Abstract
In the freshwater ecosystems of Brazil can be found high biodiversity of fish, about 5160 species. However, the Jacaré-Pepira River, located in the state of São Paulo, Brazil, presents a diversity of fish still to be explored in ichthyological studies. Metazoan parasites of Pimelodus maculatus and Rhamdia quelen were qualitatively and quantitatively diagnosed. Ten species of parasites (Demidospermus sp., D. majusculus, D. bidiverticulatum, D. paravalenciennesi, Ameloblastella paranaensis, Scleroductus sp., Riggia sp., Austrodiplostomum compactum, Helobdella sp. and Neochinorhynchus pimelodi) were collected in P. maculatus and eight species of parasites (Aphanoblastella robustus, A. mastigatus, Phyllodistomum rhamdiae, Crocodilicola pseudostoma, Henneguya jundiai, Contracaecum sp., Rhabdochona sp. and Capillariidae gen. sp.) were collected in R. quelen. All parasites presented aggregate distribution. A significant correlation was observed in P. maculatus concerning the weight with the prevalence of ectoparasite D. majusculus; however, R. quelen showed a relation to the length and weight with the abundance of ectoparasite A. mastigatus and endoparasites. The parasitic community of P. maculatus and R. quelen was characterized by high diversity, high richness, and low uniformity.
Highlights
The Tietê/Jacaré Hydrographic Basin is located in the center of the state of São Paulo and comprises three main rivers: Tietê, Jacaré-Guaçu, and Jacaré-Pepira
It is essential to carry out studies to determine parasitic diversity and contribute to global biodiversity; the objective of this study was to analyze the parasitic fauna of P. maculatus and R. quelen from the Jacaré-Pepira River, checking the quantitative data, diversity and possible influences of host length, weight, and sex on parasitism
A total of 1796 and 285 parasites were collected from P. maculatus and R. quelen, respectively
Summary
The Tietê/Jacaré Hydrographic Basin is located in the center of the state of São Paulo and comprises three main rivers: Tietê, Jacaré-Guaçu, and Jacaré-Pepira. The siluriform Pimelodus maculatus Lacepède 1803 is commonly known as “mandi”, “mandi-amarelo” or “bagre pintado”, has geographical distribution restricted to South America, is characterized as opportunistic species, is active at night, and has an omnivorous feeding habit, and adaptation to a varied diet, consuming seaweed, insects, crustaceans or mollusks (Brasil-Sato & Pavanelli 2004, An Acad Bras Cienc (2021) 93(2). Bachmann et al 2007, Albuquerque et al 2008, Froese & Pauly 2018) and the siluriform Rhamdia quelen Quoy & Gaimard 1824 is commonly known as “Jundiá”, is distributed in Central and South America, as well as in southern Brazil, has benthonic behavior and nocturnal and omnivorous habit with a carnivorous tendency, consuming fish, crustaceans, insects, plants or mollusks (Morais 2005, Vianna et al 2005, Froese & Pauly 2018). It is essential to carry out studies to determine parasitic diversity and contribute to global biodiversity; the objective of this study was to analyze the parasitic fauna of P. maculatus and R. quelen from the Jacaré-Pepira River, checking the quantitative data, diversity and possible influences of host length, weight, and sex on parasitism
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