are a type of koi, carp or goldfish.

In this article, we look at the origins of both koi carp and goldfish and compare the two species.
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Yes, there is a difference. In a water garden the focus is generally on the plants and the overall appearance in the landscape while often keeping a few goldfish as well. With a koi pond the focus is on the koi and proper accommodations should be made. We will now detail each a little more thoroughly.
Read on to find out more about the differences and similarities between koi carp and goldfish.
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Goldfish and koi are the products of selective breeding. The many varieties that grace our aquariums and are the result of genetic manipulation. Thus, the controlled breeding you are interested in is natural and appropriate for this particular type of fish. Can Koi and other types of pond goldfish eat the same food?
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Photo provided by FlickrKoi, Butterfly Koi, Goldfish and more. We have it all. And food to feed it!
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All the above aside, people do successfully keep them together. Those that do, usually come to the conclusion that they need separate ponds. And catching all the goldfish is nearly impossible. There are many, many people that kick themselves in the butt for introducing goldfish to "age" a pond prior to introducing koi: once you got 'em, ya GOT 'em (kinda like cockroaches, only much prettier ;) )Two species of carp are often kept in ponds and larger home aquariums. Both are Asian in origin and appear superficially similar. Goldfish are actually descended from crucian carp, while the koi have barbels, grow longer, and are in fact a fancy domesticated version of the common carp. Although more widely known in the wild, the koi fancy is more “elite” than the goldfish scene, with millions of dollars being invested in the finest fish.The only way to be sure is to NOT have the ponds connect! Friends did that very such thing and they were inundated in the lower pond with growing goldies, cause some just always manage to survive the koi! They finally got rid of all but one goldfish cause they can't seem to catch it! They now have a nice pretty upper pond with no fish in it that feeds to the lower pond.The koi carp and the goldfish are actually fish from the same species family, and while there are of course significant differences between them, they also have a lot of similarities. But this won’t stop larger fish from trying to eat smaller ones!So, if you’re wondering whether koi eat other fish and if it’s safe to keep goldfish and koi carp together, this article will answer all of your questions…If you notice that your goldfish are not surviving alongside your koi or seem to be disappearing from the pond – and if your goldfish are small enough to fit in the koi’s mouth – then it may be that your koi are eating them. However, there are other possible explanations for your goldfish disappearing…