Identification The Species Of Crassotrea Cultured In Lap An Lagoon, Phu Loc District, Thua Thien Hue Province, Vietnam

Oyster farming is the main livelihood of many households in Lap An lagoon, Lang Co town, Thua Thien Hue province, Vietnam. Fingerlings were mainly collected from the wild. From March to April each year, farmers put substrates into the lagoon, then many oyster fingerlings clung on there and grew up. Oysters were harvested after 10 to 12 months of culture. At the harvest time, many oyster species were found on the same substrates. In this study, five species were identified: Jinjiang oyster (Crassostrea rivularis), Pacific Oyster (Crassotrea gigas), American cupped oyster (Crassostrea. sp(1)), Crassotrea sp(2), and Hooded oyster (Saccostrea cucullata). Among five species, three were dominant (100%), available at all research areas, including Crassostrea rivularis, Crassotrea sp(2) and Saccostrea cucullata. The other two species only accounted for 50 - 60%.