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Coho salmon haematological, metabolic and acid‐base changes during exercise and recovery in sea water

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Cannulated, seawater‐acclimated coho salmon Oncorhynchus kisutch were swum to exhaustion in a seawater tunnel (10° C, mean Ucrit 50 cm s−1), resulting in metabolic acidosis and increased plasma electrolyte and cortisol concentrations, which were corrected during a 4 h recovery. Because the swimming and physiological performance data were similar to those of other salmonids, it was concluded that life‐history limitations, besides their exercise capabilities in upwelling zones, probably explain declining coho salmon populations.

Keywords: Oncorhynchus kisutch; acid‐base; conservation; exercise recovery; ionic regulation; respiration

Document Type: Regular Paper


Affiliations: 1: Department of Wildlife, Fish, and Conservation Biology, University of California, Davis, Davis, California, 95616, U.S.A. and 2: Department of Zoology, 6270 University Boulevard, University of British Columbia, Vancouver, B.C., V6T 2A9, Canada

Publication date: November 1, 2004


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