The Journal of General Physiology
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The Journal of General Physiology, Vol 64, 148-165, Copyright © by The Rockefeller University Press

ARTICLE

On the Mechanism of Sodium Extrusion across the Irrigated Gill of Sea Water-Adapted Rainbow Trout (Salmo gairdneri)

Leonard B. Kirschner 1, Lewis Greenwald 1, and Martin Sanders 1

1 From the Department of Zoology, Washington State University, Pullman, Washington 99163.

Dr. Greenwald's present address is the Department of Zoology, Ohio State University, Columbus, Ohio 43210.

Sodium efflux (JoutNa) across the irrigated trout gill was rapid in sea water (SW), but only about 25 % as large in fresh water (FW). The difference correlated with a change in the potential difference across the gill (TEP). The latter was about +10 mV (blood positive) in SW, but –40 mV in FW. Both flux and electrical data indicated that gills in this fish are permeable to a variety of cations including Na+, K+, Mg2+, choline, and Tris. They are less permeable to anions; PNa:PK:PCl was estimated to be 1:10:0.3, and PCl > Pgluconate. The TEP was shown to be a diffusion potential determined by these permeabilities and the extant ionic gradients in SW, FW as well as in other media. JoutNa appeared to be diffusive in all of the experiments undertaken. Exchange diffusion need not be posited, and the question of whether there is an active component remains open.

Submitted on November 1, 1973


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