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<br /><L.:'''.I.;'' <br />,~-:J <br /> <br />",'" <br />'.}J.,J <br /> <br />Research Component <br />Task. No. <br /> <br />SDCR <br />3 <br /> <br />No. : <br /> <br />(for MC use) <br /> <br />RECOVERY IMPLEMENTATION PROGRAM <br />POR THE ENDANGERED PISH SPECIES <br />IN THE COLORADO RIVER BASIN <br /> <br />PY-1992 <br />SCOPE-OP-WORK <br />RESEARCH PROPOSAL <br /> <br />Lead Agency: <br />Submitted by: <br />Address: <br /> <br />U.S. Fish and wildlife Serv <br />H. Tyus, G. Haines, C. Karp <br />Colorado River Fish project <br />1680 West Hwy 40 <br />Vernal, Utah 84078 <br /> <br />Cateaorv (check onel : <br />-Z- Ongoing project <br />Requested new start <br />Unsolicited project <br />Outside funding <br /> <br />I. Title of Proposal: <br /> <br /> <br />An evaluation of Colorado squawfish recruitment <br /> <br /> <br />II. Relationship to Recovery program/Ranking Factors: <br /> <br />Management and future recovery of Colorado squawfish would benefit from an <br />evaluation of the survival of younger age-classes with respect to <br />prevailing environmental conditions. <br /> <br />III. Study Goals, Objectives, End Product: <br /> <br />To determine relative abundance of young (age-O to age-1) Colorado <br />squawfish with respect to river conditions in autumn, early spring (pre- <br />runoff) and late spring or early summer (post runoff_, based on existing <br />data and information. <br /> <br />To evaluate environmental factors that might influence estimates of <br />standing crops of young squawfish from the autumn to spring. <br /> <br />To determine behavioral patterns in young squawfish that might influence <br />their vulnerability to sampling gear. <br /> <br />To evaluate the relative abundance of various size-classes of Colorado <br />squawfish and identify data gaps and future research needs. <br /> <br />IV. Study area: Green River <br /> <br />V. Study Methods/Approach: <br /> <br />Past efforts to determine overwintering survival rates for young Colorado <br />squawfish in their first year of life have not been successful; i.e., <br />statistical testing has not demonstrated a significant difference in <br />standing crops (Tyus and Haines 1991l. However, past studies have relied <br />only on an evaluation of the catch-per-unit-effort in Autumn relative to <br />catch-per-unit-effort in the spring. New methods need to be developed <br />that would provide a reasonable estimate of overwintering <br />mortality/survival for young Colorado squawfish to aid in evaluating <br />potential differences in survival wi th different winter flows. This <br /> <br />C9 <br />