Abstract
The features of the long-term dynamics of various indicators of a hydrochemical mode in deep-water areas of the Baltic sea were considered. Influence of the content of the dissolved oxygen and salinity of water as major ecological factors for the efficiency fishery productivity was characterized. The comparative analysis of long-term dynamics sea levels surfaces in a southwest part of the Baltic sea and in strait Kattegat was made. It was shown that inflow of water mases in many respects depended on the sea level difference between these areas from the North Sea possessing the raised salinity and the higher content of the dissolved oxygen. The principal reasons capable to lead to occurrence of the most intensive intrusion of the North Sea waters were analysed.
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