Sodium, chloride and water balance of the intertidal teleost, Xiphister atropurpureus. I. Regulation of plasma concentration and body water content.

Studies of the sodium, chloride and water balance of Xiphister atropurpureus (Evans, 1967 a-c) showed that this intertidal teleost is relatively impermeable to these ions and to water, has an exchange-diffusion system for sodium only, and apparently lowers its permeability to sodium but not to chloride or water when acclimated to a lower salinity. An investigation of the intertidal teleost, Pholis gunnellus, was undertaken to determine whether the sodium, chloride and water balance of this species exhibit the same characteristics and to explore further the problem of the sodium, chloride and water balance of teleosts in general.