Transient changes of the intestinal absorption of sodium and chloride in the rainbow trout after abrupt transfer into sea-water |
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Authors: | G Nonnotte A Aubree-Pelletier D A Colin |
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Affiliation: | Laboratoire de Neurobiologie et Physiologie comparées, CNRS (UA 1126), Arcachon, France. |
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Abstract: | 1. Unidirectional fluxes of Na+ and Cl-, ouabain-sensitive Na+,K+-ATPase activity and the protein content have been determined in the intestine of trout in fresh water (FW) and 1, 2, 7 days after sea-water (SW) transfer. 2. After abrupt transfer in SW the Na+ and Cl- transports follow in two phases: first, a permeabilization of the epithelium during the first day; secondly, a transient impermeabilization and increase of the protein content of the mucosa (2 days after SW transfer) and a progressive increase of both the unidirectional Na+, Cl- fluxes and the Na+,K+-ATPase activity (7 days after SW transfer). 3. After 7 days SW the adaptation of the enterocytes which is different for Na+ and Cl- and for the middle and the posterior intestine is not achieved. |
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