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The invasive fish diseases are widespread in water bodies of Ukraine and cause significant economic losses. They can manifest differently, in particular, pathological changes in the body can lead to death, latent disease, growth and development delay and decreased productivity of fish (Vovk, 2002; Rastiannasab et al., 2016; Golzio et al., 2017). One of the reasons hampering the development of fish farming and increasing fish productivity is ectoparasitic because of these fish diseases (Hemaprasanth et al., 2011; Loboiko, 2012; Benovics et al., 2017). The importance of ichthyoparasitological measuremen is because it studies the overall range of veterinary activities and the increasing connection with the development of fisheries and introduction of new fish farming facilities. Obviously, an objective diagnosis of an invasive disease can only be established by determining the species of its pathogen. Only after diagnosis can the ARTICLE INFO ABSTRACT Article History: Received: Sept. 4, 2020 Accepted: Oct. 30, 2020 Online: Nov. 7, 2020

The natural forage base of ponds and its influence on the development of ectoparasitic invasions in the fish farms of the Lviv region, Ukraine