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<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 />
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