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bb <br />The Walter Walker Wildlife area was sampled August 10 and 16-17, 1979 <br />to assess its use by the endangered fishes. A total of 61.5 trammel <br />net hours yielded 1 squawfish and 1 razorback sucker. Carp,,black <br />bullheads, and green sunfish dominated the fish fauna. <br />Black Rocks wassampled in August, October, and November 1979. Electro <br />l <br />fishing and trammel nets were the most effective gears used, although <br />the latter was used sparingly to avoid killing any fish. A;'total of <br />29 Colorado squawfish and 90 humpback chub were captured, tagged, and <br />released in the 1 mi section of river. Although most of these fishes <br />were adults, sufficient numbers of young and juveniles were caught <br />in Black Rocks or nearby to provide evidence of reproduction. <br />For brood stock collection, three adult squawfish were captured in the <br />Green River near the Jensen Bridge in the first effort. Two were <br />caught by electrofishing and the third was taken in a trammel net. <br />Ini a second effort, four adult squawfish, caught in a single trammel <br />net, were taken from the Colorado River about 25 miles upstream from <br />Moab, Utah. These seven squawfish were transported to the Willow Beach <br />National Fish Hatchery, Arizona. <br />The third effort at capturing brood stock occurred at Black Rocks. <br />A total of 20 adult humpback chub were captured for transport to Willow <br />Beach. These fish were all captured with trammel nets in 15 to 45 <br />feet of water after electrofishing failed to yield any fish. -Prior <br />to this brood stock collecting effort, electrofishing had proven quite <br />effective in taking chubs in the Black Rocks area. <br />No mortalities were observed in any fish handled in this brood fish <br />capture program.