Godfrey-Smith, Peter (2016) Pain in parallel. Animal Sentience 3(21)
Brian Key, Why fish do not feel pain
Key's (2016) arguments against the view that fish feel pain can be shown to be fallacious by considering some damage-related behaviors in invertebrates. Pain may have different neural bases in different organisms, so the absence in fish of the cortical structures that might underlie pain in mammals does not settle the question of fish pain.