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Binns (1965, 1967) suggested that the razorback sucker was the <br />rarest fish observed during this operation. Concentrations <br />regularly occurred in the mouth of the Yampa River near the Green <br />River confluence (Holden and Stalnaker 1975a, Holden and Stalnaker <br />1975b, Seethaler et al. 1979, McAda and Wydoski 1980). <br />Pre- and post-impoundment Flaming Gorge Reservoir studies <br />documented the disappearance of the razorback sucker and some <br />other native fishes from the Green River upstream of the Yampa <br />River after closure of Flaming Gorge Reservoir in 1962 (Banks <br />1964, Vanicek et al. 1970, Stalnaker and Holden 1973, Holden and <br />Crist 1979). Sigler and Miller (1963} also noted declining <br />abundance of the razorback sucker throughout its range in the <br />UCRB. <br />Razorback sucker presently occupy a portion of their former <br />range in the Green River from the Green-Colorado River confluence <br />upstream into the lower 21 km of the Yampa River (Tyus 1987, Tyus <br />and Karp 1989). Razorback suckers remain rare in the upstream <br />reaches of the Yampa River; only two specimens were captured among <br />many thousands of adults of other fish species collected since <br />1977 (Wick et al. 1979, Wick et al. 1981, Wick et al. 1982, Wick <br />et al. 1985, Wick et al. 1986). Small concentrations of razorback <br />-- <br />suckers are still present at the mouth of the Yampa River (Tyus <br />1987, Lanigan and Tyus 1989, Tyus and Karp in press). In the <br />upper Green River, Utah, the razorback sucker is most abundant <br />from the mouth of the Duchesne River upstream to the Yampa River. <br />Tyus (1987) captured 323 specimens from 1979 to 1986 in this area. <br />24 <br />