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Research: Crabs Not Only Suffer Pain But Remember It As Well; 'Not A Simple Reflex'
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BELFAST, Ireland -- New research published by a Queen's University Belfast academic has shown that crabs not only suffer pain but that they retain a memory of it.

The study, which looked at the reactions of hermit crabs to small electric shocks, was carried out by Professor Bob Elwood and Mirjam Appel from the School of Biological Sciences at Queen's and has been published in the journal Animal Behaviour.

Professor Elwood, who previously carried out a study showing that prawns endure pain, said his research highlighted the need to investigate how crustaceans used in food industries are treated.

Hermit crabs have no shell of their own so inhabit other structures, usually empty mollusc shells.

Wires were attached to shells to deliver the small shocks to the abdomen of the some of the crabs within the shells.

The only crabs to get out of their shells were those which had received shocks, indicating that the experience is unpleasant for them. This shows that central neuronal processing occurs rather than the response merely being a reflex.

Hermit crabs are known to prefer some species of shells more strongly than others and it was found that that they were more likely to come out of the shells they least preferred.

The main aim of the experiment, however, was to deliver a shock just under the threshold that causes crabs to move out of the shell, to see what happened when a new shell was then offered.

Crabs that had been shocked but had remained in their shell appeared to remember the experience of the shock because they quickly moved towards the new shell, investigated it briefly and were more likely to change to the new shell compared to those that had not been shocked.

Professor Elwood said: "There has been a long debate about whether crustaceans including crabs, prawns and lobsters feel pain.

"We know from previous research that they can detect harmful stimuli and withdraw from the source of the stimuli but that could be a simple reflex without the inner 'feeling' of unpleasantness that we associate with pain.

"This research demonstrates that it is not a simple reflex but that crabs trade-off their need for a quality shell with the need to avoid the harmful stimulus.

"Such trade-offs are seen in vertebrates in which the response to pain is controlled with respect to other requirements.

"Humans, for example, may hold on a hot plate that contains food whereas they may drop an empty plate, showing that we take into account differing motivational requirements when responding to pain.

"Trade-offs of this type have not been previously demonstrated in crustaceans. The results are consistent with the idea of pain being experienced by these animals."

Previous work at Queen's University found that prawns show prolonged rubbing when an antenna was treated with weak acetic acid but this rubbing was reduced by local anaesthetic.

The findings are both studies are consistent with observations of pain in mammals.

But Professor Elwood says that in contrast to mammals, little protection is given to the millions of crustaceans that are used in the fishing and food industries each day.

He added: "More research is needed in this area where a potentially very large problem is being ignored.

"Legislation to protect crustaceans has been proposed but it is likely to cover only scientific research.

"Millions of crustacean are caught or reared in aquaculture for the food industry.

"There is no protection for these animals (with the possible exception of certain states in Australia) as the presumption is that they cannot experience pain.

"With vertebrates we are asked to err on the side of caution and I believe this is the approach to take with these crustaceans."

Views expressed in this article do not necessarily reflect those of UnderwaterTimes.com, its staff or its advertisers.

Reader Comments

2 people have commented so far. cloud add your comment

Don't you know carrots scream like crazy when pulled from the ground ??? Should I stop eating them ??? Or how about cow and pig, should I stop eating them too ??? Well then, what should I eat ??
   comment# 1   - Dick E. Lobsta · USA · Mar 29, 2009 @ 7:07am

Maybe the point of this article is not so much that we stop eating crabs-and other crustaceans-but that these creatures can and should be afforded better care and when they are kept in captivity for use in food so as to minimise stress and pain and also, that they should perhaps be killed using techniques that ensure death is as quick and painless as we can possible make it. But thanks, Underwater Times, for yet another informative and interesting article.
   comment# 2   - Shilpa · Sydney, Australia · Mar 29, 2009 @ 10:27pm
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