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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