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Not AvailableRecent advances in fish endocrinology have led to a better understanding of the hormones involved in control of gamete production, mode of action and regulation of their secretion during different stages of reproductive cycle. Environmental stimuli like photoperiod and temperature are perceived by the brain which releases gonadotropin releasing hormone (GnRH) that binds specifically to receptors in the pituitary gonadotrops and stimulates secretion of gonadotropic hormones (GtH-I & II). The circulating gonadotropins stimulate gonadal (ovarian and testicular) development and final maturation. GtH-I induces synthesis and secretion of estradiol-17β in previtellogenic phase of ovarian growth leading to vitellogenesis or yolk production while during post-vitellogenic phase, GtH-H triggers synthesis of 17α,20β-dihydroxy-progesterone (17,20-P) which is responsible for the final maturation leading to ovulation and spermiation. Role of nutrition in broostock management for quality seed production in fishes has been appreciated during the recent years. The artificial propagation technique being employed presently needs constant refinement for obtaining quality fish seed at the desired times of the year. Altering sexual cycles, induction of advanced, delayed maturation and multiple breeding, ovulation, spermiation and artificial fertilization of the commercially important species need to be refined where nutritive and reproductive physiology might help for faster progress in aquaculture. Role of reproductive pheromones in gonadal maturation, synchronization of reproductive processes and spawning as well as reproductive containment of invasive species may not be overlooked. In this communication, the importance of nutrition in broodstock management for better quality gamete output and recent advances in hormonal biotechnology in aquaculture with particular reference to the cultured Indian major carps and catfishes have been discussed.Department of Biotechnology (DBT), Government of Indi