Preliminary studies on the effects of light duration on the growth and performance of Clarias gariepinus fingerlings

Odunze, F.C. and Ibiwoye, T.I.I. and Ladu, B.M.B. and Iyolyoon, P.A. (2003) Preliminary studies on the effects of light duration on the growth and performance of Clarias gariepinus fingerlings. In: 16th Annual Conference of the Fisheries Society of Nigeria (FISON) , 4-9 November 2001 , Maiduguri, Nigeria.

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Abstract

The effects of light duration on the growth and performance of Clarias gariepinus fingerlings were investigated using artificial methods to simulate continuous day length and absolute darkness. The normal day length (12-H Light and 12-H Darkness) served as the control. Among some of the factors affected by the varying photoperiods there were body coloration, feeding efficiency, survival rate and Specific Growth Rate (SGR). There was notably no significant difference between the SGR of the 0-photoperiod culture and the control (P>0.05) but there was significant difference between the 0-photoperiod and the 24-H photoperiod experiment (P<0.05). The haematological profile analysed showed various degrees of changes in the blood parameters of fish cultured under different photoperiods. These changes however, did not show significant differences when subjected to statistical analysis

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