Hatchery seed production of the scallop Chlamys nobilis (Reeve, 1852)
1997
Thu, Nguyen Thi Xuan (Research Institute for Aquaculture, Nha Trang (Vietnam))
Spawning of C. nobilis was induced by air exposure, or thermal stimulation. Fertilized eggs developed into the D-shaped larval stage within 20 hours. After 8-9 days pediveligers measured 0.165-0.180 mm. Survival from fertilized egg to the settlement of the larvae was 0.5-7.1 percent. One month after settlement the spat measured 1-2 mm in shell length, and 4-7.8 mm after 2 months. Survival of the spat the first 2 months after settlement was 80-85 percent. After 11 months the juveniles had reached a shell lenght of 48-60 mm with survival of 40-50 percent. The mean growth rates were 4.52 mm per month. Heavy fouling and dissatisfactory environmental conditions were the main problems encountered in Vietnam.
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