Laserfiche WebLink
<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 />