shark
鱶 centers on the shark, a large predatory fish. The meaning is specific and concrete, with no broad abstract extensions.
鱶 combines 魚 (fish) with 養, which likely contributes the sound. The character was created to represent a shark, a specific kind of fish.
The fish radical 魚 on the left tells you it's a fish, and the right side 養 (nourish) hints at a creature that nourishes itself by hunting. Together they point to a shark.
For ショウ, imagine a shark's fin cutting through the water during a dramatic show: show -> ショウ, and the shark is the star of the show.