Abstract
Fish fed daily at a regular time under controlled artificial illumination became active daily for a number of hours just before feeding time. Experiments with killifish ( Fundulus heteroclitus) in constant light and under alternating 12-hour periods of bright and dim light showed that the timing of the pre-feeding activity is influenced by shifts in the light cycle and feeding time; when feeding time in constant light was shifted 6 hours, the pre-feeding activity shifted approximately 6 hours in 1 to 3 days. The conclusion was reached that the pre-feeding activity is a consequence of conditioning the act of feeding to an endogenous cue which itself is coordinated by the time of feeding or daily changes in light.
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