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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.
Some criteria that may indicate the potential of another species, including fishes, to feel pain include: 1  Has a suitable nervous system and sensory receptors. 2  Has opioid receptors and shows reduced responses to noxious stimuli when given analgesics and local anaesthetics. 3  Physiological changes to noxious stimuli.