ẢNH HƯỞNG CỦA MẬT ĐỘ TÔM CÀNG XANH (Macrobrachium resenbergii) NUÔI GHÉP VỚI ỐC BƯƠU ĐỒNG (Pila polita)

This study was conducted to determine the appropriate stocking density of giant freshwater prawns in the combined farming model with black apple snails. The experiment consisted of 4 treatments and each treatment had 3 replications with different prawn densities: no prawn and prawn densities of 3, 5 and 7 ind./m2. Snails were stocked at a density of 100 snails/m2. After 90 days of culture, the survival rate of prawns reached 100% and did not differ between treatments (P >0.05), However, the survival rate of snails decreased significantly when increasing the density of prawns in the system. If cultured alone, the snails obtained a higher weight (3.20 ± 0.16g) and shell height (24.76 ± 0.26mm) than the treatments of culture with prawns. The highest yield of snails was obtained when cultured without prawn, but there was no significant difference (P >0.05) when cultured with 3 prawns/m2. The research results showed that in the apple snail culture system (density of 100 snails/m2), co-culture with giant freshwater prawns is possible at a density of 3 prawns/m2.