Have you ever wondered whether goldfish and koi are the same type of fish? And whether they could breed with each other?
Do you struggle to tell koi and goldfish apart?
While they are related, the two types of fish are actually different species, with many differences between them.
Read on to learn more about these differences. We’ll start by looking at the different origins of the two types of fish, then look at their physical differences. Finally, we’ll find out whether koi and goldfish can breed with each other.
Takeaways:
- Koi vs Goldfish: While both are types of carp, koi and goldfish belong to different species and genera. Koi are a subspecies of the common carp, while goldfish are from a different genus.
- Origins: Koi were first bred in Japan in the 1820s, while goldfish originated in China over a thousand years ago. Both were selectively bred for attractive colors and patterns.
- Taxonomy: Koi belong to the genus Cyprinus, while goldfish belong to Carassius. This separation happened millions of years ago.
- Physical Differences: Koi are larger, have barbels near their mouths, and have an attached dorsal fin. Goldfish are smaller, have varied body shapes, and a split caudal fin.
- Breeding: Goldfish and koi can breed with each other, but the resulting offspring are sterile, meaning they can’t reproduce.
- Living Together: Koi and goldfish can live together, but koi tend to outcompete goldfish for food and space due to their size and strength.
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