How big do koi grow?

 Koi carp can grow to 120cm in length, although any fish over 100cm is considered huge. Most koi don’t grow much over 60cm in length in average garden ponds and a number of factors affect growth including genetics, water temperature, food, space and water quality.

If a fish didn’t have large parents and isn’t fed the best food, in year-round warm water, in a large pond, it may never grow to record size. Lots of people think their koi are large (Ghost koi grow big and quickly,) but if you go to a koi show and see a 90cm or even a 100cm Jumbo, you’ll be amazed at just how big that is.   

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