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ID: Draft proposed Upper Colorado River Headwaters project monitoring plan
Draft proposed Upper Colorado River Headwaters project monitoring plan
Type: Text
Subjects: Upper Colorado River Headwaters
Habitat restoration
Item
view first image of Draft proposed Upper Colorado River Headwaters project monitoring plan
Draft proposed Upper Colorado River Headwaters project monitoring plan
Type:Text
Subject:Upper Colorado River Headwaters
Habitat restoration
Description:In December 2016, a group of partners including American Rivers, Colorado Parks and Wildlife (CPW), Colorado River Water Conservation District (CRWCD), Colorado Water Conservation Board (CWCB), Denver Water, Grand County, Irrigators of Lands in the Vicinity of Kremmling (ILVK), Municipal Subdistrict of Northern Colorado Water Conservancy District (Northern Water), Trout Unlimited, and the Upper Colorado River Alliance was awarded $7.75 million by the U.S. Department of Agriculture Natural Resources Conservation Service (NRCS) through their Regional Conservation Partnership Program (RCPP) for the Upper Colorado River Headwaters Project (Headwaters Project). The Headwaters Project is comprised of three endeavors within Grand County that will collectively restore fish and wildlife habitat, and improve water quality and agricultural water management on a regional scale. The RCPP funding will be utilized to focus on two specific project components: 1) reconnecting the Colorado River upstream and downstream of Windy Gap Reservoir (referenced as the Windy Gap Connectivity Channel Project); and 2) restoration of the Colorado River channel to be resilient to hydrological modifications, while sustaining agriculture, and aquatic and riparian habitat (referenced as the Irrigators of Lands in the Vicinity of Kremmling Project). The third endeavor, the Kemp Breeze State Wildlife Area (SWA) Habitat Restoration Project, is expected to be funded by the partners, and other interested parties. These three project components are further described in the following sections. [show more]
ID: Draw recap glossary
Draw recap glossary
Type: Text
Subjects: Hunting
Item
view first image of Draw recap glossary
Draw recap glossary
Type:Text
Subject:Hunting
Description:Prior to 2015, draw statistics were primarily designed for internal use by CPW staff to validate the draws and to manage hunting. However, hunters use the same information, so we make this data available to Colorado’s hunters. Redesign of the Draw Recap information combines pre-draw and post-draw information in an easy to read layout. Each report has a summary page which summarizes all applications and hunts in that draw and detail pages which summarize draw information for each quota. The report is broken out into zones to help organize the information. This color coded glossary explains each zone including descriptions and possible values for each field. [show more]
ID: Draw recap walkthrough
Draw recap walkthrough
Type: Text
Subjects: Hunting
Item
view first image of Draw recap walkthrough
Draw recap walkthrough
Type:Text
Subject:Hunting
Description:THIS IS A DIGITAL WALKTHROUGH SAMPLE REPORT Hover the cursor over any field in this report for information regarding that field.
ID: Dual Disease Resistance in Rainbowy Trout Fact Sheet
Dual Disease Resistance in Rainbowy Trout Fact Sheet
Type:
Subjects:
Item
view first image of Dual Disease Resistance in Rainbowy Trout Fact Sheet
Dual Disease Resistance in Rainbowy Trout Fact Sheet
ID: Dual resistance to Flavobacterium psychrophilum and Myxobolus cerebralis in rainbow trout (Oncorhynchus mykiss, Walbaum)
Dual resistance to Flavobacterium psychrophilum and Myxobolus cerebralis in rainbow trout (Oncorhynchus mykiss, Walbaum)
Type: Article
Subjects: Bacterial coldwater disease
<em>Flavobacterium psychrophilum</em>
<em>Myxobolus cerebralis</em>
Rainbow trout

Whirling disease
Item
view first image of Dual resistance to Flavobacterium psychrophilum and Myxobolus cerebralis in rainbow trout (Oncorhynchus mykiss, Walbaum)
Dual resistance to Flavobacterium psychrophilum and Myxobolus cerebralis in rainbow trout (Oncorhynchus mykiss, Walbaum)
Type:Article
Subject:Bacterial coldwater disease
<em>Flavobacterium psychrophilum</em>
<em>Myxobolus cerebralis</em>
Rainbow trout

Whirling disease
Description:Aquatic pathogens are a major concern for fish hatchery production, fisheries management, and conservation, and disease control needs to be addressed. Two important salmonid pathogens are Myxobolus cerebralis and Flavobacterium psychrophilum that cause whirling disease and bacterial coldwater disease (BCWD), respectively. Innate disease resistance is a potential option for reducing disease-related mortality in hatchery-reared rainbow trout (Oncorhynchus mykiss, Walbaum). Two experiments were conducted to assess pathogen resistance of first-generation (F1) rainbow trout created by crossing M. cerebralis- and F. psychrophilum-resistant strains. In the first experiment, we exposed two rainbow trout strains and one F1 cross to six treatments: control (no exposure), mock injection, F. psychrophilum only, M. cerebralis only, F. psychrophilum then M. cerebralis, and M. cerebralis then F. psychrophilum. Results indicated that the F1 cross was not resistant to either pathogen. In the second experiment, we exposed five rainbow trout strains and four rainbow trout crosses to F. psychrophilum. The second experiment indicated that at least one rainbow trout cross was F. psychrophilum-resistant. Achieving dual resistance may be possible using selective breeding but only some multigenerational strains are suitable candidates for further evaluation. [show more]
ID: Early Colorado Hunting and Fishing Regulations
Early Colorado Hunting and Fishing Regulations
Type:
Subjects:
Item
view first image of Early Colorado Hunting and Fishing Regulations
Early Colorado Hunting and Fishing Regulations
Description:The earliest hunting and fishing regulation in the library collection is a small, pocket-sized card issued April 11, 1917 summarizing limits and license regulations for both Game and Fish. The earliest brochures, issued from 1937-1947, covered both hunting and fishing bag limits and regulations.Related collections: Print regulations available: CPW Research Library: Brochure Files [show more]
ID: EBSCO Discovery Quick Guide
EBSCO Discovery Quick Guide
Type:
Subjects:
Item
view first image of EBSCO Discovery Quick Guide
EBSCO Discovery Quick Guide
Description:EBSCO Discovery Service (EDS) features at a glance.
ID: Education, outreach, and partnerships 2020 annual report
Education, outreach, and partnerships 2020 annual report
Type: Text
Subjects: Education and interpretation
Outreach
Partnerships
Item
view first image of Education, outreach, and partnerships 2020 annual report
Education, outreach, and partnerships 2020 annual report
Type:Text
Subject:Education and interpretation
Outreach
Partnerships
Description:Colorado Parks and Wildlife (CPW) employs some of the most talented staff committed to inspiring future generations and connecting people to meaningful outdoor experiences. Whether it’s leading a guided hike, presenting to a local school group, teaching hunting or fishing skills, or working events with valued partners, CPW staff and volunteers continuously demonstrate their dedication to one of the most important sentiments in our mission: educate and inspire current and future generations to serve as active stewards of Colorado’s natural resources. How we accomplish this vision, along with connecting to our Strategic Goals, manifests across the state and across disciplines, in a myriad of ways. One only needs to peruse the next few pages of this report to see that. [show more]
ID: Effectiveness of a redesigned vaginal implant transmitter in mule deer
Effectiveness of a redesigned vaginal implant transmitter in mule deer
Type: Article
Subjects: Birth site
Capture
Colorado
Fawn
Fetus
Mule deer
Neonate
<em>Odocoileus hemionus</em>
Parturition
Vaginal implant transmitter (VIT)
Item
view first image of Effectiveness of a redesigned vaginal implant transmitter in mule deer
Effectiveness of a redesigned vaginal implant transmitter in mule deer
Type:Article
Subject:Birth site
Capture
Colorado
Fawn
Fetus
Mule deer
Neonate
<em>Odocoileus hemionus</em>
Parturition
Vaginal implant transmitter (VIT)
Description:Our understanding of factors that limit mule deer (Odocoileus hemionus) populations may be improved by evaluating neonatal survival as a function of dam characteristics under free-ranging conditions, which generally requires that both neonates and dams are radiocollared. The most viable technique facilitating capture of neonates from radiocollared adult females is use of vaginal implant transmitters (VITs). To date, VITs have allowed research opportunities that were not previously possible; however, VITs are often expelled from adult females prepartum, which limits their effectiveness. We redesigned an existing VIT manufactured by Advanced Telemetry Systems (ATS; Isanti, MN) by lengthening and widening wings used to retain the VIT in an adult female. Our objective was to increase VIT retention rates and thereby increase the likelihood of locating birth sites and newborn fawns. We placed the newly designed VITs in 59 adult female mule deer and evaluated the probability of retention to parturition and the probability of detecting newborn fawns. We also developed an equation for determining VIT sample size necessary to achieve a specified sample size of neonates. The probability of a VIT being retained until parturition was 0.766 (SE = 0.0605) and the probability of a VIT being retained to within 3 days of parturition was 0.894 (SE = 0.0441). In a similar study using the original VIT wings (Bishop et al. 2007), the probability of a VIT being retained until parturition was 0.447 (SE = 0.0468) and the probability of retention to within 3 days of parturition was 0.623 (SE = 0.0456). Thus, our design modification increased VIT retention to parturition by 0.319 (SE = 0.0765) and VIT retention to within 3 days of parturition by 0.271 (SE = 0.0634). Considering dams that retained VITs to within 3 days of parturition, the probability of detecting at least 1 neonate was 0.952 (SE = 0.0334) and the probability of detecting both fawns from twin litters was 0.588 (SE = 0.0827). We expended approximately 12 person-hours per detected neonate. As a guide for researchers planning future studies, we found that VIT sample size should approximately equal the targeted neonate sample size. Our study expands opportunities for conducting research that links adult female attributes to productivity and offspring survival in mule deer. [show more]
ID: Effects of Brown Trout Removal on Reestablishing Populations of Rainbow Trout
Effects of Brown Trout Removal on Reestablishing Populations of Rainbow Trout
Type:
Subjects:
Item
view first image of Effects of Brown Trout Removal on Reestablishing Populations of Rainbow Trout
Effects of Brown Trout Removal on Reestablishing Populations of Rainbow Trout
Description:Led by:Dr. Eric R. Fetherman

Study area:Gunnison River, Cache la Poudre River, and Yampa River Project status:Completed

Research Objectives

  • To determine the effects of brown trout removal on reestablishing populations of rainbow trout.
  • To improve rainbow trout retention and survival following reintroduction. ​

Project Description

Rainbow trout populations experienced significant population declines following the establishment of whirling disease to Colorado in the 1980s. Brown trout, however, evolved with the parasite that causes whirling disease in their European home range, so they developed a resistance to the disease. As a result, brown trout populations exhibited increases in many rivers across the state as they filled the open niches left behind by rainbow trout.

Fishery managers stock whirling disease resistant rainbow trout​(known as the Hofer) in many of the state's waters to supplement and recover populations lost to the disease. However, increased numbers of brown trout result in greater predation on and competition with the stocked rainbows, reducing the survival and retention of rainbow trout populations. 

As a result, CPW initiated several experiments on the Gunnison and Cache la Poudre Rivers to examine the effects of brown trout removal on fry and adult rainbow trout retention and survival following reintroduction to these rivers. 

In the Gunnison River (Gunnison Gorge National Conservation Area near Montrose, Colo.), researchers conducted two experiments. Two 1-mile sections of the river were used for the experiments. In both, brown trout fry were removed from one half of the 1-mile study section, and rainbow trout were introduced after the removal. The results from these experiments suggested that rainbow trout fry exhibited higher survival and retention rates in the sections from which brown trout fry had been removed compared to those sections in which brown trout fry had not been removed.  

The largest of the brown trout removal experiments occurred in the Cache la Poudre River, northwest of Fort Collins, Colo. The study, a cooperative research project between Colorado State University and Colorado Parks and Wildlife, was designed to determine if adult brown trout removal and relocation could be used to reestablish wild rainbow trout populations. During the experiments, researchers examined the interactions between brown trout and stocked rainbow trout, including the potential for competition, predation, emigration, survival and growth.

Movement and survival data suggest that brown trout removal and relocation had a positive short-term effect. Rainbow trout displayed higher survival and lower emigration rates in the removal section in the months following the removal. On average, rainbow trout grew 1.5 inches in the two months following their introduction. However, rainbow trout emigration and survival decreased as time went on, suggesting that brown trout removal and relocation did not increase long-term survival or retention of rainbow trout.​

CPW initiated an experiment in the Yampa River in 2017 to determine the effects of large-scale brown trout removal on wild and stocked fingerling and catchable rainbow trout survival. Brown trout removal occurred across four years and over a nearly seven mile stretch of the Yampa River between Stagecoach Reservoir and Lake Catamount. Because this is a closed system between two reservoirs and the removals occurred over a greater distance than in the Cache la Poudre River, brown trout removal appeared to be more effective at reducing the number of brown trout adults in the system, and thereby competition and predation on wild and stocked rainbow trout. Results are pending, but preliminary estimates suggest that both rainbow trout retention and survival increased in the Yampa River as a result of the brown trout removals.

CPW will continue to conduct research on the interactions between brown trout and rainbow trout. Using this research, CPW hopes to reestablish rainbow trout populations in Colorado's rivers. ​

Associated Publications

Fetherman, E. R., D. L. Winkelman, L. L. Bailey, G. J. Schisler, and K. Davies. 2015. Brown trout removal effects on short-term survival and movement of Myxobolus cerebralis­­-resistant rainbow trout. Transactions of the American Fisheries Society 144:610-626.​

Fetherman, E. R., and G. J. Schisler. 2013. Sport Fish Research Studies. Federal Aid Project F394-R12. Federal Aid in Fish Restoration Job Progress Report. Colorado Parks and Wildlife. Aquatic Research Section. Fort Collins, CO. 132.Read an overview of Colorado's research on whirling disease in the Whirling Disease Fact Sheet.

 [show more]