Journal of Experimental Biology · 2025
Evidence that tolerance of acute warming declines with increasing body mass within fish species
In four populations of farmed and wild fish (European sea bass, Nile tilapia, gilthead seabream), spanning roughly 20 to 800 g, tolerance of acute warming declines with body mass. Heavier individuals appear more sensitive to acute heat stress than lighter ones.
- The question
- Within a species, do larger fish cope less well with rapid warming?
- The approach
- Temperature of fatigue during sustained aerobic exercise (CTSmax protocol) and maximum oxygen uptake measured in farmed sea bass and tilapia and in wild sea bass and seabream.
- What the article brings
- Warming tolerance declines significantly with mass in all populations, and is positively correlated with the maximum oxygen uptake reached before fatigue.
- The limits
- The protocol does not reveal a greater size-related cardiorespiratory limitation than at usual temperatures: the mechanisms behind the decline remain to be clarified.
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