STUDY ON BREEDING PERFORMANCE, SURVIVAL AND GROWTH PERFORMANCE OF COMMON CARP (Cyprinus carpio L.) IN FISH FARM OF DHANUSHA DISTRICT, NEPAL

Though Common carp is one of the most widely cultured species in Nepal, there is insufficient supply of fry and fingerlings of common carp. Therefore, the study was conducted with the objective to observe the breeding performance, survival and growth of common carp. Two consecutive experiments were conducted during February to May 2020. First experiment was conducted in four nursery ponds having same area (30m×17m) to observe the breeding performance and growth of hatchlings. 24 kakabans were kept in each pond and brood females and males were released in each pond in a ratio of 1:2 (female: male) i.e. 7 female and 14 male. Each brood fishes were injected with Luteinizing Hormone Releasing Hormone (LHRH A2) @ 2µg/kg body weight for female and @ 1µg/kg body weight to male for induced breeding of common carp. The experimental duration was of 36 days. Second experiment was also conducted in 4 nursery ponds having same area (30m×15m) to observe the survival of fry and the experimental duration was of 50 days. There was no significant difference in water quality parameters (p>0.05) and feeding among the research ponds during the culture period. Water quality parameters were measured on weekly basis. Periodic samplings were done to evaluate the daily weight gain, specific growth rate, survival rate and change in water quality parameters. The average weight gain, daily weight gain and specific growth rate of hatchlings were 0.54 g, 0.02 g/fish/day and 12.16%/day respectively. Similarly the average weight gain, daily weight gain and specific growth rate of fry were 20.43g, 0.41g/fish/day and 7.32%/day respectively. And the average survival rate of common carp fry in fish farm of Dhanusha was 47% at stocking density of 56, 000/ha. Through induced breeding process, the average number of fry produced from 7female having average total weight 19 kg and 14 male having average total weight 28 kg was 1, 38,750.