Metacercariae of centrocestus formosanus (Trematoda: Heterophyidae) in australoherosfacetus (Pisces: Cichlidae) in Brazil

Abstract

Heterophyid metacercariae were found in the gills of Australoheros facetus (Jenyns, 1842) collected from the Pampulha reservoir, Belo Horizonte, Minas Gerais, Brazil, between February and April 2010. The cysts were counted and used to perform experimental studies (artificial excystment and infection of mice). Fifty specimens of A. facetus were analyzed and it was found that the prevalence of infection was 100% and mean infection intensity was 134metacercariae/fish (range:4-2,510). Significant positive correlations were seen between total fish length and intensity of infection; between fish weight and intensity of infection, and between parasite density and fish length. Morphological analyses on metacercariae and adult parasites obtained from experimentally infected mice made it possible to identify Centrocestusformosanus (Nishigori, 1924). This is the first report of C. formosanus in A. facetus in Brazil.