THE METABOLISM OF RADIONUCLIDES BY MARINE ORGANISMS. I. THE UPTAKE, ACCUMULATION, AND LOSS OF STRONTIUM89BY FISHES

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Abstract
Pelagic fishes excrete Sr89 rapidly; the 1-2% remaining after 1 day persisted at the same level for the next 26 days. Sr89 is rapidly eliminated from the visceral organs, but bones, gills, integument and muscle maintain their Sr89 level. Dark muscle and bones, more vascularized than light muscle and cartilage, retain less Sr89 Tilapia mossambica, a sluggish fish, excretes Sr89 more slowly than do pelagic fishes and the % of dose retained is slightly higher, but the internal distribution is about the same. Tilapia injected with Sr89 retained 60-70% of the dose during 14 days. Muscle was 3 times more radioactive than muscle of fish receiving the Sr89 orally. Tilapia can concentrate Sr89 directly from sea water, but the ratio of counts/min /g fish to cpm/min/g sea water at 21 days was only 0.3.

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