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<br />have peen aiscovered only once in the Lolorau~ nlvc~ ~.vtviauv <br />squawfish larvae in this river are widely distributed, indicating <br />ti - <br />that spawning probably occurs in several areas between Clifton CO <br />and Cataract Canyon, UT. Spawning requirements may be met at many <br />' locations along the river.; if so, spawning migrations would not be <br />necessary and aggregations might not be expected. <br />Spawning requirements and egg survival <br />Colorado squawfish spawning times coincide with receding flows <br />and rising water temperatures in summer (Vanicek and Kramer 1969, <br />Haynes et al. 1984 and 1985, Archer et al. 1985). Colorado ' <br />squawfish spawned in July through August or early September in the <br />Colorado and Yampa rivers in recent years (Archer et al. 1985, <br />Haynes et al. 1985). Spawning is delayed by suppressed river <br />temperatures during high flow years (Wick et al. 19$3) and occurs <br />earlier in .downstream reaches than in upstream ones (Archer et al. <br />1985). Colorado squawfish spawn in water temperatures of 20 to 22 C <br />(Vanicek and Kramer 1969, Holden 1973, Toney 1974, Hamman 1981, Tyus~ <br />and McAda 1984). Spawning in the Yampa River occurred at a range of <br />18 to 25, with peak activity occurring at 22 to 25 C (Haynes et al. <br />1985). <br />Colorado squawfish spawning sites are characterized by deep <br />pools and eddies in close proximity to riffles and deep runs (Archer <br />and Tyus 1984). ~ Yools or large shoreline eddies are used as staging <br />areas where the fish may rest, feed, or congregate. Egg deposition <br />and fertilization occurs in riffles over cobble substrates.. <br />9 <br />