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Journal of Experimental Biology 53,317-327 (1970)
Published by Company of Biologists 1970

The Effects of Prolactin and Divalent Ions on the Permeability to Water of Fundulus Kansae

W. T. W. POTTS ¹ and W. R. FLEMING ²

¹ Department of Zoology, University of Missouri, Columbia, Missouri, U.S.A.; Department of Biological Sciences, University of Lancaster, England
² Department of Zoology, University of Missouri Columbia, Missouri, U.S.A.

1. Measurements have been made of the rate of exchange of tritiated water in both intact and hypophysectomized Fundulus kansae in a variety of media.

2. Hypophysectomy reduces the rate of exchange in fresh water.

3. Low doses (30 mu) of ovine prolactin stimulate water turnover in hypophysectomized fish in fresh water.

4. The rate of exchange declines in both intact and hypophysectomized animals with increasing salinity.

5. Experiments with synthetic solutions show that the decline in the rate of exchange in sea water and in higher salinities is due mainly to the effects of calcium ions.

6. Fishes maintained in synthetic sea water containing a low concentration of calcium have both a higher rate of exchange of tritiated water and a higher drinking rate than fish in normal sea water.