COMPREHENSIVE ECOLOGICAL ASSESSMENT OF ENVIRONMENTAL FACTORS AND THEIR INFLUENCE ON REPRODUCTIVE INDICATORS IN THE FORMATION OF THE PREPARATORY PARENT COLLEGE OF GRASS CARP (CTENOPHARYNGODON IDELLA VALENCIENNES, 1844) FISHES UNDER POOL FISHERY CONDITIONS

This article presents a comprehensive ecological assessment of the influence of environmental factors on broodstock formation of grass carp (Ctenopharyngodon idella Valenciennes, 1844) under pond aquaculture conditions in the Tashkent region. Water quality parameters, including temperature, pH, dissolved oxygen, mineralization, ammonia, nitrite, nitrate, and phosphate, together with hydrobiological characteristics, natural food resources, and reproductive performance of brood fish were evaluated. The obtained results were compared with recent studies conducted in China, Vietnam, Europe, and FAO recommendations. The findings demonstrate that a stable aquatic environment significantly improves the physiological condition, gonadal development, and reproductive efficiency of broodstock. The study provides a scientific basis for ecological monitoring and sustainable broodstock management in freshwater aquaculture.