The renal handling of calcium and renal Ca2+(Mg2+)-activated adenosinetriphosphatase activity in freshwater- and seawater-acclimated North American eels (Anguilla rostrata LeSueur)

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Abstract
In fresh water a small fraction of the calcium filtered across the glomerular apparatus is recovered whereas in seawater the clearance rate of calcium greatly exceeds that of inulin. This indicates a lower translocation of calcium by the renal tubules in fresh water when compared with that in seawater. This increased translocation of calcium in the seawater-acclimated eels was associated with an increase in the activity of renal Ca2+(Mg2+)-ATPase and a decrease in the apparent affinity of the enzyme for calcium. The enzyme was equally stimulated by calcium and magnesium and this may be associated with the fact that in seawater the eel faces a similar problem with regard to each of these ions.

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