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Results <br />Adult Fish <br />During the two-year study, 13 adult humpback chub were captured (12 potentially <br />unique fish and 1 definitive recapture), two by trammel net, five by electrofishing, and <br />six by supplemental angling data (Table 2). On release, all fish seemed fully recovered <br />and swam away. Adult sampling effort during two years was 258 hours of electrofishing, <br />1,917 hours of angling, and 557 hours of trammel netting. Effort by time and gear varied <br />by canyon reach (Table 1). Mean length of humpback chub from our study was 279 mm <br />TL (Figure 2). This varied from the previous study of Haines and Modde (2002; 245 mm <br />TL) but was similar to earlier collection data (Karp and Tyus 1990; 278 mm TL). <br />All adult fish were captured in Yampa Canyon or the upstream end of Whirlpool <br />Canyon (Table 2) where previous investigators had captured humpback chub (See Miller <br />et al. 1982, Karp and Tyus 1990, Modde and Haines 2002). Catch per unit of effort of <br />adult humpback chub was dramatically lower than in previous years (Table 3). One <br />possible humpback chub was captured between rkm 0 and 8 in Yampa Canyon, within <br />the range of the population, however it was outside of recent capture locations. Trained <br />staff did not have the opportunity to positively confirm the identity of this fish prior to its <br />release, however it was within the current known population range. <br />Juvenile Fish <br />A total of 47 juvenile samples were collected during the study, 12 in 2003 and 35 <br />in 2004. A total of 13,379 fish were collected in these samples. Three hundred and <br />7 <br />