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Histological changes in the skin of the common carp (Cyprinus carpio) exposed to Ag-NPs for 96 h. (a) Control. (b) 50 μg/L. Increase in mucous cells shown by staining with Alcian blue. (c) 100 μg/L. Increase in club cells. (d) 200 μg/L. Vacuolation of the epithelium (★). Cc: club cell, Mc: mucous cell, Pc: pigment cell, S: scale. AB-PAS (pH 2.5) reaction.
