Journal
JOURNAL OF FISH BIOLOGY
Volume 86, Issue 6, Pages 1699-1712Publisher
WILEY-BLACKWELL
DOI: 10.1111/jfb.12677
Keywords
aquaculture; competition; density dependence; juvenile; salmonids; survival
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Funding
- Norwegian Environment Agency
- QuantEscape knowledge platform of the Research Council of Norway
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The study examined the density-mediated effects on growth, survival and dispersal of wild and farmed Atlantic salmon Salmo salar offspring in the period immediately following emergence, using a substitutive design. In small confined stream channels, wild parr coexisting with farmed parr had a significantly poorer survival, than wild parr alone. Density did not affect this relationship. In larger unconfined stream channels, wild parr coexisting with farmed parr entered a downstream trap in higher numbers than wild parr in allopatry. The results suggests that during the earliest life stages, farmed S. salar can outcompete wild S. salar, resulting in a reduced survival of wild S. salar. (C) 2015 The Fisheries Society of the British Isles
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