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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 6, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(6):1057-1068; doi:10.1093/icesjms/fsn062
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Ecosystem trends: evidence for agreement between fishers' perceptions and scientific information

Marie-Joëlle Rochet1, Magali Prigent2, Jacques A. Bertrand1, André Carpentier3, Franck Coppin3, Jean-Paul Delpech3, Guy Fontenelle2, Eric Foucher4, Kelig Mahé3, Emilie Rostiaux3 and Verena M. Trenkel1

1 IFREMER, Département Ecologie et Modèles pour l'Halieutique, BP 21105, 44311 Nantes cedex 03, France
2 Pôle Halieutique, Agrocampus-Rennes, 65 Rue de St Brieuc, CS 84215, 35042 Rennes cedex, France
3 IFREMER, 150, quai Gambetta, BP 699, 62321 Boulogne-sur-Mer cedex, France
4 IFREMER, Avenue du Général de Gaulle, BP 32, 14520 Port-en-Bessin, France

Correspondence to M-J. Rochet: tel: +33 240 374121; fax: +33 240 374075; e-mail: mjrochet{at}ifremer.fr.

Rochet, M-J., Prigent, M., Bertrand, J. A., Carpentier, A., Coppin, F., Delpech, J-P., Fontenelle, G., Foucher, E., Mahé, K., Rostiaux, E., and Trenkel, V. M. 2008. Ecosystem trends: evidence for agreement between fishers' perceptions and scientific information. – ICES Journal of Marine Science, 65: 1057–1068.

The results of a survey on fishers' perceptions of recent changes in the eastern English Channel ecosystem carried out in 2006 were compared with fishery and bottom-trawl survey data. A hypothesis-testing framework was used, testing the null hypothesis that fishers' statements were true, which permitted evaluation of both agreement and disagreement. Overall good agreement between fishers' statements and scientific data was found, and both sources suggested that the fish community in the Channel is undergoing large changes, among which are decreases in some commercially important species; in addition, a number of human pressures impact the ecosystem. Fishers had an accurate perception of changes and their time-frames, but not necessarily of their causes. They had a greater power than survey data to detect recent changes, showing that fishers' perceptions have great potential as early warning signals.

Keywords: eastern English Channel, ecosystem approach to fisheries management, fisher knowledge, hypothesis testing, stakeholder interview

Received 26 October 2007; accepted 11 March 2008; advance access publication 6 May 2008.


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