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.
The Influence of Hypoxia on the Preferred Temperature of Rainbow Trout Oncorhynchus Mykiss
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H. SCHURMANN, J. F. STEFFENSEN, J. P. LOMHOLT; The Influence of Hypoxia on the Preferred Temperature of Rainbow Trout Oncorhynchus Mykiss. J Exp Biol 1 May 1991; 157 (1): 75–86. doi: https://doi.org/10.1242/jeb.157.1.75
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