The histological,surface and internal fine structures of gill filaments of Cromileptes altivelis were investigated using light,scanning and transmission electron microscopy.The results showed that the surface structure and ultrastructure of gill filaments and secondary gill lamellae of C.altivelis were similar to those of other teleosts.Various features such as regular or irregular circular microridges,indentations,micropits and crevices were present.The arrangement of gills were tight,the terminal of gill ...