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21 <br />intensive sampling area, but only 3 percent outside the intensive <br />site. Channel catfish relative abundance was 23 percent within the <br />intensive and 33 percent in other samples. Adult collections in <br />1984 within the spawning area can best be compared with 1982 CDOW <br />collections by Wick et al. (1985), the only previous year of adult <br />collections by CDOW in this river section. In 1982, Colorado <br />squawfish were the most abundant species collected by netting from <br />RMI 19.7-16.1 in Yampa Canyon, comprising 36 percent of the fish <br />sampled (Figure 7). A greater percentage of squawfish may have <br />been collected in 1982 because an additional five floating net <br />pulls were made in areas where squawfish were thought to be <br />spawning (based on radiotelemetry observations). Another notable <br />difference between 1982 and 1984 collections was the greater <br />percentage of channel catfish and roundtail chub present in 1984 <br />samples. In 1984, approximately half the channel catfish were in <br />the juvenile size category which could be detrimental to adult <br />squawfish which may attempt to take them as prey. A squawfish was <br />collected in 1984 with a juvenile (174 mm TL) catfish lodged in its <br />throat. The catfish was removed and the squawfish released alive. <br />McAda (1983) noted three deaths apparently due to channel catfish <br />entrapment by Colorado squawfish. <br />Upper Yampa River, August 1984. <br />On August 14-16, 1984, 970 fish were collected from Government <br />Bridge, Juniper Springs, Maybell, Sunbeam and Lilly Park sampling <br />areas (Figures 8 and 9). Overall catch-per-unit-effort (CPUE) was <br />231 fish/hour, only slightly greater than the 197 fish/hour <br />recorded for the same areas later in October. Dominant species <br />collected were bluehead sucker, flannelmouth sucker, roundtail