RESUMOO presente estudo investiga a presença de diplostomídeos parasitas em dois peixes curimatídeos, Potamorhina latior e Potamorhina pristigaster, além de listar todos os peixes reportados como hospedeiros para Austrodiplostomum compactum na Amazônia brasileira. Os peixes foram coletados em oito lagos de várzea do rio Solimões, no período de fevereiro de 2013 a dezembro de 2015. Foram analisados cem indivíduos de P. latior e sessenta e nove indivíduos de P. pristigaster, nos quais foram encontrados nos olhos dois espécimes de A. compactum em P. latior e apenas um espécime em P. pristigaster. Com os novos registros um total de oito espécies de peixes são citadas como hospedeiras para A. compactum na Amazônia brasileira incluindo Acestrorhynchus falcirostris, Cichla monoculus, Plagioscion squamosissimus Pterygoplichthys pardalis e Pygocentrus nattereri. As infecções ocorrem em diferentes órgãos: brânquias, musculatura, mesentério, olhos, gônadas, cavidade visceral e rins. Verifica-se que A. compactum apresenta baixa especificidade pelos hospedeiros e estima-se que os baixos índices parasitários associados a amostras de pequeno tamanho subestimem as diversas outras espécies de peixes amazônicos que albergam estes diplostomídeos. PALAVRAS CHAVE:Austrodiplostomum; Diplostomidae; Lagos de várzea; Parasitos de peixes. AUSTRODIPLOSTOMUM COMPACTUM (LUTZ, 1928) METACERCARIAE IN FISH FROM BRAZILIAN AMAZON FLOODPLAIN LAKES ABSTRACTThis study investigates the presence of diplostomids parasites in two curimatids fish, Potamorhina latior and Potamorhina pristigaster and lists all the fish reported as hosts for Austrodiplostomum compactum in the Brazilian Amazon. Fish were collected in 8 Solimões river floodplain lakes, from February 2013 to December 2015. One hundred individuals of P. latior and sixty-nine individuals of P. pristigaster were analyzed, in which were found two specimens of A. compactum in the eyes of P. latior and only one specimen in the eye of P. pristigaster. With these two new records, a total of eight fish species are cited as hosts species for A. compactum in the Brazilian Amazon including: Acestrorhynchus falcirostris, Cichla monoculus, Plagioscion squamosissimus Pterygoplichthys pardalis and Pygocentrus nattereri. The Infections occur in different organs: gills, muscles, mesentery, eyes, gonads, visceral cavity and kidneys. A. compactum has low specificity for fish host species and it is estimated that low parasitic indices associated with small samples underestimate other Amazonian fish species that harbor these parasites.
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