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<br /> <br />of 284 razorback suckers in the Grand Junction area from 1974 to 1976. <br />However, very few were collected during the late 1980's (summarized by <br />Osmundson and Kaeding 1990). Although some of this decline may be related to <br />habitat change at the Walker Wildlife Area where Kidd (1977) and McAda and <br />Wydoski (1980) collected most of their fish and to decreased sampling <br />intensity, the abrupt population decrease appears real. Intensive sampling by <br />the Fish and Wildlife Service and Colorado Division of Wildlife in ?_989 and <br />1990 collected only 3 razorback suckers in the Colorado River (Kaeding and <br />Osmundson 1990; Bob Burdick, personal communication). Wiltzius (1978) <br />collected one razorback sucker from the Gunnison River in 1975, but Valdez et <br />al. (1982a) did not collect any during 1979 to 1981. Although razorback <br />suckers are not presently found in the Gunnison River above Redlands Diversion <br />Dam, suitable habitat still remains (E. Wick, personal communication). <br />Humpback chub <br />No historical distribution and abundance data exist for humpback chub <br />because the species-was not described until 1946 (Miller 1946). Humpback chub <br />were first collected in the upper Colorado River in 1974 at Black Rocks, <br />upstream from the Utah-Colorado border (B. Burdick, personal communication). <br />Additional populations were later discovered in Westwater and Cataract canyons <br />(Valdez et al. 1982b). Recent studies (Kaeding et al. 1990) suggest that the <br />populations are small and disjunct, but relatively stable. Although Valdez et <br />al. (1982a) extensively sampled the Iower Gunnison River from 1979 to 1981, <br />they did not collect any humpback chub. <br />8 <br />