We generally offer two rules of thumb regarding the number of koi in a pond. First, average water conditions will allow 1 inch of fish per **10 gallons** of water (or 100 inches for a **1,000**-gallon pond).

Simply so, what is the minimum size for a koi pond?

Well, at three feet deep, a six foot by eight foot pond will yield **1077 gallons**. But these are merely the minimum recommended requirements. Also, the more fish you have, the larger your pond should be. A pond of the aforementioned size will be enough for no more than five average sized Koi.

How long do koi fish live in a pond?

Koi have been reported to achieve ages of 100–200 years. One famous scarlet koi named "Hanako" was owned by several individuals, the last of whom was Komei Koshihara. In July 1974, a study of the growth rings of one of the koi's scales reported that Hanako was **225 years** old.

How many koi can you have in a pond?

Let's do the math using our conservative rule of thumb suggesting **one Koi** for every 250 gallons of well filtered & maintained pond water. A 2500-gallon pond translates to 10 full-grown Koi and you have **30**! Obvious Solution – Get rid of **20 koi** or build a bigger pond.