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TEM micrographs of the gill apparatus in D. rerio after 96 h of exposure to 38.5 µg/L of HgCl2: (A) degeneration in primary epithelium with degeneration of mucous cells (asterisk), epithelial gaps (arrow), and macrophage infiltrations (star); (B) folding of secondary lamellae, hypertrophic mucous cell (asterisk), and tissue hyperplasia; (C) appearance of CCs in secondary lamellae and formation of deep invagination in CC (star). All bars 2 µm.
