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Table 1. Study objectives for Flaming Gorge Dam winter flow fluctuations on overwinter survival of <br />voune-of-vear Colorado Dikeminnow. <br />Objectives: Overwinter Survival and Movement of Young-of-Year Colorado Addressed in:' <br />Pikeminnow Component <br />Determine if overwinter survival of age-0 Colorado pikeminnow was affected by A <br />winter operations of Flaming Gorge Dam. <br />Determine if backwater habitats are physically affected by fluctuating releases from A <br />Flaming Gorge Dam during winter. <br />Determine if winter movements are related to fluctuating releases from Flaming A <br />Gorge Dam. <br />Evaluate the assumptions of overwinter survival estimates and specifically determine A <br />how Colorado pikeminnow movements affect these estimates <br />Evaluate alternative methods for collecting age-0 Colorado pikeminnow in A <br />backwater, embayments, eddy, and main-channel shoreline habitats during the <br />winter. <br />Objectives: Movement Rates under Simulated Winter Conditions Component <br />Describe the realistic range of spontaneous movement rates (activity) of age-0 B <br />Colorado pikeminnow in simulated winter conditions. <br />Objectives: Bioenergetics Model Component <br />Construct a bioenergetics model that describes energetics of age-0 Colorado C <br />pikeminnow in winter conditions. <br />Evaluate the potential for overwinter survival of age-0 Colorado pikeminnow to be C <br />influenced by changes in fish activity. <br />' Reports are referenced as follows: A - Kitcheyan and Haines 2004; B - Plampin and Beyers 2004; and C - Beyers <br />and Plampin 2004. <br />METHODS <br />Overwinter Survival and Movement of Young-of-Year Colorado Pikeminnow <br />Abundance Estimates and Overwinter Survival <br />Each year abundance estimates were conducted in autumn and again in spring using capture- <br />recapture methods (Haines and Modde 1996; Haines et al. 1998). Abundance estimates for autumn and <br />spring were computed using the computer program CAPTURE (White et al 1982). Our original study <br />plan called for three sampling passes between Bonanza Bridge and Ouray Bridge, a 40-mile reach. <br />Vi