“Cotton disease” is the collective name for an infection that is characterized by several types of fungi at once (Saprolegnia and Ichthyophonus Hoferi), which are widespread in aquariums. The fungus is often confused…

A widespread disease caused by the bacterium Pseudomonas, which lives in fresh water. Able to live asymptomatically for a long time on the surface of the body of fish and in the intestines.…

Vibriosis is one of the most dangerous and difficult-to-diagnose fatal diseases. Often asymptomatic or similar to other bacterial infections. The disease is common in saltwater or brackish aquariums, but it also occurs in…

Fin rot (also applicable to caudal fin rot) as the name implies, affects the fins and caudal fin, leads to their erosion and, ultimately, may end in the complete disappearance of the fins…

Dropsy (ascites) – the disease got its name from the characteristic swelling of the belly of the fish, as if it were pumped with liquid from the inside. Dropsy is most often caused…

Fish tuberculosis (mycobacteriosis) is caused by the bacterium Mycobacterium piscium. It is transmitted to fish as a result of eating excrement and body parts of dead infected fish. Symptoms: Emaciation (sunk belly), loss…

Mouth fungus (mouth rot or columnariosis) despite the name, the disease is caused not by a fungus, but by bacteria. The name arose because of outwardly similar manifestations with fungal diseases. Bacteria in…

Fish leeches are one of the few species of leeches that choose fish as their host. They belong to annelids, have a clearly segmented body (the same as that of earthworms) and grow…