ABSTRACT
Dealing with the effects of high pressure on osmoregulation should imply the study of the effects of high pressure on the various strategies developed by living species to control their body water in a wide variety of possible environments that they are able to invade. When dealing with salinity, one generally relates the osmolality of the external medium to that of the internal body fluids of multicellular organisms, i.e. blood or hemolymph. The relationship between both parameters is then usually expressed in terms of osmoconformity and osmoregulation. The major problem which animal species face is to maintain, or to restore if disturbed, a cellular volume and a basic pattern of intracellular solutes within some narrow range compatible with the different life-supporting cell activities. This function always results in a steady state situation where the animal’s cells are in chemical disequilibrium with their surrounding medium.
