Long-Term Effects of Hypophysectomy on the Growth and Calcification of Otoliths and Scales in the Goldfish,Carassius auratus : Endocrinology

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概要

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• Goldfish (Carassius auratus) were given tetracycline for time-marking, followed by hypophysectomy. They were kept at 0.25% NaCl-tap water for 32 weeks and then sacrificed to examine long-term effects of hypophysectomy on the accretive growth and calcification of otoliths and scales. Plasma was also analysed for calcium and sodium concentrations. Hypophysectomy resulted in cessation of somatic growth in length. Hypercalcemia and hyponatremia were induced by hypophysectomy. Tetracycline-induced bands indicated that scale growth almost ceased after operation, while otoliths continued to grow at a rate reduced to approximately half. The marginal osteoid of scales was poorly developed in hypophysectomized fish. X-ray energy spectra revealed no difference in elemental constituens of the newly formed regions of these tissues between the experimental and control groups: major elements were phosphorus and/or calcium, suggesting that these regions are fully calcified. These results were discussed with the allometric growth of otoliths to somatic growth.

• 社団法人日本動物学会の論文
• 1990-04-15

著者

• Mugiya Yasuo

  Department Of Biology And Aquaculture Faculty Of Fisheries Hokkaido University

関連論文

• Long-Term Effects of Hypophysectomy on the Growth and Calcification of Otoliths and Scales in the Goldfish,Carassius auratus : Endocrinology
• Effects of Hypophysectomy and Replacement Therapy with Bovine Growth Hormone and Triiodothyronine on the in Vitro Uptake of Calcium and Methionine by Scales in the Goldfish, Carassius auratus
• Effects of Ovine Prolactin, Bovine Growth Hormone and Triiodothyronine on the Calcification of Otoliths and Scales in the Hypophysectomized Goldfish Carassius auratus

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