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Production potential of shingi, Heteropneustes fossilis and koi, Anabas testudineus in polyculture were assessed at a stocking density of 2, 47,000 and 3, 70,500 ha -1 , respectively in treatment T1 and T2. Monoculture of H. fossilis and A. testudineus was designed at a stocking density of 2, 47,000 ha -1 in treatment T3 and T4, respectively. Culture period of shingi was 120 days and koi was 100 days in all treatments. All fingerlings were of the same age at stocking, with a mean weight of 2.54±0.08 g for shingi and 0.50±0.01 g for koi, respectively. Commercial fish feeds (30.0% crude protein) supplied at the rate of 100 to 5% of total biomass twice daily. Fish production in treatment T1, T2, T3 and T4 were 18,803±111, 12,388±115, 10,042±5 kg ha -1 day -120 and 22,176±7 kg ha -1 day -100 , respectively. The feed conversion ratio (FCR) was significantly (P<0.05) lower in T4 than that of the other three treatments. The net financial benefits incurred from treatment T1, T2, T3 and T4 were Bangladeshi Taka 17, 65,769; 6,691; 15,83,990 and 16,29,409 BDT ha -1 , respectively. The mean differences of gross yields and net benefits among different treatments were significant (P<0.05). The polyculture technology of shingi and koi, and monoculture technology of koi may help to meet the dietary needs and improve the socio-economic status of the people of Bangladesh.

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Growth and survival of Pangasianodon hypophthalmus was assessed in relation to feeding of different feeds for a rearing period of 21 days. The experiment was designed with 3 treatments and 4 replications. The nursery ponds were stocked at a density of 0.6 million hatchling/ha with 3days old P. hypophthalmus. The highest growth performance, survival and production of the fry was found in treatment T in terms of length, weight and number, where sustainable nursery management was 1 implemented and egg yolk, mustard oil cake, nursery feed and Tubifex Chop were supplied. Poor growth performance and survival was recorded in treatment T where nursery management was poor 3, with insufficient food supply. The highest average growth was recorded at 5.66±0.55 g, SGR 12.24±0.68, FCR 0.68±0.01and survival rate 52.15±0.78% in the treatment T. The treatment (T) 1 1 also showed highest economic return (Bd Tk. 290543/ ha) than that of treatment T and T. The 1 2 physico-chemical factors were found to be in optimum level for fish culture.