Abstract
Abstract A method is presented for determining the 24-hour chronology of feeding intensity in natural populations of fishes based upon stomach food analyses and digestion rate experiments. The method is illustrated by studies on a population of young black bullheads. Two distinct feeding periods are recognized, the major peak occurring just before dawn, and a minor peak shortly after dark. Little food of any kind is taken during the middle of the day or around midnight. Although several sources of error are currently recognized, the method should eventually prove valuable in the quantitative analysis of aquatic food chains.
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