Abstract
Annotation.The article provides the weight ratio of fish caught in various fishing gear, the reservoir on the Solyanka River of the West Kazakhstan region for 2020, in order to determine the maximum allowable catch for 2021-22 in the future.The following main fish species are represented in the Solyanka River in percentage terms: bream -7.7%, crucian carp -23.1% each, roach -38.4%, rudd and perch -15.4%.When calculating the total allowable catches of the reservoir on the river.Solyanka, the following circumstances were taken into account in the study of biological indicators of fish: the presence of sexually mature individuals that have reached the commercial level, the mandatory presence of females in the population, as the main evidence of the presence of population reproduction.In general, the state of populations of species living in the reservoir can be assessed as satisfactory..Keywords: reservoir on the Solyanka River; West Kazakhstan region (WKR); quantitative and weight ratio of fish; fatness of fish according to Fulton; total allowable catch.