THYROIDAL CONTROL OF RADIOPHOSPHORUS METABOLISM IN YEARLING SALMON, SALMO SALAR L.

• Published in: Canadian Journal of Zoology
• Main Author: Srivastava, P. N.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1960
• Subjects: Animal Science and Zoology; Ecology, Evolution, Behavior and Systematics; Salmo salar
• Online Access: http://dx.doi.org/10.1139/z60-031; http://www.nrcresearchpress.com/doi/pdf/10.1139/z60-031

In one experiment yearling Salmo salar L. treated with 0.3% thiourea for a fortnight absorbed 50.3% of P 32 from the water whereas in control they could utilize only 40.1%. The uptake in various tissues (bone, liver, kidney, and muscles) was always more in treated fishes than in control. In a second experiment the utilization of radiophosphorus was minimum (39%) in control, more (52%) in thiourea-injected fishes, and maximum (63%) in thyroxine-injected ones. The turnover time of P 32 was slower in control than the treated fishes. It is suggested that in the thiourea-treated fishes stimulation of the thyroid is indirect (by thyrotropin secreted by the pituitary gland) whereas in the thyroxine-injected fishes the stimulation is direct and so the P 32 utilization is maximum. Thus the thyroid stimulates mineral metabolism.