Abstract
The fresh water fishes Lebistes. Danio, and Tanichthys distinguish between Sr-90 and Ca-45, when added to the water in which they swim, when the water contains low concentrations of salts. At higher concentrations of NaCl (20-172 n[image]/l), CaCl2 (3.6-14.5 m[image]/l) and SrCl2 (9.6-14.6m[image]/l)bothnuclidesare incorporated by the animals at similar rates and discrimination of Sr-90 relative to Ca-45 is no longer apparent.

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