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The digestive tube of <jats:styled-content style=\"fixed-case\"><jats:italic>P. brachypomus<\/jats:italic><\/jats:styled-content> consists of three macroscopically distinct portions: short, rectilinear and elastic\u2010walled ooesophagus, J\u2010shaped siphon stomach and a long intestine with rectilinear and curved portions, defined by patterns of villi as foregut, midgut, and hindgut. Histological and histochemical differences were observed in the mucosal layers of the different digestive tube regions, such as intense production of neutral and acidic mucous substances in the pseudostratified mucosal epithelium of the oesophagus; positive periodic acid Schiff reagent (PAS)reactions at the apex of the columnar epithelial cells of the stomach and increased intensity of histochemical reactions in the hindgut region. <jats:italic>Neoechinorhynchus<\/jats:italic> sp. was present in 85.7% of specimens examined, with a mean intensity of 7.4\u2009\u00b1\u20096.2 (\u00b1) and abundance of 6.33. Good health of the fish indicated by high relative condition factor values (<jats:sub>\n<jats:italic>Kn<\/jats:italic><\/jats:sub>) and occurrence of only mild to moderate alteration in the mucosal layer indicated that <jats:italic>Neoechinorhynchus<\/jats:italic> sp. exhibits low pathogenicity towards <jats:styled-content style=\"fixed-case\"><jats:italic>P. brachypomus<\/jats:italic><\/jats:styled-content> hosts in farming environments, with low levels of infection.<\/jats:p>","DOI":"10.1111\/jfb.13934","type":"journal-article","created":{"date-parts":[[2019,2,14]],"date-time":"2019-02-14T12:44:34Z","timestamp":1550148274000},"page":"648-659","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["The digestive tube of <scp><i>Piaractus brachypomus<\/i><\/scp>: gross morphology, histology\/histochemistry of the mucosal layer and the effects of parasitism by <i>Neoechinorhynchus<\/i> sp."],"prefix":"10.1111","volume":"94","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8408-8761","authenticated-orcid":false,"given":"Maria I. 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