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<br />. . <br /> <br />NO: Asninall-D <br />(for MG use) <br /> <br />RECOVERY IKPLEMENTATION PROGRAM <br />FOR THE ENDANGERED FISH SPECIES <br />IN THE UPPER COLORADO RIVER BASIN <br /> <br />FY-1994 <br />SCOPE-OF-VORK <br />RESEARCH PROPOSAL <br /> <br />Phone: <br /> <br />U.S. Fish & Wildlife Service <br />Colorado River Fishery Project <br />Frank K. Pfeifer, Project Leader <br />Charles W. McAda, Fishery Biologist <br />529 25 1/2 Road. Suite B-110 <br />Grand Junction, Colorado 81505 <br />303-245-9319 <br /> <br />Cate20rv (check one): <br />X Ongoing project <br />Requested new start <br />Unsolicited project <br />Outside funding <br /> <br />Lead Agency: <br /> <br />Submitted by: <br /> <br />Address: <br /> <br />Date: <br /> <br />April 30, 1993 <br /> <br />I. Title of Proposal: <br /> <br />ASPINALL STUDY--Flow effects on young-of-the-year Colorado squswfish and <br />sympatric species. <br /> <br />II. Relationship to Recovery Program/Ranking Factors: <br /> <br />An important element of the Recovery Implementation Program (RIP) is <br />identification of the quantity and quality of flows needed as part of the <br />recovery effort for the endangered fishes. The proposed continuation of <br />ongoing research will result in an empirical means to aid the <br />determination of these flows. Work on the present project began in FY 89, <br />when RIP funding was provided for (1) studies of the relations between <br />larval fishes and river discharge in the upper Colorado River, (2) <br />analyses of resulting data and data collected during earlier <br />investigations, and (3) laboratory investigations of predation on larval <br />razorback sucker and Colorado squawfish by other fishes commonly found in <br />backwaters. This initial effort has yielded valuable results. In a <br />recent report, HcAda and Kaeding ("Relations between maximum-annual river <br />discharge and the relative abundance of age-O Colorado squawfish and other <br />fishes in the upper Colorado River") showed that relative abundance of <br />age-O Colorado squawfish and of other sympatric fishes was related to <br />maximum river discharge. Such information is particularly useful to the <br />development of flow recommendations. However, the relations between <br />relative abundance and flows differed among species, and the sympatric <br />species that have important negative effects on Colorado squawfish are not <br />well understood. Laboratory work funded in FY 89 and initiated in 1990, <br />has begun to reveal those species that have important negative effects on <br />young of both Colorado squawfish and razorback sucker. This Scope of Work <br />describes research in support of these important efforts. <br />