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Bras. Parasitol. Vet."],"abstract":"<jats:p>Abstract Aquaculture has been recognized as one of the main solutions to the growing global food demand, as well as a significant resource for addressing the limitations imposed on wild fisheries. The most important fish species for Brazilian fish farming is Colossoma macropomum due to its zootechnical characteristics, economic and cultural importances. In cultivated systems, the presence of parasites can represent a major problem. Under these conditions, parasites of the phyla Acanthocephala and Platyhelminthes are commonly found parasitizing farmed fishes. This study aimed to investigate the helminth fauna and their parasitological indices in cultivated fish farms located in the municipalities of Imperatriz, state of Maranh\u00e3o and in Rio Branco, state of Acre, Brazil. A total of 1,617 specimens of Monopisthocotyla were collected, and, among the endoparasites, 325 specimens belong to the phylum Acanthocephala and 10 specimens belonging to the class Trematoda were identified. The present study expands the known biodiversity and distribution of helminth parasites in South American aquaculture, providing new records for host-parasite associations and geographic locations in the states of Acre and Maranh\u00e3o, Brazil.<\/jats:p>","DOI":"10.1590\/s1984-29612026039","type":"journal-article","created":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T11:50:55Z","timestamp":1788522655000},"source":"Crossref","is-referenced-by-count":0,"title":["Helminth parasites of characiform fishes from farming systems in the states of Acre and Maranh\u00e3o, Western Amazonia and Northeastern regions, Brazil"],"prefix":"10.1590","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2412-887X","authenticated-orcid":false,"given":"Rayane","family":"Duarte","sequence":"first","affiliation":[{"name":"Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil; Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8737-1159","authenticated-orcid":false,"given":"Yuri Costa de","family":"Meneses","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil; Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0684-3389","authenticated-orcid":false,"given":"Marcia Cristina Nascimento","family":"Justo","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-1454-7563","authenticated-orcid":false,"given":"Giovanna Oliveira de","family":"Nigris","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-8920-2219","authenticated-orcid":false,"given":"Gabriela Cristina de Fran\u00e7a","family":"Mendon\u00e7a","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8205-3998","authenticated-orcid":false,"given":"Maralina Torres da","family":"Silva","sequence":"additional","affiliation":[{"name":"Instituto Federal do Acre,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8204-336X","authenticated-orcid":false,"given":"Simone Chinicz","family":"Cohen","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o Oswaldo Cruz,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"530","published-online":{"date-parts":[[2026]]},"reference":[{"issue":"2","key":"ref1","doi-asserted-by":"crossref","first-page":"211","DOI":"10.24039\/rnh201372979","article-title":"Trinibaculum altiparanae sp. n., a new dactylogyrid species (Monogenea) of the Astyanax altiparanae (Osteichthyes: Characidae) in the Peixe River, southeastern Brazil","volume":"7","author":"Abdallah VD","year":"2013","journal-title":"Neotrop Helminthol"},{"issue":"6","key":"ref2","doi-asserted-by":"crossref","first-page":"1689","DOI":"10.1007\/s00436-018-5840-8","article-title":"Distribution of the acanthocephalan Neoechinorhynchus buttnerae and semiquantitative analysis of histopathological damage in the intestine of tambaqui (Colossoma macropomum)","volume":"117","author":"Aguiar LS","year":"2018","journal-title":"Parasitol Res"},{"issue":"3","key":"ref3","doi-asserted-by":"crossref","first-page":"127","DOI":"10.3759\/tropics.23.127","article-title":"Current situation of freshwater aquaculture in the lower Amazon River and the potentiality of development","volume":"23","author":"Aizawa N","year":"2014","journal-title":"Tropics"},{"key":"ref4","series-title":"Protocolos para laborat\u00f3rio: coleta e processamento de parasitos do pescado","author":"Amato JFR","year":"1991"},{"issue":"2","key":"ref5","first-page":"75","article-title":"Patolog\u00edas asociadas a monogeneos branquiales en cachama bajo cultivo","volume":"27","author":"Aragort W","year":"2002","journal-title":"Vet Trop"},{"key":"ref6","series-title":"Anu\u00e1rio Peixe BR da Piscicultura 2025","year":"2025"},{"issue":"1","key":"ref7","doi-asserted-by":"crossref","first-page":"1","DOI":"10.11646\/zootaxa.736.1.1","article-title":"Notozothecium janauachensis n. sp. 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