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    Home»Food & Health News»Experiments reveal that crabs and lobsters feel pain

    Experiments reveal that crabs and lobsters feel pain

    August 7, 20132 Mins Read
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    320px-SteamedLobster

    by Daniel Cressey

    Every year thousands of them are boiled or torn apart while they are still alive, and now there is strong evidence to suggest that crustaceans experience pain.

    That was the stark message delivered by Robert Elwood, an animal behaviour researcher at Queen’s University Belfast, to the Behaviour 2013 meeting in Newcastle, UK, today.

    Crustaceans — crabs, prawns, lobsters and other creatures — are generally not protected by animal-welfare laws, despite huge numbers of them being caught or farmed for human consumption. The exclusion has been based on the belief that these animals cannot experience pain — generally regarded as an ‘unpleasant feeling’ — and instead only have nociception, a reflex response to move away from a noxious stimulus.

    This is a useful belief, as crustaceans are subjected to what Elwood calls “extreme procedures” — lobsters in factories having their legs removed while they are still alive, crabs being kept alive but tightly bound for days in fish markets, and live prawns being impaled on sticks for eating. Such procedures, he notes, “would never be allowed with vertebrates”.

    One way Elwood attempted to determine whether crustaceans can experience pain was to look at avoidance learning: can the animals actually learn from pain, or do they just continue to respond to a stimulus? To answer this, Elwood and his colleague Barry Magee presented shore crabs with a choice of two different shelters. Entering one shelter resulted in an electric shock for the animal, which was repeated if the animal remained there. The other shelter was a safe haven.

    Crabs shocked the second time the experiment was run were far more likely to choose the other shelter in the next trial, while crabs never left a non-shocking shelter. This, says Elwood, shows that the shock is aversive.

    In another experiment Elwood investigated whether hermit crabs could make motivational trade-offs as a result of pain. They presented Pagurus bernhardus crabs with two types of shell, one of which the animals are known to prefer, and gave some of the animals small electric shocks when they were inside these new homes.

    Read More Here

    Crabs Experiments Feel Lobsters Pain Reveal
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