Burst and coast use, swimming performance and metabolism of Atlantic cod Gadus morhua in sub-lethal hypoxic conditions

Prolonged swimming capacity (critical swimming speed, Ucrit, protocol) and metabolism were measured for 14 Atlantic cod Gadus morhua exposed to seven oxygen levels within the non‐lethal range normally encountered in the Gulf of St Lawrence (35 to 100% saturation). Burst‐and‐coast swimming was trigge...

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Bibliographic Details
Published in:Journal of fish biology 2007-08, Vol.71 (2), p.363-375
Main Authors: Dutil, J.-D., Sylvestre, E.-L., Gamache, L., Larocque, R., Guderley, H.
Format: Article
Language:English
Subjects:
Atlantic cod
Brackish
burst and coast
Gadus morhua
hypoxia
Marine
oxygen consumption
swimming
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Summary:Prolonged swimming capacity (critical swimming speed, Ucrit, protocol) and metabolism were measured for 14 Atlantic cod Gadus morhua exposed to seven oxygen levels within the non‐lethal range normally encountered in the Gulf of St Lawrence (35 to 100% saturation). Burst‐and‐coast swimming was triggered earlier (at lower speeds) in hypoxia, and burst‐and‐coast movements were more frequent in hypoxia than in normoxia at low speeds. Furthermore, the metabolic scope beyond the metabolic rate at which Atlantic cod resorted to burst‐and‐coast movements decreased gradually as ambient oxygen concentration dropped. Overall, fewer burst‐and‐coast movements were observed in hypoxia while the distance swum in burst‐and‐coast mode remained c. 1% of the total distance swam in all tests. Oxygen availability had no effect on the rate of increase in metabolic rate with increasing velocity
ISSN:0022-1112
1095-8649
DOI:10.1111/j.1095-8649.2007.01487.x