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The White Sea is one of the most explored water areas in Russia. However, the number of works, devoted to the planktonic fauna distribution of the tidal water areas, is limited, which is explained by the lack of hydrodynamical regime researches of these areas. In the article, the results of the computer simulation of hydrodynamical processes in the Chupa, Keret and Nikolskaya inlets of the White Sea are presented. The simulations were performed with the computer program “CARDINAL” (Coastal Area Dynamics Investigation Algorithm). It is shown that planktonic organisms living in the same water areas under the identical hydrodynamical conditions have various strategies directed either to removal to the open areas of the sea, or to the natural habitat preservation.