The Environmental Regulation of Reproduction in Cat Fish (Clarias Batrachus) With Special Reference to the Role of Photoperiod

Abstract

Development, growth and reproduction are influenced by daily and seasonal variations of photoperiod in teleost fish. Experiments were carried out to investigate the environmental regulation of reproduction in cat fish (Clarias batrachus) with special reference to the role of photoperiod. The effect of the photoperiod and temperature regimes on reproductive function was assessed by GSI and histological techniques. The Photo regimes taken up for the study were; 5hr L / 19 hr D at 22 0 C ,9 hr L / 15 hr D at 22 0 C and 18hr L / 6 hr D at 22 0 C. The results reveal the advancement in reproduction of fishes by changing