Author(s): Md. Abu Sayed Jewel, Md. Akter Hossain, Md. Afzal Hussain and Md. Golam Mehedi Hasan

Abstract: Species Suitability for fish farming in irrigated rice-fish culture system of drought prone barind area were evaluated on the basis of production performance and cost analysis for a period of 4 months. Three most commonly used fish species were tested under three treatments (T₁: Nile tilapia- Oreochromis niloticus; T₂: Thai Sarpunti- Barbodes gonionotus and T₃: carpio- Cyprinus carpio) in rice-fish culture system of drought prone Barind area to find out suitable fish species. The fish fingerlings stocking density (4940 ha^-1) of three species and management practices were similar in all plots. The water quality parameters, such as temperature, transparency, pH, dissolved oxygen, ammonia nitrogen and alkalinity were studied. Soil organic matter, available nitrogen and phosphorous were increased significantly (P < 0.05) in all plots after cultivating the fish. Specific growth rate, survival and fish production were significantly (P < 0.05) varied among the treatments. However, significantly (P < 0.05) higher net income and benefit–cost ratio were obtained in treatment T₁ with the values of 34296.24 Tk ha^-1 and 1.55 higher than the treatment T₂ and treatment T₃ respectively. Present findings indicate that the hardy fish like tilapia performed better in terms of production and economics than that of others fish species (Thai sarpunti and common carp) in rice-fish system in Barind area. So, it can be recommended that tilapia can be a good option while selecting aquaculture species for rice field in this red soil zone of Bangladesh.

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