My koi pond is a pond of multi colored fish
Wow,  how does it look like? 
Very colorful, several varieties are recognized by the Japanese 
OK.  Have never heard of koi pond before,  tell me more about it
main colors are white, black, red, yellow blue
That looks colourful.  So do they separate the fishes in their colours
not usually, Its a natural mutation, so there would be no need
OK,  now I get it
they are a cold water fish and can adapt and survive almost anywhere.