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Nordgreen said that the behavioural differences they found in response to uncomfortable temperatures showed that fish feel both reflexive and cognitive pain. The experiment shows that fish do not only respond to painful stimuli with reflexes, but change their behavior also after the event, Nordgreen said.
Pain in fish. Whether fish, such as this hooked salmon, can be said to feel pain is controversial. Pain in fish is a contentious issue. Pain is a complex mental state, with a distinct perceptual quality but also associated with suffering, which is an emotional state. Because of this complexity, the presence of pain in an animal, or another human for that matter, cannot be determined unambiguously using observational methods, but the conclusion that animals experience pain is often inferred on the basis of likely presence of phenomenal consciousness which is deduced from comparative brain phys