THE CURRENT STATE OF PRODUCTIVITY OF PERCH AND ROACH IN THE UPPER ERTIS CASCADE OF RESERVOIRS

Abstract

Resume . The materials collected as a result of expedition trips conducted in 2021 at the Shulbinsky, Ust- Kamenogorsk reservoirs and the Buktyrma reservoir were used in the work. The article provides brief physical and geographical characteristics of the reservoirs of Buktyrma, Ust-Kamenogorsk and Shulbinsky. In the Upper Irtysh cascade of reservoirs, roach and perch are the leaders in fish yield. Natural reproduction is important for improving the qualitative composition of populations due to its replenishment with young from the most resilient individuals. The characteristic of the size and weight indicators of juveniles and the yield of roach and perch of the Upper Irtysh cascade of reservoirs is given. The research is funded by the Ministry of Ecology, Geology and Natural Resources of the Republic of Kazakhstan (Grant BR10264205).