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Comparative analysis of the small and large intestines of Acará Geophagus brasiliensis (Quoy & Gaimard, 1824) (Pisces: Cichlidae).

  • Chaves, Ana Paula Gorle de Miranda1
  • Oliveira, Maurício Gustavo1
  • Paschoalini, Alessandro Loureiro1
  • Bazzoli, Nilo1
  • Santos, José Enemir Dos1, 2
  • 1 Programa de Pós-Graduação em Biologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, Brazil. , (Brazil)
  • 2 PET Biologia - Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, Brazil. , (Brazil)
Published Article
Anatomia Histologia Embryologia
Wiley (Blackwell Publishing)
Publication Date
Nov 18, 2021
DOI: 10.1111/ahe.12763
PMID: 34792205


Geophagus brasiliensis, popularly known as acará, is a common fish in lentic freshwater environments in South America. This species has a detritivorous-iliophagous 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 acará. 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 hours 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-Schiff (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. © 2021 Wiley-VCH GmbH.

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