RESUMO
Hypostomus commersoni is a freshwater fish, native to the Paraná River basin, which plays an important role in trophic networks of this system. This study aimed at analyzing the structure of the endohelminth community of H. commersoni from two shallow lagoons in the municipality of Santa Fe, Argentina. In the 51 hosts analyzed, 2103 helminths were found. Hosts from Belgrano Park lagoon were infested with Genarchella genarchella, Saccocoelioides nanii, Raphidascaris (Sprentascaris) sp., and Gorytocephalus elongorchi. Hosts from the Western Urban Nature Reserve lagoon were infested with Thometrema magnifica, Procamallanus (Procamallanus) annipetterae, Raphidascaris (Sprentascaris) sp., Gorytocephalus elongorchi, and Proteocephalidae spp. In both host populations, the prevalence of some parasites was high, and species richness and diversity of component communities were low. The distribution pattern of helminth was aggregated in all cases. No correlation was found between the length of the host and the richness and abundance of endoparasites. The total number of parasites and the specific richness per host in both lagoons did not differ significantly. The findings on G. genarchella, P. (P.) annipetterae, G. elongorchi, and Proteocephalidae spp. were the first records in his host.(AU)
Assuntos
Animais , Peixes-Gato/parasitologia , Helmintos/patogenicidadeRESUMO
We studied gill parasites of Prochilodus lineatus in the San Javier River, which is connected to the Middle Paraná System (Santa Fe, Argentina). In 25 specimens, the parasite prevalence in branchial organs was 92% and the average intensity was 8.3 parasites/infested fish. The parasite community showed no dominance of any taxon, but the family Dactylogyridae represented 60% of the community. We found a significant association between Tereancistrum curimba and Dactylogyridae specimens. The prevalence of the parasites T. toksonum and T. curimba was higher than what has been recorded in the floodplain of the Upper Paraná River, Brazil, demonstrating that the geographic distribution of parasites belonging to Tereancistrum genus is thus expandeing.
Foram estudados os parasitos das brânquias de Prochilodus lineatus, do rio San Javier, Sistema Paraná Médio (Santa Fe, Argentina). Em 25 espécimes de peixes analisados, a prevalência de parasitos foi de 92% e a intensidade média de 8,3 parasitos/peixe parasitado. A comunidade parasitária não mostrou predomínio de um taxón, embora tenha sido observado que 60% da comunidade foi representada pela Família Dactylogyridae. Verificou-se associação significativa entre Tereancistrum curimba e indivíduos da família Dactylogyridae. Os índices de prevalência parasitária de T. toksonum e T. curimba se destacam como sendo superiores aos registrados na planície de inundação do rio Alto Paraná, no Brasil, demonstrando desta maneira expansão da distribuição geográfica de parasitas do gênero Tereancistrum.
Assuntos
Animais , Caraciformes/parasitologia , Brânquias/parasitologia , Argentina , RiosRESUMO
We studied gill parasites of Prochilodus lineatus in the San Javier River, which is connected to the Middle Paraná System (Santa Fe, Argentina). In 25 specimens, the parasite prevalence in branchial organs was 92% and the average intensity was 8.3 parasites/infested fish. The parasite community showed no dominance of any taxon, but the family Dactylogyridae represented 60% of the community. We found a significant association between Tereancistrum curimba and Dactylogyridae specimens. The prevalence of the parasites T. toksonum and T. curimba was higher than what has been recorded in the floodplain of the Upper Paraná River, Brazil, demonstrating that the geographic distribution of parasites belonging to Tereancistrum genus is thus expandeing.