Ecological and toxicological state of the volkhov bay of ladoga lake

Abstract

The article deals with the issue of the ecological and toxicological state of the Volkhov Bay of Ladoga Lake — one of the most polluted water areas of the reservoir, which is of important fisheries importance and has a significant impact on the water quality of the Neva River in winter. Biological and chemical-analytical studies conducted in the summer of this year showed mass lesions of fish with chronic toxicosis. The study of water and bottom sediments did not reveal pronounced deposits from the norm, which is associated with the hydrological features of this water area — the nature of bottom sediments and the presence of currents, which contributes to the removal of pollutants outside the lip into the lake. Fish turned out to be the most informative indicators of the quality of their habitat. The study of various fish species caught in these waters showed that their toxicosis, regardless of the type, is of a massive nature, proceeds chronically, mainly with mild and moderate injuries in the gill tissue and parenchymal organs. It is shown that the lesion of fish is associated with and more pronounced in the water areas gravitating to the sources of pollution — the mouth of the river Volkhov and the stock of the Syasky Central Bank. Assessing the ecological and toxicological state of the Volkhov Bay at the present time in comparison with the results of past studies, some improvement should be noted.