Goldfish Info

All good goldfish keepers take the time to learn about their pets. Knowing more about goldfish helps us to take better care of them.

Why not start by learning the 12 mistakes most new goldfish-keepers make?

You can also explore diseases, like swim bladder disease, and learn how to prevent them.

Plus, do you know the difference between goldfish and koi? Where goldfish come from? And whether or not they have tongues?!

Our Goldfish Facts & Info articles are where you can learn all of this and much more about your goldfish.

Congested fins in goldfish

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congested fins

The condition known as congested fins is easy to confuse with fin rot, and can be particularly hard to correctly identify in fish who have red fins.

Congested fins lead to the tail and fins taking on a torn and ragged appearance, without any external trauma having occurred to cause the tearing.

While any of the fins or the tail of the fish can be affected with the condition, it is most commonly seen in the caudal fin before progressing to other areas of the body if left unchecked.

In serious or protracted cases of the condition, the fins will begin to split vertically, and are highly likely to fall prey to a secondary attack via fungal infection.

In advanced cases of congested fins, the Cyclochaeta parasite may also be present, but it is not thought that parasitic infection causes congested fins to occur in the first place.

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Common goldfish myths

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Cartoon of a goldfish squeezed into a small bowl

Goldfish are some of the most widely studied and understood of all of the popular pet fish species. However, there are still a huge number of myths and misconceptions about them.

For instance, do goldfish really only have a memory span of a few seconds? This is one of the most commonly stated goldfish “facts,” and one that is totally inaccurate!

Read on to learn more about some of the most common myths and misconceptions that surround keeping goldfish, plus the truth behind them.

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Goldfish are smarter than you think!

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Cartoon of a goldfish dressed as a professor

The goldfish is one of the most popular of all the fish kept as pets. They are a group of freshwater fish belonging to the Family Cyprinidae, Order Cypriniformes, and one of the earliest species of fish to be domesticated.

The myth that goldfish have a very short attention span has been making the rounds in the web and even among aquarists. However, research studies have shown that this is not correct. In fact, goldfish have been shown to have a memory that can last at least three months.

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Goldfish and Costia

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goldfish and costia

Of all of the parasitic infections that can affect goldfish, Costia is one of the hardest to identify. It can only be seen under a microscope and – even then – can be hard to spot.

But despite its small size, Costia can have a serious effect on goldfish if left untreated.

If you are worried that your goldfish may be suffering from this infection, or you want to know the warning signs to look out for, read on to learn more.

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Goldfish and leeches

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Cartoon of a goldfish with leeches

Leeches are not among the most common of goldfish parasites, but nevertheless, they are rather nasty, and easily introduced into an existing tank.

Leeches live by latching onto a living host (such as a goldfish) and feasting on the blood of the host, before detaching and dropping away when they are full, and then repeating the process every time that they are hungry.

Understandably, leeches can pose a health hazard to goldfish, both through blood loss and through the risk of infection to the abrasions left behind after they detach from the skin.

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The Difference between Koi and Goldfish: Are Goldfish Carp?

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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.

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