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<br />~ <br /> <br />e <br /> <br />Tyus and Nikirk-Abundance, growth, and diet of Ietalums punctatus <br /> <br />197 <br /> <br />June 1990 <br /> <br />ularly in rocky canyon habitats. Growth of catfish <br />was slow in this area relative to that in other <br />regions, but the sheer weight of its numbers in- <br />dicated that establishment of channel catfish in <br />the Green River basin is permanent. However, <br />its preference by anglers is low relative to that <br />for trout, and its greatest abundance occurs in <br />virtually inaccessible canyons. Recovery of the <br />endangered Colorado River fishes has not yet in- <br />cluded thorough investigations of potential inter- <br />actions with channel catfish even though they are <br />sympatric in specific microhabitats. Habitat mod- <br />ifications (e.g., flow regulation, thermal changes) <br />that may favor growth and further proliferation <br />of channel catfish in the Green River basin must <br />be carefully evaluated with respect to potential <br />adverse impacts on native fishes. <br /> <br />This work was funded by the U.S. Bureau of Rec- <br />lamation and the U.S. Fish and Wildlife Service. Many <br />employees of the U.S. Fish and Wildlife Service par- <br />ticipated in data collection. C. A. Karp, L. A. Trinca, <br />and others assisted in the identification of fish stomach <br />contents. M. H. Hughes, D. A. Adriansen, K S. De- <br />venport, and D. A. Strejc assisted in sectioning, pol- <br />ishing, and reading spines. We thank R. A. Whaley <br />for reading sample catfish spines. C. A. Karp and G. <br />B. Haines helped with statistical analyses. C. A. Karp, <br />W. G. Layher, and an anonymous reviewer improved <br />an earlier version of the manuscript. <br /> <br />LITERATURE CITED <br /> <br />\.. <br /> <br />ALLEN, R. C., AND D. L. RODEN. 1978. Fish of Lake <br />Mead and Lake Mohave. Nevada Dept. Wild!., <br />Bio!' Bull., 7:1-105. <br />ANDREWS, J. W., AND R. R. STICKNEY. 1972. In- <br />teractions of feeding rates and environmental tem- <br />perature on growth, food conversion, and body com- <br />position of channel catfish. Trans. Amer. Fish. Soc., <br />101:94-99. <br />BAILEY, R. M., AND H. M. HARRISON, JR. 1948. <br />Food habits of the southern channel catfish (lctalu- <br />rus lacustris punctatus) in the Des Moines River, <br />Iowa. Trans. Amer. Fish. Soc., 75:110-138. <br />BANKS, J. L. 1964. Fish species distribution in Di- <br />nosaur National Monument during 1961 and 1962. <br />Unpub!. M.S. thesis, Colorado State Univ., Fort <br />Collins, 96 pp. <br />CANFIELD, H. L. 1947. Artificial propagation of those <br />channel cats. 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