Destruction of Thyroid Gland of Atlantic Salmon (Salmo Salar L.) by Means of Radio-Iodine. ∗

Conclusion

Salmon parr may be completely thyroidectomized by administration of repeated doses of radio-iodine (I¹³¹). Preliminary observations indicate that the absence of the thyroid gland does not influence the rate of growth of these animals, but reduces the superficial skin pigmentation and may impair the ability to survive a rise in water temperature.