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Action of Thyrocalcitonin in the Teleost Fish Ictalurus melas

Abstract

HORMONAL control of calcium homoeostasis in the lower vertebrates has received relatively little attention. This is particularly true for teleost fish in which there is a definite osseous skeleton but no parathyroid glands. Understanding of control of calcium homoeostasis in these animals therefore is a problem of considerable evolutionary and physiological interest. The demonstration of a potent hypocalcaemic factor in the thyroid tissue of certain mammals1 has now provided a new approach, because teleost fish possess definite thyroid follicles in spite of their diffuse occurrence. We have examined the effects of a porcine thyrocalcitonin extract on concentrations of serum calcium and phosphate in the catfish and tried to demonstrate the presence of thyrocalcitonin in catfish tissue which contained thyroid follicles.

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LOUW, G., SUTTON, W. & KENNY, A. Action of Thyrocalcitonin in the Teleost Fish Ictalurus melas. Nature 215, 888–889 (1967). https://doi.org/10.1038/215888a0

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