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Material collected from the fishes from the dams and fish farms of the Departamento Nacional de Obras c ontra as Secas (DNOCS) and from the tanks of the Itaipu Hydroelectric Station was examined in order to analyze the index and the infestation of Monogenea. Specimens of tambaqui ( Colossoma macropomum ), pacu ( Piaractus mesopotamicus ), pirapitinga ( Piaractus brachypomus ) and the hybrid tambacu ( Colossoma macropomum X Piaractus mesopotamicus ) were examined and five species of Monogenea were identified including: Mymarothecium viatorum Boeger, Piasecki & Sobecka, 2002, Mymarothecium boegeri Cohen & Kohn, 2005, Notozothecium euzeti Kritsky, Boeger & Jegu, 1996, Notozothecium januachensis Belmont-Jegu, Domingues & Martins, 2004 and Anacanthorus penilabiatus Boeger, Husak & Martins, 1995 . Infection prevalence and intensity of infection and new data concerning Monogenea are presented. Key words: Monogenea, Parasites, Brazil, freshwater fishes.

On Dactylogyridae (Monogenea) of four species of characid fishes from Brazil