Abstract
The involvement of corpuscles of Stannius (CS) of the freshwater fish Notopterus notopterus, in serum calcium level changes has been investigated. The changes in the serum calcium level and histology of CS cells have been studied based on exposing fish to calcium concentration and CS extract administration. The results indicate that on exposure to calcium rich water for 15 days, the serum calcium increases and after 15 days the level decreases. The CS extract injected to fish exposed to calcium rich water also exhibited initial increase of serum calcium and gradually decreases upto 15 days, The CS cells under distilled water exposure are not active. The CS cells exhibit small nucleus and intense eosinophilic cytoplasm without any vascularisation indicating that the contents are not released in the CS cells. In calcium chloride injected fish, the CS cells exhibits active condition characterised by vesicular nucleus in the majority of cells with cytoplasmic degranulation suggesting that calcium is a factor for stimulation of CS for its secretion in regulating serum calcium level in the freshwater fish, Notopterus notopterus. The changes in the histology of CS cells were also noticed in the above experimental conditions.
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