DEPENDENCE OF CONVERSION RATIO ON THE DOSE OF RADIOIODINE IN FISH

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Abstract
Goldfish at 20 °C showed a correlation between the 4-day conversion ratio (CR) and dose of I131 over a dose range of 1.1 to 8.2 μc/gram body mass. Other aspects of I131 metabolism did not correlate with dose. Chum salmon at 12 °C also showed a correlation between CR and dose over a comparable range but goldfish (4 °C), chub (4° and 20 °C), steelhead trout (4 °C), and sockeye salmon (4 °C) showed no dependence of CR on I131 dose. Goldfish were unique amongst these species in possessing ruptured follicles and blood cells in the colloid. Ruptured follicles were also present in uninjected fish and there was no evidence to relate rupturing of follicles with dose-dependence of the CR.