Recent investigations indicate that some species of Crustacea have the ability to alter their apparent permeability to water in order to reduce the osmotic stress placed on the animal (Smith, 1967, 1970, 1976; Bolt, 1982; Lockwood, Bolt & Dawson, 1982). The apparent permeability to water of the amphipod Gammarus duebeni (Lilljeborg) varies dramatically when the animal is subjected to varying, salinity regimes (Lockwood, Inman & Courtenay 1973; Dawson, 1982; Bolt, 1982).

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