No abstract

Ten endoparasite species found in Pygocentrus piraya, which is a piranha species native to São Francisco river, were collected from 108 fi sh caught in Três Marias reservoir in 2004 and 2005, namely: Digenea -Austrodiplostomum sp. (metacercariae); Eucestoda -Proteocephalidae gen. sp. (plerocercoids); and Nematoda -Procamallanus (Spirocamallanus) inopinatus, Cystidicoloides fi scheri and Capillostrongyloides sentinosa (adults); Spinitectus rodolphiheringi (juvenile); Hysterothylacium sp., Contracaecum sp. Type 1 , Spiroxys sp. and Goezia sp. (larvae). In helminth fauna, P. (S.) inopinatus has shown higher prevalence and dominance. Fish sex has infl uenced the prevalence of Hysterothylacium sp., which was higher in female specimens. Longer total length of fi sh has positively infl uenced the abundance of C. sentinosa and Hysterothylacium sp.. The rainy season has favored parasitic indices, mainly P. (S.) inopinatus abundance, as well C. sentinosa and Hysterothylacium sp. prevalence and abundance. There were co-occurrences between adult and some larval nematodes. Endemic piranhas, as well as fi nal hosts, are important intermediate and/or paratenic hosts, given the relevant number of larvae (proteocephalideans and nematodes) of heteroxene cycle found in them. Proteocephalidae gen. sp., C. sentinosa, Hysterothylacium sp., Contracaecum sp. Type 1 , Goezia sp. and S. rodolphiheringi are new records parasitizing P. piraya in São Francisco basin.

Communication [Comunicação]

No abstract

Rhabdochona (Rhabdochona) acuminata (Molin, 1860) (Rhabdochonidae) parasita o intestino de várias espécies de peixes e apresenta uma ampla distribuição geográfica. O presente estudo registra pela primeira vez a ocorrência de espécimes adultos deste helminto em Acestrorhynchus britskii Menezes, 1969 e Acestrorhynchus lacustris Lütken, 1875 (Acestrorhynchidae), coletados no Reservatório de Três Marias, Alto Rio São Francisco, Estado de Minas Gerais, Brasil. Nesta mesma localidade, larvas de Rhabdochona sp. foram encontradas em peixes forrageiros simpátricos, Tetragonopterus chalceus Spix & Agassiz, 1829 e Triportheus guentheri (Garman, 1890) potenciais presas dos acestrorhynchídeos piscívoros e relacionadas como possíveis hospedeiros intermediários ou paratênicos dessa espécie de parasito. Os índices parasitários de R. acuminata não foram influenciados pelo sexo e nem pelo comprimento total desses hospedeiros piscívoros.