Summary
Sunfish (Lepomis cyanellus) and goldfish (Carassius auratus) acclimated to 5°, 15° and 25 °C were placed individually in a horizontal temperature gradient from 2° to 30 °C where the fish could swim freely. They spent large proportions of time (70%) at temperatures near their acclimation temperature and avoided the extremes. By behavioral selection, internal body temperature was maintained relatively constant. After bilateral medial and lateral preoptic lesions, fish spent random amounts of time at all temperatures available in the gradient and did not maintain a stable body temperature.
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Support from grants NSF PCM 76-15861 and HEW PHS GM 7143 is acknowledged.
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Nelson, D.O., Prosser, C.L. Effect of preoptic lesions on behavioral thermoregulation of green sunfish, Lepomis cyanellus, and of goldfish, Carassius auratus . J. Comp. Physiol. 129, 193–197 (1979). https://doi.org/10.1007/BF00657653
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DOI: https://doi.org/10.1007/BF00657653