Author(s): Mohammad Ashaf-Ud-Doulah, Md. Shariful Islam, Nafia Binte Ryhan, Shaheed Nasrullah Al Mamun, Md Salmon Hasan Biplob, Sunny Khan Majlish and Kazi Atiah Taiyebi

Abstract: Field experiments demonstrated that rice-fish farming indeed increased the productivity of rice field and help to achieve ecological, economical, and social benefits. An experiment was accompanied in the rice field plots to ascertain the felicitous fertilization effects on the growth performance of Nile Tilapia (Oreochromis niloticus) and Shing (Heteropneustes fossilis) cultured in the rice fish farming system. Each treatment of fish species cultured with different doses of fertilizer such as T₁ control: without any fertilization; T₂ with 10 kg/decimal compost and T₃ with 100% recommended fertilizer: Urea 100g, TSP 100g, MOP 50g, MOK100g/decimal respectively for fish culture. Current study showed a direct relationship between nutrient supplies and yielding of rice; increasing nutrient supply highlighting an increase of yielding fish. These indicated significantly greater fish yield at treatment T₃ followed by treatment T₂ and T₁ in Shing with rice culture. Concerning Tilapia with rice culture, the same occurrence was observed. The gross production of Tilapia were found 5.04 ± 2.66, 8.65 ± 2.42 and 12.02 ± 1.45 kg/decimal in T₁, T₂ and T₃, respectively and gross production of Shing were found 3.06± 1.76, 6.17 ± 1.84 and 8.83 ± 2.88 kg/decimal in T₁, T₂ and T₃, respectively. During the experimental period the ranges of water temperature were (27.26 to 31.22 °C), dissolved oxygen (5.66 to 7.20 mg/L), pH (7.25 to 7.65 mg/L), total alkalinity (148.00 to 176.00 mg/L), free CO₂ were (1.40 to 3.00) mg/L and found within the productive limit and more or less similar in all the plots under the T₁, T₂ and T₃. The outcome in T₃ provided the maximum yields amongst all treatments, followed by treatments T₂ and T₁ representing that the fertilizer is the furthermost suitable nutrient input regime aimed at the rice- fish integrated culture scheme. The results of the study revealed that polyculture of tilapia and Shing could be practiced in rice field.

DOI: 10.22271/fish.2021.v9.i6b.2589

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