Koi have barbels on their bottom lips (whisker-like projections) and goldfish do not
There is no difference. Koi are pool fish. They were developed by the Japanese to have broad colourfull backs so they look good when seen from above.
They are bigger.
koi fish would normally eat goldfish food try tetra fin goldfish flakes they are made for goldfish and koi
I think it's KOI I have a friend who's is a really big koi lover. He is very adamant about the fact that koi are not goldfish!
Koi is a type of fish. Just don't put koi in the pond and it will not be a koi pond.
If the Koi is large enough it may well eat a goldfish fry but Goldfish and Koi are not fighting type fish so they do not normally bite one another.
Goldfish do not have hair; instead, they have scales that cover their bodies which can vary in type and colour depending on which type of goldfish you have.
No they are not goldfish
The Chinese developed the goldfish. Koi were developed in Japan. So the answer is no.
Yes they can cross breed.
goldfish, koi
Koi
The oldest living goldfish in the world are Koi (singletail) most likely due to the fact that they are (normally) housed in large ponds. Although there are many fancy goldfish that live a long time, Koi surpass them in longevity.
Yes pond comets and other pond goldfish get along with koi, however koi can get over 24 inches long when a comet typically doesn't grow more than 12 inches- that's quite a considerable difference in size (which is why its often best to keep koi with other koi and goldfish with other goldfish).