Journal
JOURNAL OF FISH BIOLOGY
Volume 87, Issue 3, Pages 763-773Publisher
WILEY
DOI: 10.1111/jfb.12736
Keywords
Arrhenius breakpoint temperature; C-Tmax; ECG; heart rate; optimum temperature; restricted ration
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Funding
- Canadian Regulatory System for Biotechnology
- NSERC
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In coho salmon Oncorhynchus kisutch, no significant differences in critical thermal maximum (c. 269 degrees C, C-Tmax) were observed among size-matched wild-type, domesticated, growth hormone (GH)-transgenic fish fed to satiation, and GH-transgenic fish on a ration-restricted diet. Instead, GH-transgenic fish fed to satiation had significantly higher maximum heart rate and Arrhenius breakpoint temperature (mean +/- s.e. = 173 +/- 01 degrees C, T-AB). These results provide insight into effects of modified growth rate on temperature tolerance in salmonids, and can be used to assess the potential ecological consequences of GH-transgenic fishes should they enter natural environments with temperatures near their thermal tolerance limits.
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