ẢNH HƯỞNG CỦA ĐỘ MẶN LÊN SINH TRƯỞNG VÀ TỶ LỆ SỐNG CỦA HÀU RỪNG ĐƯỚC (CRASSOSTREA SP.)
Abstract
Effects of different salinities from 5-30? on the growth and survival rate of oyster Crassostrea sp were investigated. Oysters were collected from mangrove forest, Ngoc Hien district, Ca Mau province with shell length varied from 55 to 60mm and shell weight from18 to 20g. Oysters were fed with diet consisting of Chaetoceros algae, dried algae and yeast. After 120 days of cultured period, shell length growth rate of oysters were not significantly different among treatments (p>0.05). However, weight gain of oyster in 5? treatment were lower than other treatments (p<0.05). Observation of Digestive Gland Index illustrated that oysters could ingest feed at salinities varied from 10 to 25? as well, out of this range the effective ingestion was low. Survival rate of oysters at salinity of 10? (87,8%) and 15? (76,7%) were higher than others (p<0.05). Results showed that oyster Crassostrea sp. in mangrove forest from Camau province could grow and survive in salinities from 5 to 30?, however they performed the best at salinity from 10 to 15?.
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