Date Received: 23-06-2025 / Date Accepted: 30-10-2025 / Date Published: 24-11-2025
This study was conducted to determine the effects of stocking densities on growth, survival rate and productivity of mangrove clam (Geloina coaxans) in different pond models. Clams were stocked at two locations in earthen shrimp pond and earthen pond in U Minh Thuong district, Kien Giang province (now An Giang province), with three densities of 20, 40 and 60 individuals/m2, with three replicates during a culture period of 120 days. The results of clam survival rate varied from 90.0 to 91.7% in earthen shrimp ponds and 87.5 to 88.3% in earthen ponds, with no significant difference (P >0.05) between stocking densities in the same model. The growth rate of length and weight of clams at a density of 20 individuals/m2 was equivalent to 40 individuals/m2 (P >0.05) but was significantly higher (P <0.05) than at a density of 60 individuals/m2 in both pond models. After 120 days of farming, the stocking density of clams at 40-60 individuals/m2 in earthen ponds combined with white-leg shrimp achieved a yield of 0.91-1.22 kg/m2, higher than the yield at the same density of clams raised in earthen ponds (0.64-0.91 kg/m2). Clam farming in earthen pond combined with white-leg shrimp achieved higher results in terms of harvest size, survival rate and yield compared to the model of raising clam alone.
