Homoplastic hypophysation of African catfish, Clarias gariepinus

Résumé

Clarias gariepinus brood stocks (137.0 6.0g) were hypophysised for maturation and ovulation with Clarias crude pituitary extract (CCPE) at 7 mg/kg body weight of female fish. Fertilization was done by mixing egg and mill together in a dry bowl with feather. Physico-chemical parameters of water were maintained at 6.0 +0.2 mg/l (dissolved oxygen), 28.0 +0.5°C (temperature) and 7.2, 0.1 (pH). The latency period recorded for optimal egg was 10-12 hours. While hatching started at 24 hours to 36 hours. The total number of eggs stripped was 618.8 10, the total fertilized was 332.8 x 10', the total fry hatched was 280.6 x 10%. It is concluded that C. gariepinus can be induced with CCPE to reduce the cost of carp pituitary and problem of its procurement due to scarcity.