Fig. 3

Photomicrograph of skin tissue sections from O. niloticus of PT + S group (A magnified in B (A, selected square)) showed vacuolar degeneration in epidermal cell layers with more or less goblet cell distributed (red arrowheads), mild sub epidermal pigmentation (black arrows) and mild edematous vacuoles in the dermis (stars). H&E stain. The bar size was indicated under pictures