Transient changes of the intestinal absorption of sodium and chloride in the rainbow trout after abrupt transfer into sea-water.
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.
D000064:Acclimatization; D000818:Animals; D001692:Biological Transport; D001693:Biological Transport, Active; D002712:Chlorides / Q000378:metabolism*; D004848:Epithelium / Q000378:metabolism; D005618:Fresh Water; D066298:In Vitro Techniques; D007408:Intestinal Absorption; D007413:Intestinal Mucosa / Q000378:metabolism; D007700:Kinetics; D012487:Salmonidae / Q000378:metabolism*; D012623:Seawater; D012964:Sodium / Q000378:metabolism*; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D014337:Trout / Q000378:metabolism*
D002712:Chlorides; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase