Do fish drink? Kristie – Doglap, MS
You would think that your koi need a drink of water like the desert needs another grain of sand but just like us; they too need a little refreshment from time to time. Koi utilize water to maintain proper body functions the same as us but they just do it a little bit differently.
Koi don’t per say “drink” like we do. If we want a glass of water, we pour water in a glass and drink away through our mouths. Koi on the other hand absorb water through their gills and body in a process called osmosis. Osmosis is defined by dictionary.com as “the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane.“ In other words, koi have larger concentrations of water that contain salt in their body than does the surrounding water garden. Through osmosis water is constantly passing through koi’s semipermeable skin into their body to equalize these concentrations. Since water is constantly absorbing into their bodies they have to immediately excrete this water to prevent them from bursting. During the course of a day, they can excrete up to 10 times their weight.