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Tropical fishes like Leporinus macrocephalus Garavello & Britski, 1988 (piauçu) and the hybrid tambacu (Piaractus mesopotamicus Holmberg, 1887 pacu male x Colossoma macropomum Cuvier, 1818 tambaqui female) were experimentally infected with four inocula of trophonts of Ichthyophthirius multifiliis Fouquet, 1876 (Protozoa, Ciliophora) and the infection level was evaluated. Each one of twelve experimental units consisted of a tank with 200 liters of water and two specimens of each kind of fish. The following treatments were designed to each tank, in triplicate: 8, 16,32 and 64 trophonts. After 8 days of exposure the fishes were killed and the number of trophonts was counted at a stereoscopic microscope. This assay showed to be feasible at tropical conditions and was able to show that tambacu was more susceptiblc than piauçu

revista brasileira de zoologia

Metodologia de infecção experimental e grau de susceptibilidade do híbrido "tambacu" e Leporinus macrocephalus Garavello &amp; Britski (Osteichthyes, Anostomidae) a quatro inóculos de trofozoítos de Icthyophthirius multifiliis Fouquet (Protozoa, Ciliophora)