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Am J Physiol Regul Integr Comp Physiol 248: R157-R160, 1985;
0363-6119/85 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 248, Issue 2 157-R160, Copyright © 1985 by American Physiological Society

ARTICLES

Endogenous renin-angiotensin system and drinking behavior in flounder

R. J. Balment and S. Carrick

High rates of drinking in seawater-adapted, compared with freshwater (FW)-adapted, flounder were associated with raised plasma chloride and osmotic concentrations. Hypotension in FW-adapted fish, after papaverine administration, gave rise to greatly elevated rates of drinking. This dipsogenic response apparently relied on activation of the endogenous renin-angiotensin system (RAS) and was abolished by simultaneous administration of the converting enzyme inhibitor, captopril. Exogenous angiotensin II was shown to be dipsogenic and vasopressor in the FW-adapted fish. The physiological importance of the activation of the RAS in the control of drinking behavior in euryhaline fish is discussed.




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