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a <br />- ~~ ~, <br />2 <br />but not documented until 1981 in the Yampa and Green Rivers of Colorado <br />and Utah (Tyus et al. 1984), the Colorado squawfish was the species <br />most obviously affected by Taylor Draw Dam as a barrier to fish <br />movements. <br />The regulated White River differs from other regulated systems <br />described in the literature (Ward and Stanford 1979; Lillehammer and <br />Saltveit 1984; Petts 1984). The Tayllor Draw Dam project is relatively <br />smal] and the dramatic shifts in thiermal and flow regime, typically <br />observed below larger bottom releasing dams are lacking. <br />The study of fisheries in regulated streams has followed two major <br />disciplines. The first deals with the consequence of a dam obstructing <br />upstream and downstream migrations of fish. Rlong these lines, much <br />attention has been directed to anadromous salmonid fishes (Raymond <br />1968; Trefethen 1972; Dominy 1973; Netboy 1974); paddlefish (Branson <br />1974); striped bass (Nichols 1968) and sturgeon (Zakharyan 1972). The <br />second area of research is concerned with the altered physical <br />environment below the~dam and the associated impact to the resident <br />fish community. Typically native species are eliminated or reduced <br />below bottom releasing dams (Pfitz~er 1967; Vanicek 1970; Spence and <br />Hynes 1971; Edwards 1978; Swink and Jacobs 1983) as result of an <br />altered thermal regime. <br />In the present study, larval, juvenile and adult fishes <br />were sampled above and below the reservoir two years prior and one year <br />subsequent to the completion of the Taylor Draw project. The main <br />objective of this study was to determine to what extent mainstream <br />impoundment impacted the resident fish community. To realize this <br />objective, several environmental parameters were monitored, the results <br />%- <br />