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<br />' deposited over cobble bars and develop in interstitial spaces for four to six d at temperatures of <br />18 to 26°C (Hamman 1981, Bestgen and Williams 1994). Following incubation, larvae hatch and <br />are transported by river currents 40 to 200 km or more downstream to low-gradient reaches <br />' where they occupy shallow low-velocity backwaters at the channel margin until fall (Haynes et <br />al. 1984, Haines and Tyus 1990, Tyus and Haines 1991). <br />' Reduced distribution and abundance of Colorado squawfish throughout the Colorado <br />River basin is likely due to both disruption of physical habitat and negative interactions with non- <br />' native fishes (Vanicek and Kramer 1969, Holden 1979, Carlson and Muth 1989, Stevens et al. <br />1995). Mainstem dams block migration routes, inundate riverine habitat, and modify natural <br />' discharge patterns and water temperatures in downstream reaches. Over 40 fish species have <br />been introduced in the upper Colorado River basin (Carlson and Muth 1989), many of which may <br />' compete with, or prey upon, early life stages of Colorado squawfish. <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />