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Interactions of slimy sculpin (Cottus cognatus) with native and nonnative trout: Consequences for growth

Canadian Journal of Fisheries and Aquatic Sciences

By:
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DOI: 10.1139/F06-054

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Abstract

We examined growth of native slimy sculpin (Cottus cognatus), native brook trout (Salvelinus fontinalis), and nonnative brown trout (Salmo trutta) to investigate potential interactions of a native nongame fish with native and nonnative trout. Enclosures (1 m2) were stocked with five treatments (juvenile brown trout with sculpin, juvenile brook trout with sculpin, and single species controls) at three densities. Treatments (with replication) were placed in riffles in Valley Creek, Minnesota, and growth rates were measured for six experiments. We examined the difference in growth of each species in combined species treatments compared with each species alone. We did not find evidence of interactions between brook trout and sculpin, regardless of density or fish size. However, sculpin gained greater mass when alone than with brown trout when sculpin were >16 g. Likewise, brown trout grew more when alone than with sculpin when brown trout were >24 g. In contrast, brown trout ???5 g grew more with sculpin compared with treatments alone. We suggest that native brook trout and sculpin coexist without evidence of competition, whereas nonnative brown trout may compete with sculpin. ?? 2006 NRC.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Interactions of slimy sculpin (Cottus cognatus) with native and nonnative trout: Consequences for growth
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
DOI:
10.1139/F06-054
Volume
63
Issue:
7
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1526
Last page:
1535
Number of Pages:
10