Fig. 2

Photomicrograph of skin tissue sections from O. niloticus of PT-S group (A magnified in B (A, selected square)) showed marked thinning epidermal thickness with few scattered goblet (mucous) cells (blue arrowheads), excessive sub epidermal black pigmentation (black arrows) and large edematous vacuoles in the dermis layer (stars). H&E stain. The bar size was indicated under pictures