The problems of exploitation and ecological status of Omutninsk reservoir located in Kirov region

A comprehensive study of the Omutninsk reservoir located in Kirov region of the Russian Federation was carried out. The water basin in focus can be characterized as a typical small pond of the local flatland. The ecological condition of the pond is affected by the anthropogenic factors caused by the local iron works, the surrounding human settlement, and its recreational zones. It was revealed that the quality of local water meets the necessary standards in spite of the pressure coming from human activity. It is conditioned by the high level of water exchange with the rate of (4,4). The analysis of sediments revealed that a tendency to accumulate zinc, plumbum, and cadmium especially in the part located near the dam is rather strong. The phenomenon is associated with the high level of anthropogenic pressure. According to the study of macrozoobenthos and calculation of Shannon index the reservoir was classified as contaminated and dirty. The bioassay revealed no acute toxicity. A stimulation of bioluminescence of bacterial test system «Ecolum» was noted. This fact was estimated as a primary reaction to local water contamination. The process of regular algae blooming reduced the quality of local fishery. The evident degradation in fishery qualities is also caused by the reduction of oxygen in the content of pond’s water.