Parasitic community of Fransciscodoras marmoratus (Reinhardt, 1874) (Pisces: Siluriformes, Doradidae) from the upper São Francisco river, Brazil

Abstract

One hundred and thirteen specimens of Franciscodoras marmoratus (Reinhardt, 1874) were collected in the upper São Francisco River (18° 12' 32" S, 45° 15' 41" W, state of Minas Gerais) between September, 1999 and January, 2004 to investigate their parasite fauna. From this total, 45 (39.8%) were afflicted by at least one parasite species. The parasitic richness consisted of six species represented by Hirudinea (n = 20), Monogenoidea (n = 25), Eucestoda (n = 55), Nematoda (n = 1, n = 2) and Acanthocephala (n = 41) found in the dry and wet periods making a total of 144 specimens. Proteocephalus renaudi Chambrier & Vaucher, 1994 was the only species with prevalence higher than 10% and a typical aggregate distribution pattern. The prevalence, intensity and abundance of P. renaudi were not influenced by the total length or sex of the hosts or by the collection periods. The relative condition factor indicated that the health of the P. renaudi hosts was not significantly affected in relation to fish not infected by parasites. The fish stocked in tanks before necropsy were opportunistically infested by Lernaea cyprinacea Yashuv, 1959. The various parasites found indicate that F. marmoratus is omnivorous and a potential definitive host. The parasite species, except for Acanthocephala, have expanded their known geographic distribution to the São Francisco River Basin. The parasite community was considered isolationist because of the low endoparasite diversity, infrapopulations with low intensity, lack of evidence of parasite interactions and sparse signs of parasite aggression against their hosts.Keywords: Franciscodoras marmoratus, parasitic community, relative condition factor, freshwater fish parasites, São Francisco River. RESUMO

Parasite Community of Cichla kelberi (Perciformes, Cichlidae) in the Três Marias Reservoir, Minas Gerais, Brazil

“…Lacerda et al (2013b) accepted this hypothesis when they verified that both species of proteocephalids present in C. piquiti Kullander & Ferreira, 2006, from the original environment (Lajeado Reservoir and São Salvador, Tocantins River) continued to parasitize those hosts that were introduced in new places (Jupiá and Itaipu Reservoirs, Paraná River). All of the parasite species that were analyzed showed a typical pattern of aggregated or superdispersed distribution, which are common patterns in studies on parasites of freshwater fish (MACHADO et al, 2000;GUIDELLI et al, 2003;SANTOS;BRASIL-SATO, 2006). …”

“…Subsequently, these fish acquire new parasite species in their new habitat MORAND, 2004). Since C. kelberi is an exotic species, it is possible that the proteocephalid cestodes that were found had been introduced in conjunction with their hosts, because no other species of fish from the Três Marias Reservoir in the upper São Francisco River region, whose parasitic fauna was investigated, presented with such helminths SANTOS, 2003SANTOS, , 2005SANTOS;BRASIL-SATO, 2006;SANTOS, 2008;MONTEIRO et al, 2009). Lacerda et al (2013b) accepted this hypothesis when they verified that both species of proteocephalids present in C. piquiti Kullander & Ferreira, 2006, from the original environment (Lajeado Reservoir and São Salvador, Tocantins River) continued to parasitize those hosts that were introduced in new places (Jupiá and Itaipu Reservoirs, Paraná River).…”

Parasite diversity in Oxydoras niger (Osteichthyes: Doradidae) from the basin of Solimões River, Amazonas state, Brazil, and the relationship between monogenoidean and condition factor

“…Dias et al (2004) and Santos and Brasil-Sato (2006) did not observe any negative effect of the infection by Rondonia rondoni Travassos, 1920 (Nematoda) on the condition factor of P. granulosus and Franciscodoras marmoratus Reinhardt, 1874. On the other hand, the monogenoidean Cichlidogyrus Paperna, 1960 showed a negative correlation to the prevalence and parasitism in cultured tilapia Oreochromis niloticus Linnaeus, 1758 (Lizama et al, 2007).…”

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

“…The biometric data of siluriform hosts have been analyzed and were related to the parasitic indexes in several works (MACHADO et al, 1994;PAVANELLI, 2004;SANTOS, 2005;MOREIRA et al, 2005;BRASIL-SATO, 2006;BACHMANN et al, 2007). In the São Francisco River, parasitic indexes have been minimally influenced by fish size, and the possible cumulative effect of parasites, as proposed by Rohde (1993), has not been observed in parasite communities of fish in that hydric system.…”