Aquarium tropical fish and fish diseases


Fungal roe disease

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Fungal roe disease

Latin name: Saprolegnia, Achlya
Other names:
Pathogen: fungus
Symptoms: Thin white thread on the ROE

White threads will appear on the roe perpendicular to its surface.

Mold fungi Saprolegnia and Achlya often cause roes death in hatchery pond.
White threads will appear on the roe perpendicular to its surface. These are fungal hyphae. Primarily they will infest unfertilized roe which is not rich in nutrients (yolk). They will then spread to fertilized roe, deprive it of oxygen and thus cause its death. Aquarists will often fail to breed fish. Spawning fish spawn well, laying eggs in the gravel, plants, leaves or special spawning sites, but within 24 hours eggs will get covered with white hyphae of Saprolegnia or Achlya. This is caused by the wrong hydrochemical regime created in the hatchery pond. Special hydrochemical regime, temperature, lightening of the spawning site as well as water level necessary for a particular fish species are essential for proper incubation of fish eggs.

Water hardness, pH, the level of dissolved oxygen are very important considerations. Aquarists will often overdo in dimming the light in the spawning sites, they do not perform water aeration while the oxygen level in a rearing acquarium is important. This causes an oxygen deficit. As a result roe die and become infested by fungi. Recommendations about the creation of proper hydrochemical and thermal regimes, lightening of spawning sites of different fish species are described in manuals for aquarists.

How to cure:

Sera mycopur
Sera ectopur

Water should be disinfected and unfertilized eggs are removed. Great care must be taken to provide them with the proper hydrochmical and thermal regimes, light, water necessary for a particular fish species are very important considerations.

Fish susceptible to the disease/disorder: