ヤマトシジミの浄化能力が小川原湖に与える影響について

摘要

The Corbicula japonica fishery in Aomori Prefecture has been performed in Lake Ogawara and Lake Jyusan. Recently Corbicula japonica has been decreasing in Lake Ogawara, which is brackish lake located in the southeast of Aomori and is well-known as its major source. In order to investigate the cause of the decrease and to control its proliferation, it is necessary to research the relationship between Corbicula japonica and its environment.In this research, we have examined the water quality of the lake, and its relation with the purification ability of Corbicula japonica. The results of the examination show that Corbicula japonica has the purification ability of chlorophyll-a and chemical oxygen demand. The ability depends on its connection with the number of monads, water temperature and the rudiment of the concentration of chlorophyll-a and chemical oxygen demand. This ability evidently affects the environment of the lake.