Análise comparativa das comunidades parasitárias de quatro espécies de Siluriformes (Pisces) do Alto Rio São Francisco, Minas Gerais, Brasil

Abstract

Specimens of Conorhynchos conirostris (Valenciennes, 1840), Duopalatinus emarginatus (Valenciennes, 1840), Pimelodus pohli Ribeiro & Lucena, 2006 and Cephalosilurus fowleri (Haseman, 1911) endemic fishes the river São Francisco, were collected from the upper São Francisco River, Minas Gerais, downstream from the Três Marias Dam (18 ° 12'32'' S and 45 º 15'41''W), from April 2008 to January , 2012. Twenty three species of parasites were found: Demidospermus uncusvalidus, Scleroductus sp., Pavanelliella pavanellii, metacercariae Austrodiplostomum compactum, Creptotrema creptorema, Crepidostomum platense, Iheringtrema iheringi, Karipharynx sp. Prosthenhystera obesa, metacestodes and plerocercodes of Proteocephalidea, Contracaecum sp. Cucullanus sp. Hysterothylacium sp., Procamallanus (Spirocamallanus) sp1., Procamallanus pimelodus larvae, adults of Cucullanus caballeroi, Cucullanus zungaro, Goezia brevicaeca, Procamallanus (S.) sp2., P. freitasi, Paracapillaria rhamdiae, Philometra sp. and Neoechinorhynchus pimelodi. The host sex did not influence parasite indexes. The total length and weight of the hosts had some influence on the parasite indexes. Parasite communities of C. conirostris, D. emarginatus, P. pohli and C. fowleri were characterized by a low number of central species and few significant interspecific associations. Austrodiplostomum compactum, Contracaecum sp. and N. pimelodi were common on parasite communities of four hosts studied. The parasitics communities of these siluriformes were analyzed in first time with the exception of C. conirostris. Iheringtrema iheringi, Kalipharynx sp., C. caballeroi, G. brevicaeca and P. rhamdiae constitute new records for the São Francisco River, expanding their geographic distributions and their host‟s lists.