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Lethal oxygen levels at diferent temperatures and the preferred temperature during hypoxia of the Atlantic cod, Gadus morhua L.
Schurmann, H.; Steffensen, J.F. (1992). Lethal oxygen levels at diferent temperatures and the preferred temperature during hypoxia of the Atlantic cod, Gadus morhua L. J. Fish Biol. 41: 927-934
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112, more
Peer reviewed article  

Available in Authors 

Keywords
    Hypoxia; Temperature preferences; Gadus morhua Linnaeus, 1758 [WoRMS]; Marine

Authors  Top 
  • Schurmann, H.
  • Steffensen, J.F.

Abstract
    The behavioural thermoregulation of Atlantic cod Gadus morhua L. was investigated in a shuttlebox at normoxia and at three levels of hypoxia: 30, 20 and 15% oxygen saturation.The preferred temperatures at normoxia, 30, 20 and 15% oxygen saturation were 13·9, 13·1. 10·0 and 8·8° C, respectively.A decrease in metabolism and an increased blood oxygen affinity are among the physiological advantages of selecting a lower temperature during hypoxia. Furthermore the chances of surviving low oxygen saturations are better at low temperatures.In natural environments, this behaviour may result in habitat shifts of fish living in heterothermal environments with changing oxygen saturations, especially in coastal areas with eutrophication, as for example the Baltic Sea.

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