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r ~ <br />_- ~ T ~ <br />rainbow trout (Salmo gairdneri) were responsible for a 20~o relative <br />-- decline in native fish abundance. Species diversity (TU index) values <br />increased both above and below the reservoir basin due to non-native <br />species expansion, and a leveling amongst the resident species <br />abundances. An unknown portion of the flannelmouth sucker population <br />apparently vacated the tailrace area in response to reduced temperature <br />and turbidity.- Evidence for this was based on a lower than expected <br />incidence of recapture, lower total catch rates and increased <br />individual net movement following completion of Taylor Draw Dam. <br />Thomas E. Chart <br />Department of Fishery and <br />Wildlife Biology <br />Colorado State University <br />Fort Collins, Colorado 80523 <br />Summer 1987 <br />iv <br /> <br />