Add to ORKGNot AvailableIn the recent past the invasion of two new sponge pests Cliona margaritifera Dendy and C. lobata Hancock on the molluscan beds of the southwest coast of India is reported. These two new pests made their first appearance on cultured pearl oysters on raft at Vizhinjam in 1980 and thence started spreading to the economically important molluscan beds in and around Vizhinjam. The spreading of these pests along the southwest coast of India was rather fast and from this coast C. margaritifera could migrate to the raft-cultured pear! oysters at Tuticorin and C. lobata to the chank beds off Tbiruchendur (southeast coast) within two years i.e. by 1982.Not Availabl