Shapen, K., Gabbassov М., Rakhymova А., and A. Kasymkhanov. “ASSESSMENT OF FISH POPULATION DYNAMICS IN LAKE ZAISAN USING A COHORT APPROACH BASED ON RESEARCH AND COMMERCIAL CATCH DATA”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences, vol. 91, no. 3, Sept. 2025, pp. 79-90, doi:10.51889/2959-5894.2025.91.3.007.