Figure 4: Scanning electron microscopy of the anterior portion of intestine. A: Scanning electron micrograph of the anterior intestine of grass carp showing long mucosal folds (mf). B: Scanning electron micrograph showing the surface polyhedral shaped enterocytes (e) and goblet cells (gc). C: Scanning electron micrograph of the surface polyhedral shaped enterocytes (e) of anterior intestine of grass carp, covered with microvilli. Notice the presence of large pores leading to goblet cells (gc). D: Scanning electron micrograph of the damaged surface of anterior intestine of grass carp, covered with microvilli (mv). Notice presence of typical goblet cells (arrow).