Haemophilus piscium:
A legion of ulcer disease (caused by
Haemophilus piscium) is surrounded by a white to gray rim on necrotized skin and a dark to almost black center made up of tissue debris and blood cells.
Fungus will grow on the necrotized skin, and the diseased is generally found on the gill plate.
a discussion of this topic on another board...
http://www.bassresource.com/bass_fis...m=1245737725/0