Abstract
1. 1. All experiments were performed on whole animal or isolated preparations of the American oyster, Crassostrea virginica. 2. 2. Whole preparations showed a linear decline in the transport of particles when the salinities were changed. Dissected preparations exhibited a transport rate which declined more precipitously. 3. 3. The dissected preparation demonstrated a decrease in serotonin and DOPA decarboxylase activities. This was further exacerbated in the presence of PTZ (an intracellular calcium releasor) and salyrgan (a calcium-pump inactivator) perfusates. 4. 4. These experiments support the hypothesis that the effect of salinity change on transport of particles is in fact an effect of the change in calcium ion concentration.
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