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

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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 inter actions 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.

Nous étudions la croissance du chabot visqueux (Cottus cognatus) indigène, de l'omble de fontaine (Salvelinus fontinalis) indigène et de la truite brune (Salmo trutta) non indigène afin de déterminer les interactions potentielles entre un poisson sportif indigène avec des salmonidés, l'un indigène et l'autre non indigène. Nous avons empoissonné des enclos (1 m2) selon cinq combinaisons (jeunes truites brunes et chabots, jeunes ombles de fontaines et chabots et témoins des trois espèces isolées) à trois densités différentes. Les expériences (en double) ont été conduites dans des zones rapides de Valley Creek, Minnesota; nous avons mesuré les taux de croissance dans six expériences. Nous avons calculé les différences de croissance de chaque espèce élevée en compagnie d'une autre et élevée seule. Nous n'avons trouvé aucun signe d'interaction entre l'omble de fontaine et le chabot, quelles que soient les densités et les tailles des poissons. Cependant, lorsque les chabots ont une masse >16 g, ils atteignent des masses plus grandes seuls qu'en compagnie de truites brunes. De même, les truites brunes de masse >24 g croissent davantage seules qu'en présence de chabots. En revanche, les truites brunes ≤5 g croissent davantage en présence de chabots que seules. Nous pensons que les ombles de fontaines et les chabots indigènes cohabitent sans indication de compétition, alors que les truites brunes non indigènes peuvent entrer en compétition avec les chabots.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2006

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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