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<br />~ <br /> <br />e, <br /> <br />No.: ;l.~3 <br />(for Me use) <br /> <br />RECOVERY IMP~ION PROGRAH <br />FOR TIlE EllDANGBRBD FISH SPECIES <br />IN TIlE UPPER COLORADO RIVER BAS.IJl <br /> <br />FY-U93 <br />SCOPE-OF-WORlt <br />RESEARCH PROPOSAL <br /> <br />Phone: <br />Date: <br /> <br />Utah Wildlife Resources <br />Leo Lentsch <br />1596 West North Temole. <br />Salt Lake Citv. UT 84116 <br />18011 538-4756 <br />Mav 7. 1991 <br /> <br />Cateaorv Icheck onel: <br />Ongoing project <br />X Reque.ted new start <br />Unsolicited project <br />Outside funding <br /> <br />Lead Agency: <br />Submitted by: <br />Address: <br /> <br />I. Title of Proposal: <br /> <br />Aspinal Studies: Effect of flows on reproductive success of Colorado <br />squawfish <br /> <br />II. Relationship to Recovery Program/Ranking Factors: <br /> <br />Research, Habitat Management - help determine flows and environmental <br />facts associated with reproductive success and early life survival of <br />fishes in the Upper Colorado River basin. <br /> <br />III. Study Goals. Objectives, End Product: <br /> <br />Objectives of the study are to use collections of drifting larvae to <br />document Colorado squawfish spawning, determine peaks in relative <br />abundance of drifting Colorado larvae, and determine the relative <br />abundance of Colorado squawfish larvae transported into nursery <br />habitats. <br /> <br />IV. Study area (river miles, if appropriate): <br /> <br />Utah portion of the Colorado River <br /> <br />V. Study Methods/Approach: <br /> <br />Reproduction will be assessed using drift-net sampling at three sites: <br />one immediately upstream of Westwater Canyon, the second near Moab, <br />Utah, and the third between Potash and the Green/Colorado confluence. <br />Near-shore drift-net sampling (using flow-metered nets) will be <br />conducted daily at dawn during June-early August. Samples will be <br />preserved in ethanol to allow for subsequent ageing using otoliths <br />(determination of spawning times). <br /> <br />Data gathered from this study will provide information on relationships <br />between relative reproductive sUCCesS and annual flow regimes, and a <br />relative measure of input into downstream nursery habitats. <br /> <br />VI. Task Description (FY-1992): See above <br />