The most fascinating thing about the koi
is that if you keep it in a small fish bowl
it will only grow to be two or three inches long.
Place the koi in a larger tank or small pond
and it will reach six to ten inches.
Put it in a large pond and it may get as long as a foot and a half.
However, when place in a huge lake where it can really stretch out,
it has the potential to reach sizes up to three feet.