Diseases Archives | The Goldfish Tank

Goldfish Parasites: Causes and Treatment

2022-09-292022-07-21 by Lewis German

Much like us mammals, who can be host to ticks, fleas, lice, leeches and many other nasty parasites, fish also have a range of species which live and feed on them as parasites. In the wild, fish will always come into contact with parasites, however, in the wild environment, it isn’t as much of a … Read more

Goldfish fungus: Types of fungus, causes and treatments

2023-01-172022-02-22 by Sara Jane Hales

Fungus grows on fish due to less than ideal conditions in the water and is the most commonly seen disorder in fish. It is seen as cotton-like growths on the gills, mouth, and face. Fungal infections tend to appear because the fish has broken skin or a primary disease such as a parasite or bacteria. … Read more

Is Your Goldfish Turning Black? 4 Reasons Why & What You Should Do

2021-11-052021-11-01 by Adam Jones

An orange goldfish with black ammonia burn patches resting on gravel at the bottom of a fish tank

Goldfish turning black can be a sign of serious problems. Find out why goldfish turn black & what you should do now if your goldfish is going black.

Why is my goldfish sitting at the bottom of the tank?

2022-07-202021-02-13 by Sara Jane Hales

A goldfish sitting at the bottom of a tank

Goldfish shouldn’t spend long periods sitting at the bottom of their tank. If they are, it may be the sign of a problem.

Congested fins in goldfish

2023-01-172014-09-02 by Adam Jones

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.

Goldfish and Costia

2023-01-172014-07-06 by Adam Jones

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.

Goldfish and leeches

2021-11-042014-06-18 by Adam Jones

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.