Abstract
Based on studies (2016-2022) of diphyllobothriasis infestation of animals in the territory of the Commander Islands National Park, it was revealed that the average extent of Bering Arctic Fox invasion was 37.3%, with seasonal fluctuations: winter – 42.7%, spring – 36.6%, summer – 34.9% (fecal helminthoscopy, n=351). The American mink is infected with diphyllobothriids with an invasion intensity of 26.5%. Helminthological autopsies (n=11) revealed strobils of Diphyllobothrium spp. - 5-15 specimens, 20-70 cm long, in 5 Bering Arctic foxes. At the autopsy of 10 individuals of the American mink and 1 individual of the Mednovsky Arctic fox, no diphyllobothriids were found, as well as during helminthoscopic examination of the feces of the Mednovsky Arctic fox (n=37). Encapsulated plerocercoids were detected in the spawning individuals of Oncorhynchus gorbusha from the territory of Bering Island. Key words: National Park "Commander Islands", diphyllobothriids, prevalence, Bering Arctic fox, Mednovsky Arctic fox, American mink.
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