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Journal of Experimental Biology 83,181-192 (1979)
Published by Company of Biologists 1979

Ionic Regulation in Rainbow Trout (Salmo Gairdneri) Adapted to Fresh Water and Dilute Sea Water

F. B. EDDY 1 and R. N. BATH 1

1 Department of Biological Sciences, University of Dundee, Dundee DD1 4HN

Small rainbow trout (5–20 g) adapt to salinities of up to at least 22{per thousand} but not to full strength sea water. In adapted fish plasma ions are regulated nearthe fresh water values, but there is an ionic invasion of the tissues, particularly by Cl- in muscle cells. Analysis of ionic regulation in adapted fish indicates that balance is maintained mainly by expending energy on Cl- regulation. Fish in full strength sea water can no longer regulate Na+ or Cl- in plasma or tissues, which results in high tissue concentrations of these ions and eventual death.

Submitted on January 4, 1979






© The Company of Biologists Ltd 1979