Routine and Active Metabolic Rates of Migrating Adult Wild Sockeye Salmon (Oncorhynchus nerka Walbaum) in Seawater and Freshwater

Wagner, G. N., Kuchel, L. J., Lotto, A., Patterson, D. A., Shrimpton, J. M., Hinch, S. G. and Farrell, A. P. (2006) Routine and Active Metabolic Rates of Migrating Adult Wild Sockeye Salmon (Oncorhynchus nerka Walbaum) in Seawater and Freshwater. Physiological and Biochemical Zoology, 79 1: 100-108. doi:10.1086/498186

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Author Wagner, G. N.
Kuchel, L. J.
Lotto, A.
Patterson, D. A.
Shrimpton, J. M.
Hinch, S. G.
Farrell, A. P.
Title Routine and Active Metabolic Rates of Migrating Adult Wild Sockeye Salmon (Oncorhynchus nerka Walbaum) in Seawater and Freshwater
Journal name Physiological and Biochemical Zoology   Check publisher's open access policy
ISSN 1522-2152
Publication date 2006
Sub-type Article (original research)
DOI 10.1086/498186
Open Access Status File (Publisher version)
Volume 79
Issue 1
Start page 100
End page 108
Total pages 9
Place of publication Chicago, Ill.
Publisher University of Chicago Press
Language eng
Subject 0608 Zoology
Abstract We present the first data on the differences in routine and active metabolic rates for sexually maturing migratory adult sockeye salmon (Oncorhynchus nerka) that were intercepted in the ocean and then held in either seawater or freshwater. Routine and active oxygen uptake rates (Mo2) were significantly higher (27%–72%) in seawater than in freshwater at all swimming speeds except those approaching critical swimming speed. During a 45‐min recovery period, the declining postexercise oxygen uptake remained 58%–73% higher in seawater than in freshwater. When fish performed a second swim test, active metabolic rates again remained 28%–81% higher for fish in seawater except at the critical swimming speed. Despite their differences in metabolic rates, fish in both seawater and freshwater could repeat the swim test and reach a similar maximum oxygen uptake and critical swimming speed as in the first swim test, even without restoring routine metabolic rate between swim tests. Thus, elevated Mo2 related to either being in seawater as opposed to freshwater or not being fully recovered from previous exhaustive exercise did not present itself as a metabolic loading that limited either critical swimming performance or maximum Mo2. The basis for the difference in metabolic rates of migratory sockeye salmon held in seawater and freshwater is uncertain, but it could include differences in states of nutrition, reproduction, and restlessness, as well as ionic differences. Regardless, this study elucidates some of the metabolic costs involved during the migration of adult salmon from seawater to freshwater, which may have application
Keyword Physiology
Zoology
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
 
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