The effect of thermal acclimation on aerobic scope and critical swimming speed in Atlantic salmon, Salmo salar

The Journal of Experimental Biology
Malthe HvasFrode Oppedal

Abstract

The Atlantic salmon is extensively studied owing to conservation concerns and its economic importance in aquaculture. However, a thorough report of their aerobic capacity throughout their entire thermal niche has not been described. In this study, Atlantic salmon (∼450 g) were acclimated for 4 weeks at 3, 8, 13, 18 or 23°C, and then tested in a large Brett-type swimming respirometer in groups of 10 per trial. Both standard metabolic rate and active metabolic rate continued to increase with temperature, which resulted in an aerobic scope that also increased with temperature, but was statistically similar between 13, 18 and 23°C. The critical swimming speed peaked at 18°C (93.1±1.2 cm s-1), and decreased significantly at the extreme temperatures to 74.8±0.5 and 84.8±1.6 cm s-1 at 3 and 23°C, respectively. At 23°C, the accumulated mortality reached 20% over 4 weeks, while no fish died during acclimation at colder temperatures. Furthermore, fish at 23°C had poor appetite and lower condition factor despite still having a high aerobic scope, suggesting that oxygen uptake was not the limiting factor in the upper thermal niche boundary. In conclusion, Atlantic salmon were able to maintain a high aerobic capacity and good swimming capab...Continue Reading

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Citations

Apr 7, 2018·The Journal of Experimental Biology·Clinton J MoranAlice C Gibb
Jul 11, 2020·The Journal of Experimental Biology·Daniel F Gomez IsazaCraig E Franklin
May 23, 2020·Journal of Fish Biology·Alexander G LittleFrank Seebacher
Jan 20, 2021·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Kathleen A HittleDavid J Coughlin
Feb 12, 2019·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Robine H J LeeuwisAnthony K Gamperl
Jul 3, 2021·Animals : an Open Access Journal From MDPI·Ricardo CaladoMiguel C Leal
Sep 11, 2021·Frontiers in Physiology·Anthony K GamperlRebeccah M Sandrelli

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