Abstract
The use of exogenous hormones to induce final oocyte maturation, ovulation, and spawning has becomecommonplace in the reproductive protocols for many species. In the present study, African catfish (Clarias gariepinus)were monthly collected from January to December 2011 for studying their monthly reproductive biology. Also,hormonal stimulation was done using ovaprim, human chorionic gonadotropin (hCG), and salmon gonadotropinreleasing hormone analog (GnRHa). However, fish (337.2 – 718.0 g) were divided into seven groups (each groupcontained four females and four males) and injected into the dorsal musculature by 0.4, 0.5 ml kg -1 Ovaprim, 1000,3000 IU kg -1 hCG, and 0.75, 1 ml kg -1 GnRHa. The control group was injected by 0.9% saline. At the dosage tested,gonado-somatic index (GSI), absolute fecundity, ovulation index, egg diameter, fertilization rate were significantlyaffected in all stimulated groups. It was found that the hormonal treatments are a useful method for commercial Africancatfish breeders to ensure the continuity of access larvae. However, the best reproductive performance was obtained at0.5 ml kg -1 ovaprim, 3000 IU kg -1 hCG, and 0.75 ml kg -1 GnRHa.
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