CHARACTERISTIC OF THE SEXUAL-AGE STRUCTURE OF THE RATTANHEAD IN LAKE RASPLATNOE OF THE ZHAMBYL DISTRICT AND LAKE POLOVINNOE OF THE DISTRICT M. ZHUMABAYEV

The paper presents the results of a study of the sex-age structure of invasive populations of Amur sleeper in Lake Rasplatnoe, Zhambyl region and Lake Polovinnoye of M. Zhumabaev's area in 2020. The goal is to study the sex-age structure of the Amur sleeper (P. glenii) populations within a part of the invasive range.
The material for this work was a sample of P. glenii of different ages from the population of Lake Rasplatnoe, 85 individuals and Lake Polovinnoe, 78 individuals. Fish were caught on a fishing rod on the lake of the population of Polovinnoye in July 2020 and on the lake of Rasplatnoye in August 2020. The relative age of the fish was determined by the growth rings on the scales under a binocular microscope, the sex was determined by the gonads at dissection.
In the studied sample, nine age groups were identified. Reliably the most numerous age groups are yearlings and biennials; the smallest are four-year-olds and five-year-olds. Both populations are characterized by a normal distribution of sex groups, with a small numerical dominance of males.

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