THE METABOLISM OF STRONTIUM-90 AND CALCIUM-45 BY LEBISTES

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Abstract
The rate of uptake of Sr90 and Ca5 by male Lebistes from the water in which they swim is linear with time for the whole body, spine, head, viscera and muscle. The data indicate that fresh water fishes do not discriminate between Ca and Sr. Subtle differences in the metabolism of the two elements by guppies are apparent. Tissues such as the spine, head and viscera accumulate significantly more Sr90 than Ca45 while muscle accumulates more Ca*5 than Sr9O . The rate of turnover of incorporated Sr90 and Ca45 by tissues from Lebistes are strikingly similar but subtle differences are apparent. For both isotopes, the turnover rate in bone is very long (T 1/2 = 600 days) while visceral turnover rate is rapid (T 1/2 Ca = 3 days, T 1/2 Sr = 8 days). The turnover rate of Sr90 in muscle is significantly slower than for Ca45 . The uptake and turnover of the two elements by Lebistes is qualitatively similar with subtle quantitative differences thus indicating a fundamental and essentially similar process.