Seasonal changes in the extrathyroidal distribution of iodide in the teleost fish the burbot,Lota lotaL.

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Abstract
The distribution of radioactivity in tissues of adult burbot weighing 1 to 3 kg was determined by measuring the T/S ratio (tissue radioactivity/serum radioactivity) at intervals after the injection of radioiodide. In one instance the skin which comprises 12% of body weight of the burbot showed a T/S ratio of 29.3 and accounted for up to 27% of the injected dose of radioiodide. By comparison, in another study, the thyroid showed a T/S ratio of 5.2, representing 2.2% of the injected dose at 9.5C. The radioactivity (T/S ratio) in the skin increased until 30 h after injection and then declined.Non-radioactive iodide values of skin and serum were determined on a natural population over the course of a year. Values for skin iodide ranged from 227 μg/100 g to 816 μg/100 g while serum iodide values ranged from 7 μg/100 ml to 30 μg/100 ml. These values also indicate the magnitude of seasonal variation, which, in the case of serum iodide concentration, parallels the seasonal changes in lake temperature.