Scientists say fish feel pain. It could lead to major changes in the fishing industry. - The Washington Post

PDF) There's more to Fish than Just Food: Exploring the Diverse Ways that Fish Contribute to Human Society

There is ample evidence that fish feel pain, Letters

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Fish experience pain in the same way as humans

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Pescetarianism - Wikipedia

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Scientists say fish feel pain. It could lead to major changes in the fishing industry. - The Washington Post