Topographic Localization of thyroid gland of Prochilodus scrofa Steindachner, 1881 (Osteichthyes Cypriniformes) utilizing the radioiodide 131 I)

Abstract

With the purpose to localize the thyroid gland of Prochilodus scrofa Steindachner, 1881, it was utilized water solution Na¹³¹I, intrastomachial via, in 20 adult and 8 young specimens. The whole body scintillographies showed after 24 hours high proportion of radioiodine in the lower jaw (throat) in all specimen and in the ripe female's ovary too. Histological study showed great amount of thyroid follicles in the conjunctive tissue around the ventral aorta, which once removed cancelled the scintillographic images appearance.