I have a Yamabuki Ogon. How can I tell how old he is? -Beka

Unless you were told by the breeder or the dealer, it is almost impossible to guess the age of your Koi. All Koi grow at different rates, most 2-6 inches a year. Over a few year period, some Koi will be a lot bigger than others. Koi have growth rings in their scales, not unlike the rings in tree trunks. These rings can be counted with a microscope, although this method is sometimes inaccurate. Share: Del.icio.us Digg Reddit