How long do koi fish live in a pond?
How long do koi fish live in a pond? Koi can live in excess of 100 years, but typically, if well cared for, live 20-30 years. The fish will continue to grow throughout the span of their life, so it is only those older, larger, most beautiful fish that fetch the sums in the thousands. Koi demand a large environment, and this can cost a great deal as well.