Accumulation of Strontium and Calcium in Freshwater Fishes of Japan

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Abstract
The 90Sr contents in bones of freshwater fishes (carp and gibel) from radioactive fallouts were investigated in relation to those in the surrounding waters from 1963 to 1970. The specific activities (90Sr/Sr) of fish bones and of the surrounding waters declined rapidly from 1963 to 1964, followed by a gradual decline from 1964 to 1970. The specific activities of fish bones were always slightly higher than those of the waters, except that of gibel in 1963. The time lag between Sr specific activities of fiish bones and those of surrounding waters were 270 days for carp and 360 days for gibel. The discrimination between stable Sr and Ca in freshwater fishes was demonstrated: In the field studies, the Sr-Ca observed ratio (OR) were determined as 0.74±0.05 for carp and 0.84±0.07 for gibel respectively. In rearing experiments, the Sr accumulation of carp reared in the water of 2×10-1 mg Ca/l was twice as much as that in water of 2×102 mg Ca/l. It is now possible to estimate 90Sr content in the bones of carp and gibel by using their OR values and the time lag of Sr specific activity between the freshwater fish bone and the surrounding water.

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