How long do Koi live?

 This can vary greatly depending on the environment the koi are raised in, their diet and of course genetics.   In most good quality backyard koi ponds, the koi can live upwards of 20 years, maybe even 30.  In truly spetacular koi ponds with high end filtration and larger amounts of water, some hobbyists have gotten over 40 years from their koi.  However this is nothing compared to koi that spend their life in mud ponds and lakes.  The Japanese have koi that are well over 70 years old, but these never spend much time in small cement or liner tanks.  They are in large mud lined ponds fed by a natural spring.  There are stories of koi living over 250 years.  As far as I know, these are just rumors.

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