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<br />COLORADO RIVER RECOVERY PROGRAM <br />FY 97 ANNUAL PROJECT REPORT <br /> <br />RECOVERY PROGRAM <br />PROJECT NUMBER r~p q~ <br /> <br />I. Title: Determine habitat availability and habitat use of <br />endangered fishes in the Yampa River during baseflow <br />periods. <br /> <br />II. principal Investigators: <br /> <br />Tim Modde <br />Colorado River Fish Project <br />266 W. 100 N., Suite 2 <br />Vernal, UT 84078 <br />801/789-0354, FAX: 801/789-4805 <br /> <br />Rick Anderson <br />Colorado Division of Wildlife <br />317 W. Prospect <br />Fort Collins, CO 80526 <br />970/484-2836 x 339 <br /> <br />III. Project Summary: The hydrology of the Yampa River has a <br />major impact on the life history of endangered fishes in the <br />Green River subbasin. Because of the annual and seasonal <br />variability in the hydrograph, this river supports a high <br />ratio of native to nonnative fish, including populations of <br />the endangered humpback chub and Colorado squawfish. <br />currently, the influence of future water developments in the <br />Yampa River valley on endangered fish populations cannot be <br />predicted with a high degree of confidence. The goal of <br />this study will be to determine habitat availability at <br />various low flow scenarios and habitat use patterns of. <br />endangered fishes in the Yampa River during the lowest flow <br />period of the year (i.e. August through October) . <br /> <br />IV. Study Schedule: <br />a. Initial year: FY 1996 <br />b. Final year: FY 1998 <br /> <br />V. Relationship to RIPRAP: This study relates to the Green <br />River Action Plan Yampa River elements 1.A.2., <br />1.A.4.a. (3). (a)., and 1.B.2. of identifying baseflow <br />discharge needs of endangered fishes in the Yampa River. <br /> <br />VI. Accomplishment of FY 97 Tasks and Deliverables of Initial <br />Findings and Shortcomings: This study consisted of telemetry <br />and physical habitat modeling components. During 1997, 5 <br />Colorado squawfish, 2 channel catfish, and 5 humpback chub <br />were implanted with radio transmitters (CS above the canyon <br />and other fish in the canyon). Because humpback chub were <br />difficult to locate in 1996, transmitters with external <br />antennas were implanted in 1997. Distance traveled was <br />monitored as planned for all species. Twenty-four hour <br />