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A bio-economic analysis of experimental selective devices in the Norway lobster (Nephrops norvegicus) fishery in the Bay of Biscay

Published online by Cambridge University Press:  28 November 2012

Adriana Raveau ,
Claire Macher ,
Sonia Méhault ,
Mathieu Merzereaud ,
Christelle Le Grand ,
Olivier Guyader ,
Michel Bertignac ,
Spyros Fifas  and
Jordi Guillen
Adriana Raveau
Affiliation:
Université de Brest, UMR AMURE, IUEM, 12 rue du Kergoat, CS 93837, 29238 Brest Cedex 3, France
Claire Macher*
Affiliation:
IFREMER, UMR AMURE, Dép. RBE, Unité d’Economie maritime, BP 70, 29280 Plouzané Cedex, France
Sonia Méhault
Affiliation:
IFREMER, Dép. RBE, Unité de Sciences et Technologies halieutiques, Station de Lorient, 8 rue François Toullec, 56100 Lorient, France
Mathieu Merzereaud
Affiliation:
IFREMER, UMR AMURE, Dép. RBE, Unité d’Economie maritime, BP 70, 29280 Plouzané Cedex, France
Christelle Le Grand
Affiliation:
Oceanic Developpement, Consulting Office, 28 quai de la Douane, 29200 Brest, France
Olivier Guyader
Affiliation:
IFREMER, UMR AMURE, Dép. RBE, Unité d’Economie maritime, BP 70, 29280 Plouzané Cedex, France
Michel Bertignac
Affiliation:
IFREMER, Dép. RBE, Unité Sciences et Technologies halieutiques, BP 70, 29280 Plouzané Cedex, France
Spyros Fifas
Affiliation:
IFREMER, Dép. RBE, Unité Sciences et Technologies halieutiques, BP 70, 29280 Plouzané Cedex, France
Jordi Guillen
Affiliation:
IFREMER, Dép. RBE, Unité Sciences et Technologies halieutiques, BP 70, 29280 Plouzané Cedex, France
*
a Corresponding author: claire.macher@ifremer.fr
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Abstract

Several fleets with various fishing strategies operate as a mixed fishery in the Bay of Biscay. Among the main fleets, bottom trawlers target Norway lobster (Nephrops norvegicus) and, together with gillnetters, they also catch hake (Merluccius merluccius). Trawling leads to average-size catches that are below the minimum landing size (MLS); such catches are discarded since they cannot be sold. These discards result in negative impacts on stock renewal, as most of them do not survive. This also results in an economic loss for both bottom trawlers and gillnetters since these discards represent a future loss of rent. This study, based on the 2009 and 2010 selectivity experiments at sea, assesses the short- and long-term bio-economic impacts of four experimental selective devices aimed at reducing N. norvegicus and M. merluccius discards over a 20-year simulation period. Tests were conducted at sea on a research trawler. Using the impact assessment model for fisheries management (IAM model), selectivity scenarios for trawlers in the Bay of Biscay were compared to a theoretical selective scenario of adopting an optimal device that catches only N. norvegicus and M. merluccius above MLS (9 cm and 27 cm total length, respectively). Costs and benefits were analyzed with the objective of finding the best compromise between a reduction in discards of undersized fish and a loss of valuable catches among the experimental devices. Selectivity scenarios show positive impacts on stocks but different economic impacts between fleets. The combination of a square mesh cylinder with a grid and square mesh panels gives the closest results to the theoretical scenario tested in terms of stock recovery and economic benefits. This experimental device leads to low economic losses in the short term and eventually to higher N. norvegicus yields, which would be favourable for fleets that greatly contribute to N. norvegicus fishing efforts.

Keywords

Demersal trawl fisheryBio-economic analysisSelectivitySimulationSelective deviceNephrops norvegicus / Merluccius merlucciusAtlantic Ocean
Type
Research Article
Information
Aquatic Living Resources , Volume 25 , Issue 3 , July 2012 , pp. 215 - 229
Copyright
© EDP Sciences, IFREMER, IRD 2012

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