Estimation of Infection with Metacercariae of Opisthorchid Fishes of the Cyprinidae Family in the Khanty-Mansi Autonomous Okrug – Yugra

The purpose of the research is to determine quantitative indicators of infection of fish of the cyprinid family with opisthorchid metacercariae in the rivers of Khanty-Mansi Autonomous Okrug – Yugra. Materials and methods. The researches were done for the Bolshoy Yugan, Vynga, Tromyogan, Pim, Ob, Irtysh rivers in 2012–2018. Fish species was identified under the identification guide, and their age was determined by their scales. The fish were examined for the presence of metacercariae of opisthorchids by compression of the spinal muscles followed by microscopy according to the generally accepted technique. Results and discussion. The extent of infection of ide by opisthorchid metacercariae ranged from 11.2–87.4% in different rivers, spruce – 35.6–94.1%. With the age of fish, the extent of infection and the abundance index increase due to the accumulation of infection. There are species of fish identified that are less vulnerable to the infection. The highest rate of fish infection was observed in the Irtysh River.