Digenea in the surubim Pseudoplatystoma corruscans (Spix and Agassiz, 1829) (Siluriformes: Pimelodidae) of the upper São Francisco River, State of Minas Gerais, Brazil

Abstract

The specimens of surubim, Pseudoplatystoma corruscans (Spix and Agassiz, 1829), an important food fish with high commercial value in the Upper São Francisco River, were collected downstream from the Três Marias Dam, in the municipality of Três Marias, State of Minas Gerais, Brazil. Thirty-six individuals were examined and among the parasites, four species of Digenea were found: Witenbergia witenbergi Vaz, 1932 and Tylodelphys sp. (metacercarie), both with prevalence above 10%, followed by Acanthostomum gnerii (Szidat, 1958) and Acanthostomum sp.. The total length of the hosts did not influence the parasite prevalence. Witenbergia witenbergi occurred only in female hosts and the abundance of Tylodelphys sp. was higher in the males. These Digenea were recorded for the first time in P. corruscans, and their known geographic distribution has been expanded to the São Francisco Basin in Brazil.<br>Espécimes de surubim, Pseudoplatystoma corruscans (Spix e Agassiz, 1829), importante peixe na pesca profissional e de maior valor comercial, do Alto Rio São Francisco, foram coletados à jusante da barragem de Três Marias, município de Três Marias, Minas Gerais. Foram examinados 36 indivíduos e dentre outros parasitos, foram encontradas quatro espécies de Digenea: Witenbergia witenbergi Vaz, 1932 e Tylodelphys sp. (metacercárias) ambas com prevalência superior a 10%, seguidas por Acanthostomum gnerii (Szidat, 1958) e Acanthostomum sp.. O comprimento total dos hospedeiros não influenciou a prevalência e a abundância parasitária. Witenbergia witenbergi ocorreu apenas em hospedeiros fêmeas e a abundância de Tylodelphys sp. foi mais elevada nos hospedeiros machos. Esses Digenea foram registrados pela primeira vez em P. corruscans e tiveram sua distribuição geográfica conhecida ampliada para a bacia do São Francisco, Brasil

Helminth fauna parasitizing Pimelodus pohli (Actinopterygii: Pimelodidae) from the upper São Francisco River, Brazil

“…In the São Francisco River Basin, the records on the parasite fauna of pimelodids were established for Conorhynchos conirostris (Valenciennes, 1840) by Pinto et al (1974), Pinto and Noronha (1976), Vicente et al (1985), and Brasil-Sato and Santos (2005); for Pseudoplatystoma corruscans (Spix & Agassiz, 1829) by Rego and Gibson (1989), Kohn et al (1997), and Corrêa and Brasil-Sato (2008); for Bergiaria westermanni (Lütken, 1874) by Moreira et al (1991) and Vicente and Pinto (1999); for P. maculatus by BrasilSato and Pavanelli ( , 1999Pavanelli ( , 2000Pavanelli ( , 2004, Brasil-Sato (2003), and Monteiro et al (2010); and for P. pohli by Martins et al (2012). In this last work, the authors have established the first record of a parasite species, Prosthenhystera obesa (Diesing, 1850), in the gall bladder of P. pohli.…”

Fauna parasitária dos híbridos siluriformes cachapinta e jundiara nos primeiros estágios de desenvolvimento

“…Entre os híbridos, houve maior parasitismo por metacercárias em alevinos de cachapinta. Corrêa & Brasil-Sato (2008) descreveram a ocorrência dos digenéticos Witenbergia witenbergi, Tylodelphys sp., Acanthostomum gnerii e Acanthostomum sp. em pintado (P. corruscans) oriundo do Rio São Francisco, com menor prevalência do que a observada no presente trabalho.…”

Some factors affecting metacercarial infections in Oreochromis niloticus collected from brackish water, Ismailia, Egypt

“…Chappell (1969) also revealed that the infestation level of parasites attained a negative relationship with the length of host fish. On the other hand, Corrêa and Brasil-Sato (2008) stated that the total length of the hosts does not influence the parasite prevalence. Results show that the prevalence was higher in female fish (77.57%) compared to male one (70.73%) (Table 4).…”