Branchial sodium exchange in seawater-adapted Tilapia mossambica: effects of prolactin and hypophysectomy.
The effects of exogenous prolactin and hypophysectomy were tested on Na exchange across the gills of Tilapia mossambica adapted to sea-water. Exogenous prolactin produced a 75% decrease of both total Na influx and Na efflux. Total Na influx was measured simultaneously with the drinking rate. Water ingestion stopped almost completely in prolactin-treated fish. Thus branchial net excretion flux of Na was reduced 75% by prolactin. Hypophysectomy produced a 50% inhibition of Na efflux across the gill.
D000222:Adaptation, Physiological; D000818:Animals; D001693:Biological Transport, Active / Q000187:drug effects; D002712:Chlorides / Q000097:blood; D005260:Female; D005399:Fishes / Q000378:metabolism*; D005880:Gills / Q000378:metabolism*; D007016:Hypophysectomy; D008297:Male; D011388:Prolactin / Q000494:pharmacology*; D012623:Seawater; D012964:Sodium / Q000097:blood / Q000378:metabolism*
D002712:Chlorides; D011388:Prolactin; D012964:Sodium