In the control gills, clear morphology
showing hyaline cartilaginous rods in each of the filaments with
clear primary lamellae and secondary lamellae were seen. Single large
sized squamous epithelial cells and muscle cells lay scattered on both
ides of the lamellae as seen in Fig. 3a. Infected gills showed complete destruction
of lamellae which was also reported in our previous study
(Thanigaivel et al., 2014)