Stanniectomy Increases Renal Magnesium and Calcium Excretion in Freshwater North American Eels ( Anguilla Rostrata )

The corpuscles of Stannius are linked to the renal transport of magnesium in freshwater North American eels. The urinary magnesium concentration and rate of magnesium excretion increased 3 days after the corpuscles had been removed, a trend which continued throughout a 14 day observation period. The...

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Bibliographic Details
Published inJournal of experimental biology Vol. 181; no. 1; pp. 107 - 118
Main Author Butler, David G.
Format Journal Article
LanguageEnglish
Published Cambridge The Company of Biologists Ltd 01.08.1993
Subjects
Biology
Calcium
Chemical elements
Endocrine system
Excretion
Fish
Kidneys
Magnesium
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ISSN0022-0949
1477-9145
DOI10.1242/jeb.181.1.107

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Summary:The corpuscles of Stannius are linked to the renal transport of magnesium in freshwater North American eels. The urinary magnesium concentration and rate of magnesium excretion increased 3 days after the corpuscles had been removed, a trend which continued throughout a 14 day observation period. There was no overall change in urine flow rates except for a brief 50% reduction 2 days after stanniectomy. Plasma magnesium concentrations drifted downward after stanniectomy. In contrast, plasma calcium concentrations increased significantly within 2 days following stanniectomy and they continued to increase thereafter. Urinary calcium concentrations and the rate of urinary calcium excretion increased 7 days after stanniectomy, implying that the renal response was subject to the increase in plasma calcium concentration: the urine/plasma calcium ratio remained constant. Even though the urinary calcium concentration increased after stanniectomy, the increase in urinary magnesium concentration was proportionally greater.
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ISSN:0022-0949
1477-9145
DOI:10.1242/jeb.181.1.107