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Goldfish Carassius auratus were maintained on a 12L:12D (12‐hour‐light:12‐hour‐dark) photoperiod at 14 C and fed 1% of body weight once daily for 3 weeks. The fish had differences in growth depending on the feeding time relative to the light‐dark cycle: Fish fed 18 hours after light onset (6 hours into darkness) grew more than others. Common carp Cyprinus carpio were maintained on a 16L:8D photoperiod at 15 C and fed 2% of body weight at one of six feeding times for 5 months. There were no consistent growth differences among treatments, nor any apparent debilitating effects of long‐term enforced feeding times on common carp. The feeding time most conducive to body‐weight gain appears to vary with the season and among cultured fish species. Timing the daily meal may be a valuable tool for aquaculture.

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