Abstract
1. l. Ciliary activity of gill tissue from low and high salinity acclimated Crassostrea virginica, Mercenaria mercenaria, Modiolus demissus and Mytilus edulis was measured at various salinities. 2. 2. For each species there is an initial inhibition of activity at experimental salinities differing appreciably from the acclimation salinity. If the difference between experimental and acclimation salinities is not too great, inhibition is followed by recovery. 3. 3. Recovery time-experimental salinity response surfaces are shifted towards lower salinities for low salinity acclimated Crassostrea, Modiolus and Mytilus (but not Mercenaria) relative to the high salinity acclimated groups. 4. 4. A positive correlation exists between lower salinity boundaries for ciliary activity of isolated gill tissue and whole animal activity. 5. 5. The effects of salinity on ciliary activity and rate of oxygen consumption are compared. At low as compared to high salinities, ciliary activity decreases whereas oxygen consumption increases or remains approximately constant.
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