Abstract
This article presents the results of a study of the content of the main chemical components of the surface waters of the Bagyrlay, Sholak-Ankaty, Esen-Ankaty reservoirs of the Akzhaiksky district of the West Kazakhstan region and determined the infection of fish with Opisthorchis felineus metacercariae. Hydrochemical parameters of surface waters of reservoirs were determined by chemical and physico-chemical methods of analysis. The infection of fish with Opisthorchis felineus metacercariae was determined by the compressor method. As a result of the conducted research, it was found that, according to the level of halobicity, reservoirs belong to the oligohalobic, alphamezohalobic and betamezohalobic zones, i.e. related to brackish waters; according to the saprobity class, reservoirs belong to oligoprobic, i.e. to clean waters, which is favorable for the development and reproduction of fish; the content of the above-mentioned hydrochemical indicators in the studied reservoirs does not exceed acceptable standards for fishery reservoirs; in the reservoirs of the Ural-Kushum irrigation and irrigation system and the middle floodplain of the Ural River, the conditions necessary for the circulation of the pathogen opisthorchiasis in their biocenoses have been formed.