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The natural environment in a brackish lake largely depends on the balance between the seawater intrusion and the salinity circulation. The latter has a great influence on the ecosystem there. Recently, Corbicula japonica has been decreasing in Lake Ogawara, which is, having been one of the most abundant lakes in Corbicula japonica in Japan, a brackish lake located in the southeast of Aomori Prefecture. So it is necessary to clarify the causes and to proliferate the ways for solution. In this research, our aim is to examine the water quality in Lake Ogawara for explicating the reasons for the decrease. The data of the field works are used to consider the relationship between the water quality and the egg-laying and hatching of the Corbicula japonica. The results of the examination show that the egg-laying took place only in the north area of the lake, where the salinity flux is comparative more frequent than other areas. The larvae were diffused over the whole area through waves caused by winds in various conditions.

CORRELATION BETWEEN WATER QUALITY IN THE LAKE OGAWARA AND HATCHING OF CORBICULA JAPONICA