Fungal disease (mycosis): A Quick Guide

fungal disease

False Neon disease in tetra fish is caused by bacteria. Below is a quick overview of the fish disease.

What is Fungal disease (mycosis)?

A fungal disease ( mycosis ) or fungal infection always occurs as a secondary infection . Fungal diseases are also called “fish mold” or “water mold”.

A fungal disease is therefore a secondary disease of already physically damaged fish, healthy fish are not attacked by fungi.

In fish, mushrooms of the genus ” Saprolegnia ” are widespread. These mushrooms are characterized by wad-like growths on the skin of the fish.

The water mold Saprolegnia tolerates a water temperature range of 3 to 33 ° C, but prefers lower temperatures.

Almost every (sick) fish can be attacked by a fungal disease . In the aquarium fish can also be affected by a fungal infection:

  • armored and callous catfish (Callichthyidae)
  • aerial catfish (Pimelodidae)
  • toothfish (Cyprinodontiformes)
  • cichlids (Cichlidae)
  • carp fish (Cyprinidae)
  • puffer fish (Tetraodontidae)
  • wild fish such as pike (Esocidae)
  • salmon fish (Salmonidae)
  • white fish (Leuciscidae)
How to treat fungal disease (mycosis) in an aquarium

Fungal disease (mycosis) Infestation

These fungi normally feed on dead organic material (fish droppings, leftover food, plants, spawn) in the aquarium.

The reproduction takes place through spores that float freely in the water and look for food sources or “victims”.

Healthy fish are not attacked by these fungi as they cannot adhere to the mucous membrane. If this mucous membrane is injured, however, the fungi can penetrate these areas.

Two-dimensional fungal infections occur very often after a gas bubble disease , from which the scaly pockets of the fish (scales erected, similar to a pine cone) were affected.

Fungal disease (mycosis) causes

The causes of a fungal infestation can be varied: the most common is damage to the mucous membrane by sharp-edged objects, bite wounds or touching the fish with dry hands, inappropriate housing, and injuries from parasites or bacterial infections.

Fungal disease (mycosis) Symptoms

External symptoms:

  • At the beginning of the course of the disease, a whitish, cotton ball-like coating appears, which consists of individual fungal threads
  • this coating turns greenish to brownish in color as the disease progresses
  • the fins can stick together or fall off completely (thereby restricted swimming behavior)
  • In the last stage of the disease, the fungus penetrates the body of the fish and attacks the internal organs and muscles, the nervous system is damaged by toxic metabolic products and the fish die
fungal disease
Fungal disease

Fungal disease (mycosis) prevention

  • always pay attention to correct water values
  • Remove sharp objects from the pool (gravel, decoration)
  • Quickly remove food residues and dead organic material from the tank
  • species-appropriate fish stocking (avoid biting)
  • Handle fish only with wet hands
  • avoid unnecessary stress for the fish
  • use a UV lamp with sufficient power, as this also kills mold spores
  • Remove fish from the aquarium that have become sick due to excessive fungal infestation
  • create optimal water values
  • Remove plant residues and leaves from the pond
  • aerate the aquarium well
  • Remove parasites that “gnaw” the mucous membranes of the fish from the pond
  • carry out the fish stocking correctly
  • Strengthen the defenses of the fish with fish mineral and thus make them more resistant to diseases (especially before winter , as the fungal spores can multiply better at low temperatures)

Fungal disease (mycosis) treatment

In the early stages, you should change the water frequently and raise the water temperature. By using leaves of the sea almond tree ( Terminalia catappa ) or using (iodine-free) salt baths, you can get a grip on mild fungal infections.

Even at an advanced stage, a fungal disease can still be effectively treated with medication ( e.g. HS Aqua Fungicell , Sera mycopur or Fungol ). In this case, however, you should first seek the advice of a qualified veterinarian.

Many fungal medicines contain ingredients such as copper sulfate or copper hlocrid . These substances are deadly for invertebrates and catfish (Siluriformes), even in small doses. Medicines containing malachite green are very successful for aquarium fish (forbidden for food fish, including their spawning).

Fungl disease (mycosis) treatment

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