We continued many-year studies of biotic and abiotic factors in marine environment of the Black sea coastal zone, as a constituent part of ecomonitoring and evaluation of natural processes of self-purification, with the purpose of working out and improvement of hydrobiological systems of the sea water purification and sanation of aquatoria, important recreatively and economically.

We used hydrobiological, microbiological, biochemical and geochemical methods of investigations, using such instruments as spectrophotometer IR-75, microscope MBI-3, Labsystems Bioscreen c, CHN-Analyzer, densitometer ERI-651, liquid chromatograph of high pressure "Millichrom", photocolorimeter CFC-2, ionometer I-102, analytic weighs.

We received new data on interaction of marine organisms and their communities with pollution, which proved a possibility of purposeful use of marine biodata for indication of pollutions, purification of sea water and recreation of the coastal aquatoria. The results of 25-years monitoring investigations in the Sevastopol bays, testifying to some stabilization of ecological situation have been summarized. An effectiveness of use of different variants of hydrobiological systems for melioration of ecological parameters of marine environment has been shown.

Participation in analoguous studies in the northern seas (Barents, Carsk) has shown, that the results of the works could be used for the other seas.

The materials obtained open a possibility of effective use of scientific workings out for forecasting and decrease of ecological sequences, as a result of nearing the ways of transportation of hydrocarbon energy carriers to the shores of Crimea and Ukraine, as a whole.

Key Words: Sea water, bottom sediment, microbenthos, meiobenthos, macrozoobenthos, hydrobiological system, hydrocarbon pollution, self-purification, sanation.