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Lack of metabolic thermal compensation during the early life stages of ocean pout Zoarces americanus (Bloch & Schneider) : a benthic, cold-water marine species

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The present study investigated the metabolic response of young ocean pout Zoarces americanus to temperature acclimation (3 v. 11° C), and to acute changes in water temperature from 3 to 17° C. The Q10 value for standard metabolic rate between acclimation temperatures was 5·3, warm-acclimated fish displayed higher rates of oxygen uptake at all temperatures during the acute thermal challenge, and changes in whole-body citrate synthase activity were qualitatively similar to those seen for metabolism. These results indicate that, in contrast to temperate species, young ocean pout from Newfoundland do not show thermal compensation in response to long-term temperature changes.

Keywords: Zoarces americanus; acclimation; metabolism; temperature; thermal compensation

Document Type: Research Article


Affiliations: Ocean Sciences Centre and Department of Biology, Memorial University of Newfoundland, St John’s, Newfoundland, A1C 5S7 Canada

Publication date: 2008-02-01

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