Abstract
Heart rate and oxygen consumption of the freshwater field crab Oziotelphusa senex senex was measured at different salinities. The minimal rates were observed in the crabs adapted to 50% sea water and increased in both 25% and 75% sea water. The increase in salinity of the media was accompanied by an increase in the blood ionic composition most attributable to changes in Na+ and Cl‐levels. The K+, Ca++ and total ninhydrin positive substance (TNPS) levels followed a gradual increase as the salinity of adaptation increased. The changes in the blood ionic composition due to salinity stress would affect the rate of heart beat of the crab, which was lowest at a salinity (50%) where the ionic gradient between haemolymph and medium was at a minimum.
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