Eli5: do fish feel pain?

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If so: how do they handle those parasites that consume their tongues without dying from the pain? They have no appendages, fingers, or other means to remove the parasite so how to they not just succumb from the excruciating pain? (Also, how does that bug parasite thing then survive in their mouth?)

Lots of confusion here!

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The science is a little shaky on what exactly it means to ‘feel pain’ and precisely how sophisticated of a brain it requires, but it’s also important to note that even humans can withstand a tremendous amount of pain without dying. If one of those tongue eating parasites somehow successfully infested a human, it would suck for the human but it wouldn’t kill them.

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