One of the oldest pictographs in continuous use — the oracle-bone form showed a fish in profile with head, body markings, fin, and tail. The simplified eight-stroke form keeps that anatomy: the upper hook is the head, the central
田-like grid is the scaled body, the bottom horizontal is the tail.
鱼 is its own Kangxi radical (#195) and anchors
鲁,
鲜,
鲸,
鲨.
