Farmed Atlantic salmon Salmo salar L. parr may reduce early survival of wild fish |
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| Authors: | L. Sundt‐Hansen J. Huisman H. Skoglund K. Hindar |
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| Affiliation: | 1. Norwegian Institute for Nature Research (NINA), N‐7485 Trondheim, Norway;2. Department of Biology, Norwegian University of Science and Technology, N‐7491 Trondheim, Norway;3. Laboratory of Freshwater Ecology and Inland Fisheries (LFI‐Uni Environment), Uni Research, N‐5006 Bergen, Norway |
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| Abstract: | 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. |
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| Keywords: | aquaculture competition density dependence juvenile salmonids survival |
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