Saturday, August 15, 2009

Osmoregulatory System

What is a Koi's "osmoregulatory system"? - Anna

It regulates the amount of water that's in a Koi. It involves the kidneys, the gills and the anus. When a Koi has too much water in its system, after it's absorbed through the gills, the kidneys expel some of it.

If a Koi gets sick enough for the kidneys to fail, it loses its ability to expel excess water, so it gets a condition called dropsy.



When a Koi gets dropsy, it will swell up, sometimes so much that the scales "pine cone" outwards.

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