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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 />reaches and the lower Duchesne River, and the Larval Fish Laboratory at Colorado State <br />University sampled the Yampa River. About 500 miles of river were sampled prior to and during <br />spring runofffrom late-April through mid-June. About 1,191 hours (149 8-hr days) of boat or raft <br />electro fishing time was expended in all reaches. A substantial amount of effort was also devoted <br />to fyke- and trammel-net sampling of backwaters in the Yampa River. A total of 1,295 Colorado <br />pikeminnow were captured in all passes; 358 from the middle Green River, 256 from the <br />Desolation Canyon reach ofthe Green River, 209 from the lower Green River, 212 from the <br />White River, and 120 from the Yampa River. A total of 140 Colorado pikeminnow were <br />recaptured once and eight individuals were recaptured twice. Size structure and preliminary <br />abundance estimates of Colorado pikeminnow from each reach will be presented. <br /> <br />Kitcheyan, C. <br /> <br />u.s. Fish and Wildlife Service, Colorado River Fishery Project Office, Vernal, ur <br /> <br />Seasonal and Daily Movement Patterns of Colorado pikeminnow in Lodore Canyon. <br />Colorado pikeminnow have been described as having fidelity to a home range and traveling as far <br />as 360 km to one of two spawning sites in the Green River subbasin. Over the last two years <br />(2000 and 2001), data obtained from aerial surveys and telemetry (i.e. data logger and ground <br />surveys) have showed adult Colorado pikeminnow from Lodore Canyon display a great deal of <br />mobility and flexibility in habitat use. Between 2000 and 2001, fourteen Colorado pikeminnow <br />were implanted with transmitters in Lodore Canyon. In 2000, fish emigrated out of the canyon <br />from August to October and did not overwinter in the canyon. An aerial survey found <br />pikeminnow ranging from Horseshoe Bend and extending upstream into the Yampa River. In <br />2001, radio tagged fish began dispersing back into the canyon as early as March and continued on <br />into the month of July. Fish passage by the telemetry logger, above the Yampa River confluence, <br />occurred during midnight and early morning hours. Aerial surveys in the spring and summer, <br />found pikeminnow throughout the canyon and upstream into Browns Park National Wildlife <br />Refuge. Diel observations in Lodore Canyon, concluded pikeminnow were very mobile or <br />remained stationary, occupying an eddy or pool. Two fish displayed a great deal of mobility, <br />moving long distances (i.e. 1.9 and 2.2 km) in the late afternoon. Combined information from the <br />data logger and aerial contacts implied radio tagged fish did not overwinter in the canyon, two <br />fish were located above the Gates ofLodore. Nine other fish were found below the confluence, <br />from the Yampa River extending downstream into the Green River to Horseshoe Bend. Colorado <br />pikeminnow do not appear to be establishing a pennanent residency in Lodore Canyon, but <br />instead use this area opportunistically. <br /> <br />Ross, S. T.1, and T. Modde2 <br /> <br />'University of Southern Mississippi; 2U.S. Fish and Wildlife Service, Colorado River Fishery Project Office, <br />Vernal, UT <br /> <br />Age Determination and Life History Aspects ofthe Roundtail Chub, Gila robusta <br />(Cyprinidae), in the Yampa River Canyon. The Gila complex includes three large, <br /> <br />15 <br />
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