Dissertation/Thesis Abstract

The effects of invasive brook trout removal on native Colorado River cutthroat trout in a small headwater stream in northeastern Utah
by Birchell, Garn J., M.S., Utah State University, 2007, 75; 1448031
Abstract (Summary)

We evaluated the response of Colorado River cutthroat trout to brook trout removal from a small headwater stream in Northeastern Utah. Complete eradication was not achieved, so periodic removal of brook trout will be needed to maintain the cutthroat population.

Statistically significant increases in relative weight (Wr) values for cutthroat trout were observed. Relative weight values for all size groups of brook trout increased significantly between pre and post removal periods. We captured cutthroat trout that exhibited site fidelity, mobility, and a combination of the two behaviors. Cutthroat trout shifted from selecting species in the order Tricoptera in 2003 to species in the order Plecoptera in 2004. During both years we examined diet Diptera species were selected. If complete eradication is not the goal or if circumstances dictate depletion removal electrofishing is the only alternative, depletion removal may be useful for maintaining low abundances of brook trout.

Indexing (document details)
Advisor: Budy, Phaedra
School: Utah State University
School Location: United States -- Utah
Source: MAI 46/02M, Masters Abstracts International
Subjects: Ecology, Aquaculture, Fish production
Publication Number: 1448031
ISBN: 9780549217985
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