鲨鱼
shā yú · HSK 7
shark
🦈 鲨鱼 = 鲨 (shark) + 鱼 (yú, fish); the 鱼 tag marks it as a fish
The second character 鱼 (yú) means fish and shows up in many sea-creature names, so it flags the whole word as something that swims. The first character 鲨 carries the shark sense, built on that same 鱼 fish radical.
鱼 — pictograph of a fish
鱼 is a pictograph that originally depicted a fish, with the head, body with fins, and tail clearly visible in oracle bone and bronze script. The traditional form 魚 preserves four dots at the bottom representing the tail or fins. The modern simplified form 鱼 replaces those dots with a single horizontal stroke.