Location: Warmwater Aquaculture Research Unit
2012 Annual Report
For hybrid catfish production, hormonal manipulations need to be used as a management tool to enhance the efficiency of gamete production and hatchery operations. Pertinent aspects for its effectiveness relating to type of hormone, dosage, mode and frequency of administration need to be evaluated. Hormone-induced spawning of channel catfish is technically feasible and economically viable method to produce hybrid catfish fry in commercial hatcheries.
Synthetic hormones are more efficacious than natural gonadotropin hormones to induce spawn fish. Salmon Gonadotripn releasing hormone analog sGnRHa – a potent hormone was evaluated for its efficacy (0, 5, 10 and 25 µg/Kg BW) to induce spawn channel catfish. Based on a spawning trial, minimum effective hormone dose was identified as 10 µg/Kg body weight (BW) and the collaborator has applied for sponsoring this peptide under Investigational New Animal Drug program. Individual fish were held in soft mesh bags during the hormone treatment and the responses measured include the percent of maturation of oocytes, ovulation, egg quality, relative fecundity and hatch. Plasma profiles of cortisol, estradiol and progesterone at 0 and 20 hours will provide the progress of gonadal development. Data collected from producers will further refine the efficacious dose of hormone as suspension delivery to channel catfish.