Monitoring sanitary state of perch (Perca fluviatilis L.) in open and closed water bodies of Volga basin

The article describes the main task of the sanitary-parasitological inspection as a timely detection of parasites and the degree of infection of fish raw materials in order to determine the eating properties or other use of fish products. Sanitary and parasitological study of the fish from the closed and open water bodies of the Astrakhan Oblast was carried out using perch (Perca fluviatilis L.) as an example. There were studied 60 fish specimens (by 10 specimens in the autumn, winter, spring periods of 2018-2019) caught from the Sarbai River and the Shuralinskoye reservoir, with average weight of 110-182 g and length of 15-25 cm. There have been found dangerous nematodes (Anisakidae) and nematodes (Eustrongylides) – parasites that are not dangerous to human health, but significantly spoil the fish marketability. According to the results of comparative analysis of the extensiveness and permissible average number of parasites per 1 kg of fish, depending on the season and the type of reservoir, it was inferred that the Shuralinskoye reservoir is a safer reservoir in terms of the prevalence of helminthes in perch than the Sarbai River. The fish from the reservoir can be eaten after sculling, gutting and the appropriate decontamination methods. The dynamics of fish parasites occurrence has been found to depend on the type of the water body and the season.