STUDY ON PRE-OPERATION CONDITION AND PEARL PRODUCTION OF PINCTADA MARTENSII
In order to standardize farming operations,increase pearl quality and percentage of high-quality pearls from Pinctada martensii.From August 2008 to November 2009,the pre-operation condition of Pinctada martensii,with weakening process in wicker basket and plastic bucket,culture water depth adjusting and freshwater immersion was carried out at Xuwen Longzhi pearl farm,Zhanjiang,Guangdong.It was found that there existed significant difference in survival rate among the groups after pre-operation condition,with survival rate varying from 80.0% to 95.2%.After 30-day rehabilitation,there were significant differences in survival and retention rates among the groups,with survival and retention rates ranging from 57.1%~84.0% and 54.9%~79.1%,respectively.During the pearl culture,there were significant differences in survival and pearl rates among the groups,with survival and pearl rates being from 63.1%~75.1% and 51.1%~70.1%,respectively.The present results indicate that freshwater immersion for 1 hour is effective to increase the survival,retention and pearl rates of pearl oyster P.martensii,and the method and be used in the commercial culture of the species.