Abstract: Genetic diversity of several wild and hatchery populations of Crassostrea angulata from Fujian and south Guangdong coast was analyzed by 10 microsatellite markers with high polymorphism and non-genetic-linkage among them. Three hatchery populations were sampled from Zhangpu of Fujian Province (zp1), Raoping (zp2) and Daya Bay (zp4) of Guangdong Province, and the wild population (zp3) was collected from Zhangpu of Fujian Province. The results revealed that high level of genetic diversity existed not only in wild population but also in the three hatchery populations with the expected heterozygosity ranged from 0.769 to 0.857 in the hatchery populations and 0.878 in the wild population. The observed heterozygosity ranged from 0.410 to 0.518 in the hatchery populations and 0.529 in the wild population. The gene diversity was also high in the hatchery populations (ranged from 0.769 to 0.857) and wild population (0.878). The results showed that the germplasm recession problems did not exist in both wild and hatchery populations. Significant genetic differentiation existed among these four populations, suggesting that genetic exchanges were limited among them. Since the genetic diversity of the hatchery populations was lower than that of the wild population, germplasm recession of C. angulata should be concerned and prevented.

Key words: Crassostrea angulata, breeding population, wild population, genetic diversity