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Sub‐lethal temperature thresholds indicate acclimation and physiological limits in brook trout Salvelinus fontinalis
Author(s) -
Morrison Scott M.,
Mackey Theresa E.,
Durhack Travis,
Jeffrey Jennifer D.,
Wiens Lilian M.,
Mochnacz Neil J.,
Hasler Caleb T.,
Enders Eva C.,
Treberg Jason R.,
Jeffries Ken M.
Publication year - 2020
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.14411
Subject(s) - salvelinus , fontinalis , acclimatization , trout , biology , zoology , fish <actinopterygii> , ecology , fishery
The upper thermal tolerance of brook trout Salvelinus fontinalis was estimated using critical thermal maxima (CT max ) experiments on fish acclimated to temperatures that span the species' thermal range (5–25°C). The CT max increased with acclimation temperature but plateaued in fish acclimated to 20, 23 and 25°C. Plasma lactate was highest, and the hepato‐somatic index ( I H ) was lowest at 23 and 25°C, which suggests additional metabolic costs at those acclimation temperatures. The results suggest that there is a sub‐lethal threshold between 20 and 23°C, beyond which the fish experience reduced physiological performance.