Biology and Behavior

The Difference between Koi and Goldfish: Are Goldfish Carp?

by
Are Goldfish Carp

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.

Read more

Decoding goldfish behavior

by
Cartoon of two goldfish chasing each other

If you keep pet goldfish, you have almost certainly spent many hours watching them go about their daily lives, interacting with their surroundings and each other, and doing all of the normal things that goldfish do!

But have you ever watched your goldfish swimming around and wondered exactly why they are doing what they are doing, or what their behavior means? Many of us have!

Goldfish are generally thought of as being fairly simple creatures, and the different behaviors that they exhibit are not difficult to interpret, if you know what you are looking for. Read on to learn about how to decode some of the most common pet goldfish behaviors.

Read more

Why do goldfish change color?

by
Cartoon of a multi-colored goldfish

Have you looked at your goldfish recently and thought that it looked a different color? Have you compared old photos of your goldfish to now and noticed that your fish’s color used to be brighter? You may even have noticed your goldfish gradually turning white! Don’t worry, you’re not going crazy! It’s actually perfectly normal for … Read more