Thyroxine: Effect on Behavioral Thermoregulation in Fishes
Canadian Journal of Zoology
Exposure to thyroxine in the ambient water significantly lowered the preferred temperatures of two fish species. Acute exposure to thyroxine at a concentration of 20 μg/L of water lowered the preferred temperature by approximately 2 °C, while chronic exposure to the same concentration for 14 days prior to testing lowered the preferred temperature by as much as 10 °C. Chronic exposure for 14 days to thiourea (0.33 g/L), a thyroxine antagonist, raised the preferred temperature by 2.6 °C. These results suggest a role of thyroid hormones in thermoregulatory behavior of ectothermic vertebrates.
William W. Reynolds, Martha E. Casterlin, and Richard E. Spieler. 1982. Thyroxine: Effect on Behavioral Thermoregulation in Fishes .Canadian Journal of Zoology , (5) : 926 -928. https://nsuworks.nova.edu/occ_facarticles/195.