Navigation Links
'Shell-shocked' crabs can feel pain
Date:1/16/2013

The latest study by Professor Bob Elwood and Barry Magee from Queen's School of Biological Sciences looked at the reactions of common shore crabs to small electrical shocks, and their behaviour after experiencing those shocks. The research has been published in the Journal of Experimental Biology.

Professor Elwood's previous research showed that prawns and hermit crabs respond in a way consistent with pain. This latest study provides further evidence of this.

Professor Elwood said: "The experiment was carefully designed to distinguish between pain and a reflex phenomenon known as nociception. The function of pain is to aid future avoidance of the pain source, whereas nociception enables a reflex response that provides immediate protection but no awareness or changes to long-term behaviour.

"While nociception is generally accepted to exist in virtually all animals the same is not true of pain. In particular, whether or not crustaceans experience pain remains widely debated."

This latest study showed that shore crabs are willing to trade something of value to them in this case a dark shelter to avoid future electric shock.

Explaining how the experiment worked, Professor Elwood said: "Crabs value dark hideaways beneath rocks where they can shelter from predators. Exploiting this preference, our study tested whether the crabs experienced pain by seeing if they could learn to give up a valued dark hiding place in order to avoid a mild electric shock.

"Ninety crabs were each introduced individually to a tank with two dark shelters. On selecting their shelter of choice, some of the crabs were exposed to an electric shock. After some rest time, each crab was returned to the tank. Most stuck with what they knew best, returning to the shelter they had chosen first time around, where those that had been shocked on first choice again experienced a shock. When introduced to the tank for the third time, however, the vast majority of shocked crabs now went to the alternative safe shelter. Those not shocked continued to use their preferred shelter.

"Having experienced two rounds of shocks, the crabs learned to avoid the shelter where they received the shock. They were willing to give up their hideaway in order to avoid the source of their probable pain."

Professor Elwood says that his research highlights the need to investigate how crustaceans used in food industries, such as crabs, prawns and lobsters, are treated. He said: "Billions of crustacean are caught or reared in aquaculture for the food industry. In contrast to mammals, crustaceans are given little or no protection as the presumption is that they cannot experience pain. Our research suggests otherwise. More consideration of the treatment of these animals is needed as a potentially very large problem is being ignored.

"On a philosophical point it is impossible to demonstrate absolutely that an animal experiences pain. However, various criteria have been suggested regarding what we would expect if pain were to be experienced. The research at Queen's has tested those criteria and the data is consistent with the idea of pain. Thus, we conclude that there is a strong probability of pain and the need to consider the welfare of these animals."


'/>"/>

Contact: Anne-Marie Clarke
comms.officer@qub.ac.uk
44-028-909-75320
Queen's University Belfast
Source:Eurekalert  

Related biology news :

1. Crabs, insects and spiders vulnerable to oil spill, but also resilient
2. Preventing home invasions means fighting side-by-side for coral-dwelling crabs and shrimp
3. Humidity increases odor perception in terrestrial hermit crabs
4. Deep-sea crabs seek food using ultraviolet vision
5. Hermit crabs socialize to evict their neighbors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
'Shell-shocked' crabs can feel pain
(Date:11/24/2016)... 23, 2016 Cercacor today introduced Ember TM ... trainers non-invasively measure hemoglobin, Oxygen Content, Oxygen ... Respiration Rate in approximately 30 seconds. Smaller than a ... immediate access to key data about their bodies to ... regimen. Hemoglobin carries oxygen to muscles. ...
(Date:11/22/2016)... , Nov. 22, 2016   MedNet Solutions , ... entire spectrum of clinical research, is pleased to announce ... LiveWire Healthcare and Life Sciences Awards as "Most ... off an unprecedented year of recognition and growth for ... over 15 years. iMedNet ™ ...
(Date:11/19/2016)... 18, 2016 Securus Technologies, a leading provider ... safety, investigation, corrections and monitoring, announced today that it ... to have an independent technology judge determine who has ... high tech/sophisticated telephone calling platform, and the best customer ... do most of what we do – which clearly ...
Breaking Biology News(10 mins):
(Date:12/6/2016)... (PRWEB) , ... December 06, 2016 , ... ... on December 1, 2016 asking the Federal Drug Administration (FDA) to consider OA ... of OA, OARSI is concerned about the growing population of OA patients, many ...
(Date:12/6/2016)... ... December 06, 2016 , ... ... announced today that the company has engaged in a collaborative research partnership with ... with the CSU Office of the Vice President for Research. This agreement is ...
(Date:12/6/2016)... SAN DIEGO , Dec. 6, 2016 /PRNewswire/ ... Santosh Kesari , MD, PhD, FANA, FAAN to ... experience in neurology and clinical trials to assist the ... treatment of stroke. The AmnioStem product is a universal donor ... shown therapeutic activity in animal models of stroke 1 ...
(Date:12/6/2016)... Dec. 6, 2016  The Texas Medical Center ... Australia (HISA) today announced the establishment of a ... between Australia and the Texas ... HISA and the Texas Medical Center, ... to create a global health innovation ecosystem where emerging ...
Breaking Biology Technology: