Helminth parasites of leporinus octofasciatus and leporinus amblyrhynchus (characiformes, anostomidae) from the sapucaí-mirim river, southeastern Brazil

• Localización: The Biologist, ISSN-e 1994-9073, ISSN 1816-0719, Vol. 10, Nº. Extra 2 (julio-diciembre), 2012
• Idioma: portugués
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• Resumen

  • Anostomidae is an important family of freshwater fish, comprising about 110 species distributed along Central and South America. Leporinus sp. is included in this family and is commonly known in Brazil as �piau�, representing an important source of income for fishermen. In the aquatic environment, the penetration of pathogens is facilitated and fish can be infected by numerous parasite species. Therefore, a great number of fish species can act as intermediate or definitive hosts of several parasite species. Studies estimating healthiness of species inhabiting aquatic ecosystems have expanded in Brazil and they are fundamental to ensure the health of such species, and human populations that consume these organisms. The aim of this study was to report the occurrence of helminth parasites of Leporinus octofasciatus and Leporinus amblyrhynchus from the Sapucaí-Mirim River, São Paulo State, Brazil. Four specimens of L. octofasciatus and five specimens of L. amblyrhynchus were collected on March 2012. All fish specimens were parasitized by at least one helminth species (prevalence = 100%). Both fish species evaluated was infected by Procamallanus (Spirocamallanus) inopinatus in the intestine and Nematoda larvae morphotype 1 in the swimbladder. Nematoda larvae morphotype 2 in the serosa of liver, Austrodiplostomum compactum metacercariae in the eyes (vitreous humor), Diplostomidae metacercariae in the eye lenses, Rhinoxenus sp. in the nostrils, Protorhinoxenus sp. in the body surface, and Urocleidoides sp. in the gills were also found in L. octofasciatus. In addition, Procamallanus sp. larvae in the intestine and Dactylogyridae monogenoid in the gills were also observed in L. amblyrhynchus. This is the first report of these parasites in the studied fishes, excepting for P. (Spirocamallanus) inopinatus in L. octofasciatus, as well as the first record of these parasites in the Sapucaí-Mirim River.