Abstract
Twenty-seven juveniles of the African mud catfish, Clarias gariepinus, were reared in triplicate under three different photoperiods: 24 hours total darkness (00L: 24D), 6 hours light and 18 hours darkness (6L: 18D) and 12 hours light and 12 hours darkness (12D:12L) as control. The effects of light duration on the growth, body coloration, and feed conversion efficiency of the juveniles were investigated. The result showed significant (P <0.05) increases in body weight, specific growth rate, and food conversion efficiency in fish cultured under 00L: 24D, followed by 06L: 18D, while those under 12L: 12D (control group) showed the least growth increase. The high growth, increase recorded in the 00L:24D was attributed to better food conversion efficiency and the suppression of swimming activity, aggression, and stress in the dark. Visual observation of the skin coloration of
fish indicated that those subjected to photoperiod regime A (00L: 24D) were darker and black in appearance. Those subjected to photoperiod regime B (06L: 18D) had a lighter grey appearance, while in the case of photoperiod regime C (12L: 12D) had the normal dark grey coloration on the dorsal part with light grey scattered along the sides. The final mean body weight of the males was significantly different from that of the females in
the entire experimental period with the final mean body weight of 57.60±3.86g and 47.41±1.31g for the males and females respectively.
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