Can a stock tank be used as a Koi pond?

I have a plastic stock tank that I recently purchased. Is it possible to use it as a Koi pond? I think it is about 300 gallons.

Stock tanks are too small to house Koi indefinitely. If you were to put a few Koi in a stock tank, they will outgrow it in a few years. Most Koi end up being 18 to 24 inches long and need a decent body of water to live in. A Koi pond should have around 200 to 300 gallons of water per fish. For instance, if you had 7 Koi, then your pond volume should be between 1,400 and 2,100 gallons.

Stock tanks do have their use in the hobby. They make great hospital/quarantine tanks. Their small size makes it easy to administer parasite treatments if your fish is sick. Visually inspecting a new Koi is also easier when they are confined to a small area.

If your Koi are modest in size, a stock tank can be used to house them during the winter. Koi can live in a limited space for a few months.