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<br />accomplished as part of the Recovery Program's annual field trip. Fish were collected with one <br /> <br />electrofishing raft. The second trip was June 19-21, and two electrofishing rafts were used. The <br /> <br /> <br />third trip was June 26-28, and fish were collected with two electrofishing rafts. <br /> <br /> <br />Each sampling pass through Yampa Canyon took 3-4 days of electrofishing and angling <br /> <br /> <br />and one additional day for travel downstream to the takeout. Subsequent passes were made 7-10 <br /> <br /> <br />d later. <br /> <br />Juvenile sampling. Juvenile humpback chub were captured primarily by seining, but a <br /> <br />few were captured by electrofishing. In 1998, one trip (August 3-7) was devoted entirely to <br /> <br /> <br />capturing juvenile humpback chub. Sampling consisted of seining shallow riffles, eddies, pools <br /> <br /> <br />and runs from river km 60 to 17. Numbers offish captured, length, river kilometer, and area <br /> <br /> <br />seined by habitat were recorded. Shoreline electro fishing by wading was done in 1998 and 1999, <br /> <br />primarily in boulder and eddy habitats known to contain adult humpback chub. Seine collection <br /> <br />sites were chosen opportunistically, i.e., backwater and eddy habitats that could be waded. <br /> <br />Shoreline electrofishing was conducted near areas in which Gila have been observed to spawn <br /> <br />(e.g., Five Springs Rapid, Little Joe Rapid, etc.). <br /> <br />Historical data. Humpback chub data collected by the Colorado River Fish Project at <br /> <br />Vemal, Utah, in previous studies in Yampa Canyon (i.e., field station data records from <br /> <br />1985-1997) were used to supplement this study. Some of these data were presented in Karp and <br /> <br />Tyus (1990). <br /> <br />5 <br />