Farmed Atlantic salmon Salmo salar L. parr may reduce early survival of wild fish

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 signif...

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Bibliographic Details
Published in:Journal of Fish Biology
Main Authors: Sundt‐Hansen, L., Huisman, J., Skoglund, H., Hindar, K.
Other Authors: Norwegian Environment Agency, Research Council of Norway
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2015
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Atlantic salmon
Salmo salar
Online Access:http://dx.doi.org/10.1111/jfb.12677
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.12677
https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.12677
Description
Summary: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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