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~ ~ ~ ~ 1^ - <br />r <br />Introduction and Background r'~~ ~ ,~i I~ ~ <br />~' ; ~ <br />~ ~ ~~ . . <br />Colorado squavfish, razorback suckers and Colorado fiver chubs <br />(Gila spp.) are all known to have occurred in the San Jean River his- ~' <br />f; <br />torically (Jordan, 1889, Olson, 1962, Buzeau of Indian Affairs, 1976, <br />VTN,1918). Presently, the Colorado squavfish, and the bonytail and <br />h~pback chub are alI listed as endangered by the II.S. Pish and Nild-- <br />life Service, while the razorback sucker remains a candidate species <br />for listing. Since the closure of Navajo and Glen Canyon Dams in the <br />early 1960's, however, reports of these rare fish have been f ew and <br />sporadic. Verified reports of Colorado squawfis6 frost the San Juan <br />River occurred in 1965 near Bloomfield, New tiezico (Sublette, 1977a), <br />in 1977 from the San Juan arm of Lake Powell (OSFf~S,i981), and most <br />currently near Aneth, IItah, in 1978 (VTN, 1978). The bonytail chub has <br />been reported to occur in Lake Powell (Hinckley, 1973), but there have <br />been no recent verified reports of humpback chubs in the San Juan River <br />drainage. Roundtail chubs, listed by the State of New Mezico as <br />endangered, have been collected from several San Jnan River tributaries <br />downstream of Navajo Dam including the Animas River in 1975 and La <br />Plata River in 1976 (Sublette, 1977b), and the Mancos River in 1975 <br />(Jensen, 1975, Robertson, 1977) as well as the San 3uan River in 1977 <br />(Sublette, 1977a). The razorback sucker has been reported near Bluff, <br />Utah (VTN, 1978), and from the San Juan arm of Lake Powell in 1977 <br />(USFHS, 1981), and seasonally in the Spring from 1981 to 1984 (_personal <br />communication. O tah Division of Wildlife Resources). <br />1 <br />