Nematodes of Astyanax fasciatus (Actinopterygii: Characidae) and their parasitic indices in the São Francisco river, Brazil

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.

ENDOPARASITOS DE Gymnotus sp. (GYMNOTIFORMES: GYMNOTIDAE) DE ISQUEIROS COMERCIAIS NA BACIA DO PANTANAL, BRASIL CENTRAL

“…In a natural environment, R. rondoni has been reported in different river basins, Paraguay, Paraná, Amazonas and São Francisco (COSTA, 1963), parasitizing fish of different families Characidae, Cynodontidae, Doradidae, Heptapteridae, and Pimelodidae (KOHN et al, 2011), R. rondoni is reported for the first time parasitizing Gymnotus sp. In Brazil four species of Goezia sp were described in different species of fish (VIEIRA-MENEZES et al, 2017), but in the genus Gymnotus sp there are no reports of parasitism by this species. Though in the present study the prevalence of Goezia sp infection was low (3.03%), in cases of massive infection, causing gross lesions and high mortality among the fish (VIEIRA-MENEZES et al, 2017).…”

“…In Brazil four species of Goezia sp were described in different species of fish (VIEIRA-MENEZES et al, 2017), but in the genus Gymnotus sp there are no reports of parasitism by this species. Though in the present study the prevalence of Goezia sp infection was low (3.03%), in cases of massive infection, causing gross lesions and high mortality among the fish (VIEIRA-MENEZES et al, 2017).…”

Parasitic helminths of the non-native serrasalmid fish Metynnis lippincottianus from the Três Marias Reservoir, Southeast Brazil

“…During the necropsies we found the plerocercoids forming small masses within the peritoneal cavity and attached to the mesentery of the affected fish. In the São Francisco River basin, several species of fish are parasitized by these plerocercoid larvae (BRASIL-SATO, 2003;SABAS & BRASIL-SATO, 2014;ALBUQUERQUE et al, 2016;DUARTE et al, 2016;VIEIRA-MENEZES et al, 2017). Based on these results, we suggest that M. lippincottianus harbors generalist plerocercoids.…”

ENDOPARASITES INFECTION IN BLOOD COCKLE (Anadara granosa) IN ACEH BESAR WATERS, INDONESIA

“…In several reports, Spiroxys sp. has also been found in several freshwater fish (Santos et al, 2009;Galaviz-Silva et al, 2013;Vieira-Menezes et al, 2017;Mhaisen et al, 2018;Šimková et al, 2019), farmed fish (Soler-Jiménez et al, 2017), turtles (Rakhshandehroo et al, 2020) and some marine fishes (Öktener, 2016). However, in this study, Spiroxys sp was also found in the blood cockles' gonads.…”