CONCENTRATION OF RADIOACTIVE IODINE BY THE THYROID GLAND OF THE PARROT FISH, SPARISOMA SP

Abstract
When I131 was jnjd. into the peritoneal cavity of the Bermuda "mudbelly," Sparisoma, its thyroid gland concentrated the iodine enough to produce an autograph of the gland when dried and applied to an X-ray film. A non-thyroid tissue, the auricle, does not. The gill tissues also produce an autograph, but a weaker one than that of the thyroid, suggesting that in this fish some thyroid follicles are scattered in the gill region, a fact well established for many teleosts.