Most Common Diseases in Betta Fish

The Betta, also known as Siamese fighting fish, are small fish and with a lot of personality that many people want to have due to their beautiful and vibrant colors.

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If the aquarium they are in is kept in the best conditions, clean and fresh, the Betta can live longer and be happier. However, if space is not suitable for healthy living, Betta often develop parasitic, fungal or bacterial diseases.

If you have a beautiful Betta fish at home and would like to know more about this species, keep reading this article from YourCatCareguide in which we will show you the most common diseases in Betta fish .

It may also interest you: The creation of Betta fish

Know a little more about your Betta fish

Most of the diseases that Betta fish suffer can be prevented only with a good and clean environment and treated with antibiotics and aquarium salt. Try to get to know your fish from the first day you take it home. Observe your behavior when you are in good condition, so if you become ill and the physical symptoms do not appear, you can identify if something is not right , as your behavior will certainly change.

A good time to do this is while cleaning the aquarium and when you are feeding it. If your fish is sick you will not want to eat as much or you will not want to do it at all.

Fungus in the mouth

The fungus in the mouth is a bacterium that, by itself, grows in aquariums and lakes. It is a bacterium that can be both beneficial and harmful. When a Betta suffers from this disease, physically, it begins to present “cotton or gauze” spots on the gills, mouth and fins throughout the body.

This problem is caused when the conditions of the animal’s habitat are not appropriate or stressful (overcrowding or low space) and little new and clean water circulation.


It is not considered a disease as such, but rather a manifestation of the internal or degenerative poor state of fish present by other conditions such as swelling and accumulation of fluid in the liver and kidney.

It can be caused by parasites, viruses, malnutrition and bacteria . The hydrops is severe and visible because the abdominal area is clearly inflamed and some parts of the body with bristling scales.

Other symptoms are poor appetite and constant need to rise to the surface to receive oxygen. It is a disease that could be contagious to other members of the aquarium, but in most cases it is not.


This is undoubtedly one of the most common diseases of Betta fish, with hundreds of cases reporting its onset. Its long fins are susceptible to poor and poor water quality, although it seems that the Betta bites its own tail out of boredom or stress. Besides the drastic change in the state of the tail, which can be clearly torn, the animal may present weakness, strange white spots, black and red edges along the affected area.

Do not worry because with a treatment, based almost on changing the water daily and checking the source of it, the tail of your Betta will grow again. Do not let the symptoms progress because the rot could eat other skin tissues and go from being a treatable problem to a deadly disease.

ICH or white dot disease

Quite common, caused by the presence of a parasite that needs the body of the Betta to stay alive. Your symptoms begin by changing the behavior of the animal. Your will be very erased, sometimes nervous and will rub your body to the walls of the aquarium. Then the white dotsappear all over the body. These spots are just cysts that surround the parasites.

If the disease is not treated, the fish can die of suffocation, because with such anxiety, the heart rhythm is changed. Salt water baths, medicines and even thermotherapy are some of the treatments used.


Septicemia is a non-contagious disease caused by bacteria and derived from stress caused by factors such as overcrowding, sudden changes in water temperature, the arrival of new fish in the aquarium, poor condition of the food or by wounds of any kind. It is diagnosed by the presence of red blood marks all over Betta’s body.

The most typical treatments for this disease are the placement of antibiotics in the water, which are then absorbed by the fish. Antibiotics should be used sparingly. It is best to ask the veterinarian before applying them, so that you can recommend the most appropriate dose.

This article is purely informative, in we do not have the capacity to prescribe veterinary treatments nor to make any type of diagnosis. We suggest you bring your pet to the veterinarian in case of any type of condition or malaise.

If you want to read more articles the less common you may be in Betta fish , we recommend you to enter our section on Other health problems .

    Emily Harris

    Hi Guys, Girls, and Cats:-pI am Emily Harris, and you can see in above pic. She loves me I swear. I saved her from a dumpster a few weeks back.

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