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Journal of Freshwater Ecology Volume 9, 1994 - Issue 1
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Original Articles

Use of Drifting Invertebrates by Young-Of-Year Brown Trout in Stream-Margin Habitat

William J. LaVoie IV U. S. Fish and Wildlife Service, Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming, Laramie, Wyoming, 82071-3166
&
Wayne A. Hubert U. S. Fish and Wildlife Service, Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming, Laramie, Wyoming, 82071-3166
Pages 37-43 | Received 04 Nov 1993, Accepted 18 Dec 1993, Published online: 06 Jan 2011
 
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ABSTRACT

We studied the feeding dynamics of young-of-year (YOY) brown trout (Salmo trutta) inhabiting stream-margin habitat of a mountain stream during August and September. We found invertebrates in fish stomachs throughout 24-h sampling periods. The abundance of items in stomachs increased with the density of drifting invertebrates after dark. Composition of stomach contents and composition of drifting invertebrate samples were related, but Ephemeroptera larvae had positive electivity indices more frequently than other taxa. The mean lengths of invertebrates in stomachs were greater than those in samples of drifting invertebrates.

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