Influence of salinity on survival and growth of Crassostrea gasar
Keywords:
maricultura, mangrove oyster, estuary, abiotic factorAbstract
The purpose of this study was to evaluate the effect of salinity on the growth and survival of the mangrove oyster Crassostrea gasar. A laboratory trial was conducted in 10 treatments, each in triplicate, corresponding to rising values of salinity at intervals of 5 in the range of 5-50, totaling 30 experimental units. The survival and growth of the oysters were significantly influenced by salinity. A high survival of oysters in the salinity range between 10 and 45 was found. Significantly higher survival rates were obtained at salinities of 20 and 25, while at 5 there were lower survival rates. The final mean shell size and live weight of the oysters were significantly higher at a salinity of 25, while the lowest growth was registered at 5 and 50. The results suggest that the C. gasar oyster is resistant to a broad salinity range, and can be cultivated in marine regions or estuary environments that do not have salinities equal or lower than 5.
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