Abstract
1. 1. The fresh-water leech Poecilobdella granulosa survives for prolonged periods in a salinity of 11·65% when adapted gradually. 2. 2. The total osmotic pressure and different inorganic constituents of the body fluid have been estimated in normal leeches and in leeches exposed to different salinities. The leeches are isotonic with the medium when they are in 25% sea water. 3. 3. The leeches show minimal O 2 consumption in 25% sea water and maximal O 2 consumption in 50% sea water. The pattern of metabolic response to salinity appears to be closely related to the osmotic gradient between the body fluid and the medium. The direction of osmotic gradient influences the metabolic response to salinity stress.
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