Pond Boss Forums INTRO Questions & Observations Diseased Fish?

Like Ken mentioned, most infections that you see on the fish are secondary- meaning that a wound, stress, etc gave the disease organism a chance to work it's nasty magic. If you are seeing a white, fuzzy area that resembles cotton on the fish, you are almost certainly seeing a fungus (probably a fungus called Saprolegnia). This fungus takes advantage of physical injuries that a fish has incurred from some other source. Your pond's healthy fish should be fine because this fungus is always in your pond.....it just thrives on sick, stressed, injured, diseased fish. If you were running a hatchery then you would want to begin treatment, but I wouldn't be overly concerned with the rest of the fish in your pond.