I have apond in my back yard and I put some Koi in it. That's just a group of colored variants of the Amur carp. It's nice. 
Koi fish are beautiful, where did you get them?
A local pet place. I like how the varieites are differintiated by coloration, pattern and scalation,
Oh I see, what kind of patterns and colors do they normally have?
Some majors ones are white, black ,red, yellow , blue and cream. 
Ooo, I'd love to see a black koi fish. Where do they originate from?
Not sure. But Carp are originally found in Central Europe and Asia.
Ah yes that's what I was asking. I was thinking they were asian, but I had no idea they also came from euorope
Various carp species were domesticated in East Asia I believe and were used as mostly food fish.