Abstract:
:This study describes anatomical, histological and histochemical features of the digestive tract mucosal layer of the matrinxã Brycon amazonicus, an omnivorous freshwater fish endemic from the Amazon basin. 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-shaped 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.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Vidal MR,Ruiz TFR,Dos Santos DD,Gardinal MVB,de Jesus FL,Faccioli CK,Vicentini IBF,Vicentini CAdoi
10.1111/jfb.14217subject
Has Abstractpub_date
2020-01-01 00:00:00pages
251-260issue
1eissn
0022-1112issn
1095-8649journal_volume
96pub_type
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