Due to mass emission of high density of carbon dioxide of modern industry, human meet the earth warming. Due to the climate change of the earth, it is necessary to study early the adaptation of organism and the selective breeding for high temperature environment. This study is conducted to select the high temporal tolerable strain of oyster. The study of temporal tolerance of oyster was conducted when they were treated in four temperature level (35,36,37,38℃). In this study the survival rate of third generation of high temperature tolerance of oyster strain was decreased to 0% and was worse than the first and second generation when reared in an 38℃ water temperature environment. It is possible that these third generation oysters were reared in an higher salinity water resulted in higher stress than the first and second generation oysters.
Therefore, it is necessary to decrease water temperature and salinity to reduce the mortality during summer.