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Anthropogenic impacts of various types leading to eutrophication and pollution of the Black Sea are changing the main characteristics of all components of the aquatic ecosystem. Zooplankton plays a key role in the pelagic food web, since it binds primary producers of organic matter (phytoplankton), bacterioplankton and higher trophic levels (mainly fish). Organisms of zooplankton play also an important ecological role in processes of water self-clearing due to nutrition upon detritus, bacterioand phytoplankton, which are the main components of suspended organic matter. As a result, the water is cleared from organic and inorganic suspensions, the transparency of water increases, mineralized suspended organic matter are drawn into the cycle of substances, suspensions are deposited and accumulated on the bottom. Together with the others components of the marine ecosystem (phytoplankton, phytobenthos, zoobenthos, bacteria, fungi etc.) status of the zooplankton can be used to asses the ecological class of water quality. Unlike the physical and chemical indicators of the marine environment, biological indicators are far below the level of “information noise” associated with the dynamic properties of the ecosystem and are more closely related to the major stages of transformation of matter and energy. Traditionally, groups of both planktonic and benthic hydrobionts have been used to monitor the quality of the marine environment. Works carried out in accordance with the requirements of the EU Water Directive – WFD – (Directive 2000/60 / EC) and the Marine Strategy of the EU Water Directive – MSFD – (Directive 2008/56 / EC) for the classification and assessment of the reliability of various indicators – quality elements ) showed that there is a difference in the priority of indicators for open and coastal waters.

ZOOPLANKTON OF THE NORT-WESTER PART OF THE BLACK SEA IN 2016–2019 AND ASSESSMENT OF THE QUALITY OF THE ENVIROMENT BY ITS INDICATORS