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<br />--=, . :.) <br /> <br />No,: Fe;. ?:Jb <br />(for MC use) <br /> <br />RECOVERY IMPLEMENTATION PROGRAM <br />fOR THE ENDANGERED fISH SPECIES <br />IN THE UPPER COLORADO RIVER BASIN <br /> <br />fY-1995 <br />SCOPE-Of-WORK <br />RESEARCH PROPOSAL <br /> <br />Lead Agency: <br />Submit ted by: <br />Address: <br /> <br />Phone: <br /> <br />U.S. fish and Wildlife Service <br />Bruce Haines and Tim Modde <br />1680 West Hwy 40 <br />Vernal. UT 84078 <br />(801) 789-0354 <br /> <br />Cateqory Icheck one) <br />_ Ongoing project <br />X Requested new start <br />_ Unsolicited project <br />Outside funding <br /> <br />and <br /> <br />Phone: <br /> <br />Dr, Robert Muth and Kevin Bestqen <br />Larval Fi sh Laboratory <br />Colorado State University <br />Fort Collins. CO 80523 <br />(303) 49]-5295 <br /> <br />Address: <br /> <br />], Title of Proposal: <br /> <br />The effects of winter and spring flows on movement, dispersal and survival of young <br />Colorado squawfish, <br /> <br />II, Relationship to Recovery Program/Ranking Factors: <br /> <br />The Biological Opinion points out the need to evaluate and refine winter/spring flows <br />in the Green River. An important aspect of refi n i ng fl ow recommend at ions is to <br />determine the affects of flow on downstream distribution and overwinter survival of <br />young Colorado squawfish. Overwinter survival is often the critical factor determining <br />year cl ass strength of temperate zone fishes, Winter flows are thought to play an <br />important role in overwinter survival of young Colorado squawfi.sh by breaking up ice <br />and causing direct mortality or causing fish movement when energetically it results in <br />increased mortality, <br /> <br />Current efforts (spring selnlng of young Colorado squawfish by UDWR and BioWest) to <br />eva 1 uate overwi nter morta 1 ity are based on catch per un it effort in the fa 11 and <br />spring, This method for calculating overwinter mortality relies on the assumptions <br />that fish are equally vulnerable to seining' in the fall and spring, and that the same <br />population is being sampled at both times. Both of these assumptions are in question. <br />The proposed study complements the existing study by]) determining extent of fish <br />movement between fall and spring, 2) determining the effect of spring flow on dispersal <br />of age-] fish, 3) determining catchability coefficients of young Colorado squawfish in <br />