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<br />responsible for the Green River reach from Tusher downstream to the Colorado River River. <br />The Larval Fish Laboratory will provide coordination, data checking, and data analysis <br />assistance. Our primary goal was to capture, mark, and recapture as many Colorado pikeminnow <br />as possible on at least three different sampling occasions in each river reach. Sampling occurred <br />during spring runoff and ended before pikeminnow spawning migration. Electrofishing was the <br />primary sampling gear. Captured pikeminnow were scanned for the presence of a PIT tag, and <br />unmarked fish were marked. In 2001, a total of 574 Colorado pikeminnow captures were <br />recorded. In 2002, a total of 352 Colorado pikeminnow captures were recorded. These data will <br />be used to obtain abundance estimates for each river reach. <br /> <br />IV. <br /> <br />Study Schedule: <br /> <br />Initial Year <br />Final year <br /> <br />2001 <br />2003 <br /> <br />V. Relationship to RlPRAP (Version: March 8, 2000): <br /> <br />V. <br /> <br />Monitor populations and habitat and conduct research to support recovery <br />actions (research, monitoring, and data management) <br />Conduct research to acquire needed life history information <br />Conduct appropriate studies to provide needed life history information. <br /> <br />V.B. <br />V.B.2. <br /> <br />VI. Accomplishment ofFY 2002 Tasks and Deliverables, Discussion ofInitial Findings and <br />Shortcomings: <br /> <br />Goal: Obtain a reasonable (confidence intervals of less than 20% of estimate) estimate of <br />the adult population abundance and survival of Colorado pikeminnow occupying the <br />lower Green River study area. <br /> <br />Task description and schedule: <br /> <br />Task 1. Three sample passes through section] (confluence with White River to Tusher <br />Wash Diversion) using 2 electrofishing rafts, and marking and recapturing <br />Colorado pikeminnow '" 250 nun TL; complete task within 50 days after <br />starting. Sampling occurred in spring. <br /> <br />Task 2. Three sample passes through section 2 (Tusher Wash Diversion to confluence <br />with Colorado River) using 2 electrofishing boats, and marking and recapturing <br />Colorado pikeminnow '" 250 mm TL; complete task within 50 days after <br />starting. Sampling occurred in spring. <br /> <br />Task 3. After first year, analyze data, consult with statistician, and alter sampling design <br />if necessary. <br /> <br />FY 2002 Annual Report 22j Page - 2 <br />