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The upper critical thermal limits for alevins of Arctic charr from a Norwegian lake north of the Arctic circle

Authors

  • J. M. Elliott,

    Corresponding author
    1. Department of Marine and Freshwater Biology, The Norwegian College of Fishery Science, University of Tromsø, N-9037 Tromsø, Norway
    2. Freshwater Biological Association, Windermere Laboratory, The Ferry House, Far Sawrey, Ambleside, Cumbria LA22 0LP, U.K.
      ‡Author to whom correspondence should be addressed. Tel.: +44 15394 42468; fax +44 15394 46914; email: jmel@ceh.ac.uk
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  • A. Klemetsen

    1. Department of Marine and Freshwater Biology, The Norwegian College of Fishery Science, University of Tromsø, N-9037 Tromsø, Norway
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‡Author to whom correspondence should be addressed. Tel.: +44 15394 42468; fax +44 15394 46914; email: jmel@ceh.ac.uk

Abstract

Mean values ±95% CL of the upper incipient (TIL) and ultimate (TUL) lethal temperatures, determined at five acclimation temperatures (TA), increased for TIL from 19.2 ± 0.4° C (TA 0.5° C) to 21.0 ± 0.4° C (TA 20° C), and for TUL from 22.6 ± 0.1° C (TA 0.5° C) to 26.6 ± 0.4° C (TA 20° C). Mean values were close to those obtained for Arctic charr alevins from Windermere (north-west England). These comparative data for alevins, and previous data for 0+ year parr, indicate negligible geographical variation in the thermal limits of Arctic charr.

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