Treatment of the Saprolegnia infection is accomplished by medicating the water with potassium permanganate, after removing skin pathogens. While increased salt levels, combined with good electrolyte and calcium levels in the water, are good treatment options for an Ichthyophonus hoferi infection, another possible measure is raising the water temperature to 82 degrees Fahrenheit (consult a veterinarian first), as the Ichthyophonus fungi are more virulent in colder waters.
It is important to thoroughly clean and sanitize the fish tank, aquarium, or fishpond for either of these injections.
Removing dead infected fish, sanitizing the environment, and not feeding your pets raw fish are all good ways to prevent either of these fungal infections.
Having the strength to cause disease; deadly in nature; pathogenic