Abstract
1. 1. The effects of salinity (0, 7, 14, 21, 28 and 35‰) on haemolymph osmotic, Ca 2+, K + and Na + regulation in Macrobrachium carcinus were investigated. 2. 2. M. carcinus is a strong hyperosmotic regulator in fresh or low salinities (0–21‰), while at high salinities (28–35‰) it is a hypoconformer. 3. 3. Na + haemolymph concentrations stayed fairly constant in salinities from 0 to 14‰ and increased slightly with the increase in the external sodium ion concentration. 4. 4. K + haemolymph concentrations increased slightly from 0 to 21‰ and sharply in salinities beyond this range. 5. 5. Ca + haemolymph concentrations were hyperionic to those of the media in all salinities. 6. 6. These results are compared with those of the Malaysian prawn, M. rosenbergii.
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