Abstract
Restructures in the communities of hydrobionts take place for the rivers with abrupt changes in hydrography and hydrological regime, as a result of flow regulation. They require long-term monitoring to develop preventive measures to avoid negative consequences and to restore the river ecosystem. Some biological characteristics of the broad whitefish (Coregonus nasus) have been studied during spawning migration in the upper reaches of the Yenisei River. The limiting values of the fish length were higher in 2016, and the average - in 2013. In 2013, the sampling frame consisted of fish of 51-55 cm in size, in 2014 and 2016. - 41-45 cm. In 2013, most of the fish in the catches were aged from 6+ to 11+ years, in 2014 - from 8+ to 10+ years, in 2016 from 8+ to 11+ years. The gender ratio was close to 1:1; most of the individuals had gonads at maturity stage III.
Highlights
As a result of hydroelectric construction, a number of water reservoirs have been appeared in the Yenisei River basin
Whitefish are valuable commercial fish that provide a significant share of fish products in freshwater reservoirs of Siberia
The study of the biological features of whitefish in the large spawning rivers of Siberia - the Ob, Yenisei, Lena, and Kolyma - is used to calculate the damage to fisheries, to develop the measures for the protection of fish resources, and to plan fishing
Summary
As a result of hydroelectric construction, a number of water reservoirs have been appeared in the Yenisei River basin. The study of the biological features of whitefish in the large spawning rivers of Siberia - the Ob, Yenisei, Lena, and Kolyma - is used to calculate the damage to fisheries, to develop the measures for the protection of fish resources, and to plan fishing. A goal of research was to study and to supplement some biological characteristics of the broad whitefish of the Yenisei River. To achieve this goal, it was necessary to study the size, weight, and age composition; to characterize the gender ratio and the degree of maturity of the gonads. Within the framework of monitoring the state of the broad whitefish, its main biological characteristics were studied
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