Abstract
1. 1. Tidal fluctuations of salinity were simulated so that ambient salinity decreased from 30 to 10%. and returned to 30%. over a 12-hr period. 2. 2. Perivisceral fluid osmotic and ionic composition of all three echinoderm species declined to a lesser extent than ambient salinity and returned to control values in Pisaster ochraceus and Cucumaria miniata but did not do so in Strongylocentrotus drobachiensis. 3. 3. Perivisceral fluid osmotic shifts were due predominately to ion flux. 4. 4. The calcium concentration of C. miniata perivisceral fluid was regulated.
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