Thyroidectomy of the dogfish,<i>Scyllium canicula</i>(L.), and the effect of dogfish thyroid upon the oxygen consumption of rats

Abstract

Summary Surgical thyroidectomy has been successfully performed on the dogfish, Scyllium canicula , and has been shown to have no signficant effect on the animal's oxygen consumption over a period of 6 weeks. The injection of extracts of dogfish thyroid into adult male white rats results in an increase in the animal's oxygen consumption of the same order as that produced by mammalian thyroid preparations. The significance of these results is discussed in the light of recent investigations of thyroid function in fish.