STATE OF WATER BIOLOGICAL STOCK RESOURCES IN THE IVANKOVSKOE AND UGLICHCHSKOE RESERVOIRS
D. V. Goryachev, А. И. Никитенко, N. N. Klets, D. A. Gvozdarev, M.Iu. Kudinov, Iu.I. Solomatin, A. P. Butorina
Abstract
Based on the results of trawl-acoustic and net surveys, a comparative analysis of commercial and biological indicators (size, weight, and sex composition) of water biological resources of the Ivankovsky and Uglich reservoirs of the Volga-Caspian fisheries basin was performed. Commercial stocks for the main fish species are also calculated. The materials were the results of trawl-acoustic surveys obtained during joint expedition research by specialistsf the branch for freshwater fisheries of the VNIRO Federal state budgetary institution (VNIIPRH) and the I. D. Institute of biology of inland waters. Papanina of the Russian Academy of Sciences at the Academic Topchiev research center in 2018-2019. On the example of bream, the sizeweight dependence (LWR) is calculated using the equation W = axTLb. A total of 917 copies were analyzed. Bream in the Ivankovsky and Uglich reservoirs showed negative allometric growth. In the Ivankovsky reservoir, there is an increase in the reserves of Guster and roach, in the Uglich reservoir-bream. This may be due to the entry of productive generations into the fishery, a decrease in the load in the trophic chain (a decrease in river perch stocks), and a small impact of Amateur fishing and poaching from 2014 to 2019 they account for only 1 % of commercial stocks.