Harmful effects of the two pilate molluscan species Cymatium pileare and Linatella caudata on the culture of pearl oysters in Vung Ro Sea Water, Phu Yen, Viet Nam

摘要

Cymatium pileare and Linatella caudata are two injurious predators to the pearl oyster Pinctada martensii cultured in Vung Ro cove, Phu Yen Province, Viet Nam. Ten culture cages of P. martensii containing 150 individuals each were kept under observation. After nearly a year of observation, the initial number of oysters, 1,500, was decimated by the two predators and reduced to only 67. Today, there are no better methods of destroying C. pileare and L. caudata than pulling the cages to the surface once every ten days to get rid of the predatory shells.