Fig. 5

Progression of dermal lesions in largemouth bass virus-challenged smallmouth bass (Micropterus dolomieu). a Faint skin discoloration on the trunk. b Further progressed skin discoloration. c Skin discoloration accompanied by hemorrhage and early stage of scale loss. d Skin discoloration surrounding a shallow dermal ulcer with hemorrhagic margins and central scale loss. e Deeper ulcer penetrating into the underlying muscular layer with surrounding skin discoloration. f Severe ulceration with well-circumscribed, raised, and hemorrhagic edges