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Quantitative indices of herring infestation in Sakhalin waters reveal a high infection rate of fish in the basin of the Sea of Okhotsk, off the east coast of the island. Moreover, in certain years almost 100% of herring were infested. The so-called local populations as well as widely migrating Sakhalin Hokkaido herring are confined to the area of this waterbody. In the basin of the Sea of Japan, off the west coast of Sakhalin, the indicator values of herring infestation are much lower. The local population as well as widely migrating herring of Sakhalin Hokkaido population are confined to this marine area. The causality analysis of herring infestation in these areas allows to confirm our earlier conclusions about population structure of herring inhabiting the waters around Sakhalin Island.