Over-summering behaviour of Atlantic salmon Salmo salar returning to rivers in the Cromarty Firth, north–east Scotland

Authors

  • D. C. Stewart,

    Corresponding author
    1. Fisheries Research Services, Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5LB, Scotland, U.K.
      *Tel.: +44 (0) 1796 472060; fax: +44 (0) 1796 473523; email: d.c.stewart@marlab.ac.uk
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  • S. J. Middlemas,

    1. Fisheries Research Services, Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5LB, Scotland, U.K.
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  • S. Mackay,

    1. Fisheries Research Services, Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5LB, Scotland, U.K.
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  • J. D. Armstrong

    1. Fisheries Research Services, Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5LB, Scotland, U.K.
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*Tel.: +44 (0) 1796 472060; fax: +44 (0) 1796 473523; email: d.c.stewart@marlab.ac.uk

Abstract

In 2005, a high percentage (50%) of Atlantic salmon Salmo salar fitted with acoustic transmitters, which entered rivers in the Cromarty Firth area of north–east Scotland dropped back to the estuary and ascended adjacent rivers after 33–80 days of freshwater residence. Fish residing in non-natal rivers generate mixed stock fisheries, and movements of fish between rivers could increase the risk of disease transmission between catchments.

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