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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 23, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(7):1402-1413; doi:10.1093/icesjms/fsm071
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Effect of management measures on glass eel escapement

Laurent Beaulaton1, and Cédric Briand2

1 CEMAGREF, "Estuarine ecosystems and diadromous fish" Research Unit, 50 avenue de Verdun, 33612 Cestas Cedex, France
2 Institution d'Aménagement de la Vilaine, Boulevard de Bretagne, 56 130 La Roche Bernard, France

Correspondence to L. Beaulaton: tel: +33 5 57 89 27 17; fax: +33 5 57 89 08 01; e-mail: laurent.beaulaton{at}bordeaux.cemagref.fr

Stocks of European eel (Anguilla anguilla) have declined continuously and steadily, since 1980. A model, GEMAC, namely Glass Eel Model to Assess Compliance, has been developed with the objective of assessing anthropogenic impacts on glass eels in estuaries and evaluating the effects of management measures, to support initiatives aimed at helping the eel stocks recover. The model is described and applied to two estuaries with contrasting anthropogenic pressures: the Vilaine and the Garonne. It assesses the proportion of settled glass eels relative to a non-impacted situation with current (%S/R) or pristine recruitment (%S/R0). The estimated %S/R (%S/R0) is 5.5% (1.1%) for the Vilaine and 78% (19%) for the Garonne, in accord with the different levels of anthropogenic pressure in these two estuaries. A sensitivity analysis shows that the assessment of %S/R is accurate, and that in a data-poor context, the %S/R is under-assessed, as required by the precautionary approach. Seven management scenarios are explored all aiming to halve the anthropogenic pressure, but in fact leading to different levels of glass eel escapement, from almost zero to a 13-fold increase. This variation emphasizes the need for the estuarine context of eel stock management to be carefully evaluated for effectiveness when implementing management measures.

Keywords: anthropogenic mortality, fisheries management, GEMAC, glass eel, process-based model

Received 3 January 2007; accepted 29 April 2007; advance access publication 23 June 2007.


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