Darth Sorcerer
Aquarium Advice Apprentice
Koi / Goldfish = Carp
The Best example I can give you on the difference between a Goldfish and a Koi (Nishikigoi) when breeding has occurred producing a Sygnus(Hybrid) is this. When you breed a Horse with a Donkey you get a Mule (Hybrid) which is unable to reproduce. A better example on the subject of fish is when you cross a Brook Trout with a Lake Trout, you will end up with a Splake, another Hybrid which is unable to reproduce. All because these creatures are similar, they are all different species.
========================================Well see, I told you I didn't know much about Koi specifically LOL. Both the goldfish and the Koi are members of the carp family, the goldfish being inbred for color from a different member of the carp family than the Koi. Given that the Koi are actually river carp I'm still not sure that moving them indoors in the winter is all that viable of an option.
The Best example I can give you on the difference between a Goldfish and a Koi (Nishikigoi) when breeding has occurred producing a Sygnus(Hybrid) is this. When you breed a Horse with a Donkey you get a Mule (Hybrid) which is unable to reproduce. A better example on the subject of fish is when you cross a Brook Trout with a Lake Trout, you will end up with a Splake, another Hybrid which is unable to reproduce. All because these creatures are similar, they are all different species.