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Journal of Experimental Biology 53,101-108 (1970)
Published by Company of Biologists 1970

Hypo-Osmotic Urine in Nereis Diversicolor

RALPH I. SMITH ¹

¹ University of Turku, Archipelago Research Institute, Seili, Nauvo, Finland; Department of Zoology, University of California, Berkeley, California, 94720, U.S.A.

1. Nereis diversicolor, when regulating in water of low salinity, produces urine of lower osmotic concentration than the coelomic fluid.

2. The urine is significantly hypo-osmotic in 0.9-5.3 % sea water (Cl = 5-30 mM/l), and slightly hypo-osmotic in natural Baltic Sea water (17 % sea water; Cl = 95 mM/l).

3. The urine is probably iso-osmotic in 28 % sea water (Cl = 157 mM/l) and higher salinities.