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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.
Sneddon published a study proposing that fish -- specifically rainbow trout -- can detect and feel pain. Previous research on whether fish feel pain focused solely on cartilaginous species like sharks. For the first time, Sneddon's work documented potential pain sensations in teleostic (bony) fish.