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The role of the renin-angiotensin system as an aldosterone stimulating factor in the mammal is well-established (1, 2). A high salt intake diminishes the demand to conserve sodium in the body, and the secretion of aldosterone is decreased by the control of renin-angiotensin system. Decreased renin activity on a high salt diet has been shown in the mammal (3-5). In 1942, Friedman, Kaplan, and Williams found the absence of renin in the kidney of marine fish, but detected it in the fresh water fish (6). If this be true, renin-angiotensin would play a role in salt adaptation of the fish. We kept Japanese eels in both fresh and sea water for 3 to 11 weeks, and determined the renin content of the kidney, to see if euryhalinity is controlled by renin in eels. We found a decrease in renin of those kept in sea water, and suggested that the renin-angiotensin system plays a part in salt adaptation (7). The purpose of this paper is to give details of these studies on Japanese eels and other euryhaline fishes adapted to sea water.

ROLE OF RENIN IN ADAPTATION TO SEA WATER IN EURYHALINE FISHES