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Biol Bull 83: 363-366. (December 1942)
© 1942 Marine Biological Laboratory
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A NOTE ON THE FREEZING-POINTS OF THE URINES OF TWO FRESH-WATER FISHES: THE CATFISH (AMEIURUS NEBULOSUS) AND THE SUCKER (CATOSTOMUS COMMERSONII)

CHARLOTTE HAYWOOD 1 and MARY JEANNE CLAPP 1

1 From the Department of Physiology, Mount Holyoke College, South Hadley, Massachusetts

1. Freezing-point determinations on the urines of five catfish, Ameiurus nebulosus, collected in winter and in May, ranged from -.019° C. to -.035° C., with an average of -.025° C.

2. Similar determinations on the urines of eight suckers, Catostomus commersonii, showed a range from -.046° C. to -.181° C., with an average of -.094° C.

3. The rate of urine flow was considerably higher in the catfish than in the sucker.

4. The possibility of seasonal variations in urine flow is suggested.






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