Effect of stocking sub-yearling Atlantic salmon on the habitat use of sub-yearling rainbow trout

Journal of Great Lakes Research
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Abstract

Atlantic salmon (Salmo salar) restoration in the Lake Ontario watershed may depend on the species' ability to compete with naturalized non-native salmonids, including rainbow trout (Oncorhynchus mykiss) in Lake Ontario tributaries. This study examined interspecific habitat associations between sub-yearling Atlantic salmon and rainbow trout as well as the effect of salmon stocking on trout habitat in two streams in the Lake Ontario watershed. In sympatry, Atlantic salmon occupied significantly faster velocities and deeper areas than rainbow trout. However, when examining the habitat use of rainbow trout at all allopatric and sympatric sites in both streams, trout habitat use was more diverse at the sympatric sites with an orientation for increased cover and larger substrate. In Grout Brook, where available habitat remained constant, there was evidence suggesting that trout may have shifted to slower and shallower water in the presence of salmon. The ability of sub-yearling Atlantic salmon to affect a habitat shift in rainbow trout may be due to their larger body size and/or larger pectoral fin size. Future studies examining competitive interactions between these species during their first year of stream residence should consider the size advantage that earlier emerging Atlantic salmon will have over rainbow trout.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effect of stocking sub-yearling Atlantic salmon on the habitat use of sub-yearling rainbow trout
Series title Journal of Great Lakes Research
DOI 10.1016/j.jglr.2015.11.002
Volume 42
Issue 1
Year Published 2016
Language English
Publisher Elsevier
Contributing office(s) Great Lakes Science Center
Description 11 p.
First page 116
Last page 126
Country United States
State New York
Other Geospatial Orwell Brook; Grout Brook
Online Only (Y/N) N
Additional Online Files (Y/N) N
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