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ICES Journal of Marine Science: Journal du Conseil 2004 61(1):71-83; doi:10.1016/j.icesjms.2003.09.002
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Quantification of annual variations in fishing power due to vessel characteristics: an application to the bottom-trawlers of South-Brittany targeting anglerfish (Lophius budegassa and Lophius piscatorius)

S Mahévasa,*, Y Sandonb and A Biseaub

a IFREMER Laboratory MAERHA BP 21105, 44311 Nantes Cedex 03, France
b IFREMER 8 Rue François Toullec, 56100 Lorient, France

*Correspondence to S. Mahévas; tel: +33 240374181; fax: +33 240374075. e-mail: stephanie.mahevas{at}ifremer.fr.

We present a method based on generalised linear models fitted to CPUE data to quantify the changes in fishing power in a fleet targeting a particular species. Changes in the fleet's fishing power are differentiated from variations in population abundance through the use of an abundance index estimated from the CPUE of an index vessel catching the species as by-catch. Observed inter-vessel differences in efficiency are then explained by vessel characteristics such as gear used, engine power, length of headline and ground rope, availability of GPS and skipper skills. The application of the method to the French bottom-trawlers targeting anglerfish in the Bay of Biscay and in the Celtic Sea during the period 1983–1998 reveals that fishing gear (twin or simple trawls) and engine power are the most important variables for explaining differences in fishing power.

Nous présentons une méthode basée sur l'utilisation de modèles linéaires généralisés ajustés à des données de CPUE pour quantifier les changements de puissances de pêche dans une flottille ciblant une espèce particulière. Les changements de puissance de pêche sont distingués des variations d'abondance de la population en utilisant un indice d'abondance estimé à partir des CPUE d'un bateau témoin capturant cette espèce de manière accessoire. Les différences d'efficacité observées entre les bateaux sont ensuite expliquées par les caractéristiques techniques telles que l'engin utilisé, la puissance motrice, la longueur de la corde de dos, le bourrelet, la possession d'un GPS et l'expérience du capitaine. L'application de la méthode aux chalutiers de fond français ciblant la baudroie dans le golfe de Gascogne et la mer Celtique sur la période 1983–1998 a montré que la puissance motrice et l'engin de pêche (chalut jumeau ou simple) étaient les facteurs qui expliquaient le plus les différences de puissance de pêche.

Keywords: abundance index, Bay of Biscay, catches per unit of effort (CPUE), Celtic Sea, generalised linear models, métier, twin trawls, Baudroies, Captures par unité d'effort (CPUE), chaluts jumeaux, golfe de Gascogne, indice d'abondance, mer Celtique, métier, Modèles Linéaires Généralisés, Puissance de pêche

Received 20 November 2002; accepted 7 September 2003.


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ICES J. Mar. Sci., June 1, 2009; 66(5): 916 - 927.
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