In the upper part of the Kapshagai reservoir, on February 26, 2023, an expedition team of ichthyologists of the “NPC RH” discovered an alien hairy-armed Chinese crab Eriocheir sinensis (H. Milne Edwards), which weighed 261 g, body length 6.8 cm and width 7.2 cm. A large male specimen in size exceeds the weight of all crabs previously noted in the reservoir (150-152 g). It has been found in catches only once since 2006, in winter it was recorded for the first time. 

Research on the influence of alien hydrobionts on the ecosystems of transboundary watercourses is carried out under the PCF program for 2021-2023.