Induction of Ovulation by HCG, LHRHa and Carp Pituitary in Rhynchocypris oxycephalus (Sauvage and Dabry)

摘要

The effectiveness of human chorionic gonadotropin (HCG), a super active analogue of mammalian luteinizing hormone leleasing hoimone (LHRHa) and carp pituitary (CP) for inducing ovulation in Rhynchocypris oxycephalus (Sauvage and Dabry) was examined, and the effects of the maternal hormone treatment on egg quality were evaluated. None of the control group and sham (saline injected) control group ovulated. The majority (76-96%) of the hormone-treated groups ovulated within 2 days after hormone injection. Studies of egg quality e.g , fertilization rate and hatching, demonstrated that good quality R. oxycephalus (Sauvage and Dabry) offspring can be produced after accelerated spawning by HCG, LHRHa and CP. The increase in egg diameter and number of eggsspawned may have been caused by the increase in the body weight of the females.