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Colorado. McAda and Wydoski (1980) also sampled the Walker <br />Wildlife Area from 1974-1976 (Table 1); 66 razorback suckers <br />captured comprised 3.4 ~ of all fish caught. Razorback sucker <br />captures reported by Kidd (1977) and McAda and Wydoski (1980) <br />were not duplicated in their respective reports (pers. comm., C. <br />McAda, U. S. Fish and Wildlife Service), as was suggested by <br />Minckley et al. (in press). Some of these fish represent <br />recaptures; the exact number is unknown. <br />From 1979 to 1982, 86 razorback suckers were collected in <br />the Colorado River from Rifle, Colorado, to Lake Powell (Valdez <br />et al. 1982a, summary in Osmundson and Kaeding in review); 69 <br />were collected from the Grand Valley, Grand Junction, Colorado <br />and most of those from the Walker Wildlife Area and another <br />gravel pit near Clifton, Colorado. From 1985 to 1988, only 12 <br />razorback suckers were collected in a 53-km reach of the Colorado <br />River in the Grand Valley (Osmundson and Kaeding 1989a, in <br />review), where it was less common than the federally endangered <br />Colorado squawfish. The Walker and Clifton area gravel pit ponds <br />in the Grand Valley, Colorado, which formerly held large numbers <br />of razorback suckers (Kidd 1977), were altered by floods in 1983 <br />and 1984 (Osmundson and Kaeding 1989a). These habitats now <br />consist of small backwaters, secondary channels, or have been <br />diked from the river and are not accessible. The fate of <br />razorback suckers that formerly occupied these gravel pit ponds <br />is unknown. Only one adult razorback sucker (555 mm TL) <br />20 <br />