Fig. 12. TEM showing the chloride cell ultrastructure of the filamental epithelium from tilapia exposed to 85 g l^–1 (A,B) and 95 g l^–1 (C–G) salinity for 120 h. (A) Perinuclear cytoplasm of a mature chloride cell. (B) Chloride cell at the early stage of degradation by apoptosis. (C) Nucleus and perinuclear cytoplasm of a mature chloride cell. (D) Multicellular complex with a shallow apical pit, formed by a mature cell at the early stage of apoptosis and accessory cell projections. (E) Apoptotic chloride cell. (F) Degenerated chloride cells with condensed cytoplasm, pycnotic nuclei, and distended and ruptured mitochondria. (G) Chloride cells degrading by necrosis. Scale bars: 1 µm.