野生和养殖牡蛎种群的比较摄食生理研究

１９９５年４～５月在山东省荣成市桑沟湾用模拟现场流水法对该湾野生和养殖太平洋牡垢种群不同大小个体的摄食生理进行了比较研究。实验结果表明，野生和养殖太平洋牡蛎种群在滤水率、选择率和吸收率等方面无明显的差异，但在保留率和摄食率等方面有明显的差异。这说明野生种群能比养殖种群更好地过滤下并摄入海水中的颗粒物。根据实验数据，用计算机模拟得出了野生和养殖牡蛎种群的滤水率与个体体重的关系为：ＦＲω＝２．８８２３Ｗ０．３６４７，Ｒ２＝０．９４２２和ＦＲｃ＝４．０１４４Ｗ０．２６９１，Ｒ２＝０．９０２９。

COMPARATIVE FEEDING PHYSIOLOGY OF WILD AND CULTURED POPULATIONS OF PACIFIC OYSTER CRASSOSTREA GIGAS

The production of Pacific oyster Crassostrea gigas. a worldwide aquaculture species, is among the highest of shellfishes, but the individual size and mean meat index of the cultured POpulation are usually smaller/lower than that of the wild population. In order to understand if these differences are related to the feeding regimes of the wild and cultured oyster populations,the authors studied the comparative feeding physiology of these two populations in singgou Bay during April and May, 1995. The experiments were carried out semi-in situ using a running seawater system. Results showed that there were no significant differenes in filtration rate,sorting efficiency and absorption efficiency between the wild and cultured POpulations, but that there were significant differences in retention efficiency and ingestion rate. These indicated that comPared to the cultured ones the wild oysters could ingest more fed from seawater. Based on the filtration rate of oyster with different they sizes (7 size classes were tested),the simulated relationship between filtration rate and dry tissue weight were as follows: for the wild Population,FRw=2. 8823W0. 3547, R2= 0. 9422, and for the cultured population, FRc= 4. 014 4W0. 2691, R2= 0. 9029