Vol. 9, Issue 1, Part C (2025)

The study was conducted to evaluate the growth performance of Amur common carp and Jayanti rohu under extensive poly-culture system in low-input aquaculture systems like pond and water storage tanks of Shivamogga district. In the present study, locally cultured Common Carp (Cyprinus carpio) and Rohu (Labeo rohita) was replaced with improved variety of Amur Common Carp and Jayanti Rohu in order to assess the growth performance. A total of 12 number of culture pond and water storage tanks which retain water for more than 6 months were selected and suitability of these water bodies were assessed. Amur common carp and Jayanti rohu fingerlings were stocked at the rate of 8000/ha with three different species ratio with four replications. Amur common carp and Jayanti rohu stocked at different ratio viz., 5:5, 6:4 and 7:3 is treated as Treatment T_1, T₂ and T₃ respectively. During the experiment duration fishes were fed with rice bran and ground nut oil cake @ 5 to 10% of fish body weight. Water quality parameters and growth performance of fishes were recorded in every fortnight. The highest growth of Amur common carp (422.78 gm) and Jayanthi rohu (256.13gm) recorded in Treatment T₁. Treatment T₁ showed better growth of fishes compare to T₂ and T₃. Amur common carp exhibited a better growth compared to Jayanti rohu in all among the treatment and it could be inferred that Amur common carp is most suitable species for poly-culture with Jayanti rohu in low-input aquaculture systems like culture pond and water storage tanks.