What specie is this koi called

[xenacanth9]

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Here's a butterfly koi I had back in the states, it was probably a "not up to par" cull.

Odd, because it's a nice-looking fish

 

[duanes]

Odd, because it's a nice-looking fish

I got it for just a few bucks at an auction.
A truly notable specimen would run into the thousand$.