An experiment was conducted to evaluate the breeding performance in Clarias batrachus (130±1.32 g) at different HCG dose and latency period combinations. The breeding performance was judged through weight of stripped egg (g) and stripping response {weight of stripped egg/(weight of stripped egg+weight of stripped ovary)}. The females injected with 1000-3000 IU HCG per kg body weight could not be stripped at 11 h latency. The weight of stripped eggs increased gradually with the increase of latency period in both 1000 and 2000 IU dose level. Smooth stripping and free flow of eggs were observed when stripped at 3000 and 4000 IU dose levels in combination with 14-23 h latency periods but a significant decrease (P<0.05) in egg was observed at 5000 IU and 17-23 h latency combination. The stripping response was the highest at 3000 and 4000 IU in combination with 14-23 h latency period. The injection of 3000-4000 IU HCG dose per kg female weight in combination with 14-23 h latency was suitable to get good stripping response for the highest weight of stripped egg in C. batrachus during induced breeding operation.
___
Adebayo, O.T. and Fagbenro, O.A. 2004. Induced ovulation and spawning of pond raised African giant catfish, Heterobranchus bidorsalis by exogenous hormones. Aquaculture, 242: 229-236.
Areerat, S. 1987. Clarias culture in Thailand. Aquaculture, 63: 355-362.
Hogendoorn, H. and Vismanas, M.M. 1980. Controlled propagation of the African catfish Clarias lazera (C and V). II. Artificial reproduction. Aquaculture, 21: 39-53.
Legendre, M. and Oteme, Z. 1995. Effect of varying latency period on the quantity and quality of ova after hCGinduced ovulation in the African catfish, Heterobranchus longifilis (Teleostei, Clariidae). Aquatic Living Resources, 8: 309-316.
Legendre, M., Slembrouck, J., Subagja, J. and Kristanto, H. 2000. Ovulation rate, latency period and ova viability after GnRH- or hCG-induced breeding in the Asian catfish Pangasius hypophthalmus (Siluriformes, Pangasidae). Aquatic Living Resources, 13: 145-151.
Sahoo, S.K., Giri, S.S. and Sahu, A.K. 2006. Induced spawning of Asian catfish, Clarias batrachus (Linn.): effect of various latency periods and SGnRHa and domperidone doses on spawning performance and egg quality. Aquaculture Research, 36: 1273-1278
Snedecor, G.W. and Cochran, W.G. 1967. Statistical methods. Iowa State University Press, Ames, Iowa, USA.
Tan-Fermin, J.D., Pagador, R.R. and Chavez, R.C. 1997. LHRHa and pimozide-induced spawning of Asian catfish Clarias macrocephalus (Gunther) at different times during an annual reproductive cycle. Aquaculture, 148: 323-331.
Thakur, N.K. and Das, P. 1986. Synopsis of biological data on magur, Clarias batrachus (Linnaeus, 1785). CIFRI Bulletin, 41: 1-42.
Zonneveld, N., Rustidja, W.J., Viveen, A.R. and Maduna, W. 1988. Induced spawning and egg incubation of the Asian catfish, Clarias batrachus. Aquaculture, 74: 41 47.