Abstract
The paper presents for the first time the results of long-term observations of the conditions and efficiency of the natural reproduction of aquatic biological resources in Lake Tsatsa in-cluded in the Sarpinsky lakes system. In a comparative aspect, the data from studying the commercial fish natural reproduction during 2016-2019 are presented (according to the juvenile fish yield). There has been considered the species composition, as well as the changes of juvenile abundance on the spawning grounds of Lake Tsatsa under different hydraulicity of spring floods during the observed period. The species composition of the main commercial fish juveniles is represented by 10 species. The most stable natural reproduction (high productivity of juveniles) was observed in roach, rudd and perch. Over the entire observation period, the number of roach juveniles dominated by 1.23-3.87 thousand sp./ha. The abundance of pike perch, pike, silver bream and tench has also remained stable for four years, but with the lower quantitative characteristics. The analysis of data on the productivity of juveniles showed that the water regime had the most significant effect on the natural reproduction of carp in Lake Tsatsa. The efficiency of its natural reproduction increases significantly in a high-water year (by 6-32 times) compared with dry years. The influence of hydrological and temperature regimes on the efficiency of natural reproduction of commercial fish has been shown. The terms of spawning of the most abundant commercial fish species are given. The main factors of the anthropogenic impact affecting the ecosystem of Lake Tsatsa and reducing the abundance of the aquatic biological resources reserves due to their natural reproduction have been determined. The data obtained in the course of the research will help solving the problem of amending and supplementing the fishing rules, since there were no terms (periods) in the rules for placing a ban on catching aquatic biological resources for this reservoir
Highlights
The paper presents for the first time the results of long-term observations of the conditions and efficiency of the natural reproduction of aquatic biological resources in Lake Tsatsa included in the Sarpinsky lakes system
The species composition of the main commercial fish juveniles is represented by 10 species
The analysis of data on the productivity of juveniles showed that the water regime had the most significant effect on the natural reproduction of carp in Lake Tsatsa
Summary
1 All-Russian Research Institute of Fisheries and Oceanography, Volgograd Branch, Volgograd, Russian Federation The paper presents for the first time the results of long-term observations of the conditions and efficiency of the natural reproduction of aquatic biological resources in Lake Tsatsa included in the Sarpinsky lakes system. The data from studying the commercial fish natural reproduction during 2016-2019 are presented (according to the juvenile fish yield).
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