Santos, Maria da Conceição Alves dosSobral, Gabriel Almeida2026-02-242026-02-242025-12-18SOBRAL, G. A.; SANTOS, M. C. A.; PEREIRA, S. L.; COSTA, F. Z. Conhecendo a fauna parasitária em aracus (Leporinus agassizii Steindachner, 1876) provenientes da pesca artesanal no rio Jauaperi em Roraima. 2025. Trabalho de Conclusão de Curso (Graduação em Ciências Biológicas) - Instituto Federal de Roraima. Boa Vista, 2025.https://repositorio.ifrr.edu.br/handle/123456789/319Leporinus agassizii is a freshwater fish belonging to the family Anostomidae, popularly known in Brazil as “Aracu-cabeça-gorda.” This species has a wide distribution in South America, occurring in the Amazon Basin (Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela), and holds both economic and nutritional importance for artisanal fishers. The present study aimed to characterize the parasitic fauna of L. agassizii in a freshwater ecosystem. Specimens were collected in October 2022 in the municipality of São João da Baliza, on the Jauaperi River, in the state of Roraima. The analyses were carried out at the Laboratory of Aquatic Organisms of the Amazon at the Brazilian Agricultural Research Corporation of Roraima (Embrapa/RR). For each specimen, a necropsy record was completed with biometric data (weight and length), collection site, the name of the examiner, and the number and attachment site of each parasite group. A total of 208 parasites were collected from 26 infected hosts, belonging to three taxonomic groups: eleven Monogenea, one hundred ninety-two Nematoda, and five Copepoda. Previous studies have reported only one parasitic association in L. agassizii: a monogenean, Rhinoxenus euryxenus, found on the gill filaments. This study reports, for the first time, copepods and monogeneans parasitizing the nasal cavities of L. agassizii, as well as nematodes in the digestive tract. The present study highlights the importance of understanding the parasitic biodiversity of freshwater fish in the neotropical region, reporting new occurrences. The findings reinforce the relevance of L. agassizii as a host of ectoparasites and endoparasites, emphasizing the importance of parasitological monitoring and contributing to the knowledge of Amazonian ichthyoparasitology, as well as to sanitary management strategies, conservation efforts, and a broader understanding of the aquatic fauna of Roraima.pt-BRAttribution-NonCommercial-NoDerivs 3.0 BrazilAracu-cabeça-gordaAmazôniaCopepodaMonogeneaNematodatcc_graduacaoCIENCIAS BIOLOGICAS::PARASITOLOGIACIENCIAS BIOLOGICAS