How do underwater prey know a predator is hunting them?

Question

How do underwater prey know a predator is hunting them?

In: 25

Answer 1

Same as you: they see, hear, and smell predators.

Fish, for example, have a sensitive organ called a “lateral line” that in some ways is like an ear (they have ears too) that runs the length of the fish, and it can use it to detect movement in the water. If they sense something coming towards them, they move away and sometimes look back.