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This species has a detritivorous\u2010iliophagous or omnivorous feeding habit, with high food plasticity; however, there are no studies describing its intestinal tract histologically. Therefore, the present study analysed through histological and histochemical techniques the intestines of the acar\u00e1. Adult specimens were collected with gillnets, anaesthetized and euthanized. Then, the fish were submitted to biometry and dissection to remove fragments of intestines. The samples were fixed in Bouin liquid for 12\u00a0hours and subjected to histological and histochemical techniques. Histologically, all samples of intestines were organized into four layers: mucosa, submucosa, muscular and serosa. The small intestine (foregut and midgut) was characterized by the presence of intestinal villi covered by simple prismatic epithelium with a striated border and goblet cells supported by the connective lamina propria. In the large intestine (hindgut), there was an absence of villi and an abundance of goblet cells. Positive reaction to Periodic Acid\u2013Schiff (PAS) and Alcian Blue (AB) pH 2.5 reactions were detected in goblet cells, indicating the presence of mucosubstances. No lipids were detected in the intestine cells due to the negative reaction to the Sudan Black B. The results of the present study provide subsidies for a better understanding of the intestinal morphology of teleosts and provide valuable information for phylogenetic studies.<\/jats:p>","DOI":"10.1111\/ahe.12763","type":"journal-article","created":{"date-parts":[[2021,11,18]],"date-time":"2021-11-18T11:43:53Z","timestamp":1637235833000},"page":"79-84","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Comparative analysis of the small and large intestines of Acar\u00e1 <i>Geophagus brasiliensis<\/i> (Quoy &amp; Gaimard, 1824) (Pisces:\u00a0Cichlidae)"],"prefix":"10.1111","volume":"51","author":[{"given":"Ana Paula Gorle de Miranda","family":"Chaves","sequence":"first","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Biologia de Vertebrados Pontif\u00edcia Universidade Cat\u00f3lica de Minas Gerais  Belo Horizonte Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maur\u00edcio Gustavo","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Biologia de Vertebrados Pontif\u00edcia Universidade Cat\u00f3lica de Minas Gerais  Belo Horizonte Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1059-0062","authenticated-orcid":false,"given":"Alessandro Loureiro","family":"Paschoalini","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Biologia de Vertebrados Pontif\u00edcia Universidade Cat\u00f3lica de Minas Gerais  Belo Horizonte Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1562-4927","authenticated-orcid":false,"given":"Nilo","family":"Bazzoli","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Biologia de Vertebrados Pontif\u00edcia Universidade Cat\u00f3lica de Minas Gerais  Belo Horizonte Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5238-2173","authenticated-orcid":false,"given":"Jos\u00e9 Enemir dos","family":"Santos","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Biologia de Vertebrados Pontif\u00edcia Universidade Cat\u00f3lica de Minas Gerais  Belo Horizonte Brazil"},{"name":"PET Biologia \u2010 Pontif\u00edcia Universidade Cat\u00f3lica de Minas Gerais  Belo Horizonte Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,11,18]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.4025\/actascibiolsci.v26i1.1657"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1095-8649.2001.tb02261.x"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1242\/jcs.s3-90.10.109"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2109.2008.02079.x"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/azo.12156"},{"key":"e_1_2_9_7_1","first-page":"161","article-title":"Adaptaciones del aparato digestivo al regimes alimenticios en algunos peces del Rio Uruguay y del Rio de La Plata","volume":"1","author":"Angelescu V.","year":"1949","journal-title":"Revista Del Instituto Nacional De Ciencias Naturales"},{"issue":"2","key":"e_1_2_9_8_1","first-page":"213","article-title":"Avalia\u00e7\u00e3o do com\u00e9rcio de peixes ornamentais de \u00e1gua doce em Aracaju, Sergipe","volume":"26","author":"Assis D. 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