattered throughout the lower sections shocked. The stream bed changed from a boulder., gravel and rubble bottom in the lower sections near the trap to o:ie predominai"ltly of sand and mud about one half mile above the trap. Rainbovrs of all sizes predor.1inated at first., with broo!~ increasing in numbers as shocking progressed up the stream. All fish recovered seven inches or over in length were tagged, the smaller ones fin-clipped. Clipping of two-inch rainbows began approxi- mately 3,800 feet above the trap w~ere evidence oi' hatcherJ-reared marked fingerlings ceased. Five hundred and seventy-seven brooks 4 - 6½11 were fin-clipped and one hundred and forty seven-inch and over, tagged. A total of three hundred and eight rainbows were .fin-clipped, 138 -1½ - 211 , 78 - 3-5 11 , and 42 - 6-6½11 • Twenty-six rainbows, 7" and over, were tagged. A total of 16 tagged rainbow spavr-1ers were recovered a."'ld ret"..l!'ned to the stream. !fo atte~t was made to count all small fish shocked that were not marked. A count of dead fish in the stream was nw.de to determine mortality from shocking. Fourteen mbced ra:.nbow and brook vrere fotL,d plus two tagged rainbows. Shocking effectiveness varied ~ from approximately seventy per- cent to spot-checking in accessible holes further up the stream. stream growth prevented effective census of the entire stream. Rank �- 13 The stream was fyrther spot checked on November 2, 1949. Fish were recovered in proportions comparable to the earlier censusing. F. Environmental Studies Ecological studies were initiated at the start of the projecto Plankton checks, both surface and vertical distribution, ,~rare made weekly. Zooplankton were counted and recorded. Phytozoo combined were pre- cipitated '\'lith methyl alcohol and recorded by volume. Classification ,·ras conducted as far as possible. By using an Eclonan Dredge, bottom samples ,·rere taken at infrequent intervals. Direct ·counts of the entire samples were made. A Foxborough resistar-ce thermometer was used weekljr in a thorough study of temperature stratification within the lake. fzy"drogen ion concentration readings 1'rere conducted weekly -rri.th a coloro.netric pH indicator. A Secchi disc was used in combination with the plankton c~1ecl:s to !n.easure degree of turbidity. Ocular estimation of weed and algae abundance ,·ras continued for part of the seasono All checks were conducted in as nearly an ider..tica.l manner as possible for comparative purposeso Detailed reports on the above studies ,·tlll be oraitted from this paper. A later treatise v.ill cover the ecological information in detail ,-:hen yearly conr~arison data is obtainable. A general resu.'lle of the materir1:.'. is herewith presented: 1. Plankton Cladocera (Daohnia ~o) a.--id copepods predominated in the zooplank- ton samples. Quantities remained rather static during the spring and �- 14 early summer with a fiuctuation upward towards the fall, then a general tapering off in the vrinter months. June to August. Copepods were in the majority from Counts from September through December found Cladocera in much larger quantities, and comprising the majority of the plankton. Volvox and rotifers 1·tere in minor quantities during the summer, becoming numerous in the fall and early 1·r.i.nter. Volumetric r.1easurements reached peaks in July, Aua,.ist, and September, with readings of 1$.0, 10.0, and 20.0 cubic centimeters of phyto-zooplankton contained in 10 u. S. gallons of surface lake water. These readings were made by straining ten gallons of surface water through a regular plankton net (No. 20 bolting cloth). Vertical distribution of plan!<ton was obtained by using a 1,150 milliliter water sampler at various depths and straining-the contents through the same plankton net. 2. Bottom Samples Asellus and Chiror.omidae lcrvae made up the greatest amount of foo~ found, with various snails and Damsel fly larvae in smaller amounts. On a percentage basis in the samples taken, Asellus made up sixty-three percent, Chi.ronomidae larvae sixteen percent, 0ligochaeta sixteen percent, vdth the ramaining five pe~cent composed of miscellaneous snails and other insect larvae. 3. Temperatures Stream and la!te temperatures are represented on the follo,·dng table showing the ma;:imum., minimum, and mean readings: �- 15 TABLE XI TEI.IPERATUHE RJJIDE - Jtn:E 14 to DECE:iJBER 1., 1949 DEGRE:SS FAHRENHEIT Surface 51 30' Eottom Inlet Stream 55"5 55.,5 55.5 55.5 59.0 36o0 36.0 36.0 36.0 33.0 45o9 45t-7 45.4 45.o 48.l lOf 15 1 20 1 25 I 55.5 35.o Maximum 69"0 60.0 57.2 i.Iinimum 35a0 35oO J.5o0 Mean 49o0 48.7 47.7 46o7 4. Hydrogen ion concentration pH readings were taken in the lake from April 26 to Decere.ber 1., 1949 and in the stream from August 29 to Dece~nbe:;.-- 1., 1949. from 6.8 to 9.0 ·rdth a mode of 1.5. The lake ranged Tr..e inlet stream ranged from 7.0 to 7.5 with a mode also of 7 •.5. 5. ";:ecd ar..d algae ~buJ1dance. Aquatic vegetation present consists primc.rily of the vtater-weed Anacharis canc1.densis and a blue-green al~ae :nabaena §E2• An algal bloom appeared in July., i.1:creasing and decree.sing in comparison with the volumetric pla."'ll~ton measurements~ 11 aterr:eed was in {;reat abundance ciuring the summer and early fall to depths of 4 - 6 !'eet. were quite 1)rE.valent in tl:e leev;ard coves o~ the lake~ Algal scums In these areas, vrhere the algae was quits c:,ncentrated, al:unc.ance cf the waterr:eed decreased. n ~.-:ith a general 101::ering of both lake and stream temperatures, aquatic vegetation decreased i~ abundan~eo l"lith Visible depth measurements., a standard Secc.hi disc, gradually increased from t-t·ro and a half feet during the peak of the algal bloom, to ten feet in the late fall and early winter. Possibly, the abundant watel"\veed has a protective value for small fish. This is purely conjecture. mined in future studies. The validityuill have to be deter- �- 16 G. Food Habits Study. A total of 418 stomachs were analyzed as sho,m in the folloYdng table: TABLE XII STOMACH SAI:1PLES 1949 Origin Rainbow Brook Brown Lake 334 17 6 Heir 27 28 2 Spoiled 4 0 0 Of the 334 rainbow- stomachs taken from the lake ::,roper, thirtyfour vrere empty upon exmnination. '!'he three hundred remaining stom- achs 1·vere analyzed as to (1) pe~centar;e of total stomach content (by volune), (2) nu.merical frequency of occurrance, and (3) ,ercentage of occurrance of the major food items and groups by size classes of fish for each month of the study. Asellus made up 40.30 percent of the total stomach contents, occurring in 181 separate sa"lples~ Hidge larvae made up an additional 14. 07 percent. occurring in 201 sto:;nachs. Bait made up a total of 1L62 percent occurring in only 42 stomachs. The remaining 34.0l percent (by volume) is composed of approximately twenty other items of varying importance. Table XIII illustrates a total breakdown of the 300 stomachs by major food groups, lu.'llping all size classes. l.Ialacostraca, composed chiefly of Asellus, !PJallella, and Cambarus, ~.ade up more th~ one-half the total stomach contents~ Aquatic insect larvae and bait material \7ere ne:;:t in quantity nith �- 17 the remaining groups in decreasing amounts. Liscellaneous foods include sorr.e water mites, aquatic spiders, and water st:::-iders. Studies made thus far indicate that Asel lus and Chironomid larvae are the principal diet items of tl1e rainbon in Parvin Lake. Unicentified fish remains made up 1.52 Percent of the stomach contents; appearing in twelve stomachs. r emains identified as trout. Only one stomach contained f~.sn Pi mphales snp. (Fathead r.rinnow) were con- tainec. in ty;elve stomachs c onsistinr; oi' 2 .63 percent of the total stomach contents. Judging fro~ t~e limited information cbtained, cannibalism does not appear to be of any particular i::1portance in Parvin Lake. Tl.Pill XIII PERCI:NT./1.GE (BY VOLUi.lE) AND OCCURR.1'.NCE OF EAJOR FOOD GROUPS Ento~fosPlants traca major Food Groups Perc enta[ e of Total stomach content, by volu.T!le Lialacostraca Aquat:.c Aquatic Terres - Verte- Gasbrate tratrial L-lsect Inset larvae Adults Insects .lmir.:.als poda Bait 4.16 4. 09 59.45 14.93 0.08 1. 05 4. 15 o.47 11.62 Nume::.·ical occurrance 61 95 234 210 13 22 29 32 42 Percent of Occurrance 20.3 31.7 78.o 70. 0 4. 3 7. 3 9.7 10 e7 l!.;..O VII. S:.JlII.iARY 1. A total of 10, 000 hro-inch, l , Soo five-inch, 6, 000 legal unt agged, and 1, 910 tagged legal r ainboi::s were stocl:ed in Parvin Lake during 1949. �- 18 2. Excluding the October plant of 500 tagged legal rainbows, a minimwn of 42o5 percent of the tagged rainbows were recovered by fishermen in the 1949 fishing season. 3. Trapping of spring migrants netted 1.,343 resident rainbow spavmers and 31 rainbons of the liarch first plant. 4. Five hundred and fifty-nine resident spavmers and four of the Harch first pla.."'lt were logged back through the trap. 5. Abnormally high ,vater during the early summer prevented effective and complete trapping of returning rainbow spawners. 6. Proportional computation estimated that a total of 998 resident spa~mers returned to the lake. 7. The 11 spawning mortality" of the resident spawners was approximately twenty-ni..11e percent. 8. A total of 183 brook trout were trapped and transplanted to Bellaire Lake. 9. Trapping fatalities accounted for thirty-four rainbows., ,nth an additional ten attributed to Great Blue Heron predation. 10. Insufficient measurements and the absence of a complete creel check, reduced gro,:th studies to an indicative value only. ll. A total of 1,941 fishermen., fishing 8.,426 hours, caught 2,275 fish averaging 10.411 in length., according to research personnel checks. 12. Catch Per 1Ian Hour computed from Research personnel checks was • 269. 13. An electrical shocker ,vas used in censusing approximately t,·ro and a half miles of the inlet stream., Lone Pine Creek. A total of 717 brooks, 308 rainbows., and 26 tagged rainbow spavmers were recovered, r.iarked or tagged., and returned to the stream. �- 19 - 14. Cladocera (::Jaohnia spp:,)., copepods, Asellus., and Chironomid larvae make up the majority of food present in the lakeo ::!.5. Yfaterweed Anacharis canadensis., and a blue-green algae }nabaena spp. are the two pr:..nciple aquatic plants. 16. Analysis of 300 rainbow stomachs containing food., resulted in Asellus, Cambarus., and Chironomid larvae making up more than seventy percent of the total stomach contents., by volume. �\ot ~ f'1'' ~ .~ ~ ~ ~( ( Ill~,., .i1r ;[ls-_ m2. 3.. :21 ~r i ., -ai~ f Eh atJI - . ·~ t f ' • 0 '1 i ,~" f ii i{i PI rll!;!1_· I·:__ - 0 frf l 'Ii I • I l f_l,!J ,,, ' i . ~ 1 i 1 ,,,, 0 · iff r. -- ........... (5..tfl &1 ,~ram <ro(!:lt.-tt !i!trl.f ct- <rf-Q H t Ia Io ~ .. i., I N1 - liitd ief~~ l , hh• gtt" h ~ I ~ ~ -h'di fffi.i-.1 .. rt !~,1~ ~, i 11~: f ii git fo::1g •• £, ;":" a: ..iii .. ~ t.i.._af~ ui I • ...... fl> "'" .. 1 "' ii :t ~ t I~ If.rs ,t.. . . ~ n~ - 11:t J! :· •°''~-; _•ri_ ~o-Actlo '""',1 ~ii ~I jlilli' iii I j:!. :>"'s:t t' ... ~ ia ,tsa, a5' h ~ tt!l s-5-.t~ !! a. . f'!u- "S! !ii: !i fif!!ti glit ,.,t: ,,. · ~--f $ ®1°m- d f!.I• .e,t; ltll.t'lU h-,·g ~ fl il~ti ~~~ ,~ f~ (8 !~f~ if• "'i'!Ji i~- - fd;!, i~ ,, ., :1! ! ,,,r ,~ lj!!fj; s,,; 1~,i,,, 1111ir, , i,, C,- ( ( ~ ( ( • ,_. l ,·"i �=~ =~':1:UC~=i:: ~:= ~ 1':l.sh or 1,710 pounds • .At:iout BOO fi&!:\ -,a ;1.omt. men tu bocams mudV and they were not taken out fUt e.uour)lo 60 D ~ tb0 ops-muon appxo1dffla•~ 1-:tl(la p:>tt.m!e of cal1J - . re~ ~ the ~-Go Scmm ot the ftsh_ \1181gherl as mutit\ as tM• ~ ea~ Rowner, tbe7 ~ - - Gout ~ ~ ~ . Mr.Q ntchen ~ ·tho ~ w a batchtn7 tor use ,m ~ toad. VIII. Discuniom lo fb.e· em,, taken~ ~ pod~- all ~ £1Qh and m ~ . ,a1J) lmN f•ud to b.0 ~ It_ is avian\ tha.t tlffi· ove:_- ~ lat4an or pme tioh definite17 e o ~ the Oar» ~ 2o The game tiuh populat.4on consietf.ld ot the species listed lae1aw' along w1th am est!mate of ~ psrceatage ot theil- ~ • I= a::J Baas (L&o) ~ 10j£ Bullheads ~- "'--"'. There \19n all. sums of all species present inoltidulg ~ JaUS JOU!tt& fisho Some ot the bass we1ped up to five am ·a lmlt pGllldso 3o lt iG believed that sinaa thG caq,· haw boe?1 removed that the game f'1sb w1l1 tum to ~ upon eadt c>thar. amt th:t.a_ factor plus the t1sh1tg pre~ on the lake shoulu e•ntimll.7 lead to a natul'81 balance ot the fish_ popul&Uono llo Becommamia\1.on1 1o ?lo mere fish ~ be stod.ced in tMs lake 'Umdl. ttie ~ p,p- ulation las been paat:ly ~ o :to. lame tiJPC of-~tiG>n-ehould be· utmd to J)l'OV1de mr>IO food forthe ~ t1ah popnlatd.on~ • �.. I. 5.'itlo11 A Suppl(n'OOnt to the Jnci«Jon Lake Sur\l8y (Sopt. 201 1948) n. H. H s, Supt. or Research mid Dwtribution III. Supcrvisorr IV. Iuvcotiguwr: T. V. Intr.xlucticni o Jzynch, •1.dh Teelln1c1r..,n e.nd f<ich Club 1o procsing fer Lletion on the d o ~ or th fidhcr.7 1'CSOUre8!) of Jllcl:tlon • ar thiD ~ r an . to px~:mt an a"Oc.J.y.::-5.8 or tho 1'cc.tort.1 t11icb mt ,e .i. ren into co • tion bcforo n nm~a::n:nt, pl.On c:1n be Pl1t ho Fcrt 1oll,m O m;o 01xu.ctioii. ! ;) Curp, lH.nw·:rrclt, D\G.lho~ctG and thTIJi· apac.ti.tr.\' of J~m?\-..~ s.ro ..,, • • in Jscl:oon I.tum. i'be cal"i?t rlrQ"Jr!I'Oh cud 1.rul.U "' w'.w.l bo the o~· !'iah comidorod mm. 2., t nro no m:till aito can, to fcnu:d 1n tho lnl:e1 x:i.ont of th oe fich run to ltlrgcr &'i.\'CS. ~ ·Ph(Jtl:'b::lltlM bclrl.n:1 thin factor, in Di.apl.y that tbs i·po;mlntion 'l£ tho l'irtJPer<U tlllr :teed. upon tho d ~ of tho cat-p to S\I.Ch n xtant thot only tho la1li survive. 3. It 1 mtuntl. tor both tlw rlll!.tPCrch attl the bullh to ovor- elven and core otuntod i'rcr.l JAcl: o.r .rood. Thie cans at Jacl."SOn o fboreforo, Jltit oril.y ~ too ~ om-p, but there ie nlao o. go rcu. ovc-xwpopwntion or th .._,.. otock th dition e ani bullhco.do. ~is or tho Factonu VII o l o llccnowl of of tho corp ~pnl.at.1.on td.ght lead to 'l.Clcl; of food i'or tho ot:h r two fJl)Cd,eo nrxl th1e m1d'1t t mtl.t 1n t'urthar aturrt1n,r; o! t.booo f'ioh . 'ro It:d tl10 r.f.nmx:rch nrd b'..ulhea.d p:>pulation td.gltli all!m th carp to 1rx:reauc. Thererom, om olut'i.ol1 mlf;ht bo to reduc tlle rim or nil throo upcc.ieu. !l.'h n ::::.r.:i1::cr o1' ~ of redue:tna a fitt.'i popu:L-itionj r:ru.dh ru:; seining, t.n;,p1113j :.n:! tlir31J.Ch tho uoo of p:>iao o lt(r;;ov0r, fl'D':l ovldonco acc~tcd by ~ v Fiohccy ti •• includi:ng our cr.:m, it brm dotorr:1 d thr.t um mt.ho v.ro ~ to::ip:,mry ?X:l6 t, do mt prov!. for por:c 2~ rd; 1tt1 ... ..,............,...,,. :t: o· r ,. Of fin!. r'!/ "'nt DUclt J O "' l;;Bl oltorction, n-J.tcr lovcl nipulntion, etc. Ham:nrer, thcso hodu oam»t bo utilu;cd on n la.!..-o usod for in·.tcational purp:> ... . 3. Removal o:t· undoDired fi3ho.e iB orton oxpoasive as , ll cm f'utilo in ny caEGl3 . H , vcr an old idrul. bas been rocen~ revlwd to prov.I.de a othod which m.ght a.id in th9 control or at nted and oboono~ fish populations . This idea consists of introducint; !'act grow-i predator fioh auch aa the mlleycd Pike• 1ite &.8s Md C!l.onool catfish. �4~ li:.econt infor:nation co~...rili?lg the JlU.f r or tJ. u prcd!ltor r~.~ ~Cf£.'!! -t~ aal'>.18. con.:.rol o r tho inxl pc<;iC\s ;.rtli~ta tlwt tho in :tor f ·h populutiion ~ t ~ up 25 to· 3() pon-:ent. ot 1 tian of u E~~ lvlroo« tal \: :(!hfi t tho oM.ro :f.'i.Gn i'b.31.'a.4\l. , th old tocld.r~ LDth?d or ....ttirr . fo1 :fi0h re a ! r ri.cll the. en iOOt bo wed.. ~ to 100 1'.lngorli:o,co l)Cl: aurte.co nc.ro :Jh~ul 1 be atocl:ed ..f thore w Ii or n conti-ol £{...oho '111" t • li ' 001" :xi . • _,....,#<,.,...., .. ~&.'.J.': !' 7.inl.'I • n e.xpaa;;;ii,.~. It. >ro • nt -c;;:n be 60 nmf!JC • of • r.i w.Oth '001 ~w~ ~ -.f l M ' • ~~tictil r:, rc:(!W:.rc ire bofor. t :ifito p:rnct1co on -:.it nm • ry rec~gni.1le.c. that tile ~nviro. ~ con ti.ti.om present 1n • of our tmru ,.qiter ...... are mt-c"h t.11:it ~ ror,aee fich o.nd rough ft:)."1 fL'"ld all the nccc,.m1ary req dr(...-,ent--s richt ror li!'o. l...,.,,--.... tore unl su 0011 rnblloh ~ dtr.un· :at pr tor fioll tr., ~1rlil'ol th fomgo .4ad rough :fish_, ~ m.ll alTia "':VC o.n ovt;N_ pulation or . ch i"wh. E 'fort.fl such e.c od.ning, otc. cOttld co on fo1wer rlih only to..-nporery 8UCC 8 • :.t uzt ,-=-., VIII. Ree , ncht:iom l.. It in :roco ~ tt1nt, Jaok&on lal."'O bn cchcdulcd one • !.'irvt la.~.. for &n irt.cnsivo owcl:1.n[: prograo or o o!' tl t.brao c cio1l of !'u..;t s;n.ming Jlr(; 'i:itor fl•·l1e1.1. �I. 'l'itle: Investigation of Rucker Lake, Fort .Logan, Colorado, regarding dead crappies. II . Date, Jum 17, 1949 III. Supervisor~ IV. Investigator: V. Introduction, n. n. Hess, Supt. Research and Distribution fl. R. Seaman, Fish Technician IV An investiEation of tho cause of dead crappies in Rucker Lake, Fort Logan, llilitary Reservation, was ~de on June 17, 1949 upon the request of Ur. Overton, Captain of the Fort Logan Fire Depart~ent. VI • Sum::iary: 1. Approximately 100 four to five inch crappies r.erc t:een dead and dying in the lake . 2 .. The follomne water test a.. Te,--riperat.ure - results were obtained: 700 J." . b. pH . c. Dissolved Oxygen - 8 . 6 parts per million 8.5 3 . The fish affected all seemed to be in the same age and size group. h. Exru:lina.tion of the dead fish showed fusion and breakd01rn of the gill filaments. Microscopic examination showed an extrece infestation of parnsitic copepods mich is undoubtedly tho cause of death . These parasites arc small crustaceae . They rasp a hole in the gill tissue and suck large quantities of blood. The nechanical injury also results in a secondary fungus infection which can contribute .:aterially tc the losses . 5. Age detomina.tions by scale readings showed the dead fish to be four years old. The fish are quite stunted for their age and indicate that an overpopulation of crappies exists in the lake. vn. Reco:-r..e -idatior.s: Very little can be done to control an epidemic of this type in n natural water. The cost oi' ir.Ddi.cation would be quite prohibitive . It is seldom that a complete mortality will occur from a r..atural cauae such as this. Due to the stunted con::iition or the crappies, it is possible that this infestation can be beooficial by reducing the numbers aoo promoti?Jg better gro,:th in those re::urlning. After the epidemic has run 1 ts course a population check should be made on the lake to detero.ine what restocking steps should be i:-.a.de if necess- ary. �,... .. July l, 1949 llo Dates IIIo Supervisors IV o Investigators& T. U. Lynch, Teehnieian IV Vo Introduction~ Ro Ho Hess, Sui:,t, Research ani Distribution Robert Evans, Technician II The Pueblo Gme and F:tsh Club requested that Lake :Minnequa be st.ocked w·ith game fish., The Colorado Fuel and Iron Corporation owns the Lalro, thoro£o:ro permicslon had to be obtained from them to open the lake to public fishing. VIo Summary, lo Lake Uinnequa ie located on the aouthweatem limits of Pueblo, The area or the lake is 186 acres, ,rith a mood.mum depth of 16.,3 feet and an average depth of 9 f'eet,. Lake W.nnequa ie part of a three la.!..:e reeiervo:l.r syutem, the water from these reservoirs is used in operations a.t the c. F. & I. millo Mirmequa water is used only in an emergency, therefore there is little level nuc-tue.tion.. The other tv,o reservoirs are much larger and are located tour mil.C!s south or Lake !limequa, they supply the mrmal water volume used by the mill. Seep nter from these larger reserwire i.8 carriecl by ditch to Mirmequa I.aka o Whenewr the lake need• more water to br1.ng up the level, a direct water run ia made to Uirmequa from the other t-iro reservoirs o Thia direct run ia made t-.lu-ough a pipe trom the bot-tom of one of the lakes to the ditch leading to Minnoqua. The dia.':leter ot this pipe is twnty-eight inches, it is never opened 100re than 3/10 of the wayo The outlet pipe of Uinnequa. hke is twenty-six inches in diameter arrl is screened to pr3vent clogging o Overnot, water passes to the D8'\'\"8ro Colorado. ·2. Wa.ter pH. was 8-,, alkaline hardness fluctuates between 69oS grains per gallon in the oummer to 17. grains per gallon during the wintE!l' o Sulpiate content was 435 p.p.m. 3. Aquatic vegetation covers the lake bottom from the shore line to a depth of nim feet. Vegetation consists or potomogeton sp., algae is e.bundant o Shore line vegetation includes Cyperus sp o, Gramineae sp. and Typha. Over one-hall' of the shorelim contains abundant. vegetationo 4. The species of fish rourxi a.t the lake 1ncludeds A. Cyprinidae (Minnow) fmrllf lo Carp (Cyprimis caTpio) 2o Spotted chub (r,rimyatox Spo) 3o Reel.fin ehim r (Notropie ap o) 4.. Common shimr (Notropis sp.) 5o Swallowtail shiner (Notropis spo) 60 Fathead minnaw (Pimephaleo promelas) �' Bo C1;>r.l.nodonttdae (!lillifish) family, Pl:lncterus kansa.e Co Ameiuridae (Ca.tf.ish) family, Ameiurus mela& ~o There are very few catfish 1,resent in the lake, the carp are not numerous. The smaller. species of fish are overabumant. 6. The water tempei-ature averaged• Noon until ~ 100 P.u. 6/J.r;o Fe 67.']) F. Surface•••••••• 5 feet •••·•••• 10 feet •••••••• l4 feet •••••••• (bottom) 6h.5° F. 63.50 F. ,Ssoo P.l!. until lla:J) P.M. Surface •••••••o 68.,o F. 5 feet 10 feet 14 feet •••••••• o••••••• . . . •. ••• (bottom) 68.S-O F. 67000 Fo 64.5<> F. The general we.ther conditi0?1.s were 85° F. between noon an:l S100 P oU ~, and a drop to &;,O F. by 8s)) P .Mo 7. Food is not overly abund~nt., such aquatic organisms u liated below 11ere observed to be presents Diatoms: Pinnlarta, Caloneis, Stauronei:>, Fragilariao Dinollagelat,e spo Protozoan sp. Hydrazoa sp. Cladocera sp. Ostracoda sp o Aquatic Insects: Odonata, Her:d.ptera., Chirommidae, and Tabe.nidae. VII. Discussions 1. There are t,ro ways by which fish might gain entrance to Lake llinnequa_. a. Dy the direct mter run vmere the wlocity and pressure 1VOuld probably be ter.rifie, ho·m.ver a few fish might make it and a few is all that is needed. ho By the Cleaning Station 1"8ste water, water to be uaed by the mill is pas$ed f'rom the reser~oil'S through 40 mesh per irmh screen to rElllOve organic matter and debri. Some of' thia water is wasted and allowed to go into the seep ditch to Minnequ~o 2. It is evi.ient even with theme hazs1"dl!, fish have IKde it to Minnequa Lake.. It is also evldent that it 110uld be next to impose1ibla to keep them out of the lake. There is r.D local koowledge that Minnequ.a ,ms stocked with the present fish population by any other means .. �-33. The water nt I.31<:G? I.!ir.nequa is clear and there :ts an abundnnce or aquatic vegetation on the lake bottom, these two points plus the fact that very few fish \\.iere ta!cen in gill oots ia:licates that the carp population in the lake is small. The over-aburdance or small minnows even ~ n deep -.,aters ir1dicates a definite lack of predator tisho VIII. Recomendationa lo Before arry stocking of fish in the lake is made, some attempt ot reducing the amount of aquatic vegetation should be made o Possible '196 of So<liU11l .A::senite or fertilisation mieht help. 2o It is believed that the lake could be stocked wit h a predat or species, the p;,-eeent !ieh population can be used aa the forage i'isho �IQ Titlaa The S'urv'ey of the Hblly Gravel Pit Ila Dnto1 August 221 19h9 IIIo Inveatigator1 IVo Introdttotiom To Mo IJncbJ> Fish Techtd,o1an IV tifro Ro L AndNwe, Viml MSl'lagei-,, raq_ussted tM. a 8Ul'VeJ' be made of the gre.vol pit on(ij • a half miles weat of llol.ly, Colorado with regard to tho p08Sible ~ o£ a mm- fiahing aN&o fu Liorl's Club at Holly is vary much int8rested in obta:lmng eom.e tyve ot fiab!ng tor their vieinityl;> Vo ~ The gr&V01 pit ie lccated 011 tho land CM!ed by Llro Ed Jeantmon, of laatador, Tex.aso 'fhe pit, riao a water surface area of two aeNa .w-lth an avv1raae depth of 2o9 fe&to There is one deep area of less t.btln onehalt aere~ the csntar of this GNla being ~ - f i v e fee\ deep. A ton fcot, strip around tho pit along thm btmk averages tllNe feft doepo A large ar0a in the ecntar of the pit is not more than eight inehes dsepo 'fllsc'G is no surface inlet, the water souree is from ground seepageo The only· outlet. is through a P'\l'JlP'l., which is used to plmtp tbe water out ot tna.,\~ to ·S'-Jpply an adjacent term with irrigation water. 'llheD this pump-- br 1.n operation, it can lower the water level in tha deepest part of the pit soma t\'.'IOnty.-tm., and a half teeth, This leaves a two and n haJ.t foot level in the dQep area aflf1 no water in the rest gf tlte pito ?1ho farm 1G also awned by- ~o Jamemm., they are both up for aalo, but he w1il not sell tho pit. separateo The present t1sh population of the pit consists of Green Sunfish1 bullheads am carpo These fish vo uLd have t0 be N~d if fey or fingerling fish ~ere stocked 1D the pito Before q- at.tempt to stock this pit oan be made» the e!'ull.l.Gw area shc>uld ba ~ened. GO that the average dept,h vo uld be at lerast five feet. If Mr. JO.lmaon of lloll76 Colorado, vmo operates tho aand and gravel unit at the pit \U1a pl~td.ng on continuing operations, the pit would bo GVentually deepened and el'llargedo llomffer there is little da.iuand for the send and gruwl oroand Holly, and !iro Jolm pl.ans to lsave 000!10 VI9 ~ation1 TllQ I ~ Gravel Pit nould be a suitable place to stock either 'lraut or '\farm water fiah provided thata lo 'lho shallow area be deepened so that too average depth of this arsa would be at least five feat deapQ 2o Tbst there End.Gted a written t ~ e th~it the water lwel VIOuld mvor bca loworad enough to endanger the f1sho 3. Uthe stata stooka tllia gravel pit the owner must open it to public fishingQ �-- .. I. Titles F.d.ucatiorol Cor.terences wit.'-1 Three of the ?lation•s I.es.ding Fish Pathologists. n. .Oateo I Septetlber 15 to October 24, 1949 III. Investigator• W. R. Seaman, Fieh Technician IV IV. Introdllctionr Out-of-state tra,,cl wu authorized tor the viaitat.ion of three laboratories nnd. the thologiate in charge tor the purpose ot gaining intomation applicable to Colorado' a fifJheries o The stat.ions "fieited were the U. s. Fish and Wilclllf"e Experiment.al Laboratories at Cortland, New Yorlc am Leet.own, W. Virgiirl.aJ and the Michigan Inatitate tor Fisheries Resoaroh Pathology Laboratory at G?QyliJlt, Uichigan. Put I Cortland Experimental Laboratory - U. S. Fish and WildlU'e Sem.ce, Cortl.arrl, New York. Septsnber 15 to September ~, 1949 was spent in conferences and laboratory work with Dr. A. V. Phillipa of the U. S. Fish am Wildlite . Service am D. R. Brockway of the tlcr~r Torie Comervation Department. The laboratory wol'k at Cortlanc\ is primarily concerned with the mitritional requittments of trout. Excellent first-band information on vit&min and nutrition requirements of all species ot trout, as well u feedi~ methode, was obtairod. Recognition of dietary deticienc7 dieeasee was imluded. Lnborctory uom mu, performed on Qllemia blood counts, parasite identitication, .fat &ntil.ysis, am post-mortem routim. D. R. Brockway contribut9d i¢'ormation on the Sta.ta or NeTr York's reeding and hatche17 management charts. Mr. Brockway' s CUITent inveatigational work is on metabolic by-products or fish arxl the roaulti~ lowred c ~ capacity due to ammonia build-upo Interestin.g points were given on the phase of hia mrk c0!1cerrdng carrying capacity. Soma 190zk was done on diet prepa...?'8.tion and feed1.ng methods. Due to the variance or Col'Jrodo'a diet over other state'e dieta, some discussion was made concer11ing diet supplements. The only apparent lack in Colorado'o d:tet is a biotin (B COlll!>leX vitamin) deficiency which is possible to correct by the addition of Brewer's ,east. A trip was made to r~ew York State's largest hatchery at Rome, New York (40 ton yearly output) • While there, I had a lengthy conversation with Dr. L. c. Wolf, the state fish pathologiat for the New Y.ork Con- servation Department. �- 2 - Part II Ieetown Experiment!i-1 Laboi-atory, u. s. Fish and Wildlife Service, Kearneysville, West Virginia. October .3 to October lh, 1949 was spent. in conferences and laboratory work under the direction of Dr. s. F. Sniesuo, Bacteriologist for the U. S. F:ish and \fildlite Service. Experirrental and practical laboratory work was done on preparation of bacterial culture media, inoculation, and identification of pathological fish bacteri~. Methods and techniques in disease treatment and prophylactic measures were shorm. Use of laboratory equipnent and materials necessary tor bacterial. inve~tigstions 1f88 pointed out when I was unfamiliar with themo In addition to bacteri.al investigationB, considerable intonation was picked up from Mr. Eugene Surber on aquatic vegetation control by use o:r sodium araenite, copper sulphate and 2 - 4 .. D. Interesting diacussion was had with Kro Croswell Henderson on pollution abatement on the Shenamoah River in Virginia o Bacterial culture media ~ prepc.red and shipped to Color&.do to tide over any bacterial :1.rr;estir;ationa until adequate laboratory facilities are available in Denvero Part. III Grayling Fish Hatchery, Grayling, Michigan. October 16 to October 2l was spent in discussion, and hatchery tours with Dr. L. N. Allison, State Fish Patholoeis1; for the lfichiean Conservation Department.· Pertinent personal problem data mis obtainad in that Dr. Allison's work is quite similar to what mine ?.'ill be in Colorado. Technique data on disease treatment was interchanged and many or his personal observations ware made available to me. He corrluctod 1118 on to'Ul".'J of the CTayllng Hatchery, Hunt Creek Experimental area., Oden Hatchery, and other poim.g of interest from a fishery standpoint. The fishery meeting of the Michigan Conservation Department am the Fisheries Research Institute of Michigan University was in progress at Higeins Lake near RoscomT!lOn, K:tchiga.n. Several of these me€t1~a wre attended. �- 3 - !n-terest.ine comparisons bet-,!()en the i.r methods of hatchery operat,ion and ours we!'O made possible by attendance a.t these meetings. Another !ntcrestinc sideline comrers~tion ,ms conducted w1 th Ur. Veroon A plegete on techniques cf -rro:! r construction and fish trapping methodeo The special tour of duty ms concluded on October 24 when I returned to Denver via commercial airlines. Part IV. Cost of Trips 1. Travel a. Commercial airlines b. Bus $181.20 2. Meals 163.20 4. Kit. llaooous (Includes telegrams, telephore calls 1.30 ). Room 69.;s 17.73 cab rare and baggo.ge checks) Total .... - - O.1t-of-state authorization .fu.'1d ?lo. 21L6 an.owed $684.70 1'or t.his trip. Respeett"ully submitted, /s/ W. R. Sea.ma.rf W. R. Seaman Fish Technician IV. �I. Titler Wa1."ra 1' ,_. ~ Fist. Tlroduct.ion at Vlray Hatchery, Wray, Colorado n. Dates October 26, 19h9 III. Suparvieorc T. Y. L,nch, Fiah Technicirui IV. IVo Introductions The general t:rern for ..,.~rm water .fish production at the hatcheries of the U. S. Fish e.nd Wlldlife Service is to produce as many fiah as poseible per hatchery p~r ~t:.r. In order to do ao they have to asacr1tice the size of the .fiah produced. Tho average size fish that they produce is two inches o Tho e t.oc1dng of new ta:nn pooos or other virgin waters with a balanced population of sJ.Mll size fish is an excellent wa;y to provide good fishing 1n ouch natera. The u. s. Fish and Wild.lite produces a. major part or their fish tor atocki~ such waters. To use the same procedure in stockif\1 watens which already contain a fish population has aeldom proved satisfactory. F.ach water area must conta1.n a natural ha.lance bet·.~cn the nmriber of forage fish and the number of pl"edat.or f:tsh be~ :ruch a i:ro:~er aroa can provide good tishingo In most or the V!O:tcr s.reas of Colorndo there is a definite over population ot forage fish, nm it io evidznt therefore that such waters nead to be stocked ·,;ith p'.';"Odator spooice" For over 20 ~ar-a the Colorado Game and Fish Depart."Te.nt M.S been stocking millions of S?M.ll si2ed fish and today there is very ~tt.lo ilrq:,roVL"T.lerrt in the grade or our warm water fi.Bhingo Since '.i'3 have tried small a :!.zed fish and they have failed, the obvious co,1clueion v~-ould ba that we need to stock larger size predator fish. The limltinc f~c·::.or ln real"ine larger size predator fish is that we will have to sacrii' ice the production of larger numbers for size. VI Sutm11ary: Durine the Spring of 1949, an exp€!'iilental pl.An for rearing Baas and Bluegill was nrranged ·rrli.h Mr. lJ.oyd S11edhin, Superintendent of the Wray Unit, "'1th the app1"0val of Mr, R. 11. Arrlrems, Fiell Manager~ and Mro J. Ho Halc!e::nen, Superl.ntendent of Fish Productiono (See the Department Report, "Warm W&tsr Fish Produotion at the Wray Unit", March 22, 1949). Tm results of thu plan are as follows s lo The Large Houth Black Bass reared at the Wray thit this 19ar averaged four inches iruJtoad of the usual t-rro inches . The number produced averagfld much lower than tho&e produced in past ,ears o lh.a,984 fish were produced am all except 1,918 wre stockedo ·i·ha 1,918 &!'e being held over for spri~ atoc~. 2. During 1949 4B6,900 Bluegill Sunfish, which are used as to1"8$e fish, were produced at the Wray thito These fish averaged 3/4 inch in length at the time they were stockedo The survival rate for s~h srn~ll size fish is approximately five per cent, and since there is very little need for forage fish, the Bluegill have beeJ'.l removod from the Wray Hatchery. Some production ot this species will be umortaken at the rear11'€ ponds at Two �Buttes Reservoir. The removal or the Blueeill will add more pond apace for rearing larger siee predator fish at the Wray Unit. The plan for 19.50 will be similar to that UBed during 1949. ·Every availle pond and method for rearinc large eize predator Bass will be w,ed. There may be some possibility or producing fish that 11111 average more than four incheo. 'l'he Las Ard.mu Unit will al.so be used to produce predator fish. �Io Titlm: Frogl.'"e~ llo Dates November 28, 1949 III. Super-rl.sor1 'fiel'.,Oi""~ of Holbrook take W. D. Klein, ~-upt. or Fish P-eeec.rch IV. Investigator: '?. ll. Iqnch, Fish Technician IV. V. Introductions The purpose of' this report ie to present a description of the condition of the present fish population, arrl t'le result.a of the various Fish Managment praoticeB which haw bean ·tried at Holbrook 1'.Aike. Holbrook Lal:e is loco.ted too miles nr,rth of &.rl.n.'t, Otero County, Ooloradoo VI • Summa.ryt 1. For three ~:-ea1"3, 1947 to 1949, three Fish He..nagement practices haw baen used at Holbrook Lake as corrective measures to improve arm water fishing. The practices oor-e, Fish population reduction B. A controlled stocking program C. Bru19h shelter construction Ao . 2. During 19ll8-49, 16!h0$3 f:lah or 11Jl920 pounda of rough tish {foraga apociea) were r.emoved r:rom tht? lakG by seining, trappi~, and eel·lCtiw derrising.. The th00ey behind this popuL'1tion rethlotion plan wsa 1 By reducing the i"iah popu.l.?.tion ot Ule lake, it wo-uld release the pressure upon the a:rnU.able food aupplyJ thereby lessening the compet,ition n.nong the r~m.ng fisho 3. Hov,ever, &i;ce the major pr.r.t of the fish popl>.lation corusista ot forage species, the reduction •:rould be uselass unl0ea a~ough predator fish 'ffllre precen·~ tc co:1trol them. Thsrcfcre, dur10€ 1946 and 1949, lS0,600 pre<lato:i:- and pa~ial p:i.-edstor fish nre planted in the lake urrler the controllod stocking plan. 4. The kno,m su.rrlval r--tc cf fry nnd ~11 fingerlings ia ver,y low. It i9 apparent. that tl4.e sumval ra-te of the small f1sh stocked during 19L.8 at Holbrook L'Jlctl wns v ry ];:);y. An ea~imate or the e1Ul"Vival rata is as .f'ollO'fl'Ss Large Uoutil ma.ck !lass 2% of the total mt'.lber stocked. Channel C-1.tf'ish 12% of the total number stoc ,:ed. 5o The gl"O\rt.h rate of t!:o bru:s m:lch did survive was normal, the same was true for the CL nn~l Catfish. This is a eocd indication that the food supply for the predatoz- apeoies is plentiful. 6. 50,000 Bluegill Sunfish, a fol.'~gc :tis!,, ,.ore st.ocked durir2g 19h8. Although the surnve.l r-e.te of these fish ,ma ;;ood, the gro..th rate 'ffll.S very poor~ The poo:..• gro,vth r·ata of these fish would in:iicate that the fuod r1upply or !,he forage 3peciee is inadequate o �7. Although ther-3 ho.s °003n oom,, 1'eduotion in the numbers of Carp, Green Sun:ish, and Bul:i.he~, t'he lake still contains an abundance ot these fil!ho Fv.rthe;- stocki!l{; of pl--edat.or .fieh should be ma.do, ho11Sver the eioe or the fleh e ;ockcd should be larger to insure a better sumval rate. 8. The stcekinc 0£ larc;a:r f'ieh 'w.s bson started at the lakeo 2,000 era:ppi~ ~ to 7 imh'='IG ar:d 2r.o, 7 in.ch Ring Perch were stocked t.hia tall o ~1e primar"J' ob jeet of stocking the8€ fish was to introduce a partial. pr-:;dato1· s ;:xiei,c 'iitd.ch Might provide some control or the rom.ge species as troll as fur;·,iah a bettar type of catchable ti.ah tor the fisherman. 9. In future stocklne some co:.isidera-t,ion should be givm to the type of predator fiah which can be used most e recti~ely in this lake. Si~e the wate:.-s of Holbrook kke are rather turbid, eight teedere such as the Bass nat·1l"ally J::.cve a hard time obtaining food. 'l'he Channel Catrish ie mlcll bet'rer eqi:,1pped to get alo~ in such watere, this fish depems up'>n smell ror its food. Every encourage!.118nt tor better harvest or the fish crop am aey method that might, provide tor a better fish hannst should ba put into effect at the lalceo 10. Duri~ the uir?ter of 1946, 47 brush shelters were installed at tba lake for the prom.-,tion of a better tieh harvost. (See Department . Report,, "B:ruah Shelt.ers for Holbl'OOk Lake", January .30, 1949). �.' . ·, I .. Titlss hogre3S •R~p-0rl on Righ I.akea Stockir.g Expe~-nent, 1949 !Io Dateit DeM~~r l, 1949 ll!o Su.perlm;~ndentt Wo Do t1.ei.'l IV. lnt,roduction1 . In 1948 it was decided to obtain aom9 much raeedad information on . ,mat sizaa am apeoiea ot trout stockad ia. high lakos wuld give tho beat returns to the !'1:marmenD • Fiabhook am u:aat Lakes on the Continsntal Divids abova Stee:mboat Si:rings 118%'8 chosen for the e~rimettt. The experiment is eonfinsd to co?nparative returrJJ to t~ fisher- man frol?l e:cp~rimental pla~a or· rairbcws:-.and nativaso Vo Progress to Date·s In 1948 a· basic survey ms conducted on Fish Hook am Lost Lakes by meni>ers of the t1ah research dir.,.zion to determ~ e:dstd.1"~ ti.Eh populatioz,..s, and phyaical.t chemicsl ard biological conditiom tbat 'W0Uld have a bearing on the stocking expar.lmento Brien~ this im.t:Jatig:stion produced the ·rollom.ng da.tas 1. Fish Hook Laxe_, a o 511.a.-face acreage - - 8 .S . b .. · Depth- average· depth )ol feet., greatest doptll 6 te!)t., a o Fish population - Brook t:rout .d. Trout· iood conditiona - good . • e. Spa~ a:eas - gcod, inlet am outlet. 2o Lost Lakes a. 5urtace acreaga - - J$ b. Depth - average depth 9 o2 .te~t, greatsat d~pth 28 test o c. Fish population - nearly bnrran, only one larga ndnbcnr caught. inn~roua gill net sets. d. Trout food conditions .. fair, not aa eood aa Fish Hook e. Spawning areas - none • The initial e,cperl.T'llent~ plant 7i8S made on Septt:mber 20, 1948 Ylhsn 2,125 native fry ~re stoc~oo in Fiall Hook lake and 3,750 fistive fey were plc-i.ntc!d in Lost Lake. No :f'urthar ·plantings "Were ~.ade unt11 Septambsr 1 9 19490 At t.liia t:tre 1,0 five inch rainbo77S e.nd 1,o62 ·c,hres inch rainbow were placed in Fi.ish Hook Lake. At the ean:e ti.nm Lost Lake was stock~ m.th lSO f1"9'8 i."'l~i. ~i!".how '3.?'Jd 1,075 t.liraa inch rairbowo The three ani five inch lots of f iah 't'rere marked by fin clippings o �It. was origir.ally plsnned to m.~a identical plants of r.ativa and rai-ncow, ho·~ver, di3aired eizes or tha two species wen mt anilable at the times they were needed tor planting. Thia tact lessens the value or tha e~riment, but i t is fe1t acme ftrJ' usetul. intomation can s-t,ill be cbt,ained from the plantings madeo VI. Future Planas Du.ring the summers ot 19SO am· 19Sl it will be necessary to station a man at tha la!:ea to check creel.a. One man will be able to •Gheck both lakas as they are nearq adjacant: to each ot.~. ~spectfully submitteda ~~. W. D~ lClein Supt. of Fish Research -- �Titl9t: Im"t;ct.i.;.atton cf ral! er .. ~ , located at the head.waters of Gru?zp-Croet, 10 mile."' !loW. o.f Colorado Springe. I!. Datci December 5:, 1949 IV. !nvestiw,.torst -W. B. Pc?:i::tne, Fte:1 Teohni.cian I V. Introductionc F. 0c11.ey, Wai·dcn • i'his dcpartm10nt wc.w int re.sted ln the fish V£.lues of Palmer Like, ao it was decided. to run G. f.lold iIWe$tigat1on before making reeomenda.tions on O'ltr otocld.ng poJJ.eyo VI • Sttm!.'!Jlll")'I 1. The l.a.k~ ts for.: ~c by a rock and gravel dam about 2$ teet high am. 250 f.et lone, 1.'n:, lake iteelf is 6oo feet long and 450 teet wide m.th a. t.o'i;o.l of cix surface acres. The •ter 111 suppliod by 2 o:)r"i.ng inlf:Jt~, flowing less than 1/2 CoF oP ..S., and tllso by api•in..; l"\hmi'f cl!leb ,ea.ra 2o The flow from ttc lnkc into Camp Creek is regulated by a valw and by an overflow outlet o 3. 4. VII o The study of the Ja1,:(. Ehom:?d e.s follo~s a. b. c. d. Predomimnt deco::rrplSOO (.Tanite bottom Shore vegetat:i.on ;;-.ostly grass Alea.e - co71'.ron; n:!.zher plants - raro. Sbl:nne::- :nin!'l~WS ob.-=c:-ved along shore line and in the inlet. N,o trou L vre-ro observed. e. L:i.tt.le fluetu.:!t-1.-:>n. This lake is owned by C1eo. W. Strake am is under License Preae1'VEl No. 591, .m~.ch ox,riires in January of 19500 Reeommendat ions a Unless the License Prer;ol"'la :.s renem3d it is recommended that the lake be stoc:lted w:t-t;h legal ei~.e l."e.in'boffll ~ , upon agreement with the owner that it be opened -~o ·t;he pnblie rorf'Ishing. �I. Titles 6S<)o - 7000 Foot Altitude Suney u. • Da-ul I Deceuer 9, 1949 III. Superv1eor1 IV• Investigators V. Introductions a. M. Ancmms, Fish Manager w. Re Seaman, Fish Technician IV Upon the request of Fish Manager Ro M. Andrews., an altitude aurvq Methods used wei,a comparison of altimeter readings on the grounti and checking or bench ma$& and contour maps. fbe purpose in mind 1i8S to find vmat trout lakes would be e.treeted by lowering the altitude regulatiGns on lakes from 7p000 feet to 6,SOO feet-. 0r Colo·rado' s main drainages was begun. 1n Sep'tember. VI. Conclusions 1 Although the survey is not completed, present data seems to indicate that an eleva-tion limit of 6,SOO feat would mt adversel.y affect, any 19ar-round wam uater fishing. By the same token ver.v rew oont-nversial trout lakes would be removed from year-round fishing by a 6,$00 f'eet elevation limit. The problem appears to evolve into one ot individual ol~sure by eommission action of an:y-· lakee containimg trout tba t are not desired to be opened to ,ear-round fishing. VII. Investigationc I. Lakes containing trout below 6,Soo feet altitude. 1. Fort Collins Area - Halligan Reservoir, Seaman Reservoir, No. 2 Reservoir. 2o Boulder Area 3. Denver Area 4. - Allen's Lake, Marshall Lake -Soda Lake Lower warm water areae - Several lakes containing trout such as North Sterl.ing Reservoir, Danielson1s Ponds and Fort Morgan Ponds in the South PJ.e;t,te Valley•ami Uast7 Lake, two Buttes Reservoir, and Byan Ponds in the Arkansas Valley. II• S u ~ 1)6 date show only two lakes eon\iDing tzout to be between 6;,SOO am1· 7,ooo feet. These are Cheesemen Reservoir on the South Platte and l'omlment Reservoir on Monument 0:reak. III. Following are 6,$00 and 7,000 foot altitude points on Oolorado 1 s main Drainages. �-2Alti'hude Locations .Dpinap Poudre River 6_,.Soo Junction of Elkhorn Cnek above the narrows 7,000 Indian Meadows 2. No. Fork Poudre 6,)00 7,000 Head of llalllgan Reservoir River 3. Big Thompson 6,500 7,000 Quillan Gulch 2 miles above Drake 4o lo. st. Vrain 6,SOO) No road access to these·points. Sto Vrain s. So.Creek 6,$00 6. Boulder Creek 6,SOO 7,000 0.3 miles ·above Wo. Boulder liireek 7o So. Boulder Creek 6,SOO 1.2 miles ab~ve Denver Wat$r Dam (no .road) Jumtion ot ForQthe Canon (no road) Clear Creek ,.;oo 7,000 Junetion of -'Elk. Creak 2 m1-les. below.highway 3lmctiou at base or F1oJd Hill. 9. Bear Creek 6,$00 7,000 1 mile abow Idledale Lower city lim1ts of EvergNen 10, So. Platte River 6,Soo l .~ miles above ·W~gwam Greek 1.2 Jttiles above Cheeseman Beservoir 6,SOO 2 • i ¢les be·low Buffalo· Creek No.dlita as yet 1. River Creek 8C> Q]sn Comfort 7,000) Both are ai the base·ot Cook Mountain 7,000 7,000 7,000 ll. No. Fork South Platte River- St. Cloud Postoffioe - Rampton' s 7,000 1.$.miles above Ooft1~2 Gulch Junction ot W.dcq.e S~a rain 1 •.3 miles below Noe Boulder Qzeak 12. Laramie River Nothing below 7.,000 ft. in .Colorado 13. No. Platte River Nothing below 7,;000 ft. in Colorado 14. Yampa River ]5. White liver 16. Colorado River 170 Frying Pan River 18. Roaring Folk Ri'\fer 6,Soo 7,000 o.2 miles above ·Milner No data 6,500 Junction or Miller Greek below Buford 7,000 No data 6,;oo 7,000 mo data Highway bridge at mouth of Gore Oan7on 6,500 lone 7,000 6,~ 7,000 0 .3 mil~UI above Taylor Creek above Castles Below Basalt 1 mile abwe Sho'wmass �~ / //\'\. . ' . / ,r, 4ltitude Locations No Data 20. No. Fork Gunnison River 6,)00 6,SOo 6,. 7,000 7;000 ~ S.$ miles up Mwid7 Creek 1.7 miles above junction or Coal Creek on Anthracite ereek 2.a,, miles above junction of Anthracite C%eek on Coal Creek 0,2 miles above Oases.de Creek on Ceal Creek 2 .2 miles below ju.notion of Dark ~ n en Anthracite Creek. 21. Gunnison Ri'Ver 6,!$00 7,ooo In Black Canyon near mouth ot Otlrecanti Ok. 22. Uncompab.gnt River 61 ,00 71000 Town of Eldredge 0.2 miles above Ridgway No data 23. Ian Miguel River No data 2J.io Dolores River No data (Near town of Dolores) 2$. Animas River 6,SOO 7,GOO ~o l.S miles belcJw BockwOod 26. Pine Biver 6,500 l miles above I.g.nacio 27. San Juan Bi.imr 71000 3 miles above Bayfield 6.,Soo 1.7 miles be1aw Trujillo l~S miles below Pagasa Springs 71 000 28. Rio Grande River 29. PurgatG>ire Ri'Ver 30. Huerfano River No data (below Alamosa) 6;SOO 7,000 Segundo 6,Soo Badito 0.1 miles above Gardner 7,000 0.2 miles above Weston 31. Arkansa River No data (near Sal 1ria) 32. Monument Res·ervoir elevation· 6,9SO Yonumsnt Creek �I. Title: The \"inrm -:,·a.tP-r F:Lsh P.esef.rch Frogrrm That ~,as Carried Out During 1949, and The lie;, Program for 1950. II. Date: Decenber 22, 1949 III. f>eraonnelr R. M. Andrews, Fish Manager w. D. Klein, Supt. of Fish Research T. M. Lynch, Fish Technician IV Robert Evans, Fish Technician II Lloyd Swed.bin, Supt. ,':ray Hatchery A great deal of extra help was given by: Jack 11.. Simson, Supt of Fish Distribution The Ward0n Force and many other Department members. IVo Research: Biolocical data was collected and fish growth rate studies were made on the following waters: 1. Two Buttes Reservoir in Daca County 2. Narriquinnep Roaervoir, in Mor-tezuma County J. Thurston Lake, in Prowers County 4. 5. Minnequa Lake, in Pueblo C0tmty Ordway Reservoir, near Ordw.ly, Colorado 6. IIasty Lake., in Bent County 7. John ?lartin Reservoir, in Bent County 80 9. 10. Jaclreon Reservoir, in Morgan County I.fl.tote Lake, in Huerfano, County North Sterling Reservoir, in Lognn County 11. Jumbo Reservoir, near Crook, Colorado 12. Pls.tta River, near Fort Morgan, Colorado 13. Box Elder Creek, near Hudson, Colorado 14. So. Pa~mee Creek, near New Raymer, Colorado 15. Holbrook Lake in otero County 16. Olney Springs Reservoir, in Crowley County V. Salvage Operations: 1. Ft. Collins C5-ty Park Lnlce 2. Greeley City Park Lake J. North Starling Reservoir Outlet 4. S. Jumbo Reservoir Outlet Adobe Creek, l.as Ar.iimes Fish removed and restocked from the above waters numbered 93,077 or 7,174 pounds. VI. Management Practice: During 1947 a management program was set up at Holbrook Lake which consist ed of population reduction, controlled stocking and �....... - 2 - improvement of fish harvest. carried out, l. During 1949 the foll0l1i.ng work was 36 brush shelters were placed in tho la~ to promte a better fish harvest. 2. 96,870 or 6,538.5 pounds of rough fish were renoved from the lake. 3. 2,200 brood fish, 5-7 inches (Crappie-Ring Perch) Tl8r8 stocked. VII. ' r Fish acquired by trade: 1. 1"1alleyes .from Nebraska. 8.,318, - 2 inch walleyes for trout. 2. Channel Cat.fish i'rom South Dakota for 12 Colorado turkeys. J. Bass f'rom Johnson Pond at Julesburg for bullheads. 4. Bullheads from 1,1 arshall Pond a.· La Junta for trout. 5. Free Channel Catfish trom Kansas - 1,200. 6. Repe.:d Norgr~n Pond .360 Bass, 1,500 bluegill for 2,500 mixed speciP-e in 1948. VIII. Warm Vlater Fish Stocked During 1949. Lako, C!'owley County - ~ ,20, mixed species - crappie, * 1. Meridith ring perch and bass. * 2. Bonham Ponds, Logan County - 600 crappie * 3. So. rawnee Creek, 'iteld 6ounty - 1,599 crappie -t.· 4. Lovola.rrl Lake, Poulder County, 14,000 mixed a :,ecies * 5. City Park Lako1 Fort Collins, ;·reld County, 1 1 693 crappie * 6. Rese?"'1oir !Yo. 4, "iield County - 1 1800 cra:,pie * 7. Doedecker Reservoir, ,:eld County - 1,935 crappie * 8. Sloans and Rocky :.iourrtain Lakes in Denver - 2,49.3 crappie *9. Holbrook Lake, otero County, 2,200 crapyie and Ring ?ereh ?lorth r:ashington Park Lake in Denver, 5,985 mixed fish. Hot Creek, Conejos County, 3,930 Ring Perch *12. Brush, Colorndo Ponds - 2,100 crappie *l3. Ft. Uorgm. City Pond, 2,079 cr3ppie *14• ?.kFarla.m Ponds, J.iorgan County, 1,092 crappie *15. Long Pond, rJeld Co1.lllty - 2,120 mixed species *16. Rocky Ridge Reservoir, Weld County - 3,500 mixed species *17. La Junta City Park Pond, Otero County, 496 Sunfish and bullheads *10. * All the above waters were stocked with Salvage fish. Mixed species were crappie, bass, sunfish., and ring perch. The waters listed below wa.re stocked from the hatchery or with trade fish, 18. 19. a>. 2l.. 22. North Sterling Reservoir., L.>gan County - 1,482 walleyes, 1,233 Channel Catfish. Minnequa Lake, Pueblo County, 2133 walleyes, 4,.340 bass ?Jee Oronde Reservoir, Kiowa County, 4,731 walleyes Ordway Reservoir, Crowley County, 1.,960 bass and 4,000 blueglll McFarland Pond, Morgm County, 102 bass, 2.,000 bluegill �..,.... - 3 . 23. Beavtr ?on~a, Yur.m C0u.nty, 500 bass, 1,oco bluegill 24. Two Buttes Reaervoir, E'&ea County - 40,000 tluot:;1ll 25. John lfaz-tin Rcser"loir, 4J.o ,1,oo blueE;ill, 5100 bass, 681 Channel 26. Platte River, llorcan County, 11 500 Channel Ca~fish. Cat.fish IX. \',arm ,·later Fish Program for 1950 1. Collection of biolocicril data and fish growth studies uill be continued on the i'ollmdng waters: 1. Mitcte Lake, iiuer.fano County 2. Minr.equa Lake, Puebl 3 Ord;1ay Reae!"Voir, Crouley County John llartin Pesorvoir, Bent County G 4. County S. Uee Gron.de Reservoir; Pr.~wars County 6, Queens Reservoir, Prow~rs County 7. Olney Springe Ree:iervo.ir, Crm;ley County 8. ileridith Lake, Crowley County 9, 10. 2. Platte River, near Fort i.Jcrgan, Colo~udo So. Pm:neo Creek near Nmr Raymar, Golore.do A more int€1 o.i.vc ot icy i7ill b~ natle of i:;lic follm:ine watera, including all seasons: l. 2. 3. 4. Uor-l:ih Stor11=,ne Reservoir, Logan County Jumbo Reservoir, noar Crook, Colorado Two ButtcfJ Resorvolr, Baca Cot~nty Holbrook Lak~, Ot.e:i.·o County ). A general survey 't!Lll be lilf.de upon tzJ.Y r.>ther ,mters whenever there is time or need .. 4. Stocking activity will include: 1. Planning distribution 2. Securing fish a. b. fr.om other at11teo Producing our cnm Trading c. d. Through salvage ,3. Hauling, seining and stocldng 4. Intensive stocking ◊f nmr and large re3ervoirs, such asi a. Jolm Mm-tin P..eservoir, Bent Cowrty b. e. Bow.y Reservoir, Yuma County C.oorry Creek Reservoir, noar funver �... . . ., V - 45. Fish hatchery planning and mru1agement of the follcm.ng unites l. 2. Wray- Ils.tehecy a."ld Recri.ng Unit, Wray, Colorado Las Animas Hatchery and Rearing Unit, Laa ~n1mas, Colorado J. The 'l\7o Buttes Rearing r'onds, Baca County 6. other '7ork as directed. Respecti'ully' eubmitteda J,>n. 4~ T. M. Lynoh Fish Technician rv • � https://cpw.cvlcollections.org/files/original/3534bec592603e5caeb31bf71ccbf010.pdf 14147c1b16d4268a757fba476ec34f82 PDF Text Text JJI.--0·- J ~--B-1- 'd I. Title: Returns from Plants of Marked Fish in Clear Creek II. Date: Februaryi 21, 1950 , III. Investigat~rs: IV. Introduction: I W. TJ. Klein, Supt. of Fish Research W~ R. Seaman, Fish Technician IV Recently considerable discussion has taken place regarding I pollution in C]ear Creek, in the vicinity of Idaho Springs, and its I relation to tphut. To determine if the pollution was noticeably detrimental to hatchery-reared legal size trout placed ih Clear Creek, identical plants of jaw-tagged fish were made in the fall and spring_ The results together with the data on the plants are presented in this report. '\ Voluntary returns by fishermen and warden checks were depended upon for the returns .. v. Conclusions: A. Migration returns were not of significance from a management standpoint. B. Fall plants gave poorer returns than the spring plants. This is to be expected since investigations in Colorado and in other states have usually shown fewer returns from fall plants of trout made in streams. C. ' Returns from the stocking made above Idaho Springs were definitely better than from the plant made below· the toYm. This could have resulted from on~ of three causes; less fishing pressure below Idaho Springs and consequently fewer returns than from above town, or a heavy mortality below Idaho Springs or migration out of the planting section. The former reason seems the most plausible, judging from returns to date. 1iiiil(iili~ 800wo27&95 �- 2 - D. Trout survived the vdnter both above and below Idaho Springs, but the obviously better returns from above tm-m would indicate this area should be given preference when stocking. E. Rainbows gave better returns than browns. This is ~ line with the findings from other studies made in Colorado. VI.- Fall Plant, below Idaho Springs: A. Data on Plant: 1. Location - Central C1ty bridge upstream to the lower city limits of Idaho Springs, a distance of J.5 miles. B. C. 2. Date of plant - September 16, 1948 3. Species planted - Rainbovr, brown 4. Number planted - 250 of each. 5. Averae;e length of fish - Rainbow· 8 inches; l3ro,m 8. inches,_ Returns: Rainbow Bro"t'm 2 1. Number 2 2. Percent .8 ?.figration: 1. Both of the rainbovr reported were caught about one mile below the planting section. VII. Fall Plant, above Idaho Springs: A. Data on Plant: l. Lo_cation - From the upper Idaho Springs city limits upstream to the confluence of West Clear Creek and Clear Creek., a distance of 6.5 miles. 2. Date of plant - September 15, 1948 J. Species planted - Rainbow, brown. �t -3- B. C. 4. Number planted - 750 of each, 5. Average length of fish - Rainbo-rr 8 inches; brown 8 inches. Returns: Rainbow Brown 1. Number 80 76 2. 10.7 10.1 Percent Migratiom 1. Rainbow maximwn migrations recorded were one return from tvro miles above the section, one return three miles below the section and one return from about a mile up Chicago Creek. 2. One brown recovery was obtained one mile up Chicago Creek and another two miles above the section on Clear Creek. Several lesser migrations were recorded. VIII. Spring Plant, below Idaho Springst A. Data on Plant: 1. Location - Central City bridge upstream to the lower city limits of Idaho Springs, a distance of 3.5 miles. 2. Date of plant - May 10, 1949 J. Species planted - Rainboi:r, brown. 4. 5. B. Number planted - 125 of each. Average length of fish - Rainbow 9-inches, brown 9 inches. Returns: Rainbow Brown 1. Number 4 3 2. Percent 3.2 2.4 �-4Migration: 1. One rainbow was recovered five miles· above the planting 2. One brown was recovered above the planting section and one over three miles below the planting section •. IX. Spring Plant, above Idaho Springs: A. Data on Plant: l. Location - from the upp~r Idaho Springs city limits upstream to the confluence of ~:rest Clear Creek and Clear Cree~, a distance of 6.> miles. 2. Date of plant - !lay 10, 1949 3. Species planted - Brown, rainbow. 4. Number planted - 315 of each. 5. Average length of fish - Rainbow 9 inches, bro1m 9 inches. B. Returns: Rainbow c. 1. Number 63 2. Percent 16.8 - BrOlm 52 13.9 Migration: 1., Rainbow migration was negligible. 2. Brovm migration amounted to a maximum upstream movement of tvro miles above the planting section on Clear Creek, three recoveries in West Clear Creek and one recovery in Mill Creek. �32.. I. Title: Progress Report, Antero Reservoir Studies II . Date: April 1, 1950 III. Supervisor: Y! . D. Klein, Supt. Fish Research IV. Investigators: V. Introduction: James Boyd C. A. Weberg To study the spawning migrations and to reduce the sucker population a weir and fish trap vrere installed on the South Fork of the South Platte River immediately above l\ntero Reservoir in Park County on April 12, 1949. This vras a continuation of the project established in 1947. Limited lir.mological studies were conducted in addition to the operation of the weir and trap . To determine the extent of competition for food between the two species and to detennine to v1hat extent trout fed upon the suckers, trout and sucker sto:nachs were collected. This yeax suckers were caught in large enough quantities to make it practical to transport them to the State Fish Hatchery in Buena Vista to be utilized in lieu of carp for feeding trout. Fishermen on the reservoir were checked periodically to obtain t he catch per man hour, and to obtain accurate information on the tagged fish that were caught. A combined micration, fish census c?nd Treir efficiency study was ~ a: - - made in August, 1949 with the use of an electric shocking device in the t; (0 ~ ~ ~- r - , " ' =N ; ~ o =o ~ == 0 stream above t he weir. A test plant of 1,132 brook trout nas made in the Antero Annex. These fish were obtained by shocking the fish in Big Spring Creek, a ~-CD o::::= 6<->::::= small spring fed tributary to .J\ntero Reservoir. �- 2 VI. Summary of Previous Years Operations: Prior to the installation of the weir and fish trap in April 1949, there had been four attempts at trapping fish from Antero Reservoir. Due to high water, shifting bottom and large amounts of debris, the previous weirs washed out at intervals. tions was very incomplete . Data collected. under these condi- The fish caught in these operations were tagged and the results are SUiil!Tlarized in the following table: TABLE I Number Tra1/hed 5/9 7 to Humber Trapped Number Tranped Number Trapped 4/28;48 to 5/18/48 9/11148 to 11/9/48 Species 5/29/47 9/17/47 to 11/7/47 Brook 2 379 3 911 Rainbow 0 2 281 0 Brown 0 40 0 52 Hestern Tih.i.te Sucker 0 0 1,751 0 Long Nosed Sucker 0 0 1,610 0 In the fall of 1947, a transplant of 220 of tirn brook trout was r.iade to Cottornrood Lake above Buena Vista in Chaffee County. Results of this plant were covered in a :report by Ur. ':i . R. Seaman, entitled 11 Fish Trapping and Tegging Operations at Jl.ntero Reservoir, Fall 1947 11 • VII. --·eu- I nstallation, 1949 A vreir a'1d trap, of much sounder construction than any p r eiriously used, nas installed on A;'.)ril 12, 1949. This weir remained in constant operation until October 20, 1949 rrhen it had to be removed because of ic e . During this period there i.·:ere no nash-outs, but for over a month during June md July, the water T!as flo~ ri.ng completel:,r over the weir. �- 3 }.1any fis h wer e able to swim around or over t he weir during this period of high water . VIII. Tagging Operations, 1949: A total of 3,391 trout were caught , measured, tagged and released during the 1949 seasono Of these trout, 260 ,rar e tagged during shock- i ng oiirer~tions in the stream above the weir in August of 1949. The t abl e below c ontains the species, number and average size of all trout tagged in 1949: TABLE II TROUT TAGGED 1949, Number, Average Size IX. Species Nunber Average Size Brook 2,697 11.9 i nches Rainbow 463 15.2 i nches Brown 231 16.0 inches Migration Periods, 1949: The peak periods of migration of the various species of fish in A::-1te~o Reservoir were as follons: Rainbow - - - - - July 7 to July 10, 1949 Brook Bro,,m ,n.pril 28 to rAay 2, 1949 - - - - - .- - - No distinct ?ealc, but gradual spotty nigration upstream from I\pril 1 2 to October 20, 1949 . X. Sucker Catch: J\ppro.ximately fourteen and a half tons of suckers y;er e disposed of i n the combined trapping and gill net oper~tions in the 1949 se ason. Of t hese suckers , about eleven tons were transported to the State Fish Hatchery at Buena Vista where they were utilized in the diet of the hatchery trout . �- 4 These suckers averaged eleven inches in length., and eight and a half ounces in weight. They nere a combination of the Western ·::bite and the LonG Nosed species } but were predominately the \Testern Uhite. The suckers used at the Buena Vista Hatchery fo:!:' trout food were valued at roughly ~~700.00. An additional three to:i.s of suckers were c aught in the trapping operations, and a half ton in the gill net operations. These suckers were not caught in large enough numbers to make it economical to transport them to the hatc~ery, so they were disposed of in the most practical manner. XI. Census Operations , Scuth Fork of t:-1e South Platte, 1949: A ce::1sus was taken on the South Fork of the South Platte River, using a.,."1 electrical shocking device, from August 16 to August 23., 1949. The primary purpose of this census was to study the migration of trout and the efficiency of the ·rreir. The fish were shocked by a f i ve man crew with no attempt being rnade to get a complete census, ho1rever a good sample of the fish populatLon in the stream at this time was obtained. Approximately four m.:iles of privately mmed str8am , starting onehalf mile above the t:-:-ap, was not sampled. Shocking wa3 continuous from the trap to the pri.vate property anc was resumed from the uppe:::' boundary of the 63 Ranch (four Jlliles upstream) . From this point, tri.e sampbng was continuous for one--half to three- quarters mile at a stretch, omitting one mile betneen stte ~chss, to a point appro:i:imately twenty stream miles above the reservoir c Tagged trout were found ranging from the trap to nineteen stream miles above the reservoir, nhich is not necessarily the limit to the �- 5migration. Fishermen have reported C;:!.tchi n~ tagged trout in the tribu- taries of the South Fork far above this point. A total of 155 Brook trout, eleven inches in length and over., was recorded in the shocked portion of the twenty miles of stream. Of these fish, there vrere sixty- three tagged and ninety- two untagged. This gives a percentage of 4o.6 tagged brooks to 59.4 percent untagged, and would indicate the trap and weir to be only about 40% efficient. Fish under eleven inches in length could pass through the weir. The same portion of stream was shocked in the spring of 1948. fen brook trout eleven inc'.1es or over v,er e found at that time . Very Therefore, it is assumed that ferr broolrn from the rese1·voir reside in the stream throu[;hout the yea1~. XII. ~pawning Population: A total of 2., 272 brook trout vrns tagged with metal jai'f tags and released upstream from April 12 to August 23, 1949. Applying the observed mortality, only 2,272 tagged brook trout proceeded upstream. If 4o% of the total upstream migrants vrere tagged, (based on the weir efficiency) 5,680 brook trout evidently went upstream from April 12 to August 23, 1949. An additional 239 brooks were tagged at the trap from August 24 to October 20, 1949. This indicates that the total spa,ming run of brook trout, as of October 20, 1949., was roughly 5,919. There was a total of 215 brown trout logged at the trap on their upstream migration in 1949. Undoubtedly many brmms went around or over the trap during the period of high water, since they nere runninc at this time. However, no br01ms nere recovered durinG the stream c ensus opera- tions , making it impossible to compute the escapement . �- 6 The fact that no brown trout ~-,ere recovered while shocking the upper portions of the stream indicates that their spavming migration is much shorter (less than six miles) than that of the brook and rainborr. XIII. Mortality: There was a total of 2.34 tagged trout found dead on or in the immediate vicinity of the weir from April 12, to October 20, 1949. Of these dead trout there were 222 brook, 6 rainbow and 6 brorm or a total of 6.9% of the tagged 1949 migrants. This loss was high and undoubtedly the hand- ling of the trout at the trap combined n ith the type of weir used, contributed substantially to this loss. loss from natural causes. However, there was also a considerable The trout found dead were carefully examined and approximatel y So% of them had piercing .-rounds typical of those made by the Great Blue Heron. About twenty of these birds remained in the vicinity of Antero Reservoir during the summer. Experience gained in 1949 will enable future trapping operations of this type to be conducted with a minimum loss of t r out. XI . Returns of Tagced Trout to the Trap : The table below presents the percent of r eturn to the trap of the trout t agged in pr evious years operations. The trout found dead were subtracted from the total number tagged in the corresponding years before computing the following data: TABLE III TAGGED FISH RETURNED TO TRAP SEecies Number Tagged 1948 Return to Trap Numbe r Upstream 1949 Percent Brook 895 124 13.8% Rai nbow 270 28 10.3% Brown 51 14 27.4% �- 7 From data obtained on the efficiency of the trap, theoretically 184 trout, or 20. 5 percent of the 895 brook tagged in 1948 returned to the stream to spawn in 1949. XV. Downstream Migration: To obtain information on the downward migration of the trout tha t went upstream to spavm, a donnstream trap was installed. fish r efused to ent er t hi s trap . However, t he Consequently, to pass the trout back dovm over the weir, shocking ·was the only alternative. The data obtained on the length of time spent upstream bJ the migr ants is not accurate to the exact date, since it rras impr actical to shock above the weir every day. However, average figures on the length of time spent upstream were obtained. The rainborr trout was the only species re- covered in sufficient numbers on its dOTmstream mi gration to base a r eport on. A total of 281 rainbovrs was tagged on thei r upstream migr at i on. Of these 281 trout, 65 or 23 percent }'fere caught and recorded as they were returning to the lake. Individual r ainbov:s wer e upstream for a minimum of five days and a maximum of forty ei ght days. The average time spent upstream was ei ghteen days per trout. XVI . Tagged Trout Caught by Fishermen The follovring table, based on tag returns obt ained from fishermen, gives the p ercent of tagged fish r ecovered by specie s for each year . totals for each year and for the three years involved are given. Also �- 8 TABLE DI T.AGGED FISH RETURNS, NULffiER, PERCENT SEecies Total Caught Number To Caught 1949 Tagged Caught 1947 Caught 1948 N umber Percent lfov. Percent N umber Percent Number lz 1949 1947 Drook 148 0 0 8 5 0 0 5% Rainbow 40 0 0 0 0 0 0 0 Brown 2 0 0 0 0 0 0 0 SEecies Number Tagged Caught 1948 Caught 1949 Percent Number Percent Number 1948 Brook 895 13 1.4 35 3.9 5.3% Rainbow 270 25 9.2 10 3. 7 12.9% Brown 51 1 1.9 1 1.9 3.8% Species Number Tagged Caught 1949 Number Percent 1949 Br ook 2,475 h6 1.8 1.8% Rainbow 457 37 B.o 8.0% Brorm 225 3 1.3 1.3~ In table V data on l ocation of the -tagged fish c atch is given by year and species. It is interesting to note that some of the trout did leave the reservoir by means of the bottom outlet . The lake i s maintai ned at a depth of about twenty-eight feet, and no water r an over the spillway duri ng the period of this study. A substantial number of t agged trout were recovered in t he stream above the reservoir even tho'.lgh most of this area is private and posted. �TABLE V TAGGED FISH RETURNS BY LOCATION Number Percent Caught Caught Species Number Year T~g9ed Tagged Brook 1947 148 1948 Antero Reservoir 6 4.1 " II ti II Above Reservoir 1 .6 II II II II Below Reservoir 1 .6 Rainbow II 2 11 Antero Reservoir 0 0 Brorm II 40 II .l\ntero Reservoir 0 0 Brook . 1948 895 1948 Antero Reservoir 6 .6 II II II ti Above neservoir 2 .2 11 II II 11 Big Spring Creek 5 .5 11 270 II Antero Reservoir 17 6.2 II II II 11 Above Reservoir 8 2.9 Brovm II 51 II Above Reservoir 1 1.9 Brook 1948 895 1949 Antero Reservoir 26 2.9 II II II II Above Reservoir 6 .6 II II II II Below Reservoir 2 .2 II II II 11 Big Spring Creek 1 .1 II .._ 270 tr Antero Reservoir 3 1.1 II II 11 11 Above Reservoir 7 2.5 Brown II 51 11 Above Reservoir 1 1.9 Brook 1949 2,475 1949 Antero Reservoir 7 .2 11 fl II 11 Above Reservoir 36 1.4 11 II II II Belo,;r Reservoir 3 .1 Rainbo.-r II 457 II .llntero Reservoir 26 5.6 II II II ti Above Reservoir 10 2.1 II II II II Below Reservoir 1 .2 II 225 II Antero Reservoir 2 .8 Rainbov; Rainbow Brovm Year Caught Location Caught �- 10 XVII, The Catch per llan Hour The catch per man hour nas computed from checks made by research per sonnel. Periodic checks by menber s of the research crew ,rere made around the reservoir to contact fishermen and to obtain information as to the number of hours spent fishing and the resulting number of fish caught. The follovd.ng table contains the number of hours spent fishing, the :.1umber of fish caught, the c atch per man hour by the neek., and the catch per man hour for the entire season. TABLE VI CATCH PER HAN HOUR - ANTERO RESERVOIR 1949 Number of Fish Caught Fisherman Hours Catch per Man Hour 5/22 - 5/28 271 1,125 .24 5/24 - 6/4 50 126 ,39 6/5 - 6/11 23 124 .18 6/12 - 6/18 44 452 .09 6/19 - 6/25 0 0 0 6/26 - 7/2 15 30 .50 7/3 - 7/9 35 43 ,86 7/10 - 7/16 14 58 .24 7/17 - 8/6 0 g 0 8/7 - 8/13 6 8 ,75 8/14 - 8/20 29 21 1.38 8/21 - B/27 .. 4 45 .08 8/28 - 9/3 6 4 1.50 9/4 - 9/17 0 0 0 9/18 - 9/24 23 88 .26 9/25 - 10/1 13 50 .26 TOTAL 533 2 174 .245 lfeek �- 11 A breakdown of the fisherr1an catch gives the folloning data on the species, number and average size of the trout caught at Antero Reservoir : TABLE VII AVERAGE SIZE OF TROUT FROH FISHERJiJAN IS CATCH Species Number Brook 439 11 .611 Rainbo.-r 76 13.011 Br01m 18 14.3 11 533 11 •.9 11 Total XVIII. Average Size Antero Annex: Ju1 eighty acre lake at the northeast end of 1'. ntero Reservoir and connected to the reservoir by a s mall channel was checked to determine existing fish populations and its suitability for trout. Gill net sets made in this annex caught suckers but no trout. The water in the ;\nnex gave a pH reading of 10.0, which is very hii;h. .Since no trout were re- covered and the pH in the Annex was exceptionally high, it was decided to make a test plant before considering the Annex for routine stocking,. Big Spring Creek, a smal l tributary to Antero Reservoir, was s hocked aad 1,132 brook trout ranging in length from four to nine inches (average five inches) were recovered. October 15, 1949, These fish were planted in the Annex Prior to the planting, the channel con.11ecting Antero Reservoir and the Annex was blocked off to pr event the fish from entering the reservoir. The Annex ·will be carefully c hecked in the s pring for rrinter kill and gill nets 11ill be set to check survival and condition of t he trout . �- 12 XIX. Gill Net Operations: To obtain t rout and sucker stonachs for future analysis, gill nets fifty feet in length, five feet in depth and with three-quarters to three inch graduation in mesh, v,rere set intermittently throuGhout the season. Also, trout stomachs were obtained from fishermen v,rhenever possible. A total of 186 trout was caught in gill nets fr om April 7 to November 1, 1949. Data on 161 of these fish is summarized in the following t wo tables. The largest trout caught in the nets ·was a Brown Twenty- seven inches i n l ength and eight and a half pounds in wei ght. The trout and sucker stomachs have not all been analyzed at this time. They will be reported on at a l ater d ate. TABLE VIII GILL NET CATCH BY MONTH Brook Averaee Size Rainbow Br01m Number Average Size Number J\.v er~e Size Month Number April 16 13.6 11 9 14.6 11 4 22.5 11 May 36 13,3 11 l 9.0 11 5 21.2 11 June 23 13.7 11 3 15. 0 11 6 16.8 11 July 7 11.1 11 3 15. 6 11 2 20.5 11 Au6 ust 4 10.7 11 4 15.7" 2 20. 0 11 September 4 13.5}1 12 1306 11 3 17.0 11 October 2 12.2 11 10 14cJl1 _£ 21.4 11 TOTAL 92 13.1" 42 13.1511 27 18.5 11 �- 13 TABLE IX GII.J, NET CATCH BY SPECIES Species Number Percent Brook 92 57. 2 Rainbow 42 26. 0 Brovm 27 16. 8 161 100 TOTAL xx. Conclusions: The successful operation of a weir and fish trap at Antero this year enabled data to be accumulated of considerable value for fish management. Discovery of an early major run of brook trout in July is of obvious importance from e. management standpoint, both in the reservoir and in the tributary stream. However, there is doubt as to whether this run is of annual occurance or was correlated with the unseasonal high water that occurred in July. This poi nt would have to be decided before management practices could be established that would take full advantage of the situatL:m. Should it ever be deemed advisable by the Department to move the .l\nter o t rout to Yraters where they could be more readily caur,ht , the July run of brook trout is well suited for that ~mrpose . Observations i ndicate that many of the fry of rainbmr and brook r e sultinG from the reservoir spavmers rer:i.ain in the stream until they are about seven inches l ong. This fact coupled uit~1 the presence of about 6, 000 mature brook trout and an untold number of suckers in the stream for over trro months during the summer and fall , must strain to the utmost the carrying capacity of the stream for a stream distance of about twenty miles above the reservoir. �- 14 Large brown trout were recovered in gill nets set near the bottom outlet of the reservoir in the fall of the year. Examination of the reproduc- tive organs indicated that these fish were spawning in the :immediate area where they were caught . Since few really large browns were caught in the trap, many of these larger fish may prefer to spavm in the lake. Some information 1'las gathered on the spa,ming and migration habits of the bro1Am. bow. They did not migrate as far upstream as the brook and rain- Stream census operations vrere conducted about six stream miles above the reservoir and no brovms were recovered. Interference by private land oTmers prevented shocking the lower portion of the stream to determine where the brown trout were s paYming in this section. A short spring-fed tributary running from one to three c. f.s. vras utilized extensively by the brmm for spawning. lfany large broTm trout were r ecovered, tagged and r eleased in this one-half mile of stream during the spaYmir1g season. Removal of approximately fourteen tons of mature suckers at the trap should prove beneficial to the trout in the reservoir. These mature suckers are too large for trout to feed upon, and they compete (directl y or indir ectly) to some extent , tlth trout for food. There is little r eason to be- lieve that continued trapping of suckers on their spa,minc migration wot0_d materially decrease the annual crop of suckers in the reservoir~ The reproductive potential of the suckers pr obably is high enough to enable them to maintain their numbers with but a relatively sr.i.all number of spa·rmers in the tributaries combined with a plentiful supply of suckers that spa,m in the lake. It could be expected that continuous trapping and removal of the spawning suckers would bring about many ecological changes in both �- 15 the reservoir and the stream. trout. These changes should be of benefit to the However, the entire ecological picture is very complex and no ac - curate predictions as to what specific changes and benefits might occur from continuous removal of the spavming suckers can be made. On the basis of the 1949 catch of suckers in the trap, a continuous sucker removal program over a period of years nould be virtually self- sustaining from an economic standpoint. Judging from the t ag returns, creel checks and general observations, the trout in Antero remain relatively inaccessable to the fishermen. It is most unfortunate that the stream above Antero is closed to the general public since the early run of brooks would undoubtedly furnish good fishing during the latter part of the sU1TIP.l8r. J\lthough Antero Reservoir cannot be classed as a good fishing lake so far as the general fishing public is concerned, it does have a very definite attraction for 11 big fish" enthusiasts. Like many other trout waters, the good fisherman, acqu ainted nith the area, often goes home wi th a nice catch. In September of 1949 some very excellent catches were made on flies in the late evening. These catches included several trout over six pounds and one br01-m weighing over ten pounds. The value of the lake is further in- creased by its proximity t o population centers. Certainly, .l\ntero Reservoir is entitled to more consideration from t l1e Department than it has in the past and should be included in the annual stocking progran. Findings to date indicate that plantings of fry or fingerling trout would be of most benefit. The lake contains enormous beds of ag_uatic vegetation that will help the small trout to escape predation and c annibalism. Legal size trout are not recommended, chiefly because they will give a greater return to the fisherman when placed in streams and small lakes. �- 16 I n com~ection Trith the stocking mentioned above, it is possible the natural r eproduction non occurinG may be stocking the r eservoir to its carryinG capacity. In this event, planting of small trout by the depart- ment vrould not be benefj_cial. However, the most practical method of settling this point is to start and continue plants in the reservoir for several years. It is our belief that the tributaries are carrying trout to capacity but not the lake. In any event, sufficient data is now avail- able to enable research personnel t o determine whether or not any stocking carried on is pr oving beneficial. According to tag returns , rainbows were more readily caught than the other two species of trout in the reservoir. This coincides with data gathered on rainbon trout in other ,,raters throughout the state. Also, tag returns indicate that the brooks -riere more easily caught than the brovms. The data beine; gathered at Antero wi ll find increasingly greater practical application as the many impound,iients scheduled for construction and novr under construction are completed. Of course, each bocy of nater presents individual probl ems but the information obtained on life histories and feeding habits of the three species of trout, the suckers and the C:ypriiiids flD'lll1d in Antero will hel p greatly in solving these problems • .Also, this project has furnished necessary training to ne~·r employees., There is every reason to believe that the studies co~ducted at Anter o vrill enable recommendations to be made that will make this reservoir more valuable to the fishermen of the state. To complete the studies now underway, it is recommended that the operations at J\ntero Reser voir be continued for one more year. �33 Io Title: First year Returns from Trout Tagged in 1949 II. Date: Aprill, 1950 III. Superintendent: IV. Introduction: W. D. Klein Plantings of tagged trout (metal jaw tac; used) were made in Vclrious vraters throughout the st~te in 1949 nhere it nas desired to obtain ansYvers to specifi c questions on migration or general information on r eturns to the fisherman. Returns were voluntary from fishermen, or from department ·vvardens who happened to check fishermen having marked fish. It is very difficult to compare r eturns from p2.ants made in different waters, because these returns are directly correlated with fishing pressure . 1..e can only estimate fishing pressure. If the reader makes any attempt to compare the returns from different waters, it should also be remembered that, generally speaki:1g, the sr:ialJ_er the body of vrater the greater the percentage of trout caught, and streams and rivers usually give a hieher fi rst year return t:..an do lakes and reservoirs. The conclusions presented in this repor t , relative to return3 to fishermen, amount to estimates b ased on three years of returns from this type of tagging and our lmonledge of fishing pr essure on the bodies of water concerned. Growth data can only be considered as a rough indication of trout growth in each case . There is considerable v ariation from the average size in any one plant of the tagged fish. J\lso, some fishermen •will measure the fish accurately, while others will not. Of course, a large number of tag returns vrill give more accurate growth data than only a few· returns. 1~~1I~11ij'ij1~'1ll1li11i1i~~1l~~11~111]~1Ifij11 BDOW027897 �- 2 - Migration data is reliable when sufficient returns are obtained. Each plant is considered individually on the following pages. V. Two Buttes Reservoir, near Lamar: A. Data on Plant: Date planted - February 25, 1949 Species Planted - Rainbow Mumber Planted - 500 Average size of fish - 9 inches. B. Returns: Mumber - 27 Percent - 5.4 Number caught by the month: c. March April 3 20 May 2 July Sept. l l Growth: - 25 Number of samples Average length of fish in inches - 11. 0 Growth in inches - 2. 0 D. Conclusions: 1. Growth is good. 2. The majority of the trout are caught in the spring months. This ,·.ould indicate that either the fish are nearly fished out early in the season, or with the e.dvent oi warm weather, they do not bite. The few returns would indicate the latter. �- 3 VI. North Sterlinc Reservoir, near Sterling A. Data on Plant: Date Planted - April 12, 1949 Species Planted - Rainbow Number Planted - 500 Average size of fish - 9 inches B. Returns: Number - 47 Percent - 9.4 Number caught by months: April May June 7 3 July 17 6 0 August Sept. 4 October 8 November 1 December l c. Growth: Number of Samples - 44 Ji.:verage length of fish in inches - 12.8 Growth in inches D. 3.8 Migration: Five trout or 10.6% of the returns were obtained below the reservoir from the irrigation ditch. E. Conclusions: 1. Growth is good. 2. It is interesting to note the returns do not follow the same pattern, as to time (by month) of return, that returns from Two. Buttes Reservoir follow. Judging from the greater number of re- turns from North Sterling in the summer months, the water temperature probably stays lower in North Sterling than in Trro Buttes. �-43. Migration through the outlet tube into the irrigation ditch is probably a source of a consistent atmual loss of trout planted in this ·reservoir. VII. Surmnit Lake, top of Loveland Pass: A. Data on Plant: Date planted - July 19, 1949 Species planted - Rainbow Number planted - 500 Average length of fish - 9 inches. B. Returns: Number - 54 Percent - 10.8 C. Conclusions:: Returns were good considering the fish we~e not planted until the latter part of July. VIII.· Grand Lake, town of Grand Lake: A. Data on plant: Date planted - August 11, 1949 Species planted - Rainbow Nwnber planted - 500 Average length of fish - 8 inches B. Returns: Number - 45 Percent - 8.8 C. Migration: One fish was caught in the spillway belo1·1 Shadoirr Ilountain Reservoir. D. Conclusions: Returns were normal considering the late date of the plant. �-5IX. Evergreen Reservoir, near Denver: A.. Data on Plant: Date planted - March 17, 1949 Species Planted - Browns Number planted - 400 Average length of fish - 7.5 inches. B. Returns: Number - 58 Percent - 14..5 c. Growth: Number of samples - 52 Average length of' fish inches - 10.5 Growth inches - 3.0 D. Migration: Five trout, or 8.6%, were caught below the damo E. Conclusions: Growth and returns from this reservoir were good. A consistent migration can be anticipated over the dam (downward) since a now over the spillway is maintained throughout the year. X. Alexander Lake, Grand Mesa: A. Data on Plant: Date planted - June 29, 1949 Species planted - Rainbow Number planted - 500 Average length of fish - 9 inches. �-6,I B. Returns: Number - 57 Percent - 11.4 c. Grovrth: Number of samples - 46 Average length of fish, inches - 10.8 Growth, inches - 1.8 D. l.!igration: None E. Conclusions: Alexander Lake has been regarded as poor fishing for a number of years. Local fishermen usually place the blame for this condition on the large sucker population. Since the lake has both a s 1Jrface and bottom outlet and is used as an irrigation reservoir, it was thought that migration out of the lake might have accounted for the reportedly poor fishing. However, tag returns to date do not sub- stantiate this theory. The tag returns compared favorably with returns from other lakes and possibly the sucker "nuisance factor" is causing the local sportsmen to avoid the lake and regard it as poorer fishing than it actually is. F. Recommendations: Continue to stock Alexander Lake with a regular allotment of legal fish as determined by acreage, etc. V �- 7XI. Soda Lake, near Denver: A. Data on Plant: Date planted - May 3, 1949 Species planted - Rainbow Number planted - 399 Average length of fish - 8.0 inches B. c. Returns: Number - 91 Percent - 22.8 Growth: Number of samples - 90 Average length of fish, inches - 9.8 Gro,·,t,h., inches - 1.8 D. Conclusions: Returns were good and gronth ·r.ras good. XII. Chambers Lake, Larimer County: A. Data on Plant: Date planted - August 2, 1949 Species planted - Rainbow Number planted - 500 Average length of fish - 8.0 inches B. Returns: c. Number - 43 Percent - 8.6 Grmnh: Number of samples - 31 Average length of fish, inches - 8.9 Gr01·rth, inches - .9 �- 8D. Migration: Only one recovery was reported from below the reservoir. E. Conclusions: Considering that the plant was made in Lugust, returns and growth were normal. It nas suspected that considerable downward migration from the reservoir occurred. Returns to date have not indicated this to be true. XIII. Shadow Mountain Reservoir, near Grand Lake. A. Data on Plant: Date planted - January 2, 1949 Species planted - Rainbow and Brovm Mumber planted - 500 rainbow, 500 brovm Average size of fish - Rainbow - 9 inches Brown - 8.5 inches B. Returns: c. Rainbow Br01m Ml.nnbers 11 17 Percent 2.2 3.4 Growth: Rainbow Brotm !Jumber of samples 10 17 Average length of fish, inches 9.7 9.7 rJ 1.2 Gro1·-rth, inches D. • I Migration: Two Browns (11.8%) and one rainbow (9.1%) were recovered below the dam. Six brovn,s ( 35. 3%) and eight rainbows ( 72. 7%) vrere caught in the North Fork of the Colorado, a short distance above the reservoir. �-9 E. Conclusions: These returns vtere poor.. However., returns the .first year from previous plants have sometimes been low, usually follovred by good second year returns. It is difficult to say YThy such a large per- centage of both the browns and rainbows were caught in the tributary stream. Future returns may help clarify the matter. G1"owth was not good, but the limited number of samples makes growth returns of little sicnificanceG !f the trout entered the tributary soon after planting and remained there until caught, gro11th as shown from the limited returns could be expected. XIV. Vallecito Reservoir, near Durango: A. Data on Plant: Date planted - l.Iay 4, 1949 $pecies· planted - Rainbow Number planted - 500 Average size of fish - 8.5 inches. B. Returns: Numbers - 21 Percent - 4.2 C. Growth: Number of samples - 19 Average length of fish, inches - 10.4 Grm·rth, inches - l. 9 D. Conclusions: Returns from this plant were poor. of 12.8% in the first year. previous plant. A previous plant gave returns Growth was also less than in the �- 10 ._I XV. Chief Creek., near Wray: A. Data on Plant: Date planted - May 5., 1949 Species planted - Browns Number planted - 250 Average size of fish - 9.0 inches B. Returns: Numbers 45 - 18.0% Percent C. Conclusions: Returns were good. XVI. Republican River., near 1Tray: A. Data on Plant: Date planted - Ilay 5, 191~9 Species Planted - Browns Number planted - 250 Average size of fish - 9 inches. B. Returns: Numbers - Percent - c. 32 12.8 Conclusions: These returns are low·er than returns from a similar plant in Chief Creek. However., the difference is not regarded as significant •.. �- 11 XVII. Colorado River, Secti,on 3, Palisade Dam to Roaring For k : A. Data on Pl ant! Dat e planted ,... March 51 1949 Species planted - Rainbovr and Brovm Number planted - Rainbow $00; Br own 500 Average size of fish - Rainbo-rr 9 inches , Brown 7 inches . B. c. Returns : Rai !'lbow Brovm Numbers 41 14 Percent 8. 2 2.8 Growth: Rainbo,·r Brown - Number of samples 35 11 Average length of fish, inches 10.3 9.0 Growth, inches 1.3 2 .0 D. Conclusions: Considering the size of the river , t hese r eturns ar e not abnormally low. The poorer br01m r eturns coincide nith pr evious findings on comparative pl ants of brmms and r ainbows. can probably be c onsidered nor mal. Growth Horrever, r eturns particularly in the case of the brovms, were too f ew to be of much significance nhen considering growth. XVIII. Colorado River , Section 3, Roaring Fork to Power Plant : A. Data on ? lant: Date planted - ijarch 5, 1949 Species pl anted - RainboH; Br own Number plant ed - i1ainborr 500, Br01m 500 Averace size of fish - Rainb01·r 9 inches ; Brorm 7 inches. �., 13 D. 1Iigration: These trout vrere pla:ited i n a short section, about t ,;10 miles long . Thirty- two of the returns were caught b elow the section wi t h a ma."'Cimum dmmstream return of 40 mil es. One catch was made tvrenty- five miles and one at seventeen miles below the section. Returns from six to tvrelve miles below the secti on were common. Six fish .-,ere returned .:rom above t h e planting section with a maximum recorded upstream movement of one- half mile. E. Conclusions : Higration was extensive and should be tal-::en into consideration by distribution ~)ersonnel ,·rhen planting t:1is area. Gror;th was good. �Io Titlei Trout r;g,:; mid. B:roodst,~k Invei::t:J.cat,ion., Massachusetts II. Date: June 29, 1950 Ill. Supe:t"visort IVo Investigatort V. Introduction, Ro Mc Andrew-a, Fish Manager C. N.. Feast, Jro, Fish Cultur.ist I In accordance with instructions given me by the Colorado Game and Fish Department, I departed via United Airlims for Boston on Juno 16, 19.50. The purpose of nzy- trip was to secure all possible in.formation rE:garding epawntaking i'rom the Plymouth Rock Trout Company- and the Ca.pa Cod Trout Company. On June 17, 1950, I went to Wareham, t!assachu.setto to inspect the Cape Cod Trout Company owned by llr o Kenneth Graham. Jtme 19, 195'0 was spent a-t Cape Codo I inspected the Plymouth Rock Trout Co:mpt:.n;r., Plymouth, Uassachusetts, mmed by Ur. W. Yio i'ih:1.ting, June 20 1 21, and 22, 1950. I retul'ned to Denver via airlines June 23, 1950. The foll07ling is submitted as a report of my studies and observati:ms at the afcrementioned stat,ionso PLYMOUTH ROOK '1'ROU1' COMPANY Ao General Dasorlpt:ion: The company eor.1..CJiata of .four installations, two of them being leased, Pl;ympton ru1£i ~tbury. There o!U"e a small number of ponds appro:ld.IJW.tGly a mile a"Wr£¥ :from the main installation at Plyrnout,h. Thero are no buildings at- any of the places except at Plymouth. There are six butldirlgsJ the fesd house, tuo tool ehedea a hatehery building, an offic'3, and a garage,. Everything is kept in neat order, in good ehnpe, snd co~aratively clean. The grass is cut around all ponds And all buildings were noot and orderl.yo The Plymouth Rook Trout Com.:>any is Q well organized brood stationo The ma.in source of water at all four impoundim~nts is artesian wells. ?ipes are 3unk at various locations on the property and the water is piped to the racewayso The year around water tel'll>erature at Plymouth is approrlmately SOOF., ,vhile at; Plympton and Duxbury it is approximately l.6°f'o Tho water was tested for acid content and sho'V78d a low pHo �.. - 2 ... Co Plzysical Factors: The h.'!ltchery ie of th'3 type similar to those 1n Coloradoo !t contains e:!.gttoan ti•ougrm, twelve L"lchea wide by eighteen feet long, inside moesurom:r:.tso The troughs are constructed of lumber and are lined with galvanized irono The lining is painted with varnish and then painted ,nth a mixture of black asphalt and varnish as are the trays and dam bonrds. The dam boards are used to dam the water between the trays. Each board is approximately one inch wide and three-quart'3I's inch thick. The egg trays are constructed completely or wire mesh, consequently the eggs do not com in contact with w·ood of :my sort. The amount of raceways consists of 2,507 feet at P'.cymouth, 1.,320 feGt e.t Duxbury, and approximately 1,000 .feet at Plympton. There are ttvo dirt ponds at Plymouth 'twenty-four feet by ninetythree feet e.rxi one thirty foot square board-sided pond. There are two ponds at Plympton ,iith an orea of two hundred square feet eacho ft.ll the rece'il&yo ure gr .i11al-bottomed and board-sided, built with untreated woo:1.. The brooder r.ri.ces are from sS"«en to eieht feet Wide while the ponds wh~re smaller fish al"8 kept are from three to six .feet ride. The water- depth in the brooder races averages i'rom two to two and or.e--h,'.:\lf foot with one to one and one-half' feet in the fry raceso The uate:r depth is greeter in the larger pondso All fry and yer:rlings 1!"0 1leld in th9 upper raceways at Plymouth and yaarlings are tal-::sn to th-:'! oth,~r tvro iLipoun~nta where they are held u..'ltil throo yec:3' ol :;-1 and then they ere brought back to Plymoutho The screons a.r/3 eit~"1r l: 'Dl"cl slats or metal slats, which are used in all ponc'.s o~ept, thooe nitlch contain try and there wire screens are usedo There :Ls ap;:,r.•c-r.lr 'l"~ely !~00-500 gru.lons of water per minute running through t.he bro• der ponds. Thia amount is aoout the same for all three i.in::,oundmo: .tao The fry ponds &re cleaned once a. week whereas other ponds are not clem19d unless it is absolutely necessary in order to save fisho The feed house is "'.ocated at the first raceway of brooders o It contains a grinder and meh necessary equipment that is need0d for grinding .feed. It als • contains an electric pump which is used for eircu.lation of wnter. After eru,h feeding, on warm days., the pump is turned on and left 1~ ·:i!1g from four to eight hours; Tlhichever amount of time is needed. Do Fish - (Handling, Sel( :tivity, and Segregation): The .first fall a 'ter ~awning and the following spring., all the small and weak .fish a: i3 t aken out of the chosen brood stocko The same procedure ia don men the f1.sh become two year oldso The fish are spawned for the f •rst time when they are three year olds o The fall preceding the f-J~•st spawn, the males and females are separatedo During spamling tlle t ireo year old males are used for all female • brood stock. No ma.lf·s are kept from year to year o The "leather- �- .3 bellies II or non-sci; p:i. oduc 'll"S ( three year ol d females) are placed iu a pond and kept i'o:.♦ one yanro If by the second year they do not give eggG., thoy are then put in vdtb the aelllne stocko The fis-b are spannad for four Yl:!ars., therefore the l ast spmmed females are six years old. Tb..:. s-;_:,w.ners are seg-.i"egated as to age., each raeeway holdir.g a. diffe...-ent agod fish; with all t he older fish a.t the lower end of' racevmys" f,t the beeinning of 'l:.he spawning season there is one enpty pond e.nd by this lTJBMS they can keep the fish separated a.i'ter they are apa'\7l'ledo 4 All the eggs that are lett aver ( those that are not sold), all tho males (after they i-w,e ooen used in spawning), all tle small and -weak fish that had been picked out previously, am all the "leatherbelliee" ~e raieed on the plaoe and sold men they reach a size or ten to twelve inch0so The t,hree year old trout averages one- half to one and one-half pour..dso i'iith plenty of' room and ideal conditions it will reaeh tr,o pou.ndso Eo Diets: Yo,mg fry ere f3d fL.--iely ground beef liver five times a dayo As they 6"':"orr older the BT:Y.>unt is cut iio th!"ee tinl3s a day and at the end of the fi.rst seru.• they a.:r-a ?\~oeiving the same diet as the 1:u"ger fish. Tu-coders are .fed three times a trocko Once a week tmy get e. meet diet consisting of pork lungs and beef liver- at a ratio of 2:lo The othel" ti7o times a s:~~k thoy get a !'ish di0t of whiting., herring., or salmon ( the small salmo:i being fed whole ) o There is no cooldng of the food and also no dry feed is mixed in. The salt wa.ter .fish (either fresh or frozen) i3 ground a-id fedo A dry feed was tried and melts 11ere also tried but neither uere found to be satis!actoryo There is no set amount of f eed per pound of' fisho Luring epam:d.17g soason,_ the brooders m-e fed only once a 1i8ek and then only the meat dieto The fish diet saei:1ed to affect the eggso Mro Whiting, ovmsr, said ~-.h at the best possible meat diet is pork heartso Red flesh and gc xi growth .ras the result when the hearts were usedo Fo DisesseControl1 Furl.mculosis son8ti~es broke out directly after sptmni.ngo By treating with sulfa mera.Jine (eight grams per 100 fish)., the disease was cleared. up ru.~er a n.umber of doseso The sulfa is mixed with the feed, this being the only time that a dry feed is used, and i t is used at theoe t imes to 1'9ep t he medicine with the food. At one time costia appeared in the fry,, This was treated with sa.ltJ one pound per cub:..c foot of water with two doses for twenty minutes each. Fung,'.s d:'.seases and other such diseases ere usually �-4treated ,·rlt.h saltc r~1•. l.bitln:; believes t hr..t a certain amount of inrm.mization is built up ai't:.:?X' a nwnber of years of keeping t he sane stocko No new strains of .f'l .:.:b. a.re entered into his stoek, thus keeping out inferior fish nnd also disensea" Thore are ~.01 000 eggs kept each year for .future brooder stock. Cape Cod keeps 80,000 Rainbou eggs and 60,000 brown eggso They take on the average of fifteen million eggs a yesr :Lrx:luding both rainbows and bro·,TI'lSo Brood stock eggs are from the largest and hsalthiest females. Thoy are placed in sp'3cie1 troughs to hatch. The 140,000 of the first hatched 3ggs are put nside for brooder stock. All the rel!laining ages are shipped as soon as t hey eye up. The eggs are taken, w.:1Shed., counted., and then placed in the trey&o There is room far one-ri..."Uf million eggs per trough, and for forty-five trays per trrugh. This gives a total of 11.,100 eggs per trayo The tray measurer.Ent.a a.re eleven a.in ono-h11lf inches wide by sixteen ani one-half inches long by one-half inch lrl.gho Thero is a steady now or imter into t~·a trouehs through a t!1ree-qu.arter inch outlet trom the feed trough. The eggs ara pfoked withoot removing the trays .from the troughs o The trays sre pheed fou:r deep, maki.r.Je up one rack., except at one end where the;;,e is only one treyo This allows for movement of the trays m-ien pickirige Aft.er the ages hm-e eyed up they are placed in a. vm.i't,e platter .;here the blmiks and weak eggs are picked off; no b.llr;,:lng of eyed eggs is doneo Tr!'sezers are "..lSad for p:tcldne. The ~ggs are shipped aft.er this op11rationo Years ago Lt.· . 1'Jliting had trouble with soft shell disease. By experimentation he found th~-';. ha could get a;q .from this disease by taking the foD.owing preeautionss a., Ho 'fflltE=-1" is allwed in the pan during spawning. bo Eggs a7·e washed ,nth spring water instead of pond watero c" The woJden troughs are lined with galvani2ed iron and the trays :ro made of metal sc!'eeningo The troughs, trays and darn bc•·1rds are all paintad with black asphalt and varnish at eac '1 change of eggs o l!JVerything is washed before paintiri~. d., All p .,,k1nc; am countinc equipment is kept sterilized. This conclude"" all the informatlo11 from the P'.cymouth Rock 'frout Conpanyo �-5- c/IPE COD TROUT C01KPAt1Y Ao General Descriptions This conpan;y consists of ·iwo installations, approximately ten ~Ues apllrl.. At the -~jru:eham iD;,oundment they keep sailing stock and brovm trout broodors., .At Frogs Foot they keep rainbow brooders,, fey,, and seL1ing stocko The hatchery and a small uarming bou.ae are the only two buildh'lge at Frogs Footo A store house and feed house are at the Worehruu :!.mpoundmento Porris and buil dings were all in a eta.ta of disorder. T'.ais trout company is not orgmized as well as the Plymouth Rock Trout Corrpany., The following information will deal with the Frogs Foot station where the rainbow brood stock is kepto Bo Waters Tbs source is ~l"ing vuter· now1ng appronmately 400-500 gallons per minute. 'i'h..~ terq, e:rature we1·aees i'orty-oeven and forty-eight degrees Fo year around. . Co Physical Footorst '!'here are 1,.260 feet of r~~.ye and three dirt pond.so Tha ponds m-e t;rnmt;r f ~gt rrl.da and i;'l;;O of them are eighty-one feet long arrl the third ie 1;'0 feet long. The depth of wat,er in the ponds is between four :j_nd .five feet" The raceways are board-..aided and sandbottoood., Fl·y and :r~arl:lngs m-e kept at the upper endo Below the ft-y' ponds ru:-e the raeas holding the selling stock. The lower end of races contain the brood stock., The measurements of the brood racGirays are as f ollowe i 1'.'idth Average Len..,,e,t,h Water depth Five feet Fift.y-i'ive feet Tt-io feat Cubic Foat of water per race 648 Number of wooders per raeo - 7$0 (average) The try ponds srs cl0anoo oma every two 1i8eks., Wooden slat screens are usedo The a.sroa.t ing device is a pt.:rrp which lifts the water out of the pond and drops it, over iron rack~:io The aereaitor is located at t he head of the broc,' re.ceso It is 1.sed during the swmner when there is not enough uater to supply the n unbar of i'ish on hand 0 �• - 6 Do Fish (Handling., Selectivity , and Segreaation)i Fry are kept in the hatchery until they lose their sacs and then they are put in a rooewa::,o One year old fry are sorted for size. This is done by the use of a box made of slatso The fish are crowdigd into the box and the small fish vfOrk ou.t naturallyo The little fish that work out are raised as sell.i?Jg stocko When the breeders are tuo years old they are sexed as close as possible and sized againo All little Ol'.l..as and the known Jlll.iles are put in ,nth the selling stocko The three ~ar olds are spmmed for the first time. It is found that in sexing at two years of giga an error is usually made and that tnenty-f'ive peroent of the throayear old are males, which are used on all broodorso The femtllas are kept for spawning until they die, eo bl:lnd., or get sickly looking, which is usual~ six or eight years of ageo Females that don't give eges on first spawning are consicle1•ed a.a "ba.r::cn" and are put lfith the selling stocko If a female d::>os not. give cegs wmn she is four years old or over, she is kept with t11e bx-r.;od stock., thereby giving her an opporw.nity of giv1.ng eggs t he next yeero The fernaloo 21·0 segregated as to t he tir.e of spauning. The early apauners ru_ve kept in the upper end of ·the r~tm:"QSo Females are spm~1cd nt six day i ntervals. The ll!)per 1·aee is empty \\hen starting and ths early spnun0rs ure put there and so on doun the line according to sp:iwn:.tng time. Ther-e is a small loss due to handlingo ~Hlimii,g is douo bare handed, aa Mro Graham, ovmer, beliews tha.t glows rub "c.:>o n:uch of the proteotive slim off of fishes bodies. E. Dlets The diet consists of rav1 meat and raw fish. The brood stock are fed only the mea.t diet including beef liver., llmgs, spleen, and kidneyso Thesa are mixed idth horsemaat or sorre other meat that is inexpensive.. The sGlling stock is fed rarr fish mixed with a dry fe0do Ground liver ia fed to the ftryo The fish are fed every day i f possible. l'i>}ie amount of feed is cut dom during the summer to reduce iootabolism. Brooders Qre fed once s week during s p ~ aeasono Fa D-ls8ases i Furunculosis was one of the most common diseases at Cape Cod. By treatm8nt Dnd saving fish t hat surv-lve, a degree of :lmmnmty has been establ:tsaed in the stocko At the present time there is smsll dam.ige done by disetlSCSo This concludc !3 the informaticn from Cape Cod Trout Corrpanyo �J .. - 7 - VIo Conclusions and RccoDlr.lP...ndatior:st lo The brood station must hr.vc c. good su:,iply of uater, but more important the te!iiper ature should be so that GOod growth can be attained. \':ater that avernces between forty-five and fifty-two degrees F. year around develops an early spawning date. Large ponds are best for gro,·Jth 'tut fish 3re r.tandled easier in raceweys. Conseq1 ently both ponds and 1·ac011a~rs should be provided at the brood station. In order to raise five or Gix million eggs a year, a hatchery containing at least tlrol·re to fourteen troughs should be provided at the brood station. Bg[;s should not be transported over any great distance right after they are taken. Newly spamied egcs are very susceptible to bumps and knotfking aroundo 2. Aereation o:f the uater after evacy feeding ,nll help to reduce lossc Troughs painted with bl:?.Ck asphaJ.t and varnish enable the bad eg~s to be more easily seen, and picldnc rr.1. th tweezers see.i"llS to be suitable and more ber,eficiru. t,:, the eggs than m.th bulbs. Jo It is recommended that raw r-eat be fed at least once a weak, either p:.>rk lungs or pork he~rts Iai:{cd ,nth beef liver. Experimenting should be done to deteri'.line th'.:• possibility of feeding cooked carp for the otl.t1r tY/0 mckly f ,~,.,d:tr.cs. In this case 2. vecy lou carbohytlrate par'centage should be uscdo ./llso the .!ll!!ount fed should be just sufficient to provlde growt:1 ,·;ithout fat. Ho cooked fish or earbohytlrate foods should be fed durlne spmming season. 4o Fry should be fed f inely ground liTe:i:- five times a day at the start of fgoding, docre~s:tnc to three t imes p3r day at the age of six months o After tho brooders bs.~ attained the aco of one year, feeding can l::e red•.1eod to once per day fod, which is three ti.Joos per week ~ept during spavmine s eason, when the schedule is reduced to once per weeko 5o .Af"ter attaininc spamrl.ng age, all fish should be kept in earth raceways or ponds. No ponds with oemant side or bottoms should be used. Screens should oo constructed of wooden slats or tubular metal slate, but not of sor.m material m.th sharp edges. 6" Fish should be spa,med in sterilized pans without water in the spawning pan. Eggs should be washed and water hardened in pure spring watero All other equipment used should be sterilized before using 0 7o The platter method of nnal picking should be used. not be bumped. The eggs should 80 Attar a brood stock htls been star·:.ed, a. complete record and history should be kept md, cordbined ui"i:;h research, best results can be attaim~d. iJe should devalop oui- 01m method of sexing and separation, and our own uethod of selectivit~" Dy developing our own mathods a.f'ter the br·ood &~ock is well started, we can raise fish that are more suitable to Colorado envirorment. �I ., , • - 8 - 9o A survoy of al l the units in GcJ.ot"ndo should oo made and i t is -zrr:, opinion t h;.t i t will be four.cl thet tho Gane and Fish Depsrtmmt can raise thP.ir own br"oo<l stook suecosefull.y, either at one or mre of the exict ing sta.t i ons, (J!' at a new unit, l'Thichever ia found to be most f easible .. Respectfully submitteda ~~it. C. N. Feast Fish Culturist I ' �. ,.. . .x,,- ~~ ( Io Titles El~.ant,ary .Su.~'Vsy of n,1..o!'es IUvor, from utah lin~? to Pare.dox VallCJJ:, Colorac2.'.> Ile Datea III o Investiga:liors I Ivo Jul.y 16-17,·1950 To Mo Lynch Seoti; Bessire Joseph Gray Introduction: For a number of yea~s, that poi~ion or the Dolores River between the Utah line to. t,l'E connuence of the Dolo:res and the San :W.cuel rivers, has furnished some coo1 ch:mnel catfish fishing. Very felv people know about this and probably wo~ldn't do much about it aeyhow, because of the distance from civilization an:i the rugged terrain of the areao Tha Dolores River is one or tho tributaries of the Colorado River, j~ining that rtvar in Utah4) The C0lor2do River is stocked vi.th chtmnel catfi~h in Ar:!.~oria nni Utch. /Qao ColJrado has stocked channel catfish 1n -the ColOl"n~ Ri•1er bole.- 0:-~.r.d Jur~tiono There is no evi.donce that the Dolores Riv~ v.ns ever stoclioi -nith chcru1el catfish, therefore the fish o,ist come up f.rO'.n ths Colcr£i.dc, ~1.ver. Thay are more numerous during and ~::,~:- hi:;h· wat,,r, howevm· {':. ar~at mny st~ year aroundo These fish provid,! go,:>d u,ort fo-::- t~·,e local pec~le E.S well as a tow oi..~siders, however, fishir~ pr~scrni-e in thr3 a-rea is var✓ 1·.:.ght~ v. -~ ~ummary: lo The Dolores R.i-·ror s'tm·ts ne.1r !lie.,:., Colc-rado at an olevation of 8.,900 feeto It f'lorrs 11"0at tc ~ll')'J'~S) Color ado, and tll3r~e nor':-hward to Gatmmy1 Colo::.~:1do:, r-~..:"J'·:itio:1 l//70 fe•n and then, t,lel,re miles northwest 1 w~1ere i-'~. croseas thn Colora, c--~r:.•Jh ~-1 •~, 1 The upp~ Dolores R::.var f".n:iohes fa•out fishi.i1g, ~ut belcw th49 town of DoloY'es, most t).f the mtt:e?. ls te.ken tor ir-'igation, leavir.g a small a:nomt to now northrrardo Hc:-,::s'Q'cr, it hes J!n eight:, mile t,rek between Doloras J Color~do ~nd Boorcck., c,.,1,,r~.ck, ·\-rl th a. l:irge drd.nage uea where it pi::!rs up mo-..~e watero ~.l.--ol.'l Dac.~oek, which i~ in the Pc~ndox Valley, tho Dolm-os :liver flo-m, six mi.~.ea across the Paradox Valley to its cor...fluanee 1\-it,h the S:.:.11 m.guel., five miles bi;low UraV8n., Coloradoo 11 It is from the con.i'l'.l~~e or tha Sm Mlguel and the Dolores to the utah lino, where t,he c-ha~ol catfish se~m to .find a satisfactory environmento • Tmra is no in.forr~-~t,i?:il th.at j ..nclica.tas that tbe cha.i,nel catfish ie ~a.1-.:en in either the· ro:..,ree or the Sc~ tagual s.bova the confluer..ae of t:.e-::r,e tw:> strew.a o Th.I! a.i:-ea betweeu the confluence with the San Miguel ·t.o the Utah lina is !'orty-nine mj.leso �( -2- . 2. I I I i I . The Dolor~g ?dvcr nv'h"S thrct:..gh a ra·ther. dcsm.·t co~1.tr,1 f:om Dolores, Colorado t,o the Ccnnue~e vii th the S!;..'1 M.i.guelo It is a ,·ery dry area. with hi.eh at.·mm.er t,ernpera.tu.roao :Most er the tributary-streams are intermittent, and wha?1 t.hey do now, the-J bring a l:irge amount of silt into tln 1•i•.r£~ro Tl:e water te!i1perature of the Dolo~es in this stretch is gene1•ally r~ther higho The Sen ltie,.iel is a. typical far;t £10t:dng mountain streAm with lcw Its source ia up -near Telluride, ColoradoJ elevation nbout :t0,0OJ festc- It flov;a fast r\Ild f,.iz-iously ~.o a.bout I~aturita., Colorado wi1ere it begins t<, slmv downo T.he San lfiguel joins the Dolores about five milus b0lor: Urava11, Coloradoo The lw am high water ter:par~t"JroE; at tho ,onf'lr:ar.oe are mixed and evidently- provide a satisi'acrl;ory em1.ror.uentnl 't,-emperatura £or the channel catfishv terrperat1.o."e8ri From the point cf confluence, the Dolcr0s is a i'airly fast movt_ng strGam t.ba.t. rur.s t.hrou3!1 deep rwc~ cru~or..s for about three miles., and then tln·ollgh t, lessor ca~~n to the Utah line., The d:tr~ r~d .f'.:>llc-ws the ri'\-•-sr f.ro!li Gntenmy to Ura.van, Colorac!oo There is .1 ::wo~d ,1hich follorr.:i the 1•iver tro.u Gater.'8.)" to sev~al miles ~~nd tha ut~ line tlsoo \":;ry little e;f the Dolores river in this area is closed to put:l.ic fisl:.i.ng. ( 3. Fish tror.i a fe.; inch.~s to for;r pounds r...a,:,e b~en 't,aken from thio area of the rivt~. On July 17, J.950, aa atter::p·~ wa3 cade to tr.~, aeine, a..'ld cill net fish fr;,m the riv•ar t ho·11Har the river was high~ atndey llrrl had e. ~nat df:;al c r debris !1.otd~-e through it• making it 1.~ossible to get a crtt~h. Iiowet·::i~.- nth a m:lnn0tr seins and hand lin3s1 a nuznba1· o! J..112r·::~1E wore takenc: 4o Storn!lch a.nalYEiS en tlm f:Ssh showed, 1h inch chaur.r:,le # wetgh·~ 3/i ~ pounds S - rx· .nnons, 1-! - 2 i~ch 2 - JULip..lr 'he1rles l - -plE«nt seed ins~t rt mains bi1;s .-,f Ylood 10 ino Channel, 1/2 pound 2 - mi~ovm, 2n1nch l - Juniper berry insect rema.i.ns S., A number -~r s1.1all c!:.er..nol ea.tf'ish wnra tiL~en with a minnow seine on the edg'ls of deep hc.)leso This cotJ.d be an lndication that the channel catti:;h d~ sp.~,m :·.n tlrl.s rlvero �( VIo Reco:::unend.1t ions z lo Further ati~d.J ~ho1.~:'..:t be m!l.de of this area of t ho river, with the thot1 cht in rind th::rt th.i.s .,.rea micht ba a possible s ource for fish to stock elsawh~e ,. 2o Sinee ch,.::inr'.el c atf.Lsh ~ia·7e been known to r..avo done uell in other waters of Colora<lo 1 it rA.-:..ght b'3 -pcs2ibl9 to coru:rtz-uct a trn.p similar to those naed in trout operations i n tlrl'3 sta.te, on this river to catch either np.:1,m3rs or sma:n channels fo'!' transfer to other mi.ters :more:i accessible for the fishern,en. VIIo .Limtat,ionsz The nor!ual ri•.rer fl-,w is about 1.57 second f'eot, hov,ev·~ the level can ra:i. se over a pnriod of a few hows due to the large drainage c.rea an1 the irf.j 8~.ittent t r i b~.te1rias.. In other 1','01.'ds there ;-;ouJ.d be a de.fin_. ite ls·-rol fluctuation all the tirlo ,7h.ich , rouJ.d have to be considered. Tranepc~tation ct::..ffieulties _Viould also have to be cor~idered becaus9 of th9 diat.:i.nce fro:1 +,m T.10101-eG River area to the ea.stern slope areao ( �Io Titles An E·<Parin.1,mtal Project o! Feeding Stunted Ring Perch at the Les ~-n:lmas Ha:tebe:eyo n.. DAte, October 5, 1950 IIIc Personnel, To M. Lynch, Fish Technician Joseph Gray, Fish Culturist IV. Introd.lc tion: A number of Ring Perch v.ere taken from the outlet canal of North Sterling Reservoir on July 25, 1950, 800 of these fish were held for a feeding experiment. The .fish were measured to total length and weighed, they then were divided into t;;o groups of4 00 finh each. One group was placed in an e:q:,er:l:mental pond and were fed oight pounds or meat scrap per day for a sixty day period. About 10,000 minnows were also placed in the pond for feeding purposeso The -:>ther group of fish were placed in a control pond and wring the e:xperil!ental period they wore allowed to fend for themselves with eo.:npetitlon or other fisl1 cpecies, such as Green Sunfish., bullheads and bllSSo A growth rat~ conpariaon WM mado between Minnesota Ring Perch and the Ring Perch n-hlch .re used in this experimanto Growth rate of Kinnesc.'ta fish indicates that by the end of the second year, the ring perch reach 5.4 iucheso Our fish were 4.5 inches at the start of tho third yea;,.•, indicati.ne they t'.rere st.mted. v. Summary, Average sha or-,··-fish at ~rimantal Jb_n_d_--;...---c_o_nt_r_ol_Pond _ _ _ _.,. start of --.=:.t:::: - - - 7 ..,_i..--r..;..~ , nt _ _ ::;:.,~t Gain 405 in. - l~.5:u:i:_ams_,_...,,..___4__.5'---in__.'----....15 ..........5__3__~ _ ____,. ll 6.68 in. _ 70.12..£_4.87 in. _ 21.25~....1 •~~2cl~:: - 54.5~.Jtl:~ ---•....i11i--..;..••;_,3..;..7_1n_o______,5..;..•7.,;;..2....1gr.::......:J....;;j Temperature was taken at the aurfa.ce of 0ach pond each morning at three tioos duri:ne each week of tm sixty day period. The temperature average f or August was 73°F. and for September 67.)0f. for the experimental pondo It m s 71°F for Auguat and 64.50F. for September for the control pondo �VI. Conclusion: Although the experi.n~tal pe:d.od 1'88 Tery ahort., there 1s aome indication that stunted ri..VJg pe:rch c~.n b-~ rearod to a more usable eize. However this project should bo carried out for a year period., and With a much larger number of fish befm•e it con be determined to be worthwhile 0 Northern Colora.do ,mrm water lakes contain an almost unUmited sup- ply of stunted rini; perch, which r.ould be utilised better b7 the fishermen i.f the fish wera a. few imhes 101'lg8r. �I TH,let l.'iarm w·ater Fish n.r·iJd:ict icn at Wr~ Hatchery and a D1seussion of Future flanso !Io Datea Dacemb(ir 5, 1950 IIIo Introduction: 0 Warm water fish product.ion at the r;ray Hc.tchery, at ~~ay, Colorado, wae VE:ry poor until thio year. The poor production at the Unit was probably due for tho most pai.""t upon tho lc!Ck of trainine an<.l the kno11le<3ee of the roon in chargeo The :·,ray Unit p.\'"oduc~s both warm uater fish am trouto There.fore , the man in chn2.•ee of tho prodi.ction must be able to handle both specias. T.he departxr.cmt oan only draw its f'utum superintendents .from within its own ranks ruid almost all of the men get their traini1,e in trout hatcooriee. Trout, nra hatched and roared under artificial conditions, warm water fish, such as are hatched and reared at the Wrq Unit are produced veey clooe to the natu.t"al conditions. During the r,•u.mmer of 192~9, Mr. J. K. Stead, who had been employed at a State Trout Unit, ¥!:IB chooen by the department to study 'l'ltlffl water tisho Mro Stead spent eignt weeks at -~ho Fish and v:ildlife Service Fishery Station at Tishottlneo1 Oklahoma, mrleh m1s in charge of Superintendent Ho c. TopeJ.. Mro Stead stud.5.ad b'.r actually workine ~i. th thE. fish being hatehed and reared at the stn.tiono In the spring of 19$0, Mr. stead v.as :.lSsigned to the Wr.a:;r Fish Hatchery as S11perintendento As a result of hia t r-afnine and ltnowlell'.~a of warm water fishs the produdtion of Large Y.outh Black Baas at Wray, wa; over four times grea:t.er during 1950 thrui at aey ye2r in the pasto IV. SULr rARY: l. 93,833 fioh or 651 pou.71ds of Large Mouth Black Bass, averaging thl: ,,, inches, '\'Tero produced at t.he \'tray Unit last yen.re The production L the past has been batwc0n 12,000 am 20 9 0000 2o The history of Bass fis!:ine in Colox-a.do waters appeara to be vary peculiBJ."o stock1.l'lg records shaw th~rt rnt?.ny popular fishing waters we:r.-a well stocked vrith Lm•ge !Jou.th Black Da..~s as far back as 19210 Many repeated. pl~nte of th3se fish httVe been mode since, and a.re, in .fact, still being n,.adeo Yet, bass f:l.shi..-rig in Colorado is practically nil. 3o The primacy reasons for stocking bass in Colorado waters wares ao To provide a 11•edator fish to control forage and rough fish popu- lations. bo 4o To provide & good game fish for. warm water areas of the Stateo The bass po-pulation has oovor been able to get large enough in aey wat er area to control forage and rough fish, therefore they have failed as a predator in our waters. Not mough of taese fish have been taken by the fisherllBn to make them worthwhile from the sport .fishery standpoint .. Listed belON .i s the creel census or bass cheeked from over thirty lakes, wring the past five yearss �""2 - ?lo., of Fish - Aversee length Year Checl<ed -..,.-.._.~ ... in Inehes. 1946 191.,1 37 l0ol6 62 1948 13 1,165 1950 139 1949 806 17.~ 13..5 UaOl $. Among the many peculiarities., one !actor ae001S to stand out above the others and this is: soon art.er bass are stocked in a new water area for the first time., the fi.shing is very good. In a few yeers or even less, the fishinc drops to a point 1.mere few·, if any, Bass are caught. Repeated stocldrie has done very little to improve fishing in these waters. Yet in evf!i'y lake oi- reservoir where the baas have been stocked, a small, but constant population of these fish can be found. And in most of these waters., you.rig of the year eun almost always be found. 60 This would indicatl3 that the bass can live and spmm successful~ 1n Colorado warm irater are.as., Evidently the? survival rate of the young fish is so poor., that this might well h, the reason why the bass population has !ailed t.o bacom larger o The departl.'\ent has Illltd9 a practice of stocking fry size basG, to try to reestablish baas fishing., but without a-.,)!)arent success. Here again the young fish smYlv.il. re.t3 appears s, poor. that it has caused this nethod to failo • 7o To romeey the s itu.ation, the de;iariim!rt began t.o rear bass to a larger sizG., eta.r'c.il.13 durir,c 19490 It ...~.s i'elt the:t:, a larger siae bass would have a better chance for 1::1irv.i.wu.. Tho lizr.itation or this method is, it reducea the r,u.mbe.r of fish proc.!ueed.. Thia in itself', is a serious problem, bee.a.use the.re m.·e at ·..,he present tim over one hundred public fishin£: Tmte:;.•s with fifty to 15., 000 sm'."f.aee acres, that need to be stocked with predator fiaho About fifty preclato!" f'ish per acre is needed to establish a eoou population., Fo.r exarapla, Bonny Dam, 1l3ar Hale, Colorado, a naw rese:r,roi!-., will have a m:i.n:1.t111m level or 1,500 surface acres, and at fifty predator fish per acre, 75,000 fish will be needeclo Bass production at the llra.y Unit was 9.3.,000 three inch fish, if 75,000 of these fish had been stocked at Bonny Dam, there wcru.l.d have been only 18,000 fish left to stock in the othm- lakes. Thia example should indicate the time it vdll require., barring bad luck snd undue fish leas, to hatch and rear enough fish to provide large bass populations in some of our we.tar s.reaso It is quite possible that even stocking of larger size bass may not be any more successfulo 8. At the present time, the walleyed pike, our new:cy- introwced predator f'is-h.? seems to ba mu.ch bat iier as a predator~ than the bass. Also the young fish survival rat~. of ·t;he walleye appears to be much better than the survival of young bass in our waterso If at the end of l9Sl, the survival rate of the 179,000 t'Vltl-inch walleyes stocked d ~ 1950, appears to be as good as the walleyes stocked during 1949, it might be wise to fore et the bass as a potential predator, arxl start producing walleyes at the Wray !Iatc he:..7. �-39o llm'Tover for- the pr esent t:'..ire., buss production will be continued at the Wrriy Unit, under tho -plans specified di.lri~ 19490 (See department reports, 11·warm TI'a.ter Fish Proc-tuct:lon at the W~ Unitn for March 22, 1949 and October 26, 1949.) 10. ll. .F'ish rear~d at the nray Unit besides base, during 1949 were ~ ,240 or 131 pounds of yellow perch. These fj,sh '\'Y0re taken during salvage operations and reared from Cetober 1949 until Mai-ch 1950. The total warm water fish prow.cod or reared at tho "i/ra:y Unit for 1950 was 99,037 fish or 782 pounds. Respectfully subnitted: T,{ ~ h , ~ n i o i : , flt. /«!st~;,.-;111..u:her-; LITERATURE CITED Haas , R. H~, Klein, w.n., 1946 CRF.EL CE?.BUS REPORI.", Fisheries ?.mnaeeroent Division Oolorach Gsme a.zxl Fish Department Klein, W. D., 1947 CREEL CEI-JSUS REPORl', Fisheries Management Division Colorado Game and Fish Department Klein, v7. D., 1948 CREEL CENSUS REPORr Fisheries Management D-l vision Colorado Game and Fish Department Klein, W. n., Seaman, W.R., BarrOWB, Po To 1949 CREEL CENSUS REPOR'l' Fislxlrias Managem(:flt Div-lsion Colorado Gome and Fish Department Unpublished, 1950 CREEL cmsus R'El'<:RT � https://cpw.cvlcollections.org/files/original/d3c10f296ccd1f6c8790331738e6a725.pdf 3f0fcf7af2f92c429456066df5ce435e PDF Text Text Io Title: Proerm:a Report, Fisheries Research., Febl'."1.tary 1951 II. Date: March 7, 1951 IIIo Superintendent: YI. Do Klein lo Warm nater Limited field. work was conducted at North Sterling Reservoir near Sterling. !Jost of the time in February was devoted to com- pilation of the previous sumners' data and in the preparation of a creel census reporto IL Trout Li.mited field lfOrk was conducted at Parvin Lake in Larimer Countyo The maj l)rity o.f the time was devoted to compiling field data and in the prcpar2.tion of repartso Respectfully submitted: li. D~ Klein Sup'l;., of Fish Research �I. Title; Progress Report, F:Lcht-?~i t~S Research, ?.mrch, 19!,l II. Date: April 91 1951 III. Supc,..i11tcndrmt: i•1. D. Klein I.. '..'arm '.,atar More intensi.ve stndios wo=-e started at Tv:o Duttes Reecrvoll' south of Lamar and at Jumbo Reearvoir m:th of Crook. Two tempo- rary technieinns went to work at Two Buttes on Ua.rch 16 and one man (tet:]pOl"ary) was assi(;ned tc Jumbo Reeervoi.r ?tarch 2So This additionn.J.. help will l~o raaint:rl.ned thra,lghout thn sumnr in order to continue and supplement provious studieso Llnited fi0lt! nor!.;. t-1&.s continued ut 1:orth stat•linr. Reoorvoh(near Stt~rling) Qncl at Holbrook Lukn near SWlnk. The c0r.1pil:rt.ion of 1950 field de.ta and t::o proparntion of reports continued in ~!arch as time parmittedo Ilo Trout Limited field v.ork was oor:ductod :it Parvin Lake in Lnrimer Cowity. The majority cf the time was devoted to compiling field data ani the preparnt:i.on of reportso • Reopectf'lll.ly submitted: ~y.{)J(~ ··,. D. Klein Supt" of Fish Heeearcb �I. 'l'itlo~ P:rogress Report., Fisheries Research, April 1951 II ~ Dat ei ?Jay 7, 1951 III o Superintendent.: 11. D. Klein Tho rr:s earch work c o1:timied as planned at Two Duttes Reservoir s out h of Lamar e Ilri cf s t udfos wer e conducted at Holbrook Lak e near Swink in n.n effort to recover perch spmm. No evidence of perch spa,m was obtained o 1'leather conditions were adverse for fi eld wor k in the .Arkansas Vall ey dtu-ing April and s or:ie of the investigations plmmed had to be postponedo The s t udies on Ju.rnbo and Nort h Sterling Reservoirs near Sterling were conti nuedo 2o Trout Limited field work was conducted at Pa.~ -:tn Lake in Larimer County. P!-eparutions wc:re made to trap, tac and record the spawnine run of trout from t.he l nkoo The najority of tho tine was devoted to compili.np, field data and the prepar:ition of repo:r-tso Respectfully sul:mit ted: r;" D. ]Qein Su.pt. of Fish Research �:r TJ.I. ~,np~r~ntendcmt . ··,. J ,. KJ.ein Ti:E: established rese,3.1.'cr proBra:ns on Hort(.-. '3',Pr.! 1 ll, .. r • ,-1'·✓r..~ near '> .erlir:g, Ju1r-bo reservoir north o• Crook and. 1"·1,J !Jn+Jttcs , ... \rolr aout.'1 cf La.mar, ,mre continued v:ithout inten, ·;--,d on c;.:; ··)l ··, flood ,· oncb.t.1.on~ at 'l\10 Duttes rescrvo:~r t.:1.e w.:r::.< Oj thr- lti",1 • extrer'lely r.tigh ,il.lter at '.l'wo Duttes pr oh'b:lted noraa' ~.~1..;_v:i."" i.· : ••1 l:,11t;, '!'eservoir fer about ll week an d ca11Se:i tno de::;tr·t -•~.or-. o. '"•:..• lom>r 1\;o Buttes rear2.ng -pond lc::ated b€lo11 the dar.; ~ l'i11or ::..~1'\P.s1.:i.cations were r:ia.de c.t i:~m.nq1.:c.t Ld:c ~,t P...Lel ~r• , •"' Grande ,.. Nrnr•;oir noar J..mJar, Holbrook ~k,. nor t11 ·?f St ' '11' t·' 1; .' :~• :.!artin rcc ::."Voir· r:car Las Animas. Gill nets ·,,r,;.•s cc'., - -: '.dL1,u 'l: Lake ,.n u.ri atter1pt, to recover w.tlleye pil~e previc- .,.f· lY £: ,~p .~ 1:-·.a ;! lake und to ~ampj_1; the exist:LnG fish populat·:.0•1, l c• :rnL ~)..-; ::,;:••~ recovered, 0 al:i.eye pike from preirious plants of liJ1G•~rliTl('•, •rer..: ::- :,r;,~_,,::_' f.'rom r:ee Gr:.ia.ce rese:r-voir toth b-<J fislu11r: and 1r.i t!. c~J n.. :. ~ ··, • d' the: fish caucht. rnnccd from 14 to 16 J.nches :. ;t le11f_;tli .• ~,, . i <: ap:;>ears that t:1e vra.lleye introdnction in Nee Grande wa•, fil1.c :.-- o.~r; ·u an1 may becc,me o: valualle sport fishing asset i:.o t.ht: st, ~,,·, :. :r:ations at. Lolbrook were £ cont1m1ation of .:,. long ranrv s ·:i.:dy r.:. on this 13.ke. Ji1l nets were set in John 1.iartin refierv,,:.,· t .) • ,c-: the 1ish popu2 ~rt,ion,.. !'Io white bass or waJ lt'-y~ .were rue, -v~rR.t, These tv:o 5.Jecies were :found in the lck~ last yaar and "t>ccve~·:i_N, are a.ntic:t.p"lted this year n 1.. l1. 'frout Full seal~ :'i.cld work .1.s ur.derway at P;u-vin Lakt- in J.a-.i..m• i.:· I t is int.erEstini:; to note t.nat n1 nbow t-rout. frr)r. a ~:,·n up •n 30 9 000 tl'10 ir:c~• .fingerl:~ngs r;iade :i.r, June of 1950 ent. '-!red U e c· t.:;. opcninc <la.y :i.n lnrge number~ at w1 averaco len~t.:1 of a1 oui ': ,.('°r,, ~ ~~c , •· Gounty, Asi ·'ie from Parvin La1':<'-!, mor;t o;' t i'OUt ,.icrk i)·, ',".;-;.y r.,m: --: cf compila·:.ior. of data frcm previouo fiel.d work. and vl-it-, ""rec,,:·.:: -~ '·• ' ·•eporls~ ::1: kespectfully &Ubnit'ted: ti/ f) . / . ~,<',.;¥,' - ,,, 'J:,L. ... IJ. Klein ~upt, of Fl sh .Hesearch �I. Title: Proeress Report., Fisheries Research, June., 1951 IIo Date: July 17~ 1951 III.. Superintendent: i'lo Do Klein Routine field studies wore continued at llorth Sterling Reservoir near Ster·ling and e.t Jumbo Heservoir north of Crooko Some fish population census work was conducted at Reservoir Iloo 4 near Fort Collir.s by rreans of cill nets. One thouscl.nd and eicht drum avera.cing nine inches in leneth v,ere obtained from Kansas and planted in Bonny Reservoir newr \:ray. Gill nets wer-e set in Hnrt I s Basin Reservoir near Cedm-edge to atter.ipt to recover walleye pike planted in 1950 as f:i.neerlir1gs . Ho walleye vrere recovered but the tests were not regarded as conclusive A limited runount of time was spent at Holbrook Lake near Swink on .fish census work and. cathering other routine field data. Field work was continued at Tv.t> Buttes Reservoir south of Larnaro II. Trout: AJ 1 stm,or field work r;ot underway this month., Two men are st•1dyi11G the lower Yrunpa River from Crate to its confluence vlith the Gre(m River. Basic field data is beinr: gathered that wi 11 enable the Department to deterr.dne Vlhether or not this stretch of river 1'rlll supi)ort cm:1e fish of :my kind ot her than the exist~ ch.irmel catfish populationo One man is statio:ied at Fishhook nnd Lost wkes six miles north of Rabbit Ears Pass to continue the creel check conducted last year in order to determine success to the creel of various plants of r:1arked fish !:Jade in these lakes in previous yearso Trro men are corrl ucting basic surveys on high lakes t hnt are considerGd problem lakes - lal.es that should pr-ovide good fishing 1:ut for various reasons are poor fishing at the present tim3 o It is anticipat~d that these studies ~-.1.11 supply the Dq:r nrtment with tho information that will enable sa."ne forM of corrective action to ce taken that will result in better fishing in these lakes. The majority of the problem J.akes under consideration are in North Parko �- 2 'l\vo r en are stationed in the Ra-rrah primitive area west of Glendevey wher-e intensive studies are being conducted on two lakes in t he llawah c roupo '£heir work consists of gatherinf, data on the physical aspects of the l akes , temperature studies, available trout food studies, water chemistry and a study of the existing fish populations . .Uso I fishermen's creels will be checked to ascertain fishinf; success o •rro.s work should supply valuable bac kgrou nd inforrration that will enable the Department to more efficiently manage hi.ch lakes of this typee Fielcl work is continuing as scheduled at Parvin Lake in L'J.1•imer count y o Respectfully s ubmitted: ~ 1'i. D; Klein Supto of Fi sh Research �7 /,;~ v/4,.:_, BLACK LAKE REPORT / } ~ ~ - ~ I~ ,:1,k_ If, June 29, 1?51 -~ ~ A brief survey of the fish population and environmental conditions ~ at Black Lake was conducted on June 23, and 24, 1951. Information was gathered on the physical aspects of the lake and its tributary and outlet, c hemical conditions, trout food present and existing fish population. A. Physical Aspects: 1. The lake is in a glacial basin and is relatively deep. 2. Shoal areas are limited but productive. 3. Spawning areas are limited at both the inlet and outlet. B. Chemical Conditions: 6.8 1. pH - - - - - - 2. Alkalinity ----- - phenolthalein, 0.0 p.p.m. methyl orange 12.0 p.p.m. bicarbonate radicle, 14.6 p.p.m. C~ as bi¢carbonate, 10.6 p.p.m. J. Free - - - - Surface, o.b p.p.m. 35 feet o.o p.p.m. 4. Dissolved o2 - - - - - 35 feet, 8.5 p.p.m. 5. Phospates trace (less than 3 p.p.m.) O. Trout Food Present: 1. Plancton samples were taken at the surface and at various depths .down to 90 feet. At the time of the survey the plane- ton was relatively poor. 2. Aquatic insect life was abundant in the shoal area and consisted principally of Diptera and Trichoptera. J. Freshwater shrimpor scud was abundant in the shoal areas. ;g �- 2 D. Existing Fish Population: 1. Gil l net sets caught 25 trout ranging in size from 6 to 13½ inches . The ·one rainbow caught in the nets was 13½ inches long . Brook trout caught ranged from 6 to 13 inches in length vnth an average size of about ten inches. 2. Fish caught on hook and line showed the presence of brown t rout in addition to brook and rainbow of a size similar to those rec~overed in the nets . 3/ The trout caught were in good condition considering, in the case of the rainbow trout , that the spawning period was just ending . Scales were read on three brook trout with the following results: 5. Starting 6th summer (a) 12 inch (b ) 8 inch It 3rd 11 (c) 6. 5 inch It Jr.d 11 A few tro'ljlt fingerlings were observed i n the shoal area near the inlet of the lake . Discussion The condition of the fish indicates that the lake is not over- populated at the present time and that the natunu. reproduction could be advantageously supplemented to a certain degree . The fact that a twelve inch fish in good condition is entering the sixth summer indicates that brook trout ·will probably never reach large (2 pounds or over) size in the lake. This theory could be expected to apply to a certain extent to other species of trout as well as brook in Black Lake. �I - 3 - A relatively few rainbow trout in the lake after repeated stockin~ of legal size rainbow indicates that the rainbow do not reproduce well and t hat they v ery possibly leave the lake in considerable numbers via the outlet . An appreciable number of s pawning rainbow were noted , in the stream below the lake which substantiates the latter theory. Although fertilizing of lakes for the benefit of trout is not gen~rally undertaken, it is concluded t hat the fertilization as pracJ tici1d is benefic ial if the aquatic plant life is encouraged by the applicati ons . The results of stocking should be carefully observed in order that a proper stocking plan can be worked out over a per-iod of years. Too many fish would cause stunting _and a ~esultant undesirable fish population. In connection with the development of a wise stocking plan an accurate and complete creel census should be maintained. Legal size trout of any species will temporarily improve the fish ing . However, small brook trout stocked annuall y should give a good sustained yield at a reasonable cost. RECOMMENDATIONS 1. Maintain complete and accurate r ecords on stocking and on the number, size and species of trout r emoved from the lake. 2. Annually stock fingerling brook trout (preferred size 2 inches) at the rate of 100 fish to the surface acre . This stocking rate is arbitrary and results should govern the number of fish to be stocked in future years. J. Stock fish from a boat and scatter the fish well in shoal areas away from the outlet. I ' Obtain and stock fish of recommended size as early "le in the summer season as possible . �. _,._ A RECOMMENDATION TO UTILIZE TWO TITCH HATCHERY TROUT FOR 'STOCKI!\U CERT.fl.IN 11 TYPE11 LAKES ( Presented for consideration by the Federal Aid - Fish Section) October 29, 1951 Introduct i on The Col orado Gaine and Fish Depar tment, for a number of years , has been operating under a br oad pol icy of stocki ng only l egal sized fish in bodies of water open to free public fishing &nd access ible by road. This policy was and is entirely justified pendi ng the pr esentation of facts that indicate a more desirable course of action. Facts now ava il- able indicate that modification of the above pol icy on a pl anned basis is i n order, Specifically, it is recommended that a plan be ini tiated for t he use of tno i nch hatchery t rout in st ocking 11 good11 trout l akes throughout the state and that such stockinr_; shall replace or suppl ement the stocking of legal sized trout in these waters . The submission of the above recommendation is somewhat premature at this time since final analysis of data and publicati on of results of studies ar e not yet availabl e. However, there is no doubt of the significance of the information at hand, and the advantages of pr ompt pr esentation of such data are obvious. A 0 good 11 trout lake, as referred to i n this repor t , can be briefl y defined as a t r out lake accessible by road and having a near ly constant water l evel, good trout food production and adequate cover. Before proceeding, it shoul d be clearl y understood that each body of water is a separate problem and no hard and fast rul es can be dravm up for the management of fish populations that will appl y to all �- 2 - waters. The s uccess of any program of fish management is directly dependent on t he kno':rled6 e and common sense of those field men charged with the actual management of lakes and streams . Description of Study Area Fi ndings are a result of studies conducted in Parvin Lake in Larimer County which has been operated as an experimental lake since 1949. The lake is o'.med by the Game and Fisi1 De~.n.rtment and is the result of a dam placed across the South Fork of Lone Pine Creek . lake covers sixty-two acres feet . The and has a maximum depth of about thirty The lake can be broadly cl assified as a 11 good 11 trout lake havinG adequate food, cover in the forn of rooted aquatic vegetation, and a nearl y constant vrater level. A substantial fence exists around the lake making it possible to channel all f i shermen through one entrance . Fishing Pressure Parvin Lake receives heavy fishi ng pr essure since it is adjacent to a gr avel road and about fifty miles northnest of Fort Collins. Fishinr, Population The game fish population in Parvin Lake consists primarily of rainbor1 trout . A fen brook, bro,·m and native trout are present. yellon perch occasionally enter the catch. A fevr Several species of minnows are present . Methods of Study Plants of marked fish are placed in the lake and returns are obtained by c hecking each fisherman ' s catch as he leaves the area. For �- 3 practical purposes it can be assumed that the check is one hundred percent effective . Results of Study 1. Return to the fisherman from a marked plant of 10,000 (161.3 per acre) two inch rainbow trout made August 15, 1949. 2. per (a) Percentage return -------------------- 25% (b) Number return -----~--------------- 2,,00 (c) Average length of fish caucht -------- Oo3 inches (d) Tfeight return ------------------------ 467 pounds Returns to the fisherman from a marked plant of 31,000 (500 acre) two inch rainbow trout made may 19, 1950. (a) Perc entage return ------------------- 43% (b) Number return ------------------------ 13, 330 (c) Aver age length of fish caught --------- 8.5 i nches (d) 'VIe i ght r eturn ----------------------- 2,558 pounds Figures given above pertaining to fish catch are not exact but vrill closely approximate final 1951 compilation figures. A brief review of the catch data on Parvin Lake is in order since this information further emphasizes the value of the pl ant of 31, 000 tvm inch trout made in 1950. In 1950 the fishing at Parvin Lake was sustained primarily by stocking vr.i. th legal sized rainbovr trout made on a comparable basis nith other lakes and streams in Colorado. In other words, Parvin Lake received a normal plantin: of legal sized trout as determined by the Fish Distribution Section. This normal stocking was au8mented by the plant of ti,,,ro i nch trout made in 1949, by the pl ant �- 4 of two inch trout made in 1950, by various small experimental and routine pl ants made in 1949 and by natural reproduction. During 1950 fishermen caught 13,503 trout and the average catch per man hour was 0.47. In 1951 fishermen caught approximately 11,500 trout from the 1950 plant of t,"lo inch rainbow trout. Actually, over 20, 000 trout vrere removed from the lake by fishermen and the catch per man hour uas over o.5 in 1951. The contribution to the catch of the 1950 plant of tw·o inch trout exceeded in 1951 the number of lecal sized trout that Y!ere allotted Parvin Lake in 1950. Unfortunatel y, the s tocking of t vro inch trout at a rate of 500 to the surface acre coupled 1.i. th holdover fish from other plants and natural reproduction resulted in a crowded condition that virtually stopped the gro·;,th of legal sized trout in 1 951. Obviously then, fur- ther stocking of t wo inch trout, on other than an experimental basis, nould require a reduction in numbers stocked if gro¥1th past about nine inches is preferred to numbers of fish . The exact number of tv10 inch trout that should be stocked in Pa!'vin or any other lake to establish a satisfactor y relationship betvreen size and nwnbers of fish is not kn01m. However, the limiting factor in lakes similar to Parvin is not survival of two inch fish but p roductivity of the individual water. In 11 Good 11 lakes it can be expected that plants of tvro inch fish can be used to either entirely replace plantings of lei:;nl sized trout or to greatly reduce the number of legal sized trout ne eded to produce satisfactory fishing. �- 5 Gro1Tth of hatchery trout pl anted in 11 good 11 lakes '1hen t r,o inches long can be expected to eciual or exceed in some cases growth obtained at s ome of our hatcheries ~rhere water teuper"tures are low. The two inch trout stocl:ed in Parvin Lake in 1950 Grew an average of 6. 2 inches in one year . Field Observations Substantiatinc the Advisability of Stocking Small Trout in Certain Lakes Butte La~e in North Park has eiven a good sustained yield of brook trout over a period of years as a result of annual stocking of fry or f ingerling trouto Numerous la' es , not accessible by road and dependent on the stocking of fry and fingerling trout, have given good yields over a period of years. All fisheries field men are familiar with some lakes in this category. Need for Reducing Legal Sized Fish Plants • 1enever Possible If plants of lecal sized trout can be eliminated or reduced in some waters they can be increased in other vraters wi thout additional cost. The small 11 put and take 11 streams can handle many more lecal size f i sh than are norr available . eous Honever, in streams , i t mi ::; 1t be advantag- to increase size r ather than numbers of fish since it is la10 m that hatchery trout make a necli gi ble grmrth in the small accessible streams before they are caught. Di_fficulties to be overcome in Setti ng up A Tiro Inch Trout Stocking Program Two i nitial steps must be taken before a satisfactory progr am can be started. Hatchery facilities must be adjusted in order that suit- able numbers of two inch trout -rJill be available at t he proper time �- 6 (April, Uay or June) , and the sportsmen must be convinced of t he wisdom of the program. Lakes to b~ i nc l uded in this program must be evaluated uith reasonable accuracy. It can be expected that errors ,;;ill be made in the initial phases of the progr am but proper adjustments c an be made and experience gained initially ,;Jill greatly hel p in the event of expansion of the pr osram. It is sucgested tl1at the initia l stocking procr .:un be set up with assistance in the field from the Fede:.·al Ai d (fish) section~ Plans for Further Study The studies conducted at Parvin Lake are not applicable to all the 11 t ypes 11 o: lakes found in Colorado. Further experimental ,;rork is planned to determine the extent to .-1hich f ingerling trout can be advantageously used in the less p~oductive lakes , i.e. high elevation lakes, and f luctuating water level reservoir s . I t i s my opinion t l~at f i ngerling trout can be used to advantage in many lakes that will not be included i n the origi nal plan for use of fingerling trout but acti on should await further studyo Acknovrl edgements Data pr esented i n thi s report vras obtained from the nork accomplished at Parvin Lake under the supervision of Dwight E. Roberts in 1 950 and Harvey J. ' ."illiar;is in 1 951 0 Respectfully submitted: 1Y-/7 ,1~ . . .. . D. Klein . ~ Supt . of Fish Tiesearch �Leonard o. Fisk I nt roduoti on A lak.e s urvey was conducted on LonP-tree Leservoir from Ju n e 16 t o ·' eptember 12 , 1 J5 2 . 11h i s v,os a conti nuati (>n of e proj ect whic h was ~ta1ted June 15 , 1050 and whic h extended ov er the s ummer mon ths of 1950 and 1 ~51 . A li mit Pd amount of wo r k was also done duri n -; t h e wi nter m·rnt hs of l 'j5O -51 and l 'J51-52 . Lonetree .. es e rvo i .c i s l oca t i::d i n T. 4 n., h . 69 '• t Secs. 4 , 5 , 8 & 'j • It i s s i x mil es sou th'r',cst of Lovel and , i n Lari mer J o nty . I t i s accessible by one public an d two p r i vate roads . The reservoi r WR S oon st .ructod i n 1881 by t he Jonsol i datea ITom o ~upply Ditch J omoany for at')r "?O of i &ri ijati ~n wat8r . Physic a l Charocters LJ n et1 e o .ieservoir has a surfa c e area of 502 <:J.:n '"'s wh en full an d 250 a c res when dra i ned to t h e mi ni mum . r axi mum acp th i s 34 fee t with a capacity of J , 5 0 a c re fee t of ~•a ter . remai ni ~~ - 1 i n i mJJT1 depth i s r!ine fee t with 30C' RC- e fee t ~he main inl e t i s on t he north shore ana a s eoor•dary icl 0t is located ri t t ho n ol' t hwr,s t c orner . ·•he outl e t is a t the noi t hcast corner , a t the end of e 500 ya~d l on~ c hannel . �2 is a ei n.tle-depres si n l alr e with Lonetree -: o: ervoi ently sl pin sides e xcept i Theae ,_ ens contain when the lake is full . at e c otton 0 da , ill owa and ov ,be to j . v. a ~ X i n h _s f l uotua.te as n l Oh ernp e tu re ' ter sma ·twe d I.I Th e 1 k. e i s usu lly d :ca :vn do n fro nd f · 11 ..,a fror..1 There f l ooded wi th f ive t o ten fa t are seve al areas t h t a 0 t he outl et c b nnel . he wn t e ,Juno to ') otobe -l evel may d Y• nd .J hemi"al Characters The tempera t ure and c hemic al aharect ers • f i one t r ee : e a e -voir wo e qu it e v r i e iz aJ Tes t• eek a t t he jeep stat i on , and Bre ere maae o .c e eaoh SU!!llll t hr ni:sh ut t he sum,, ier . n T bl e I . 1 pera.t ~ ·e were t a l\ en f the a i r and ~f the ~=te1 f o~ the su f ~oc t o t ~e b ott m At f:, t i n terv 1:. l • ,;\he 'rhie wew done with a .res i ..:-tan o e t herm me t er . c e delimit e 10l i . e temperatu ·e drop pe on e f fo ot. aa h v i ng a mini um of 0 . 5~ • · Then t ond t ho wi dest ~as 15 feet . were a l wnys of i erent ' h e e t herm oolines id t hs and were loc tea a t different dep t be ~ fr m t t e surface t o t he b tt m. ~h ich proba pl ccounts for t l e ext reme v r i CR ethyl o An-e alk Rlin ity . ke duri n 1r oon tin - the summer , nd le Vi l'.! l ved ox yo- er., the Water u nl ly ente in Die ne - ilit . bon •. i oxi.t'I e , p or. olphthal ei n an r. d H were dP. te rm in d by t h e ~ des o i bed by La l er .1' me t lL L gle t Y.:a 1 ~ . l 4 J .. tudies i n re sh ater f i shery bi uaw rds Br os. , Inc., nn or , ··icb . 2 .... 6 pp . '! J . �3 On onl y one date , Septemb er 2, vas ther e over four p ~rts per ~i l lion of oxy ~en a t the bo tt 9= • This WP S sel - ect ed ae t h o i~i nimum amoun t for p1·oper f i sh habi t a t. 1'here w~s never , however , a s e rious depletion of oxr~en in t h e upper dtrata of w ter . werbon di~xido wns presen t nt t~e surface onl y t~ree t i. .es , but was always pres en t n t the bo tt om . rt "''19 never above 10 .5 ppm . ~t t he bottom , ~h iah ehould no t be taxic to the ani oal life i n the l ake . The a l ka U n ity was ol ways over 40 ppm ., which would pla ce t he water i n the hard class . The p B ran~ed from 7 . 0 to 7 . 6 at t he bo t tom and froM 7 . 2 to 8 . 6 Ht the su;i;·fo c e . 1'his is withi n t he tol ero.nc e of the dif ~erent species of fish fonnd in the l ake and wou ld not i ndic ate polluti ,n . qeoo hi dis c read i n~s wn re made with disc s paiY!. t ed black a nd whi te i n ;:i l terna te quarters . v a.ri r d :fro1:1 1 . 0 to 5 . o fe 11t . These rcad i n~e The reaul ts i Y!.d i ca ted that t he wa\ er is usually _at he1 turb id. Thi s was caused par- ti a lly by r l 7 ae a~d b.9 euspen,1,-.a mat t e frol'!l the wat er enterin ~ the lake . Ai r tempera t res wore reco rded dai l y fror.1 a maximum1!1i n i mum t h e rmometer . eve-a,7 e of 37 .s 0 ~, . 0f 84 • 8 °b 1 • 'rho lowest rendi g was 4 1 )~, . with an The h i ~h was 1 o°F. with a n av erage �Tabl e I . - TetnDerature and Chemical Testa Results., Lonetre R ervoir., 1Q5?. Test Secchi D th o 17 3. 7' Temperature Air 8 .o 87. 0 Bl. O 67.0 77.7 94.5 80. 0 78 . 5 74.o 8?. 9 85. 2 68 . 5 81.0 Surface 7h.o 74.1 1u.2 70.5 72. 0 75. ? 70~7 76.8 69 . 0 73. 5 71 .4 68 06 70.3 Bottom 5L.o c;4. 2 5h., 55.o 56. 2 56. 7 51., 56. ~o ., 64.S 6.7 61 . 0 (-i4 . 0 6 Thermoeli ne* 2 2 ? 2 1 2 ? 1 ? 5 3 Oxy en CO 2 ph-th Surfao 4 ppm. Bottom 8. 6 3.8 2?' 19' o.o o.5 T o.o o.o o.o l 2.5 2,, 7. 9 20 1 8.5 1 I o. 6 13' ' 6. 5 7.4 1. 2 6.8 ?.? 8. o 7. 0 0. 3 0.1 - 14' 1, 1 1.8 161 o.a 15' lh t 2.1 6. 0 o.o o.o o.o o.o o.o O. fl J. , o.o Surfac T 6. o Sur ace o.o o.o o.o .o o.o o.o o.o o.o 6.o o.o 6. o o.o o.o o.o o.o o.o 0 . () o.o o.o o.o o. o.o o.o o.o s2.o 5o.o 49 . 0 47.5 53. 0 h7. 5 ,3.5 J8 . o 41. 5 !tl. O 54.o 50.5 51.5 Surf ce Bottom pH 1. 1 Bottom Bottom 110 8. 6 8. J Surface ottorn 9. 0 10. 0 10. 5 s.o 7.8 10. , s.; 7.5 o.o 5.5 o.o J.5 1. 5 69.5 56.5 67. 0 81 . o 76. o 44.5 74.5 69. 0 69. 0 63. 5 59. 0 1. 2 7. 1. 1 1. 6 Depth 29 ' 31' {~ Indicat e number of thermoclines 7. 7 7. 6 1. 1 7.6 7. 6 7. 6 7.5 29' 29' ~6• ?6• resent. 3.0 ,o., 48 . 2 .4 7. 6 7. ?. 8. S 8.1 1. ?. 7.4 .6 7. 3 1.6 1• .3 7. i 1.0 24' 2.1• ?Qt lo' 161 15' 15 1 1.1 �5 Bi ologioa l Chnr eoter s Lone t ~ee Res ervoi r i e quit e devoi d of r i ~ ·er nq ue t io v e~etr. ti on and cover after the ~•ater hns rei:in a rnwn down ab out ci ~ht ~ee t . ':'he o-vner • of the l a Le v:ill r.ot pe ..:mi t brush s hel t ers or «-Y'.Y ot1- ei c ov er to re nleo ed i c thA Thi s .resul t s i n a po o.r l e~e . h~bitat , especial l y s i n c e there ere no hi di n~ pl eoes for the youn~ - of-t he - ye9r ~nm e f i ehes . Th i s a l so l i mi ts the numrer and 1:i nd of ,quat io i nseo ts . T'lonkto~ on □r l os ,0 .r e token at f i ve stat i •JP.s ir. the 1 l ake 1.5 t i ·es du.dr:"' t he snMMer .. "our of the stqt i or.s ,, a!e neaJ.· sl.o.Le, nd th e fi f t h woo at the ae ep sta.t j on where the o homioal 1..ests were mad e . ,ehi s w&s aor1 e b y tqK i ng o ve.ctical h,1ul f:.·011 the hi)tt o1.. . 11 1:a dnte , s t a tion n.uu.ber . t1nd uepth we.ie pl c c"'d on n tn," ir· the v i fll \"'i th the plnz,.kto1 , •:.'hi c h 'Vr s tl1 eri 1>.reee:cved r•i th foL·mal in . ,eve.1:n l ul •;al blo::,ms I e ·e n .) ted in ~u.mrn t . with t1,e dom- i nant spec i as bci n~ Aphaniz')mnn on ~2 • :'hese snr.iplee wil 1 be s tud i ed at a l Pter dat e . 3o t t om sar:ipl co were td:en In nddi~i on , on t ~e shoie . sa□pl ns The ~e drouned one foo t. 1;. t the deep t; tntj on 1::3 timAs . ~·• ore to.ken 1 6 times at f o·tr :.3ta ti :rns ere t:ikcn each t i r.10 he l 0 ke l 11vel t e~c h ~t ~t j >n a eauerP. foo t sampl e ~,as ta.kcln at t h e water' s adQ"o nn d ano t ae_ sa mpl e 1•rn.s t al-:en one ver tioal foo t up the shore from t ~e w ter s ed~o . 1 The pu.c'!')':ls e 0f t hi s pr0 c edure i s t o t ry to de t e1 mine i f t he insec t fauna mi ~r~te as tho wA t er l ev el ~one down . These s nmP l es r .e c urrentl y oei n~ a na l ysed . �6 Fish Coll e ot ad Fi sh we~e co l l ected th1o u~hout t he summer by oenns of -~ i l l 11 n ci fyke nets , sein es , ar.d hJ oL and li ne . The f" ill n ets r an~cd in s l ze fro~ : -to 2¼ -inoh bar measure mesh . The strai~rt mesh net s weLe l ~O feot lo n deep . by five fee t The experi ment a l g il l nets \, ere 1 25 feet lorn by f i ve f e et deep . '.i.1h e soo tio na i n these note worn 1~ -, 1½-, an d 2-inoh bar moasure mesh . :-1 1- • mre fyKe rets wer e 12 ..:eot l on~ by f o r feet in diar.iet ( r \' i th 1 - an d l; -in ch bar measure mesh . a om.~10n serco , The seines used were 10 - and 2O - f)o t .,o - end 125-foot st:s:ai7ht knotted • and 56 - nn<.1 2C O- foo t knot ted ba.i; soi neo . ta..: en ,y ·~ill and 'i1 e hl e II t~i ves tre number of fis r fyke Y! ':3 tS , tile si 7,e .. an ~e . ~rd the sex xntio . The :: ex 1atio 1,1cl11dea soir.e fish t oi:.en by aeincs !W 1 t'".)o.· end lire . The number of fish taken by trese L,ct Bent ion ea are r1 o t tac ,1l ated . 'i'he mp,io1 ity of fish t-ken ny so i n i ~q; \, are yo ng of th .a y ea.1.· cord ua . iothods r.a on l y the total nurnl.Je.r \•·-, a : . - e - A .cepresentativo 3 mpl e was kep t pnd put in ,j tJ.rs contair. i t!½ 10 per c en t forrJ nl i r! . 3ei ces I e..:-e ue ~d LJ ti ue e auri1. 's t t e s u mmer. J ill nets were set <1 S fol lo• s : l '' , 41 timer- : 1..J ri , 11 ti .es; l ~ ', 44 ti es ; 2'', 37 ti ' es : 2}'' • 37 ti ~~es ; sr. d expe.dmerital, 40 ti es . Tho n r t s were i r t1ie .,.,,,tor nn av eJ.P•?e of ao 1:ot'l.rs per ,_et. fish per n e t per hour . This ,,.ve 1 resul t Jf 0 . 73 Fyke n ote were e~t 73 ti 1 Ps , a lso with nn ~~era~e of 2 0 ho 1 rs per set. o f 0. 47 fish per net per hour . Thi s 7 nve r C"t ch �7 ..rill and ";lyke ra t C. to hes nr.d ~ex :::ati o of r.~ i sh Tak en t Lonet ee i.e ervoi.1 . 7 u.I!e 16 1e te b r 12 , 1J52 . Table I I . -;;,-- e l-.a ti o Le Sp (30 ~cs or· . 3 . 0 - 1 .... . o l . 0 - 10 . 8 8 . 7 - 17 . 0 ., - 1.) . 4 6 .~- 9. -5 .6 .3 . 4 .1 6 . C-1 :, . 5 6 . :J - 12 .o .., . 2 -1e . r Yell ow Perc h Bl c :- C ·ap ni e .t hi te "! rappi e ,a i nb lrout Cutthi:oat T· out La .cP'e1· o th B s Blu ~il l 0 an e- not ed : J~ f·i s . 1/ 1 0 ' 0 < 19 1 7 41,... .:, 0 et:l te n Lite llO. 01· 'es tern 1., ong-n or; 0 9uok er a.rp r i ner 4 ?4. 2J j30 l vl 5 .1- 7. 7 c..'2 1 ?he fish o ~u 1rht f me eithe ' i e t e 'ti the ,aas to ~ pe tion .L8 El s.lc.s ')f 'F du " lst t t · e -,on· d • site • body b eloi; s ~ 1. . teJ:al line of tho ();:i 4 1 (\ • <) ~J 30 57 18 5 681 48 136 ---9(' 95 to a stpr:aa ap oe re ei~-- t ted ill r:.;ms . e e t l:e~ a 0 1i th co J) s c ale ren cut o-pen 1he fi h •·vo nd tte sex deter i~ed by i.M - fin. ar t of the b y 0 t J} 'hese • ere ta}:en fxorn bel o the hen t r 1 e f.ror.1 0 i de piny - :coy ed f shes , ? rd f.com ,...bov e the the t>i 20 4f 81 time of spr: rdo~ . e.:.e :, Cales the do ... s l L ter 1 li . e 300 50 7 l mRde of the bod~ cavi t y pn d t .e externnl for p 3 The condition of the . , :> ads,; s to aetei- in e th o_a ., 4· l · 1 d. 0 ·: cl ounc eo . A h 89 5 t ) t 1 l enP:th w~ ... aete ·cir:. cd '·i h t· e asu.1.·ir.g n -p"u.nc1 adaa t o ere subiect e, 1e f a ·~4-inc n ai 'I' ements .. l.l. 1E3 t7 554 8 f t - rav d fishes . pl c ed i n o oin nnvelJp s n ~h e les "ere hich ~ s rnco rded t .e snec e. , a do nur:ibe , len,. t h , we i n:h t nd sex of t he fi h m~d the dote . 'on .i i .Jl'.! p,.. !Site t eea en e l f t c "' Or:aa e • en St; ~c h snmp l es ··e1c 1 '1 eo orried on ·e ·o t kec t'r , sl ~-Indicates r.ur.1ber of r._1ales pP.c H 'O fe r.ia li?s fish �8 whioh oontainod food . These were wr,pped in cheesocl1th ,l ong with t he o o i" numcer lf t , e f is h conta i n i n? 10 per oont formnlir. . 1111d pl r o od in .iars The yell ow Peroh 1:1tomF1a hs Fre currently bei .g Gna lys ed . ~his study will extend from ~une, 1J50 to Jeo e~ber , 1~52. ~he otr er stom~ohs will be WOJ:kod on "lt a f•1tt1re d~t.e . Yell>w perc h sol os 8! 8 curre~t1, beir; • ea . 7 This is f.l oon tinuat ion of a studJ m"de by _.ex ,·all i n:'crro for 1 ~50 - 51. " onles from the t ~er speoi ea DL fish "ill be fi~ od nt " 1 tor dote . Pn:=-::is i tcs we!' O observed fr!:>m _ovo.lnl s-pecies 01' fjsh . Li~ula irtestinali 0 , a 11 rv ~l cestode , r·s ford in th~ b~dy c·vity 01 r!ine yellot·• pore r N!d 13 ve terri A ~emetode, 1,i~ 11 !l!!.:! ~~cl3nh luc , we.a :) " S •,l ite 2u.okr-rs . 1 1ved pr0tr•din"" fr~m t~c a rne of tn1 white c rnpp i ~ ond f~om ~5 blnot crap~i(l . 'i'hoso to ore rcoo =dcd fr;,~ tre bl.,o. o. Clpni e orly f1or1 ue;ust 6 Soptm-;bor 12 , , 1 t hoa~h t '- ey wc:re moro nuoero •e du.ri ng tho firs t hqlf 0 f tre surr.mer . •n unidentified r.cmstoda ~as observed if' tho bbdy c avity of ~no lflriz: er.iouth b o ss r.- d three 'block ore ppi P. . blac v rub was ,>'b'1ervod 011 u western •<r1 t e sue er tnken ·epta~beL 11. Spn,•mi n~ d3t "'S i n :.1r.,.troe _ e crvoj r •• ere ob:.:-erved as -f:>llowe : yell')W pore , thro·1 gho >t •pril : bl..,c!: o.n-pni"' , mid-,Tul y : woetern whi te sucker , mid - 1!ay : WNJtern '?'Olden seiner , th10 rrout .Jul y : os.rp , tr.1.ou~ho•1t Tuly : bluetill , f:tom l ate June to l ate flu 7 UJt . ·,he spoN1 i n~ ds tes o: tre o ther speoi~s >f f ish we1e ~ot deternined . �.' 9 .;.,eco ir.1 cn~ a t i on s Gi l l ard fyk.e n et s .res 11lts i rJic te a l a.1P-e nonul a t i rn 1 of yel l o w p e r c h ~na b l a ck cL~pn i e i n t he l ake . a t t emp t s i nJ ic ate a l e~·ei p opul a tion 0f •H~ d b l u e~ i l l t han s h own Jpi•p t o .o r atn e.1. nume ... ous L I t i s iol t ti t ! t i t! ·L'ab le II . l a r~cmou t h bnts wer e a l a':) f ound ce1 t q in part s of t h e l a. e by soi n imr, . , oo ~sui)n a l us e o:f a s h rn e.L WO" ld h -~ l p to det ermi ne t h e .L·el at i ve nbun :i .. n..:': of t he d i fferen t apec i As . ~ev eral pro bl ems h a v e b e an stR 1 t ·d or c oon l o~cd t o d• t.e . 'l1 h e!:!e i ri cln.oe t he foad hrr,j t s of C hrn . b1 A O }: ornu n i e a n d yellow peror , s~nwn i ~~ dH·cs ot the fish~s . pl u nkton " co"ipl '1ti m nn ~J.ys i s Hr. a b::> t t)Cl et>mPl e studlcs . u l an} ton Bnh l ys i s >.:." i:rc nd l,J t to·n snnr-1 11 ntudy , to a:cithn.1 "itl'.1 food habit 8 t l1d i es 1f srivor a l othe r s-pr;;c i es of fieh , !:iuoh •S the SUOLA_ e , l srv1 mo th RF~ •na ~l u.v ill , vuy i rd i c~te i· o1rc i ntcr_el:·i; i 1oa'line t,et·•een t flG fo)IJ 1-:!'~ i t~ • r.a the f oo d o r-::an i sms pl'e.:rnnt , arid of tre de.o:1·Ae of o omT'c t i t i •Jn vhi c h o:c:i~ts 11 ~ t · ~ !! tr.c !.ij f 1' e . o • t !'o _e ar.;tn il ec1 st 1 •j 0 s ~•ho 1 ..1c sno 1"r- i n,~ .-.;:,, ·or,s to d,=>1·0 mir!q ~-1,..e: S f l l ' h; 1 1e "'O')d i:i 1 ·:117 -:r.d l J.~ b1!t •'I •--g . Gl nuri !"'i; the ,JJJ 1 -,·1s ~:re t o re•, b )tr nhys l ~n l and ·frer.1i ":}~l , i cfl uen.J, !·ep.L odtJ'1 t i )!'1 . '"!.l m~ j The perch repro1>1 c t ion 8 poo.r ir. 1 J~8 . i"le ... c Clo. e nur.rnro.1n i:i 1 J5:~ t hnn i n ei ther l :150 Rl a ok oronn i e n· 1J51 . I"any of t he~e vu:i_o f.L om fou.1.: t.o f i ve i ~o'-:1::i in lcn .. t h . n~ne-entl y l e· t YAR ·' a a ron . f oll.:> , r.d •.:n e These a~ ~roups sho lld b~ a fo..c s veral more ye·•u:1 . �J.O 'l'here i e al! a cute sbor t !l>{O nf mi 11n')i;1s i r. the l akP. . ~ee tern golden ahi ets are the onl y srnc i es Pl~ cnt in s i ~nifi cant numbe s , but nJne h~v e been i den tifi nd r.s y, t from the stomachs of 8ith er perc h or crPpni e . It i s ~alt that the i ct .c oauc ti oz, of moLe forp .e fish ir1to th e l al-:e mt>y inorerso t~e food surnl y , e~peo i Pl l y aur i n~ the snrin~ . 'Pho Zv the Hcl mi no\ may f ill this ne od ••s it i s u s ed quite cx te~siv el y by t Le pe.£·c l in ,Toc-:.__s on J,ake . Lis t of ·'ishes .. nown t'J )o.Ju..r i n ror!et.L·oe .. nsr,1vo i.r ..air.bow trout . . • . . . . . 1f1lrn:.> ~a i rdneri Cut t h .c oat t.cout . . . . . . . ·Rlm\) ol a.rk i Ln.n er::ioLtth bass . . . . . . . . :10 ronterue s almo: d ea leliow perch . . . . . . . • Perea · f l a.vesoens BlP C~ cr~pp i r . . . . . . • . Pomoxi s niQromaoul ~tus h i t e ornpp i e . . . • . . . • 1 omoxi e arinula r is ror t hcrn bluetil l . • . . . . IoP0mi~ m. mncro chi ius J ... Qn;i;espo t tod SL<ntish • • • • Lernmi s hurnilie }.L·c-,m sunf: s:ti • • • • • • • • r t:!pomi e oyenelluE" laBt erc. white sucker • • • . Jptost'>tnlls c omrnereon i auo1<. l ey i 9es tern lJC C'o:c SUCAAr . . . Oetost>rnus cnto~tomue ~ri □ eus Carp . •• a • • • • • • • • CypLinue carpio 1 es te.1n ~ol len shi r P.1· • • • • roter1i,,.or 1 rn orjr ~o lcucf's uur13 t us ...? l ains san d shi re1 • . . . . l otropis clelicint1us misf·nr i,ms is llln i na .1.·,3d shin e.:. • • • • • • f otr?pis l. 1u t1ct"si e Veatern bi~~outh mi rnow . . . l otropis dorPel i niPt~I~nie I orthern oomm .m s}·ir!Al' • . • rotron i s C')rr.utus ~rontalis f.or t be_·n oraf>k c hub • • • • • ,acotilus s;;t10maoul,:itus I o~~ dnitnr . . . . • . . . . thoos t nm~ exile 0 ('< . Johnny d11i-tex . • • • • • • • ' thPos t Jl!lt=i n. r!i ~run rJ en trpJ plains ~il l i f i !:'h • . 1 undul us knnea o �II!o Objectives To deter ;w,c t.he off ''Jt n:f Carp Pcrpul.e.tions on the Sur- ·J"ival Ra.ta of Yellow Perch~ IVo Introductiom In pc1.st yearc, ltl-:"ge mun'!:,ere of yellow perch try h.avo been stocked 1n i:i.any \7at.ers in tho Arkansas Va11ey, yet surv:i.val of tho so fish has beer1 indiccernitlA. L.,ree m:mi'a.,ers of adult fish of this species have also been stocrced in the na.rre watP.rs., and although the adu.lts apparently survive, no evidnr.co ot rcpr·,duct,ion has bee.n observed. There i s one exception to the l:1st statement, ns ,:,eproduction of yollow perch hns ()C- eu."M:"ecl at Tuo Eut,tes ReseJ"'lro:ii- ln 1"3aca County. It is believed howover . that this 1'eprcc':,1ct:lon ru-:e been limited, as tho species has not become very a.bundnnt in this :1.mpounclment. It is believed that largo carp po1Julations proscmt in the waters - whero yellovr perch fry hav,a bean stoekod are partly responaible for their failur0 to sui"Viveo In Two Buttes Reservoir the carp population is mt lm-go, and the s'..lI'V-lval rate of perch is higher than in other waters in the Arkans~a VallEl"'Jo Therefore, in order to detm·mine whe1,her or not laree carp populations contribute to the failure of small yallmr perch to survive, and to the lack of roproduction fr0m adult f-tsh of the same species., an axperiment is beinc c ..:mducted at the Two Buttes Rearing Pondso Vo Work Plan: There aro two ponds at -'i;his etr.tion, the upper pond consisting of about 1-1/h ~er.es, with an ~vcrace di::,pth of. 2-l/2 foot.c This pond will be the experiM!mtciJ.. pond., The lower p<md has an ti'l'ea of about one acre rrlth an aver~eo dai;th o:f 2-1/4 fact a.Tld will be the cont.rol pondo 600 Yello,1 pm·~h were e<!l·,r?J.l:t divided between these pondso weieht» and number of fish nrn listed bcl.ow: 154 fish aveo 6-J/4 11 in leneth at 129 31'7 11 fl 5-1/2 11 rt' !I " 7 fish per pound 20" r!" u " 5u 1t n rr 2_3 U II T11e size, 11 600 carp ,-:ere placed in the expol'"incntal pond 1,ith t}e 300 peI'chq Toe size, weight ar..d nu1I1bor of carp are listed below., 21 fish aveo 14 n 1h4 " ft h22 " n " averace3 pounc!s ff 2 11 11 lo07 " tt lµ. II O �T~1e Ji.lo yc~Jc-,r ~Jc--ch ; n ·i;.h" ~ JP3·.::- ,1 ~YJ1ld w:Ul probably sp,lwn and as a by-pro .?·..1ct, or ".:,ho o:x_µn .'irl?!l"t r~ n.l!.l1'e:..• Jf f:.7 'Rill be e.vaila'bls for etockirigo Yel.1.t,w pereh W(•rc plH.eod ·t.r, -tr-.c !Ylndfl on ?farch 211 19~.. Carp w0.:ro p).-;e€:d in ·~ho pomfa on H~h 30 1 19,'l... �n Uea s ~ ot m,uy !3ftllllage Osnal.• Dste1 JtilV T, 1,Ja Inwstiptoro to 1. Jquh1 ftsh Teolmieiea xv. tntNttu.oUont ~. CJ.ell fUSh of Holly,. Co1nado NqUeated• ~ ~. Itoy UOklee• Oeald~ of Dlsuin "• Ulat the dn!nese dlteb looale4 one-halt mile ueat ot atUv, lolon.do1 be av~. A ~ oE Rinbov tloat ~ - l'VO 8'llt.ee ~ .dV1n$ ttm ht.sh waw peri.od ot 19'1 entt made thetr uav up this dra!.nage canal. These fish vo:re abGut 8 • 9 11.mbes last ,ear, hOli8'VGP this epdng a numbe1' ot 12 • lb in& fish were aaqht 0$ Gt the canal by 1ooal ftehersia.o S~Q 4 he clla!.ttamG osna1 eatentls abo1lt, '1iO a'liles norbh of the Aaa.nsae m.wr, thm abotl~ ac.wen m l l ~ fltO a•enae 111.dtb ts mne feet. Wh9 average depth ia alDoat tw tee~ \11th ma1W deepev peo-le ~ the GO\lftle of the oanal. i1te nvth ua ie 1oaatetl ~ mile . - et toUh, lo tu uaw is sappl!ed bom ieGF888 or lf10uad vater tdrlcm ftowe at. a tauly steaq ,m,aatue. fhe flow vae eat4mate4 at, 1-1/2 secad feet,. fhe now wmatns steatt, tttro~hout 'Iha ~,_and•~ .fftnes cltW1ng ~J! mater. QnQ11d vater in 01.e uea ~ J'J.aee a,._. 65" r. ;a. Ohmmel catfish "1Gm 9 to 22 lnohes in lenoth were fO\lr1d in the oana1. and , . wu,e '997 al>undmt. 6\h&r 8.eb• sw,h ae, QQ!Jlltack Suekers, Green S'Dftsh, Westen ffld.t9 Suckers, oat,> and swenl speotes of minnows tee tt111:td to be present. fl. Plant ~ both algae am htflher plants, ie VQ? abUl!timt. All fl.ah takon. wen ta eaceUent, condl ti.a. s. It 10 evident, aurtns 1W ate, peiods ot 1tJe rtnr; that most ot ,ha ft sh numall,r contained tn lhe r1wr canal, eoek mcetuge in a ntllnber et dlnd.nage canals a1CJll the oovse of the nwr. fte Koll¥ dratnat1e osaa11s ~ypioal of sub etmalso Beeommeadatlomea In geneal cb'aimse canals ewer eadl small al!'eQs, tbV ee ead.17 .fished out. ~ , the 1bl1J' ctraiUIJe aaaai, ~ e ~ eatenmve arms to a total leDPh ot ldne mt.lea ooald not be readllT fished 0\1\o I h a ~ tlxre& ml.lea ~ \h9 cena1. coald \le st,ookecl with tJtout, ,.,... Vided that, the fish ue,e plated at ante ot a few tor ove171f1,0 et a mile. fhlo lwer uea wotlld pmbabl.V l'emr4n epen to publla tiehina, hotsGVer the upp,r avms pass through tum land ~ e p'lblie fiehiug might, not; be aUowed. • �fi_)(Jtv Ii\) Sf":J..ttt\ Title: Population Census, Harvey Gap Reservoir Date: August 22, 1952 Personnel: Tom Lynah, Dave Lemons, EI'nest Strieter anq. George Steele Introduction: Various Sportsmen in the locale of Harvey Gap Reservoir have for some time had mixed opinions as to the type of fish which should be stocked in this body of wutero No survey was made by the Department before this summer of 1950, therefore a number of mixed warm water and cold water fish species have been stocked in this Reservoir. In the summer of 1950, Dick Klein and Tom Lynch conducted an elementary survey of the water, and decided that it was a cold water lake type. How- ever, &inoe that time a number of requests from the Sportsmen of that area have been made of the Department to stock warm water fish species at Harvey Gap. The prinary purpose for the present census was to determine what fish species the Reservoir was best suited for. Reservoir D~scription: Harvey Gap Reservoir, 1s located in a small side valley off the main Colorado River Valley about ~our miles north or Silt, Colorado. At high water level the Reservoir contains a surface area of about 200 acres with a maximum depth of 60 feet. At low water level the Reservoir contains an area of 8 or 10 surface acres with a maximum depth or 10 feet. The primary purpose::· of the Reservoir is irrigation and each year a gradual water draw-down occurs from a maxinnnn depth of 60 �-2feet to a depth of 10 feet. In.flow is from Rifle Creek by ditch to the Reservoir, outflow is by ditch to farm lands below the Reservoir in the Colorado River Valley. The Reservoir is filled during the winter and spring months and emptyed during the summer. Aquatic vegetation such as Myripphyllum and Chara are rather abundant on the lake bottomo ~otamogeto~ .§E.• are .~esent but not abundant. Su.nm~. : 1. 'rte c.1:..-- temperature on· August 14, 1952 was 83°F., the surface temperature of the Reservoir was 73°F., at 6 feet it was 70°F.~ as it was at 12 feet deep. For 18 feet it was 69°F • ., mica~.~ feet deep it was 66°F., while on the bottom at a 30 feet dppth it was 6o°F. ~· 2. Fish taken in gillnets on August 14 and 15, includod: 5-Brown trout, 13 to 22 inches in length 31-Rainbow trout, j- to 12 inches in length 211-Yellow perch, 4 to 8 inches in length 3-\•;o w. Suckers., 12 to 14 inches 1n length A 24 hour, set was made with 300 feet of 3/4 inch mesh gill net, 500 feet or 1 inch mesh, 300 reet of experimental net which has mesh sizes as follows: 3/4, l¼, 1½, 2 and 3 inch Scale samples was taken from l.~2 Yellow Perch, 3 • Suckers and the 5 Brown trout. The shore line was seined with a small minnow seine and 21 Yellow Perch which averaged 2 inches in length were collected. �-330 Five seine hauls were made with the large salvage seine, 900 X 30 X 3/4 and l inch mesho Four bays in the north end of the Reservoir were seined, Several hundred Rainbow trout were caught, counted and returned to the watero Several thousand Yellow Perch were caught, weighed and counted and removed to Gould Reservoir, Montrose County, Colorado. 4o All members of the crew fished with hook and line at various ti:·::0s during the week while at the Reservoir. Bait such as worms and grasshoppers were best, however several trout were taken on artificial lureso Yellow Perch slightly out-numbered the trout taken while the crew was fishingo 5o The Brown trout taken in the gill net appear to be about five years old. The Yellow Perch in the 5o.O to 5.6 size group appear to be Just 2 years of ageo Yellow Perch in the 600 to 605 inch size group appear to b~ 3 years of age; and those from 7oO to 7 • 5 inches a.ppea.~\·: to be about !~ years oldo These Yellow Perch are growing slower than these fish do in other ·waters ·of the State. 6" Tho water temperatures in Harvey Gap Reservoir, probably do not warm up fast enough nor stay warm enough for a long enough period to provide an ideal habitat for warm water rish species. �-4Management Recommendations: lo Harvey Gap more nearly approaches the cold water lake type, therefore it should be considered and used as sucho 2o The Yellow Perch population,,"although they do furnish some fishery value, s_l;l.ould be removed as they are in diroct competition with the trout for foodo Re- moval could possibly be undertaken during the low water periodct 3o Some type of £orage fish species, other than suckers, should be stocked in the Reservoir9 A planoton feedeta such as the Fathead Minnow, {Pimephales Erom~la:s) should be used. 4. Some consideration m·ight be given to this body of water in regard to establishing a full-spawner rearing lake as some conditions approach those of Delaney-Butte Reservoir near Walden, Colorado. Respectfully Submitted: Tom Lynch, Supto WoW# Fish �li'AVO::--',ABLl~ nr~mJL'rs r.-no:1 PL\UTS OF TiiO II!CE 'i'ROUI' III P?, EXPZ:::!HFJTT!',.L LAKE W. D. YJ.ein Colorado Gm:1e e.nd Fich Dera::.·traent D;:;;nve1•, CoJ.o:c&.clo In roc~nt y,x:~rs the Colorac1o Go.r:-:;;: and Fish Bepartn:ent r,tepped u:p its production of creel-::; i:'.e trout in o.n effod; to l~eep ps,ce with inc1·easea. fisll:!n,'."s !Jressnre. Equitable dist:!.'ibut.ion ilmnc:d:i.e.tcly becmae a problem, rmc1 a system ,m.s devised which evenly allott.ecl the large f1sh on an acre2.ce basis to all suibble tr·otrl:, Wc~.ter.3 e.ccc:,wible by ro:i.cl and open tc free pu'ulic Cons :idan::~-.tion \r..:.o also given to ot.he:c readily 8.)l">9.:cent- r,1i ti/}J.ting fish:lu;:;. fa.cto!"'s, such 2.s f:i.shinz presnure. Hrn-rever, the b:i.olo0 icc.l st.a tun of the variow lic:.tc:-s W!li~ nccessari1;y given sc,'.nt cc.ns ider2.tion in this initial dis- It. s2emec1. lH::.2ly th.3.t som8 o? the water·s, :x:!..rticulc::.rly the mo:re p!'otluctive tro"J.t 1J.:-:es, could :pr0duce satir.ifactory fishi!iJ tmder a stcc!dn;; pro::;r.o,n us j_n.::-; .fin~~'=·,:linc; t.rnut inste~c1. of' creel -s :Ize f'inh. Ex:per:ir::ents W8re ini tia,tec1 at Parvin Lab.=, a sixty-t1ro a.c:re "good" t:i;out l&ke, to c:or:1::;2.re :cchu:ns from r.:.:J.rl:ed rln.nts of creel-size and two-inch raJnbo·,r size trout.. J?om:· ce::::c,r2,te plt!.nts of jmr--ta,sc;ed :ce.inbow trout ,,ere m.-?,d.e j_n 1950, with one r1lc.nt be:i.nc; u:'.de in euch of the following r.onths : Janm.ry, l,;-J.rch, June aml July. The a;reru.z;.! Ea.ch pln.n-~ con.:..isted of approximtely 500 fish. r-cturn to the crc-.'=l frcm th.':! fov.~ l)le.uts of taz;:;ed trout oyer a three yc2r period 1 e~r:1'.n.L.'1ted ·to ·r9.9 p-8r cent. - ......... -... -· - -· -- ~- -... -· .,. ~. .. Tc\~bss otud.-tes rr..::1da it possible to establish l'.. com- �,t 2 - / Fingerling rainbow trout, as close to two inches in length as the hatcheries could provide, were used in two experimental pl:•.nts. Approxilr.a.tely one- third of the total number of fish in each exper::l.r.1ental plant l-ras m1rked by removing two fins. One plant was mn.de in ?,hy or 1950, at the rate of 500 fish per surface acre, or 31,COO trout. ,. Three year returno to the creel from the marked fish in the 1950 plant a.moun-ted to !~9.9 per cent (l~,987 fish) of the total (10 1 000) marked fish planted. In April of 1951, a r.lt:l.rked plant of 62,000 two-inch rainbow· trout was made in the lake. Returns to the creel of 19.3 per cent (3,850 fish) of the original 1951 plant o:? m'3.rl~ed fish were obtained over a two year period. Twenty • thousand of the 62,COO trout· planted were marked. The returns presented on two-inch rainbow trout are minimum figures. Additional returns are expected, and fin regeneration prevented recogn:l.tion of some of the :ma.rked fish. Comparative data. between the plants of creel-size e.nd two-inch trout is made available by epplyin3 the per cent of return to the creel inforrn..n.tion to the various plants of fish. Two inch • I 31,000 X 49.5,~ = 15,469 trout to the creel 62,000 X 19.3~~ • ll,9S6 trout to the creel Cr.eel-size ~-J!!3~ v'') . 13,950 X 84.4~ = 11,744 trout to the creel The creel-size plo.nt of 13,950 is a theoretical plc1nt based on the normal allotment of creel-size trout for a lake the size of Parvin, in e.ccordancc \ii th Colorado distribution 1)1.'actices. DJ,t.g. is not a·1ai10,ble on returns to the creel i'roLl an actt~g,l plo,nt of 13,95c, creel-size trout. However, it cnn be re:1c1ily ob;.;erved tr.LC1.t 1·eturns to the creel fron the two -i.nch t1·out com:::.:are �3 - , very· favorably w:tth the ret,urns th~.t could be expected from a full allotment of creel-size trout, to Parvin lake. The weight return d-:-1,t,.1 offers a strikin3 com:_Jarison: • Per cent wcdght caught of weight plo.nted ----4..--; Oltl. 5 Two-inch plant (500 per acre) Two-inch 'plant (lJOOO pe::i:~ acre) . Creel-size tac;ged ffah 912.3 148.1 Factors other than return to the creel de.ta are important. In 1951 e..nd 1952, the large JU9.jority of the fish enterin3 the catch came from plants of two-inch fish and nat,ura.l reproduction. The following pertinent information gives evidence tha.t the two-inch stocking :pro2,·ram and natural reproduction provided adequ:d:,e fishing under heo.vy fishing pres cure. Number of fisherm;1n days number of hours fished Catch per 1~.1n hour *Humber of trout chec1rnd *Avera~e size of trout chcc1~ed 1951 7,388 7;59!~· 3li,250 33,405 o.6h 21,Bco 8.8 1952 .0''"(2 24,000 8.7 *Includes ru1 insignificant nu.rober of trout other th~n rainbow. It wc.s cora:puted that 9,059 of the trout checked in 1952 we!"e wild fish. ~he. wild fish contribution to the catch was fir;ttrccl by applying knm1n percentage return to the creel data obtained frcm m.8.rked nnd ta::;ged :plants t, - a11propriate plants or hatchery--re9.red trout and subt1:'actinJ the rermltant :fit;ure from the total catch. The cost co:m:p-~risonG· are significant. fused on Colorado G1.rne and Fish Department feeding co3t chta only, the following COT!ll)ar:i.sons are given: y ~- .so A': $105.!1.Q ::> -1 62,000 trout, 320 per poU!'ld. 31,COO trout, 320 per pound 13,95c trout, 5 per potL~d , ,/, f) c.;?10 -.:--· $li71. 00 J.[., / ~ It is apr,arcnt th3,t the use of two--inch trout, e.t Parvin resulted in a very subst.an-tio.l s.:i:vin6 when cc m1~~rec1 to the cost of plc.ntin~ trout running 1 �h - • fiv-e ·to the pound. The use of two-•inch trou.-t in suitable :productive trout lakes in the pL~ce of creel-size fish not only results in a substantial monetary saving in 1;tocl;.ing the bodies o:c' water i11volYed, but permits the stocking of s.ddition~l- la.rge trout j_n waters ·where this procedttre offers the only hope of' p:rovidir13 adeqi.1-:ite fishil~g. basj.s. V V T'ne end result is better fishing on a smte-wide �Title: I~vestigation Of Prewitt Reservoir To Determine The Feasibility Of Increasing Its Water Level. Date: '· Febx,iary 28, 1953 . .; ~ . Investigators: Tom Lynch, Supt. Warm Wa~er~ Fisheries and Robert L. Evans, Fish Technician II. Introduction: -· •.... It has been suggested that the Colorado Game and Fish Department acquire some ... 1,000 acre feet 0 f water fr~ the transmountain diversion through Horsetooth Reser- voir at a cost of $1.00 to $1.50 per acre foot. This water would be used to stab- ilize the water level of Prewitt Reservoir. Considerable information has been obtained from the Sterling Reservoir and Irrigation Company which controls Prewitt Reservoir. This information should help to determine the feasibility of acquiring such additional waters . .. Several surveys have been made of Prewitt Reservoir when it was at low water. Information obtained from these surveys is given in the.following report. / ~ • Physical Characters: Pr~witt Reservoir is located 17 miles NNE of Brush, Colorado in Washington and· Logan Counties. The area of the reservoir at high:water is 2,575 surface acres and it has a capacity of 32,824 acre feet of water. When the reservoir is at low water approximately five feet of water remains in·the channel in front of the tubes and there are several small ponds of approximately 10 s~rface acres each left in the reservoir. The dam is 36 feet high and constructed of earth and concrete. The outlet consists of two concrete-lined tubes which drain water from near the bottom of th~ re~ervoir. The dates when the reservoir has been at•its lowest from 1945 through 1951 and the gauge readings at these times are shown in Table 1. The dates and acre feet of water in the reservoir before it was refilled, which represents the winter storage, also is shown. �.. -2- Table 1. - WATER STORAGE LEVELS AT PREWITT RESERVOIR .. :I '._/ Date of Low Water Acre Feet of Water Gauge Readings Date before Refill Acre Feet (Winter Storage) Sept. 29, 1945 12,400 18.2 1 Dec. 13, 1945 31,400 Sept. 10, 1946 3,360 10.1 1 Mar. 14, 1947 31,680 Sept. 27, 1947 12,110 18.0 1 Jan. 25, 1948 31,320 Sept. 27, 194S 7,510 14.5' May 20, 1949 29,060 3, 1949 13,520 18.9' Sept .. 16, 1950 3,910 10.8 1 SeEt• 1 1921 71990 14.9 / 'Y.:5 .1 ~ t)c)u Oct. April , 1950 May, 1951 30,240 21,870 The 1946 survey of Prewitt Reservoir showed that there was a four foot fill at the tubes. Therefore, the gauge readings given in Table 1 do not show the actual depth of water at the gauge station. Discussion: "" ~ On December 20, 1952 a report was received that the fish were dying in Prewitt Reservoir. Investigations conducted by Fish Technician Rex Taliaferro revealed that the cause of death was insufficient amounts of dissolved oxygen in the water to sus• ~ tain fish life. This occured in spite of the fact that water high in dissolved oxyge~ content had been coming into the reservoir since November 15, 1952. Prewitt Reservoir is divided into a number of basins; when the water is low, drainage between the basins is little or none. This low water coupled with a cover of ice evidently caused the basins not connected directly with the inlet to suffer a depletion in their dissolved oxygen content. On December 29th another check was made and the dissolved oxygen conte~t of the water was found to be improving. By January 6, 1953 there was sufficient dissolved oxygen present in the water to sustain fish life. �-.3Recommendations: It is recommended that no attempt be made to increase the.water level in Prewitt Reservoir. Since the reservoir contains several small basins instead of one large basin the addition of 1,000 acre feet of water would not increase the depth in any of these basins enough to prevent winter kill caused by lack of dissolved oxygen. / The addition of a thousand or so acre feet of water would merely increase the amount of. shallow areas present in the reservoir. Respectfully submitted, ~~/~ Robert L. Evans Fish Technician II y- �I. Title; Recommended Management Plan for Six Lakes II. Date: March 15, 195.3 III. Supt. of Warm Hater Fisheries - T. M. Lynch IV. Introduction: Six lakes were acquired, upon a lease basis, by the Department for the purpose of increasing the supply of pan-size game fish for stocking heavily fished public waters. The present carrying capacity and output of the two warm water fish hatchery-rearing units is limited. Further expansion of these units or the establishment of new units is not considered economically justifiable. The use of the six lakes to aid in supplying the current demand for fish should prove more economical than oftaining fish by other means. Based upon information regarding fish production in pounds per acre, these lakes should produce about 27 tons of fish per year. The tonnage might be increased through more intensive cultivation. Tremendous fishing pressure is exerted upon certain public fishing waters such as city lakes and children's ponds and the need for pansize fish for these waters is very great. The production of the six lakes should be used to stock such waters. Other waters where ga.."Ile fish populations have become depleted could also be restocked with fish from these lakes. The six lakes are not the most ideal for the application of fishery management practices, but some success can be attained by the use of modified management practices . The fish will have to be harvested by seining methods since there is no way to orain the lakes. Accumulated evidence indicates that the harvest by seining is most successful during �- 2 - the periods of early spring and late fall. Therefore, cropping should be planned for these periods. V. Recommended Hanagement The following four lakes s hould be used and managed as rearing waters where fish should be carried from the egg to pan-size and then harvested. These four uaters contain crappie, black bass, sunfish, bullheads, carp and suckers. The carp and suckers should be removed and forage species such as golden shiners or fathead minnows should be stocked. 1. Sherman Lake No . 1, 2 surface acres 2~ Independence Lake, 35 surface acres J. Butterworth Lal~e, 25 surface acres 4. Terry Lake, 400 surface acres. Sherman Lake No . 1, should be left as it is and used to procuce mixed sunfish species for stocking in children's ponds . Independence and Butteruorth Lakes should be thoroughly seined, then a fish toxicant should be used to remove all remaining fish. Brood fish of the desired species and sizes should be stocked in these l akes . The brood stock should be tagged so that they could be accounted for and returned to the lake after each harvest period. Independence Lake might be used to rear crappie only and Butterworth could be used to rear bass only. Terry Lake is by far the l argest rearing area, and could be utilized for rearing several species of fish such as cr_a ppie , bullheads, minnows and walleyes . Brood fish should be marked by tagging in order that they can be a ccounted for and returned to the lake after each harvest. �, " . - J Fertilizer should be added to both Independence and Butterworth Lakes upon an experi.Inental basis to determine if tonnage can be increased. Possibly Doctor Howard Tanner might be interested in carrying out such an experiment. Sherman Lake No. 2, JO surface acres, should be used as a storage lake. Thlergency need for pan-size fish is always prevalent, however obtaining them quickly is often impossible. Therefore if a number were kept on hand where they could be easily obtained this 9roblern 1-1ould be solved. Also this lake could be used as a collection point for brood stock. Clover Basin Lake, i s readily accessible to public use, and the lake could be open to public fishing. It is recommended that all of the present fish population be removed entirely by seining and use of a fish toxicant. Also the lake could be utilized as an experimental model for lake enviroP.mental improvement and r estocked for public fishing with several game fish species including trout. Proper management and use of these l akes should help the public to gain confidence in the department's activities. The utilization plan for each l ake should be thoroughly explained to the people of Colorado and the results of operations, whether successful or not should be made available for public knowledge. The operation and maintenance of these lakes should be conducted under the supervision of warm water fish management with the cooperation of other divisions within the department. � Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Aquatics Research Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource 1946-1953 Fish Research Reports Description An account of the resource Short reports from Colorado Game and Fish Dept. fish researchers.<br /><br />PRINT COPY: CPW Research Library, SH 222 .C6 C62 1946-1953<br /> <table width="497"> <tbody> <tr> <td width="299">TITLE</td> <td width="131">AUTHOR</td> <td width="67">DATE</td> </tr> <tr> <td width="299">1946-1947 Reports</td> <td width="131"></td> <td></td> </tr> <tr> <td width="299">Preliminary report on use of Derris Root in three small lakes</td> <td width="131">Hunter, Gilbert N.</td> <td>Sept 19, 1946</td> </tr> <tr> <td width="299">Use of Derris Root in fish management</td> <td width="131">Hunter, Gilbert N.</td> <td>Sept 20, 1946</td> </tr> <tr> <td width="299">Poisoning Thurston Lake - cost estimate</td> <td width="131">Klein, William D.</td> <td>June 1947</td> </tr> <tr> <td width="299">Preliminary report on use of Derris in Thatcher Pond</td> <td width="131">Hunter, Gilbert N.</td> <td>June 20, 2947</td> </tr> <tr> <td width="299">A survey and study program to improve fishing conditions of Meredith Lake</td> <td width="131">Hunter, Gilbert N.</td> <td>Aug 1-Oct 1, 1947</td> </tr> <tr> <td width="299">Fisheries research progress report, month of July, 1947</td> <td width="131">Hess, Ray H.</td> <td>August 5, 1947</td> </tr> <tr> <td width="299">The Program undertaken to improve fishing conditions at Thurston Lake, Lamar, Colorado, and the use of derris as part of this program</td> <td width="131">Lynch, Thomas M.</td> <td>Sept 2-30, 1947</td> </tr> <tr> <td width="299">Investigation of the ponds at Fort Lyon, Colorado</td> <td width="131">Hunter, Gilbert N.</td> <td>Sept 9, 1947</td> </tr> <tr> <td width="299">Fish tagging and trapping operations at Antero Reservoir</td> <td width="131">Seaman, Wayne R.</td> <td>Sept 17-Nov 7, 1947</td> </tr> <tr> <td width="299">The use of Derris in the Verheoff Pond</td> <td width="131">Hunter, Gilbert N.</td> <td>Sept 24, 1947</td> </tr> <tr> <td width="299">Final report on use of Derris in Thatcher Pond</td> <td width="131">Hunter, Gilbert N.</td> <td>Sept 26, 1947</td> </tr> <tr> <td width="299">The use of Derris in the Rogers Lake, Walsenburg, Colorado</td> <td width="131">Hunter, Gilbert N.</td> <td>Oct 24, 1947</td> </tr> <tr> <td width="299">The Use of the shocking device in the lower Arkansas Valley</td> <td width="131">Hess, Ray H.</td> <td>Nov 13, 1947</td> </tr> <tr> <td width="299">Fisheries research progress report, November, 1947</td> <td width="131">Hess, Ray H.</td> <td>Dec 1, 1947</td> </tr> <tr> <td width="299">Results of shocking fish in the lower Big Thompson River</td> <td width="131">Klein, William D.</td> <td>Dec 2-3, 1947</td> </tr> <tr> <td width="299">Results of shocking fish on North Fork of the Cache La Poudre River below Seaman Reservoir</td> <td width="131">Klein, William D.</td> <td>Dec 4, 1947</td> </tr> <tr> <td width="299">Results of shocking fish in the lower Cache la Poudre River</td> <td width="131">Klein, William D.</td> <td>Dec 4-5, 1947</td> </tr> <tr> <td width="299">Progress report, North Fork of the South Platte, multiple purpose project, 1947</td> <td width="131">Klein, William D.</td> <td>Dec 5, 1947</td> </tr> <tr> <td width="299">Results of shocking fish in lower Bear Creek</td> <td width="131">Klein, William D.</td> <td>Dec 8, 1947</td> </tr> <tr> <td width="299">Results of shocking fish in lower Clear Creek</td> <td width="131">Klein, William D.</td> <td>Dec 9, 1947</td> </tr> <tr> <td width="299">Investigation of Narriquinnep Reservoir, Cortez, Colorado</td> <td width="131">Lynch, Thomas M.</td> <td>Dec 9, 1947</td> </tr> <tr> <td width="299">Results of shocking fish in lower Boulder Creek</td> <td width="131">Klein, William D.</td> <td>Dec 10, 1947</td> </tr> <tr> <td width="299">Shadow Mountain Reservoir fish trap, 1947</td> <td width="131">Klein, William D.</td> <td>1947</td> </tr> <tr> <td width="299"></td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">1948 Reports</td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">Returns from plants of marked fish, 1947</td> <td width="131">Hess, Ray H.</td> <td>Jan 5, 1948</td> </tr> <tr> <td width="299">The use of marked fish in Colorado</td> <td width="131">Hess, Ray H.</td> <td>Jan 1948</td> </tr> <tr> <td width="299">Report of investigations conducted on Ward Lake</td> <td width="131">Klein, William D.</td> <td>Jan 9, 1948</td> </tr> <tr> <td width="299">Summary of fisheries research progress and plans</td> <td width="131">Hess, Ray H.</td> <td>Jan 26, 1948</td> </tr> <tr> <td width="299">Brief report on Huston Lake - Denver County</td> <td width="131">Hess, Ray H.</td> <td>March 24, 1948</td> </tr> <tr> <td width="299">Results of stream census and trout stomach analysis in South Fork of South Platte River below Antero Reservoir</td> <td width="131">Seaman, Wayne R.</td> <td>April 5, 1948</td> </tr> <tr> <td width="299">A report on the information gathered from the study of the methods used by the five leading warm water fish stations visited</td> <td width="131">Lynch, Thomas M.</td> <td>April 6, 1948</td> </tr> <tr> <td width="299">Stream census -- North Fork of Poudre River</td> <td width="131">Klein, William D.</td> <td>April 7-8, 1948</td> </tr> <tr> <td width="299">Results of population checking on Seaman Reservoir, Larimer County</td> <td width="131">Seaman, Wayne R.</td> <td>April 9, 1948</td> </tr> <tr> <td width="299">Fish trapping and tagging operations at Antero Reservoir, spring 1948</td> <td width="131">Seaman, Wayne R.</td> <td>April 29 - May 18, 1948</td> </tr> <tr> <td width="299">An initial plan combining the propatation and stocking of fish fry within the waters in need of such stocking</td> <td width="131">Lynch, Thomas M.</td> <td>April 30, 1948</td> </tr> <tr> <td width="299">Results of the use of a liquid derris solution</td> <td width="131">Lynch, Thomas M.</td> <td>June 2, 1948</td> </tr> <tr> <td width="299">Electrical shocking and marking of fish, South fork South Platte River, 1948&nbsp;</td> <td width="131">Seaman, Wayne R.</td> <td>June 7, 1948</td> </tr> <tr> <td width="299">Results of aquatic fish food counts above and below the Smuggler Mill, Silver Plume, Colorado</td> <td width="131">Seaman, Wayne R.</td> <td>June 15, 1948</td> </tr> <tr> <td width="299">Inspection of a new tailing pond for the Ozark-Mahoning Mill at Jamestown, Colorado</td> <td width="131">Seaman, Wayne R.</td> <td>June 29, 1948</td> </tr> <tr> <td width="299">Olney Springs Reservoir</td> <td width="131">Lynch, Thomas M.</td> <td>June 30, 1948</td> </tr> <tr> <td width="299">Progress report, anti-pollution work, May 25 to July 24, 1948</td> <td width="131">Seaman, Wayne R.</td> <td>July 24, 1948</td> </tr> <tr> <td width="299">Investigation of the Olney Springs Reservoir</td> <td width="131">Lynch, Thomas M.</td> <td>Aug 19, 1948</td> </tr> <tr> <td width="299">Investigation of Rule Creek, located in Bent County</td> <td width="131">Lynch, Thomas M.</td> <td>Aug 23, 1948</td> </tr> <tr> <td width="299">Removal of trash fish from Bellaire Lake</td> <td width="131">Klein, William D.</td> <td>Sept 2, 1948</td> </tr> <tr> <td width="299">Removal of trash fish from Dowdy Lake</td> <td width="131">Klein, William D.</td> <td>Sept 8, 1948</td> </tr> <tr> <td width="299">Fish trapping and tagging operations at Antero Reservoir, fall 1948</td> <td width="131">Weberg, C.A.; Seaman, Wayne R.</td> <td>Sept. 11 - Nov 9, 1948</td> </tr> <tr> <td width="299">Survey of Jackson Lake</td> <td width="131">Lynch, Thomas M.</td> <td>Sept 20, 1948</td> </tr> <tr> <td width="299">Removal of trash fish from Hidden Lake in North Park</td> <td width="131">Klein, William D.</td> <td>Oct 5, 1948</td> </tr> <tr> <td width="299">Salvage on North Sterling and Jumbo Reservoirs</td> <td width="131">Lynch, Thomas M.</td> <td>Oct. 26 - Nov 6, 1948</td> </tr> <tr> <td width="299">Trash fish removal from Hasty Lake</td> <td width="131">Lynch, Thomas M.</td> <td>Nov 30, 1948</td> </tr> <tr> <td width="299"></td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">1949 Reports</td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">Summary of progress report on returns from marked fish</td> <td width="131">Hess, Ray H.; Klein, William D.</td> <td>1949</td> </tr> <tr> <td width="299">Industrial pollution affecting the game fish resource in the state of Colorado</td> <td width="131">Seaman, Wayne R.</td> <td>Jan 5, 1949</td> </tr> <tr> <td width="299">Mileage of trout streams and number of trout lakes -- state of Colorado</td> <td width="131">Seaman, Wayne R.</td> <td>Jan 12, 1949</td> </tr> <tr> <td width="299">A possible plan for Meridith Lake fishery improvement</td> <td width="131">Lynch, Thomas M.</td> <td>Feb 3, 1949</td> </tr> <tr> <td width="299">Progress report, returns from plants of marked fish : 1946, 1947, 1948</td> <td width="131">Hess, Ray H.</td> <td>&nbsp;</td> </tr> <tr> <td width="299">The investigation of the E.R. Bonham Pond near Willard, Colo.</td> <td width="131">Lynch, Thomas M.</td> <td>March 21, 1949</td> </tr> <tr> <td width="299">Clear Creek winter survival experiement</td> <td width="131">Seaman, Wayne R.</td> <td>April 21, 1949</td> </tr> <tr> <td width="299">Progress report, fisheries research investigations, Parvin Lake (Larimer County)</td> <td width="131">Klein, William D.</td> <td>April 22 - Dec 31, 1949</td> </tr> <tr> <td width="299">Rough fish removal from Greeley City Park Lake</td> <td width="131">Simson, J.N.; Lynch, Thomas M.</td> <td>May 6, 1949</td> </tr> <tr> <td width="299">A supplement to the Jackson Lake Survey (Sept. 20, 1948)</td> <td width="131">Lynch, Thomas M.</td> <td>May 9, 1949</td> </tr> <tr> <td width="299">Investigation of Rucker Lake, Fort Logan, Coloirado, regarding dead crappies</td> <td width="131">Seaman, Wayne R.</td> <td>June 17, 1949</td> </tr> <tr> <td width="299">Lake Minnequa survey</td> <td width="131">Lynch, Thomas M.; Evans, Robert</td> <td>July 1, 1949</td> </tr> <tr> <td width="299">The survey of the Holly Gravel Pit</td> <td width="131">Lynch, Thomas M.</td> <td>Aug 22, 1949</td> </tr> <tr> <td width="299">Educational conferences with three of the nation's leaing fish pathologists</td> <td width="131">Seaman, Wayne R.</td> <td>Sept 15 - Oct 24, 1949</td> </tr> <tr> <td width="299">Warm water fish production at Wray Hatchery, Wray, Colorado</td> <td width="131">Lynch, Thomas M.</td> <td>Oct. 26, 1949</td> </tr> <tr> <td width="299">Progress report of Holbrock Lake</td> <td width="131">Lynch, Thomas M.</td> <td>Nov 28, 1949</td> </tr> <tr> <td width="299">Progress report on high lakes stocking experiment, 1949</td> <td width="131">Klein, William D.</td> <td>Dec 1, 1949</td> </tr> <tr> <td width="299">Investigation of Palmer Lake, located at the headwaters of Camp Creek, 10 miles N.W. of Colorado Springs</td> <td width="131">Perkins, W.E.; Colley, F.</td> <td>Dec 5, 1949</td> </tr> <tr> <td width="299">6500 - 7000 foot altitude survey</td> <td width="131">Seaman, Wayne R.</td> <td>Dec 9, 1949</td> </tr> <tr> <td width="299">The warm water fish research program that was carried out during 1949, and the new program for 1950</td> <td width="131">Andrews, R. M.</td> <td>Dec 22, 1949</td> </tr> <tr> <td width="299"></td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">1950 Reports</td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">Returns from plants of marked fish in Claear Creek</td> <td width="131">Klein, William D.; Seaman, Wayne R.</td> <td>Feb 21, 1950</td> </tr> <tr> <td width="299">Progress report, Antero Reservoir studies</td> <td width="131">Boyd, James.</td> <td>April 1, 1950</td> </tr> <tr> <td width="299">First year returns from trout tagged in 1949</td> <td width="131">Klein, William D.</td> <td>April 1, 1950</td> </tr> <tr> <td width="299">Trout egg and broodstock investigations, Massachusetts</td> <td width="131">Feast, Cleland N., II</td> <td>June 29, 1950</td> </tr> <tr> <td width="299">Elementary survey of Dolores River, from Utah line to Paradox Valley, Colorado</td> <td width="131">Lynch, Thomas M.; Bessire, Scott; Gray, Joseph</td> <td>July 16-17, 1950</td> </tr> <tr> <td width="299">An Experimental project of feeding stunted ring perch at the Las Animas hatchery</td> <td width="131">Lynch, Thomas M.; Gray, Joseph</td> <td>Oct 5, 1950</td> </tr> <tr> <td width="299">Warm water fish production at Wray Hatchery and a discussion of future plans</td> <td width="131"></td> <td>Dec 5, 1950</td> </tr> <tr> <td width="299"></td> <td width="131"></td> <td>&nbsp;</td> </tr> <tr> <td width="299">1951-1953 Reports</td> <td width="131">&nbsp;</td> <td>&nbsp;</td> </tr> <tr> <td width="299">Progress report, fisheries research (reports for Feb, March, April, May, June)</td> <td width="131">Klein, William D.</td> <td>1951</td> </tr> <tr> <td width="299">Black lake report</td> <td width="131">Seaman, Wayne R.; Klein, William D.</td> <td>June 29, 1951</td> </tr> <tr> <td width="299">A recommendation to utilize two inch hatchery trout for stocking certain "type" lakes</td> <td width="131">Klein, William D.</td> <td>1952</td> </tr> <tr> <td width="299">Lake survey of Lonetree Reservoir, 1952</td> <td width="131">Fisk, Leonard O.</td> <td>1952</td> </tr> <tr> <td width="299">Yellow perch and carp expeiment</td> <td width="131">Lynch, Thomas M.</td> <td>March 30, 1951-March 30, 1952</td> </tr> <tr> <td width="299">Survey of Holly Drainage canal</td> <td width="131">Lynch, Thomas M.</td> <td>July 7, 1952</td> </tr> <tr> <td width="299">Population census, Harvey Gap Reservoir</td> <td width="131">Lynch, Thomas M.</td> <td>Aug 22, 1952</td> </tr> <tr> <td width="299">Favorable results from plants of two inch trout in an experimental lake</td> <td width="131">Klein, William D.</td> <td>1953?</td> </tr> <tr> <td width="299">Investigation of Prewitt Reservoir to determine the feasibility of increasing its water level</td> <td width="131">Lynch, Thomas M.; Evans, Robert L.</td> <td>Feb 28, 1953</td> </tr> <tr> <td width="299">Recommended management plan for six lakes</td> <td width="131">Lynch, Thomas M.</td> <td>March 15, 1953</td> </tr> </tbody> </table> Creator An entity primarily responsible for making the resource Colorado Game and Fish Department Rights Information about rights held in and over the resource <a href="https://rightsstatements.org/page/InC-NC/1.0/?language=en">In Copyright - Non-Commercial Use Permitted</a>