TROUT treated with morphine have added to evidence that fish feel pain. The drugged fish showed less visible distress than undrugged ones when their lips were injected with an acid, suggesting the morphine is deadening pain.
“This study has shown that the criteria for animal pain have been fulfilled,” says Lynne Sneddon of the University of Liverpool, UK, in Applied Animal Behaviour Science (vol 83, p 153). Sneddon has already shown that fish injected with the acid behave erratically, but critics said this might be a reflex action rather than a response to pain (Â鶹´«Ã½, 3 May, p…
