Article

Tactile stimulation lowers stress in fish

  • Nature Communications 2, Article number: 534 (2011)
  • doi:10.1038/ncomms1547
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Abstract

In humans, physical stimulation, such as massage therapy, reduces stress and has demonstrable health benefits. Grooming in primates may have similar effects but it remains unclear whether the positive effects are due to physical contact or to its social value. Here we show that physical stimulation reduces stress in a coral reef fish, the surgeonfish Ctenochaetus striatus. These fish regularly visit cleaner wrasses Labroides dimidiatus to have ectoparasites removed. The cleanerfish influences client decisions by physically touching the surgeonfish with its pectoral and pelvic fins, a behaviour known as tactile stimulation. We simulated this behaviour by exposing surgeonfish to mechanically moving cleanerfish models. Surgeonfish had significantly lower levels of cortisol when stimulated by moving models compared with controls with access to stationary models. Our results show that physical contact alone, without a social aspect, is enough to produce fitness-enhancing benefits, a situation so far only demonstrated in humans.

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Acknowledgements

We thank the directors and staff of Lizard Island Research Station for their support and friendship. We also thank Isabelle Côté for helpful comments on an earlier version of the manuscript. Ethical permits were provided by The University of Queensland. M.C.S. is supported by the Portuguese Foundation for Science and Technology-FCT (grant PTDC/MAR/105276/2008), R.B. and A.F.H.R. are financed by the Swiss Science Foundation (SNF) and R.F.O. by the the Pluriannual Programme of FCT (R&D Unit 331/2001). We are grateful to Pedro Gonçalves for making the mechanical apparatus and all cleaner models. We also thank Ana Sofia Felix for running the hormone assays. The use of animals and data collection complied with the laws of Australia, Portugal and Switzerland.

Author information

Affiliations

  1. Unidade de Investigação em Eco-Etologia, ISPA - Instituto Universitário, Rua Jardim do Tabaco 34, 1149-041 Lisboa, Portugal.

    • Marta C. Soares
    •  & Rui F. Oliveira
  2. Université de Neuchâtel, Institut de Zoologie, Rue Emile-Argand, 11, 2009 Neuchâtel, Switzerland.

    • Marta C. Soares
    • , Albert F.H. Ros
    •  & Redouan Bshary
  3. Champalimaud Neuroscience Programme, Instituto Gulbenkian de Ciência, Oeiras, Portugal.

    • Rui F. Oliveira
  4. The University of Queensland, School of Biological Sciences, St Lucia, Queensland 4072, Australia.

    • Alexandra S. Grutter

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Contributions

M.C.S. and R.B. planned the research; M.C.S. collected and analysed data; M.C.S., R.F.O., A.F.H.R., A.S.G. and R.B. wrote the paper.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Marta C. Soares.

Supplementary information

Videos

  1. 1.

    Supplementary Movie 1

    An interaction event where a surgeonfish allocated to treatment approaches a moving cleaner model.

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