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Changes in Plasma Calcitonin and Calcium During the Migration of Salmon

Department of Medicine (Endocrinology), University of California and Veterans Administration Hospital, La Jolla, California, and Department of Physiology, University of British Columbia Vancouver, Canada

Supported by grants from the National Institute of Health (AM 15888), The American Cancer Society (CI-80), the Veterans Administration, and the Medical Research Council of Canada.

Abstract

The levels of immunoassayable calcitonin and of calcium were measured in the peripheral blood of sockeye salmon during their migration from sea water to fresh water to spawn.Plasma calcitonin was higher in the females than in the males during all stages of migration as was plasma calcium except during spawning. In both sexes calcium decreased progressively throughout migration. In the male, calcitonin decreased as the fish arrived in fresh water but increased again at spawning. In the female, calcitonin levels increased markedly up to the time of spawning, then fell precipitously after spawning. These observations suggest that calcitonin may play an important role in the reproductive cycle of fish. (Endocrinology 96:214, 1975)

Footnotes

¹ Current address: Memorial University of Newfoundland Marine Sciences Research Laboratory, St.John,s, Newfoundland, Canada.

² Clinical Investigator, Veterans Administration. To whom reprint requests should be addressed.

Received June 13, 1974.

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