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Histological changes in the gill of the common carp (Cyprinus carpio) exposed to Ag-NPs for 96 h. (a) Control. Mc: mucous cell, Gf: gill filament, Gl: gill lamella, Sc: secretion cell. AB-PAS (pH 2.5) reaction. (b) 50 μg/L. Bifurcation of the filament. H&E stain. (c) 100 μg/L. Increase in mucous cells. AB-PAS (pH 2.5) reaction. (d) 200 μg/L. Hyperplasia of the lamellar epithelium (★). H&E stain.
