How big can koi get?

 Once again this is determined by the environment the koi are raised in, diet and genetics.  Most koi will break 24" without breaking a sweat inside of 5 years.  Anything over 30" is considered "jumbo" and many Grand Champions have been 36"+.  But many times koi will not even break 20".  Often times koi are kept in smaller ponds with less then ideal water quality and they never get bigger then 14" or 15".  To grow koi large, you need two main things, lots of quality food and really good water.  The problem is these two things often works against each other.  The more you feed them, the lower the water quality gets, which slows the growth of the koi.  But if you feed the koi less, you may have good water quality, but without the nutrients the koi won't grow.  What you really need is BOTH.  Really good water and lots of food.  To achieve this you need great filtration, a large pond and a low stocking density.  This will allow you to feed the koi as much as they will eat without jepordizing water quality.  However to achieve "jumbo" size, you must also have great genetics.    

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