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The aim of the study is to determine the distribution of three species of fish trematodes in the Pavlodar region, as well as features of infection of definitive hosts and their parasitological analysis. The prospect of studying the fish trematode fauna of the North-East Kazakhstan is relevant because the life cycle of this group of parasitic worms depends on several groups of organisms that are intermediate, accessory and final hosts. 3 species of trematodes were identified: Azygia lucii, Bunodera luciopercae, Sphaerostomum bramae. The indicators of the invasion, prevalence and abundance index of parasites within the examined fish species were determined. The results demonstrated a good state of the intermediate hosts living in the Irtysh River and its reservoirs, infected by the three species of trematodes.