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28 <br />• degree, possibly giving them a reproductive advantage under historic <br />hydrographic conditions. <br />Reproductive success. <br />Colorado squawfish <br />o Spring flows near historic conditions are correlated with Colorado squawfish <br />reproductive success in the Yampa River Basin. <br />Tyus and Karp (1989) reported Colorado squawfish spawning success in <br />the Yampa River to be highly correlated with spring flows unaltered by <br />water development projects. They attributed the continued presence of <br />the rare fishes in the Green River below the mouth of the Yampa River to <br />• the essentially natural hydrograph of the Yampa River. <br />Holden and Crist (1978, 1981) suggested that alterations in the natural <br />hydrograph were affecting reproductive success of Colorado squawfish. <br />Actual mechanisms involved were reported as unknown, however. <br />Holden (1980a, b) reported years of low flows to be limiting Colorado <br />squawfish spawning habitat in the Yampa River. <br />Archer (1984), Archer and Tyus (1984), Archer et al (1984), Miller et al. <br />(1983b), and Holden and Crist (1978, 1981) pointed out that reproductive <br />success of Colorado squawfish was greater in the Green River Basin <br />than in the Upper Colorado mainstem even though habitat is similar. <br />0