Effect of ascorbic acid deficiency on the uptake of iodine by thyroid and non‐thyroid tissues of an air‐breathing freshwater fish Channa punctatus Bloch

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Abstract
Using 131I as tracer, iodine uptake by various thyroid and non‐thyroid tissues has been reported in Channa punctatus in which vitamin C deficiency was experimentally induced by feeding vitamin C deficient diet to a level when morphological deficiency syndromes appeared. This was compared with a parallel control, fed a complete diet. The study showed a highly significant decrease in iodine uptake by thyroid tissues in vitamin C deficient fish as compared to the controls. However, the blood and other non‐thyroid tissues recorded a significant increase in absorption and distribution of iodine. These findings suggested hypofunctioning of thyroid gland due to a prolonged deficiency of vitamin C.