Author(s): Md. Golam Sajed Riar, Nur- A Raushon, Parvez Chowdhury and Md. Khalilur Rahman

Abstract: Growth performance and survival of Tor putitora spawn under different stocking densities were evaluated in primary nursery management system during the period from 16 November to 6 December 2018. The experiment was carried out in six earthen ponds of 0.02 ha each under three treatments with two replications. Five day old hatchlings were stocked at the rate of 0.50 million/ha was designated as treatment- 1 (T₁), 0.75 million/ha` as treatment- 2 (T₂) and 1.00 million/ha as treatment- 3 (T₃), respectively. Spawns were fed with commercially available nursery feed containing 39.80% crude protein. It was observed that, lower stocking density showed highest daily weight gain in T₁ (growth 0.05 g/day) followed by higher stocking density in T₂ (growth 0/031 g/day) and T₃ (growth 0.024 g/day), respectively. It is also noticed that, the lower stocking showed the highest survival rate (74%) than the other two treatments. The values of different water quality parameters were within the optimum ranges for the nursery rearing of carp fry. Water quality parameters did not show significant variations in the experimental ponds under different stocking densities. Among the three stocking densities lower stocking density (T₁) showed the best result compare with the other two higher stocking densities.

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