Fig. 2. a in Response of mucous cells of the gills of traíra (Hoplias malabaricus) and jeju (Hoplerythrinus unitaeniatus) (Teleostei: Erythrinidae)

Fig. 2. a. TEM photomicrograph of mucous cell (MC) in the filament epithelium of Hoplias malabaricus. Note pavement cells (PVC) covering MC. b. TEM photomicrograph of mucous cell (MC) in the filament epithelium of Hoplerythrinus unitaeniatus. Note different electrondensity of secretory granules (G). c. SEM photomicrograph of filament epithelium showing mucous granules releasing by MC between PVC cells, at epithelial surface. Scale bar in mm. Arrows indicate mucous granules.