A Study of Fish Lice (Argulus Sp.) Infection in Freshwater Food Fish

Abstract

AbstractArgulussp., commonly referred to as fish lice, are crustacean ectoparasites of fishes. The hematophagous parasites attach to and feed off the integument of their hosts. Outbreaks of epizootics have been reported worldwide, causing mass mortalities and having serious economic implications for fish farms and culture efforts.Argulusfish lice may also serve as vectors of infectious diseases and as intermediate hosts of other parasites. Two native European species,A. foliaceusandA. coregoni, as well as the invasive Japanese fish louseA. japonicus,have previously been recorded in Slovakia. This study investigated samples collected at fish farms and culture sites of Common carp (Cyprinus carpioL.), Pike-perch (Sander luciopercaL.) and Brook trout (Salvelinus fontinalisM.) in Eastern Slovakia, as well as samples collected from live fish imported to the Slovak Republic. A quantitative description of the ofArgulussp. was recorded from each locality. Samples from Common carp were identified as the invasiveA. japonicus, and samples from Pike-perch and Brook trout were identified asA. foliaceus. Evidence of a mixed infection of Pike-perch with bothA. foliaceusandA. japonicuswas found in samples from Zemplínska Šírava, which was substantiated by electron microscopic examination. Morphometric characteristics were measured and averages and ranges produced for each species and sex.