Current status of the Colletopterum bactrianum Rolle 1897 population in the Uzbekistan reservoirs

The study assessed the current state of the population of Colletopterum bactrianum in Uzbekistan reservoirs from the rivers Syr-Darya, Syr-Darya region, middle Zarafshan and Amu-Darya. At the same time, individual and organismic indicators in the population were compared. Differentiation of the C. bactrianum population in water bodies is determined by their age. The ratios between the four age groups in the areas of Central Zarafshan and Central Amu-Darya are 1.0 : 0.8 : 0.5 : 0.3 and 1.0 : 0.8 : 0.7 : 0.3, while such ratios are the norm for the population of this bivalve mollusk.