Monitoring of fish lesions by metacercariae in the reservoirs of the Republic of Chuvashia and Mari El

The research work was carried out in the period from May 2020 to September 2021. The objects of the study were the reservoirs of the republics of Chuvashia and Mari El and the fish caught on them. Among the caught fish, the analysis of the species composition and the percentage of postdiplostomiasis was carried out. Subsequently, a veterinary and sanitary examination of all the fish caught was carried out. According to paragraph 3.9 of the Rules of veterinary and sanitary examination of freshwater fish and crayfish (approved by the Main Veterinary Department of the USSR State Agrarian Industry on June 16, 1988), all fish caught after stripping the affected areas were allowed to be processed into culinary products with heat treatment, fish affected by postdiplostomosis was not recommended for salting, smoking, pickling and drying. Good-quality fish were allowed to be used without restrictions. The conducted research has established that among the considered reservoirs, almost all are unfavorable for postdiplostomosis. They are home to a large number of affected fish. If you eat such a fish, you can get infected with a worm infestation.