Composição e estrutura das comunidades parasitárias do Acará Geophagus brasiliensis (Quoy e Gaimard, 1824) e do Apaiarí Astronotus ocellatus (Cope, 1872) do Rio Guandu, Estado do Rio de Janeiro, Brasil

Abstract

Between December 2004 to November 2005, were collected 50 specimens of Geophagus brasiliensis (Quoy e Gaimard, 1824) and 35 specimens of Astronotus ocellatus (Cope, 1872) from the River Guandu, near to the Station of Treatment of water (ETA) (22°48'32"S, 43º37'35"W), State of Rio de Janeiro, for the study of their communities of metazoan parasites. In G. brasiliensis, nine species of metazoan parasites were collected: 3 digeneans, 1 nematode, 2 hirudineans, 2 acantocephalans and 1 gloquidian. Most of parasite specimens collected were digeneans (95.9 %), being Posthodiplostomum macrocotyle Dubois, 1937 (metacercariae) founded in the eyes the more prevalent species (88.0%) and with highest mean intensity value (12.4), followed for the metacercariae of Austrodiplostomum compactum (Lutz, 1928) (metacercariae) and the hirudinean of family Glossiphoniidae showed prevalence of 14.0% and 10.0% respectively. In A. ocellatus, six species of metazoan parasites were collected: 1 monogenean, 1 nematode, 1 hirudinean, 1 acantocephalan, 1 crustacean, and 1 gloquidian. Most of parasite specimens collected were monogenetic (91.9 %), being Gussevia sp. founded in the gills the more prevalent species (71.4%) and with highest mean intensity value (17.6), followed for the acanthochepalan Polymorphus sp. showed prevalence of 17.1%. The parasite species of G. brasiliensis and A. ocellatus showed the typical aggregated pattern of distribution.