Abstract
This study has established the composition of roach parasites in inland waters of Lithuania. 4,676 roach specimens from 13 rivers, 23 lakes, the Kaunas hydropower plant reservoir and the Curonian Lagoon (61 study sites in total) were examined for parasites in 2005–2008. The performed fish necropsy examination revealed a total of 28 parasite species. The detected parasites represent nine higher taxa: Ciliophora (6 species), Monogenea (3), Digenea (7), Cestoidea (5), Crustacea (3), Nematoda (1), Acanthocephala (1), Hirudinea (1) and Bivalvia (1). All of the found parasites are local species already recorded in roach from Lithuania. Parasite prevalence and intensity per host varied a lot among the study sites. The most frequent parasites were Digenea: Diplostomum sp. (Nordmann, 1832), Posthodiplostomum cuticola (Nordmann, 1832) and Tylodelphys clavata (Nordmann, 1831) and Monogenea: Dactylogyrus sp. (Diesing, 1850). The parasitological examination of roach showed a significant variation in the prevalence of ...
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