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Last modified
7/14/2009 5:02:37 PM
Creation date
5/20/2009 3:06:21 PM
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UCREFRP
UCREFRP Catalog Number
9690
Author
Recovery Implementation Program
Title
Recovery Implementation Program For Endangered Fish Species In The Upper Colorado River Basin 23rd Annual Recovery Program Researchers Meeting
USFW Year
2002
USFW - Doc Type
21
Copyright Material
NO
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Lengths of northern pike ranged from 175 mm to 950 mm with an average of612 mm. Age <br />analysis using cleithra indicates the presence of all year classes one through ten. Most northern <br />pike collected were from the 2 through 4 year age classes and ranged from 400 to 800 mm in <br />length. <br /> <br />Hawkins, J., C. Walford, and T. Sorenson <br /> <br />Larval Fish Laboratory, Colorado State University, Ft. Collins, CO <br /> <br />Northern Pike Translocation on the Yampa River, 2001. Northern pike Esox lucius, are a <br />nonnative species that escaped from a reservoir in the Yampa River basin in the late 1970s. They <br />have established a reproducing population in the Yampa River and expanded their range <br />downstream into the middle Green River. We will present results from 2001, the third year ofa <br />removal and translocation project for northern pike in the Yampa River, and compare this year's <br />results with those of previous years. We will also discuss potential methods for evaluating the <br />effectiveness of removal. In the spring of2001, northern pike were captured from a 75-mile long <br />reach of the Yampa River between Craig, Colorado and Dinosaur National Monument. Pike were <br />captured by electro fishing both shorelines along the entire reach and by electro fishing and fyke <br />nets in backwaters. Effort included 177 hours of electro fishing and 279 hours offyke-net sets on <br />four primary sampling occasions. A total of268 northern pike were captured, including 94,84, <br />60, and 30 individuals on trips one through four, respectively. All northern pike were transported <br />alive to an off-stream reservoir in the White River drainage. Northern pike often co-occurred with <br />Colorado pikeminnow Ptychocheilus lucius. Of 121 Colorado pikeminnow captured, 18 % had <br />noticeable pike-bite injuries and another 6 % had injuries that were potentially caused by pike. <br />About 60% of the Colorado pikeminnow injuries were healed at capture and the remaining 40% <br />were open wounds of varying severity. <br /> <br />Fuller, M. <br /> <br />U.S. Fish and Wildlife Service, Colorado River Fish Project Office, Vernal, UT <br /> <br />The Channel Catfish Reduction Program in the Lower Yampa River. The findings of a study <br />to assess capture methods and to determine the feasibility of mechanically reducing the abundance <br />of channel catfish in the lower Yampa River (initiated in 1998-99) serves as the basis for this large <br />scale channel catfish reduction program. The previous study resulted in significant reductions in <br />channel catfish abundance along several relatively short reaches of river. Beginning in 2001; this <br />three year removal effort includes the entire river from Deerlodge Park to Echo Park (rm 46-0) <br />and utilizes the most efficient methods of capture as determined in 1998. Other components of <br />this study include monitoring fish community responses to catfish removal, and channel catfish <br />reproduction and recruitment. Program objectives and design as well as this years resulting efforts <br />will be presented. <br /> <br />9 <br />
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