Stress is not pain. Comment on Elwood and Adams (2015) 'Electric shock causes physiological stress responses in shore crabs, consistent with prediction of pain'.

Department of Biomedical Science, Atlantic Veterinary College, Charlottetown, Prince Edward Island, Canada Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Humboldt-Universität zu Berlin, Berlin, Germany Institute of Marine Research, Storebø, Norway Department of Biology, Carleton University, Ottawa, Ontario, Canada Hull International Fisheries Institute, University of Hull, Hull, Humberside, UK DigsFish Services, Banksia Beach, Australia Department of Biomedical Sciences, University of Queensland, St Lucia, Queensland, Australia Department of Zoology and Physiology, University of Wyoming Laramie, WY, USA Infofish Australia, Frenchville, Australia Biglen, Switzerland Tropical Aquaculture Laboratory, University of Florida, Gainesville, FL, USA Department Psychology, Arizona State University, Tempe, AZ 85287, USA