Abstract
1.1. The ionic concentrations in the blood and pericardial fluid of intertidal and subtidal species of Modiolus, acclimated to various non-lethal salinities, were examined. Variation in the intracellular free amino acid pools in response to salinity change were also studied.2.2. The ionic concentrations of the body fluids of Modiolus are not regulated. Rather, a Donnan equilibrium seems to exist between the body fluids and the sea water, and between different body fluid compartments.3.3. Free amino acid regulation, identified by a greater decrease in a portion of the intracellular free amino acid pool, with decreasing salinity, than can be accounted for on the basis of changes in amounts of tissue water, occurs in Modiolus.4.4. The amino acid pool is a likely source of solute for the volume regulating response. Further, differences in the pools of the various mussels studied seem to account for the differences in salinity tolerance.
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