Study: Fish get a fin massage and feel more relaxed
19.05.12
The team confined each fish in a small bucket for a short period to simulate some stresses they would encounter in the wild: predation, conflicts with cleaner fish or competition for food, for instance. They then placed the surgeonfish into tanks with a fake cleaner fish. Surgeonfish ( Ctenochaetus striatus ) make regular use of fish called cleaner wrasse ( Labroides dimidiatus ) to remove their parasites and dead skin. We know that fish experience pain,&rdquo. Maybe fish have pleasure, too. Marta Soares of the ISPA University Institute in Lisbon noticed that the cleaners seem to offer another service: They can placate an agitated surgeonfish by rubbing back and forth on its pelvic and pectoral fins. One group was given a stationary model, the other a model that moved back and forth, and so could provide physical stimulation. Soares and her team set out to see if it was the social interaction or the feeling of the massage that kept the surgeonfish at ease. To test this, they studied two groups of eight surgeonfish.
Source: Washington Post