Infestation of fish by crustacean parasites in reservoirs of Ukraine between 2017–2023

The problem of diseases caused by parasitic crustaceans is timely. The purpose of this research was to analyze the epizootic situation regarding parasitic crustacean diseases (argulosis, lerneosis, ergasilosis, and synergasilosis) in fish farms and natural reservoirs of Ukraine between the years 2017–2023. Conducting such an analysis will allow one to determine the dynamics and spread of these crustaceans on the territory of Ukraine. During the years 2017–2023, the cases of lesions in carp and Prussian carp caused by Lernaea were most often detected, and a decrease in the frequency of cases of argulosis and synergasilosis was observed. During the study period, no cases of parasitism by causative agents of ergasilosis were found. Crustacean diseases (especially lerneosis, and synergasilosis) are diagnosed more often, while parasite carriage is less often diagnosed. Keywords: infestation; fish; crustacean diseases; argulosis; lerneosis; synergasilosis; ergasilosis