What is the difference between a common goldfish and a koi? A quick guide to tell them apart

Common goldfish and koi look very similar. Many beginner fish keepers cannot tell them apart clearly. So where is the difference between common goldfish and koi? Can they be kept together?

Differences between common goldfish and koi

1. Both all-gold common goldfish and koi exist. But golden common goldfish sold outside are more common; koi are mostly red and white, and the red is usually deep red.

2. One has barbels and the other does not; common goldfish have no barbels.

3. A fish with a white body and a red head is a koi; of course, if it has a fleshy growth on its head, whether red or not, it is a goldfish.

4. Koi have a plump, round body shape; common goldfish are flatter by comparison.

Can common goldfish and koi be kept together?

As for whether koi and common goldfish can be kept together, we need to look at it from two sides. Why do we say that? It is true that some fish keepers keep common goldfish and koi together and can also raise them all very well, but most fish keepers simply cannot reach that level.

1. Put the koi into the tank first, and add common goldfish after they are in good condition

2. When keeping them together, be sure to provide enough food

3. Selecting common goldfish requires skill

4. Do not let the size difference be too large