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Colorado squawfish (Marsh 19$5). Cold summer tail waters have <br />displaced Colorado squawfish in areas downstream from Glen Canyon <br />Dam {Suttkus and Clemmer 1979, Holden and Stalnaker 1975b, Carothers <br />and Minckley 1981). Cold water has also eliminated the species from <br />areas downstream from Flaming Gorge Dam (Vanicek and Kramer I969). <br />Despite evidence that large dams are responsible for Colorado <br />squawfish population declines, other factors may also be important. <br />Preimpoundment surveys of Flaming Gorge of the Green River (Bosley <br />1960, Gaufin et al. 1960), Glen Canyon of the Colorado River, (Smith <br />1959, McDonald and Dotson 1960}, and Navajo Basin of the San Juan <br />River (Olsen 1962) indicate that Colorado squawfish were rare in <br />those areas before these dams were built. <br />Abnormally large cold flows. in late summer appear detrimental to <br />Colorado squawfish reproductive success (Jones and Tyus 1985) in <br />contrast to large flows in spring. Colorado squawfish were <br />relatively scarce in the Green River during 1983 and 1984- years of <br />very high cold summer flows. These flaws also eliminated most <br />ephemeral backwater larval habitats. <br />Reduced flows by dams,- consumption, and diversion may have <br />caused Colorado squawfish spawning and nursery backwater areas to be <br />lost (Sinning and Andrew 1979, Holden and Wick 1982). The quality <br />and availability of spawning areas may be a limiting factor for <br />Colorado squawfish (Miller et al. 1982c). Holden and Wick (1982) <br />compared numbers of Colorado squawfish caught by others (Tabs et al. <br />1965, Holden and Stalnaker 1975b, Kidd 1977, Valdez et al. 1982b), <br />12 <br />