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This species presents short thick oesophagus with longitudinal folds, that allow the passage of large food items. The mucosa is lined with a stratified secretory epithelium rich in goblet cells that secrete neutral and acid mucins. The two mucin types provide different viscosity in anterior and posterior oesophagus related to the protective and lubricant functions, respectively. The stomach is a highly distensible Y\u2010shaped saccular organ. Here, it is proposed that this anatomical shape plays an essential role in food storage when food availability is abundant. The stomach mucosa is composed of epithelial cells with intense neutral mucin secretion to protects against gastric juice. The intestine is slightly coiled and presents internally a complex pattern of transversal folds that increases the absorption surface and the retention time of food. Goblet cells in the intestine secrete acid and neutral mucins that lubricate the epithelium and aid in the digestive processes. In the rectum, an increase in goblet cells population occurs that may be related to better lubrication.<\/jats:p>","DOI":"10.1111\/jfb.14217","type":"journal-article","created":{"date-parts":[[2019,11,25]],"date-time":"2019-11-25T02:00:18Z","timestamp":1574647218000},"page":"251-260","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Morphological and histochemical characterisation of the mucosa of the digestive tract in matrinx\u00e3 <scp><i>Brycon amazonicus<\/i><\/scp> (Teleostei: Characiformes)"],"prefix":"10.1111","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1532-5452","authenticated-orcid":false,"given":"Mateus R.","family":"Vidal","sequence":"first","affiliation":[{"name":"School of Sciences, Department of Biological Sciences S\u00e3o Paulo State University (Unesp)  S\u00e3o Paulo Brazil"},{"name":"Institute of Biosciences, Department of Morphology S\u00e3o Paulo State University (Unesp)  Botucatu Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0544-8325","authenticated-orcid":false,"given":"Thalles F. 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