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Journal of Experimental Biology 47,525-534 (1967)
Published by Company of Biologists 1967

Sodium, Chloride and Water Balance of the Intertidal Teleost, Xiphister Atropurpureus : III. The Roles of Simple Diffusion, Exchange Diffusion, Osmosis and Active Transport

DAVID H. EVANS ¹

¹ Department of Biological Sciences, Stanford University, Stanford, California; Department of Biology, University of Lancaster, England

1. The effluxes of ²²Na, ³⁶Cl and tritiated water from the euryhaline teleost, Xiphister atropurpureus were determined in 100 % sea water (480 mM-Na/kg.) and 10 % sea water.

2. Only the flux of sodium in 100% sea water contained an exchange diffusion component. The relative impermeability of Xiphister is shown by its low fluxes of sodium, chloride and water in both salinities.

3. In 10 % sea water the permeability to sodium declined while the permeability to chloride and water remained at sea water levels.

4. In both salinities diffusion and active transport are the major components of the sodium and chloride balance of Xiphister.