Endogenous lunar rhythm in the behavioural thermoregulation of a teleost fish, the white sucker,Catostomus commersoni

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Abstract
The white sucker, Catostomus commersoni, displays a diel rhythm of behavioural thermoregulation in a horizontal thermal gradient. Under LD 12: 12 single fish select significantly higher temperatures in the scotophase than in the photophase. An endogenous lunar rhythm exists in the absolute and maximum and minimum temperatures selected. Significantly higher temperatures (+2°C) are selected at the times of the new moon than at the times of the full moon. This provides the first demonstration of an endogenous lunar rhythm in the thermoregulatory behaviour of a vertebrate.