| Summary: | The information has been collected and analyzed on the causative agent of the dangerous fish disease bothriocephalosis, which currently has more than 20 synonyms in the literature. The disease is currently reported worldwide, with the exception of Antarctica. When infecting fish, the pathogen is localized in the intestines and, first of all, has a negative mechanical effect, moreover, it affects the growth of fish. The size of the parasite adapts to the size of the host organism. Anthelmintics are used as methods of combating the disease, as well as biological control methods based on interrupting the life cycle of the parasite. The southern region of the Russian Federation is the most favorable territory for the development of bothriocephalosis. Despite this, the region as a whole has a positive status for this disease. Over the past 3 years, according to the official data of regional veterinary services, only 6 cases of the establishment of restrictive measures (quarantine) for bothriocephalosis in relation to fish farms have been noted.
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