REPRODUCTION OF FISH AND IN-VERTEBRATES UNDER THE INFLU-ENCE OF POLLUTANTS

The pollution of surface waters has become rampant, which has led to the degradation of many fishery reservoirs. The variety of toxicants entering water bodies in various ways is extremely large and is constantly being replenished with new substances. Their impact on aquatic organisms is associated with the development of pathological processes, degradation of populations up to their death. This is especially evident in the main object of the use and protection of fishery reservoirs - fish. First of all, the most valuable species of whitefishes and salmon-ids suffered in the North-West region. The paper considers one of the main problems of fisheries in the North-Western region of Russia - the decrease in fish stocks and catches in natural reservoirs, and reveals the main reason for this ongoing process - the violation of natural and factory reproduction of fish and invertebrates due to the influence of a toxicological factor. This primarily affected the most valuable fish species - salmonids, white-fishes, pike perch. It has been shown that in recent years in Lake Ladoga (especially in its southern shallow zone, the main breeding and feeding zone of many fish species) and other reservoirs of the region, the negative situation of violation of reproduction of fish and invertebrates (fish food supply) has significantly worsened, which has had a very negative impact, including the decline in the catch of especially valuable fish resources. Measures to prevent negative events are indicated. The need to take urgent measures to reduce the flow of pollutants into Europe's largest Lake Ladoga and other important fisheries reservoirs in the North-West region is emphasized.