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Natural waters are polluted by sewage, industrial and transport waste leads to a decrease the oxygen content in the water and the disappearance of valuable fish species. As a result, the eutrophy of the reservoir develops - the saturation of reservoirs with biogenic elements, accompanied by an increase in the biological productivity of water basins. The purpose of the work was to study the bioecological state of water basins in the Luga district of the Leningrad region, the prospects for de-eutrophication. The monitoring data of water bodies were studied and factors influencing the bioecological state of water bodies were considered. Physicochemical, sanitary and microbiological, parasitological and toxicological research methods were used in the work. Objects of research: the rivers Obla and Svinechnaya; lakes Toloni and Omchino. All this is a very unfavorable factor and indicates strong water pollution. To combat the eutrophication of water bodies, preventive and regulatory measures are used. A promising prevention of eutrophication is a biotechnological method, including the cultivation of plants in the coastal zone, breeding of herbivorous fish, the use of the method of algolization (introduction of a chlorella suspension).

Features of the bioecological state of water bodies in the Leningrad region and de-eutrophication measures