ELI5: Explain Like I'm 5

Pain in fish

Pain in fish is when a fish feels a hurtful sensation and tries to get away from it. It can feel a sharp or burning sensation, or be more like an ache. For example, when you grab a fish, it will often try and wiggle away because it is feeling pain. Fish also have the ability to remember where the pain is coming from and try to avoid it in the future.