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r.1~~n~1 Cane<~ii, 'and reduced humpbacl: chub distribution to the area <br />.~.~_._ <br />around the Little Colorado River confluence (Suf-t""' ""d "l`''~''"cr <br />1979). <br />Ci1~r populations in the Green River hive declined in <br />recent years. Humpback chubs existed in Flaming Gorge Basin before <br />Flaming Gorge Dam was built (Gaufin et al. 1960), but native <br />fishes were eliminated by rotenone poisoning (Miller 1963) and <br />habitat loss in the reservoir basin (Holden 1973). Roundtail chub <br />and bonytail persisted downstream in Dinosaur National Monument <br />after closure of Flaming Gorge Dam (Vanicek and Kramer 1969). <br />Further downstream, roundtail chubs were "common" between Jenson and <br />Ouray, UT; and humpback chubs were "common" between Sand Slash-anti <br />Green River, UT (::olden 1978}. Gi18 are rare in most areas of <br />the Green River today (Tyus et a1. 1982). Only one suspected <br />bonytail has been captured there since 1982 (Tyus et a1. 1987). <br />Today humpback chubs populations are found in widely separated <br />river areas in the Upper-and Lower Colorado River Basin (Archer cat <br />a1. 1985). Humpback chub populations exist in the Little Colorado <br />River, Grand Canyon, Arizona (Suttkus~ and Clemmer 1979); and in the <br />Colorado River at Black Rocks in Colorado and Westwater Canyon in <br />Utah (Valdez I980). Humpback chubs may also inhabit the Colorado <br />River in Debeque Canyon east of Crand Junction, CO (Valdes and <br />Clemmer I982). Ci1a specimens from there appeared intermediate <br />between roundtail chubs and hiimYt~r~ck chubs; nave possessed the <br />extreme morphologic-al features attributed to humpback chubs. <br />5 <br />