The striated and polished surfaces are called slicken-sides.

有痕的磨光面擦痕面。

Most fishes have unstriated rays along the anterior part of the dorsal and ventral edges (leading edges) of the caudal fin.

大多数鱼类的尾，沿著侧与腹侧缘的前部具有无痕的。一些鱼中，例如鰕虎鱼其有痕的与无纹的软数量比鑑定上是有帮助的。