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Journal of Experimental Biology 157,75-86 (1991)
Published by Company of Biologists 1991

The Influence of Hypoxia on the Preferred Temperature of Rainbow Trout Oncorhynchus Mykiss

H. SCHURMANN ¹, J. F. STEFFENSEN ², and J. P. LOMHOLT ¹

¹ Department of Zoophysiology, University of Aarhus DK-8000 Aarhus
² Marine Biological Laboratory, University of Copenhagen DK-3000 Helsingør, Denmark

To whom reprint requests should be addressed.

The behavioural thermoregulation of rainbow trout Oncorhynchus mykiss was investigated in a shuttlebox at normoxia and at three levels of hypoxia: 13.3, 9.3 and 5.3 kPa. The final preferred temperatures at normoxia, and at 13.3, 9.3 and 5.3 kPa, were 16.1, 14.9, 15.0 and 12.7°C, respectively. A decreased rate of metabolism and an increased blood oxygen-affinity are among the physiological advantages of selecting a lower temperature during hypoxia. It is suggested that catecholamines may play a part in controlling temperature selection during hypoxia. In natural environments, this behaviour may result in habitat shifts of fish living in heterothermal environments with changing oxygen tensions.

Key words: hypoxia, rainbow trout, preferred temperature, Oncorhynchus mykiss

Accepted on December 17, 1990

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