Epizootological condition of reservoirs of the Volga Federal District for invasive diseases

Relevance. The widespread prevalence of postdiplostomiasis and the high prevalence of parasite invasion of aquatic organisms, on the one hand, and the popularity in the diet of the population of fish products harvested by amateur fishermen and not passed veterinary and sanitary examination, on the other hand, determine the high probability of harm to human health and emphasize the relevance of this parasitic disease and the need to monitor its prevalence in the waters of reservoirs — popular fishing grounds. Methods. From May to June 2023, control fishing was carried out in 12 reservoirs of the Volga Federal District. All the fish caught were carefully examined for the presence of characteristic clinical signs of postdiplostomosis on the body. In case of detection of the latter (in order to confirm the diagnosis), a microscopic examination was performed. Results. It was found that out of 12 fishing sites, only 5 turned out to be safe for postdiploidomiasis. The extent of fish invasion by metacercariae was 100% in two fishing sites. The extent of the invasion differed depending on the type of fish. For example, 100% of perches caught on the Volga River section (in the vicinity of the village of Sosnovka) were affected by metacercariae, and all individuals of walleye turned out to be healthy. The well-being of two sections of the water area located in close proximity to each other (even one reservoir) may differ significantly. For example, the extent of invasion of fish caught in the Volga River area near the village of Bags (fishing site No. 4) was 100%, and in the fishing site No. 5 located in the immediate vicinity it was only 25%.

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