Fig. 1

Transverse sections of fish gill show normal gill architecture control group (A), normal gill architecture with some laceration of gill arches (arrows) and hyperplasia and fusion of primary and secondary gill lamellae (stars) (Nano Se group (B); vitamin E group (C), normal gill architecture with light laceration of gill arches Nano Se + VE group (D) (H&E staining, at ×100 magnification, scale bar 100 μm)