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Bycatch of the European purse seine tuna fishery in the Atlantic Ocean for the 2003–2007 period

Published online by Cambridge University Press:  04 February 2011

Monin Justin Amandè ,
Javier Ariz ,
Emmanuel Chassot ,
Alicia Delgado de Molina ,
Daniel Gaertner ,
Hilario Murua ,
Renaud Pianet ,
Jon Ruiz  and
Pierre Chavance
Monin Justin Amandè
Affiliation:
Université de Montpellier 2, Place Eugène Bataillon, 34090 Montpellier, France
Javier Ariz
Affiliation:
Instituto Español de Oceanografía, Apdo. Correos 1373, 38080 S/C Tenerife, Canary Island, Spain
Emmanuel Chassot
Affiliation:
Institut de Recherche pour le Développement, CRHMT - UMR 212, Avenue Jean Monnet, BP 171, 34200 Sète Cedex, France
Alicia Delgado de Molina
Affiliation:
Instituto Español de Oceanografía, Apdo. Correos 1373, 38080 S/C Tenerife, Canary Island, Spain
Daniel Gaertner
Affiliation:
Institut de Recherche pour le Développement, CRHMT - UMR 212, Avenue Jean Monnet, BP 171, 34200 Sète Cedex, France
Hilario Murua
Affiliation:
AZTI Tecnalia, Herrera Kaia, Portualde z/g, 20110 Pasaia (Gipuzkoa), Spain
Renaud Pianet
Affiliation:
Institut de Recherche pour le Développement, CRHMT - UMR 212, Avenue Jean Monnet, BP 171, 34200 Sète Cedex, France
Jon Ruiz
Affiliation:
AZTI Tecnalia, Herrera Kaia, Portualde z/g, 20110 Pasaia (Gipuzkoa), Spain
Pierre Chavance*
Affiliation:
Institut de Recherche pour le Développement, CRHMT - UMR 212, Avenue Jean Monnet, BP 171, 34200 Sète Cedex, France
*
a Corresponding auteur: Pierre.Chavance@ird.fr
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Abstract

Bycatch of several groups of species and their characteristics are presented for the period 2003 to 2007 for the European purse seine tuna fishery operating in the Atlantic Ocean. Data were collected through French and Spanish observer programmes and represented a total of 27 trips corresponding to 2.9% coverage. Bycatch is defined as non-targeted species and small or damaged target species. Bycatch species composition, main species length, sex ratio and the fate of the most common species are presented first. Stratified ratios relative to landings of major commercial tunas were then used to estimate the total bycatch; these ratios were considered the most appropriate variable for extrapolation. Stratification was based on the fishing mode (free school vs. floating object), season (quarters) and spatial areas. The annual average bycatch was estimated at about 6400 t, corresponding to a mean annual value of 80.8 t per 1000 t of tuna landed or 7.5% of the total catch. Tunas represent 83% (67.2 t/1000 t) of the total bycatch, followed by other bony fishes (10%, 7.8 t/1000 t), billfishes (5%, 4.0 t/1000 t), sharks (1%, 0.9 t/1000 t) and rays (1%, 0.9 t/1000 t). Based on estimates of the annual bycatch, 16% was kept on board and sold in local markets.

Keywords

BycatchDiscardsTuna fisheriesPurse seiningAtlantic Ocean
Type
Research Article
Information
Aquatic Living Resources , Volume 23 , Issue 4 , October 2010 , pp. 353 - 362
Copyright
© EDP Sciences, IFREMER, IRD 2011

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