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Average cencentration of ions in body fluids (mM/litre)

Na+ K+ Ca+ Mg+ Cl-
Marine invertebrates 370-550 7-24 8-21 6-58 430-590
Terrestrial invertebrates 3-262 1-46 2-47 6-188 15-270
Reptiles and birds (plasma) 130-180 3-6 2-6 1-2 103-148
Mammals (plasma) 145-166 3-6 2-10 1-2 100-116
Taken from Pethig pg. 107

Reference: C.L. Prosser, in Comparative Animal Physiology, p. 79. C.L. Prosser (Ed.), W. B, Saunders Ca., Philadelphia (1973).