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Fig. 8. Ultrastructure of filament epithelial cells viewed by transmission electron microscopy (TEM) in carp exposed to hypoxia (0.3 mg O₂ l^–1) for 4 h (A,B) and 8 h (C–F). In A, note the cytoplasm of the -mitochondria-rich cell (MRC) containing swollen mitochondria, irregular meshes of tubular reticulum (TR) and high concentrations of ribosomes (R). In B note the apical area of the -MRC with short microvilli, formation of microvesicles (arrows), and the concentration of numerous microvesicles under the apical membrane. In C, note neighboring MRC and mucous cell (MC) and abundant microvesicles spreading from apical to perinuclear area of the MRC. In D, note MRC on the bottom of the cavity formed by flanks of the pavement cells (PVCs). In E, note the MRC with small flattened apical surface and high concentration of microvesicles under the apical membrane. In F, note the cytoplasm of the `shallow-basin' -MRC. In B,D,E arrows indicates site of microvesicle (MV) formation. RER, rough endoplasmic reticulum; M, mitochondrion. Scale bars, (A) 0.5 µm; (B,D,E) 2 µm; (C,F) 1 µm.

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