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Feeding Time Differentially Affects Fattening and Growth of Channel Catfish^{1, 2,}

Milwaukee Public Museum, Milwaukee, WI 53233 ^* U.S. Fish and Wildlife Service, Southeastern Fish Cultural Laboratory, Marion, AL 36756

Channel catfish (Ictalurus punctatus) were held on a 12-h light, 12-h dark photoperiod (light onset 0600 h) and fed a nonpurified diet daily at either 0730 or 1600 h or a half ration at both of these times of day. The feeding tim conducive to total growth (0730 h) differed from that conducive to fattening (1600 h). Fish fed a half ration at both times of day had body weights similar to those fed a single early meal but also had high abdominal fat weights similar to those fed a single late meal. Feeding schedule appears to be an important factor in determining the metabolic fate of nutrients.

KEY WORDS: • circadian • feeding time • fattening • growth

¹ Supported in part by the National Institute of Arthritis, Diabetes, Digestive and Kidney Diseases of the National Institutes of Health AM 25919 and National Institute of Environmental Health Sciences Aquatic Biomedical Center ESO1985.

² Presented in part at the Rhythmicity in Fishes Symposium, University of Wisconsin-Milwaukee, 20 August 1983.

Manuscript received 5 September 1984. Revision accepted 4 June 1985.