Shapen, K., Gabbassov М., Rakhymova А. and Kasymkhanov , A. 2025. 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. 91, 3 (Sep. 2025), 79–90. DOI:https://doi.org/10.51889/2959-5894.2025.91.3.007.