The interimediate breeding of wild spats for Japanese scallop Patinopecten yessoensis.

The intermediate culture of wild Japanese scallop Patinopecten yessoensis spats collected two months later than the artificial spat was conducted to produce over 3 cm shell length juveniles for aquaculture from 2006 to 2008.It was found that there was no significant difference in survival at stocking density from 90 to 110 individuals/layer in a net cage.The scallop was 3.28 cm in average shell height at the stocking density of 70～90 ind/layer,in which the individuals with shell height of over 3 cm accounting for 83.33%.When the densities were 120～130 ind/layer,the scallop was 3.08 cm in average shell height,the individuals with shell height of over 3 cm accounting for 61%.The scallop was 2.77 cm in average shell height at stocking density of 160～170 ind/layer,the individuals with shell height of over 3 cm accounting for only 22%.Restocking time affected significantly the growth of the scallop.The wild spat growth was improved in July and August by early restocking and thus large size scallop was obtained.The survival of the wild spats was reduced at water temperature of over 23 ℃ during the intermediate breeding.