Physiology of Finfish and Shellfish (2+1)

5.2.17. Function of corpuscles of stannius

The endocrine function of corpuscles of stannius is still doubtful. However, corpuscles of stannius perform following functions.

1. Presence of renin activity: Extracts of corpuscles of stannius corpuscles of the eel increase blood pressure in which resembled to that evoked by renin. ( Renin is a protein (enzyme) released into the bloodstream by special kidney cells. It is released in response to decreasing salt (sodium) levels or low blood volume. Renin plays a role in the release of aldosterone, a hormone that helps control the body's salt and water balance).
2. Osmoregulatory function: Removal of the corpuscles of stannius from the eel caused a reduction in the plasma sodium and increase in the potassium and calcium concentration which may even result in death. So corpuscles of stannius have an effect on osmoregulation.
3. Effect on kidney function: The kidney is the major organ upon which the secretions of the corpuscles of stannius show maximum activity. Removal of corpuscles of stannius did not affect the sodium transporting system in the gills of either freshwater or seawater eels but marked changes in renal function as evident from decline in the urinary calcium and magnesium excretion.