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Koi reach approximately 10 times the size (mass, not length) of goldfish.  The standard recommendation for pet koi is at least 250 gallons per koi with a minimum pond size of 1000 gallons.  In other words a 1000 gallon pond is adequate for 1-4 koi provided you have adequate filtration and water changes.  People who keep fine koi for breeding or showing typically use 1000-2000 gallons per fish.

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In general, no.

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Oh wow, okay glad I asked. They get massive. They are just such beautiful fish. Wish I could keep them, may be I will get a pond one day.

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Holy, those suckers are huge, how old do you think some of them big boys are?

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It's hard to tell. Koi do their best and fastest growing in the first 2-3 years of life, a lot like goldfish, but they still grow their whole lives.

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Giant show Koi are often less than 5 years old. Their color begins to fade as they age. A 10 year old koi is nearly full grown.

Edited by DieselPlower

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Amazing

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In general, no.

DP short and to the point :thumbs::teehee

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