Author(s): Md. Bayezid Bostami, Mst Shahina Akter, Hasna Banu, Mahmud Hasan and Md. Al-Amin Sarker

Abstract: The research work was conducted to investigate the effect of stocking density on nursery rearing of Common carp (Cyprinus carpio var spicularis) spawn reared in hapa The experiment was carried out with three treatments group each having three replicates at Puthia fish seed production farm, Rajshahi. The Common carp spawn were collected from the same hatchery. Three different treatment with the stocking density was maintained at 400/m³ (T_1, SD4), 600/m³ (T₂, SD6) and 800/m³ (T₃, SD8). Spawn were fed diet blend boiled egg yolk for 1-4 days and semi-solid wheat bran (50%) and mustard oil cake (50%) were fed remaining the study period. The physico-chemical characteristics such temperature (°C), transparency (cm), dissolved oxygen (mg/l) and pH of the pond water were monitored around the study period. All the tested water quality parameter were in acceptable limit for fry rearing. Growth performance, production of Common carp fingerling and benefit cost analysis (BCR) were studied. The weight gain and specific growth rate (SGR%, bwd/day) were significantly higher (P<0.05) in SD4 fish groups than SD6 and SD8 groups. The mean value of weight gain (g) was 17.955±0.17^ag (SD4), 15.995±0.20^bg (SD6) and 14.825±0.15^cg (SD8_­). The survivability at the end of the rearing of fingerling was significantly higher in SD4 (56.47±6.94^a %) group than SD6 (50.80±2.40^ab %) and SD8 (42.99±1.37^b %) groups. However, the total yield of Common carp fingerling was higher in SD8 group than other groups. Yet, the BCR was significantly (P<0.05) higher in SD4 (1.97± 0.00^a) group than SD6 (1.81± 0.00^b) and SD8 (1.72± 0.01^c) groups. Stocking density of 400 spawn m³ exhibited significantly higher profit of Common carp in hapa net in pond among the treatment.

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