Fungus is most common on fish eggs and on an injury site on koi. Various medications that aquarium stores sell can be used to treat fungus on fish quite effectively. Often, fish die not from the fungus but the injury, parasite, or bacteria that created a site for the fungus to invade. Sometimes, the fish could easily recover from a cut except that the fungus invaded.
Fungus is one of the easiest maladies to treat in fish when caught early. It may appear as a patch of fuzz on a fish, or the fish may look like it is covered in threads of fuzz if the case is advanced.
Egg fungus is very common. As a preventative, keeping developing eggs in a dilute (medium blue) methylene blue solution with aeration for a few days (remove before hatching is expected as methylene blue may harm fry) seems to work. Most often, unfertilized or injured eggs are attacked by fungus. If the parent cares for the eggs like many cichlids and the fathead minnow, then the parent in charge will remove these eggs. Otherwise, you must do it.
Methylene blue can aid in the process. Those eggs taking on the blue dye are compromised (infertile or have holes in them) and need to be removed. Without the dye, remove any eggs that are clouded (white) or obviously fungused. Tweezers work well for attached eggs while glass or plastic pipets work well for free (scattered) eggs.
If the fungus gets out of control (when methylene blue is not used), all viable (usually clear with small eyes forming; some species like some cories may have colored eggs) eggs should be removed to a fresh setup with water of similar temperature, pH, etc. Fry should be removed to separate quarters as well because young fry can die from the egg fungus.
Fungus is one of the easiest maladies to treat in fish when caught early. It may appear as a patch of fuzz on a fish, or the fish may look like it is covered in threads of fuzz if the case is advanced.
Egg fungus is very common. As a preventative, keeping developing eggs in a dilute (medium blue) methylene blue solution with aeration for a few days (remove before hatching is expected as methylene blue may harm fry) seems to work. Most often, unfertilized or injured eggs are attacked by fungus. If the parent cares for the eggs like many cichlids and the fathead minnow, then the parent in charge will remove these eggs. Otherwise, you must do it.
Methylene blue can aid in the process. Those eggs taking on the blue dye are compromised (infertile or have holes in them) and need to be removed. Without the dye, remove any eggs that are clouded (white) or obviously fungused. Tweezers work well for attached eggs while glass or plastic pipets work well for free (scattered) eggs.
If the fungus gets out of control (when methylene blue is not used), all viable (usually clear with small eyes forming; some species like some cories may have colored eggs) eggs should be removed to a fresh setup with water of similar temperature, pH, etc. Fry should be removed to separate quarters as well because young fry can die from the egg fungus.
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