Abstract
The endoparasite fauna of Astyanax fasciatus from the upper São Francisco river was investigated and ecological parameters and morphological and morphometric data on the parasites are presented. A total of 74 specimens of banded astyanax were collected downstream from the Três Marias dam, municipality of Três Marias, Minas Gerais (18°12'32"S, 45°15'41"W) in January 2011 and January 2012. Eleven taxa of Nematoda were found: Contracaecum sp.; Hysterothylacium sp.; Goezia sp.; Brevimulticaecum sp.; Procamallanus sp.; Procamallanus (Spirocamallanus) saofranciscencis; Cystidicoloides sp.; Spinitectus rodolphiheringi; Rhabdochona sp.; Spiroxys sp.; and Eustrongylides sp.. The fauna of A. fasciatus consisted of by larval specimens of Contracaecum sp., Hysterothylacium sp., Brevimulticaecum sp., Cystidicoloides sp., and Spiroxys sp., and by adult specimens of P. saofranciscencis, whose prevalence was greater than 10%. Thus, this fish acts as an intermediate host of some species of larval nematodes especially, Anisakidae and Acanthocheilidae (Brevimulticaecum sp., new host record and new locality). It participates in transmitting species such Rhabdochona sp. to carnivorous fish and also acts as a definitive host for P. saofranciscencis and S. rodolphiheringi in the upper São Francisco river.
Highlights
Astyanax fasciatus (Cuvier, 1819) is popularly known as the banded astyanax and it is an abundant species in several drainage basins in the Americans (FROESE & PAULY, 2013)
The fauna of A. fasciatus consisted of by larval specimens of Contracaecum sp., Hysterothylacium sp., Brevimulticaecum sp., Cystidicoloides sp., and Spiroxys sp., and by adult specimens of P. saofranciscencis, whose prevalence was greater than 10%
The parasite fauna of A. fasciatus consisted of eleven nematode species, which are presented in Table 1 with their respective parasitic indeces
Summary
Astyanax fasciatus (Cuvier, 1819) is popularly known as the banded astyanax and it is an abundant species in several drainage basins in the Americans (FROESE & PAULY, 2013). It is classified as a foraging species, and it is well distributed along the São. Francisco river (BUCKUP et al, 2007), serving as an important food source for larger fish. Nematodes of Astyanax fasciatus in the São Francisco river, Brazil identified larvae of Brevimulticaecum sp., Contracaecum sp. Salgado-Maldonado (2008) discovered Procamallanus neocaballeroi (Caballero-Deloya, 1977) and Procamallanus rebecae (Andrade-Salas, Pineda-López, & García-Magaña, 1994) in Central America
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