Enterocytes in the anterior intestine of Oncorhynchus mykiss: Cytological characteristics related to osmoregulation

In an ultrastructural study of the pyloric ceca region of the anterior segment of the intestine of rainbow trout, we observed enterocytes with features suggestive of a role in osmoregulation. Earlier studies of the anterior portion of the intestine in fresh-water teleosts have considered this region...

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Bibliographic Details
Published in:Aquaculture 1996, Vol.139 (1), p.109-116
Main Authors: Abaurrea-Equisoaín, M.A., Ostos-Garrido, M.V.
Format: Article
Language:English
Subjects:
ABSORCION DIGESTIVA
ABSORPTION DIGESTIVE
ACIDE AMINE
AMINO ACIDS
AMINOACIDOS
Anatomy & physiology
Biochemistry
CITOLOGIA
CORPS GRAS
CYTOLOGIE
CYTOLOGY
DIGESTIVE ABSORPTION
Enterocytes
FATS
Fish
GRASAS
INTESTIN
Intestine
INTESTINES
INTESTINOS
ONCORHYNCHUS MYKISS
OSMOREGULACION
OSMOREGULATION
Rainbow trout
ULTRAESTRUCTURA
ULTRASTRUCTURE
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Summary:In an ultrastructural study of the pyloric ceca region of the anterior segment of the intestine of rainbow trout, we observed enterocytes with features suggestive of a role in osmoregulation. Earlier studies of the anterior portion of the intestine in fresh-water teleosts have considered this region as the site of amino acid and fat absorption. Lipoprotein synthesis is believed to take place in the enterocytes of this segment, and subsequently be released into the blood stream. At the level of the openings of the pyloric ceca, two morphological types of enterocytes could be identified on the basis of the electron density of the cytoplasm. Both light and dark enterocytes displayed ultrastructural features similar to those of cells for which physiological and ultrastructural studies have documented an osmoregulatory function, such as columnar epithelial cells in the esophagus and anterior portion of the intestine in marine and euryhaline teleosts.
ISSN:0044-8486
1873-5622
DOI:10.1016/0044-8486(95)01147-1