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Are Koi and goldfish related?

Best Answers

In A Nutshell. Two species of carp are often kept in ponds and larger home aquariums. Both are Asian in origin and appear superficially similar. Goldfish are actually descended from crucian carp, while the koi have barbels, grow longer, and are in fact a fancy domesticated version of the common carp. read more

They are related and sometimes used for interbreeding. The best example of this is taking the koi and breeding it to the long fin goldfish to generate butterfly koi. Most fish limit their fin length growth but some fish developed the ability to allow this growth to continue. read more

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Koi