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Issue Knowl. Managt. Aquatic Ecosyst.
Number 389, 2008
Article Number 04
Number of page(s) 16
DOI 10.1051/kmae:2008005
Published online 10 January 2009

Knowl. Managt. Aquatic Ecosyst. (2008) 389 : 04
DOI: 10.1051/kmae:2008005

Assessment of the pelagic fish populations using CEN multi-mesh gillnets: consequences for the characterization of the fish communities

C. Deceliere-Vergès1, 2 and J. Guillard2

1  ASCONIT Consultants, 6–8 Espace Henry Vallée, 69007 Lyon, France
2  INRA UMR-CARRTEL, 75 av. de Corzent - BP 511, 74203 Thonon-les-Bains, France

charlotte.deceliere@asconit.com

Received August 22, 2008 / Revised October 29, 2008 / Accepted November 18, 2008 / Published online: 10 January 2009

Abstract
The contribution of CEN standard pelagic nets to the assessment of fish communities is tested by comparing three metrics (species composition, species abundance, and size structures) measured in accordance with the standard (i.e. using benthic nets only) to those calculated from the total effort (i.e. including pelagic nets). Hydroacoustic surveys were used simultaneously to assess fish densities in the pelagic habitat. The results show that in most cases the pelagic nets did not provide any extra information about these three metrics. However, their inclusion in the calculation of CPUE and size structures may affect the picture of the fish communities, especially in lakes containing salmonid populations. This study highlights the need to sample pelagic fish when assessing fish communities in order to determine lake quality.


Résumé - L’évaluation des populations de poissons pélagiques par les filets multi-mailles CEN : conséquences pour la caractérisation du peuplement
La contribution des filets pélagiques du standard CEN dans l’évaluation des peuplements piscicoles est testée en comparant les métriques (composition et abondance spécifiques, structures en tailles) mesurées conformément au standard (i.e. les filets benthiques seuls), à celles issues de l’effort total (i.e. incluant les filets pélagiques). L’hydroacoustique a été utilisée simultanément pour évaluer les densités de poissons dans l’habitat pélagique. Les résultats montrent que dans la plupart des cas, les filets pélagiques n’apportent pas d’informations supplémentaires sur les trois métriques. Toutefois, leur intégration dans le calcul des CPUE et des structures en tailles peut modifier l’image des peuplements notamment dans les lacs à salmonidés. Ce travail met en évidence la nécessité d’échantillonner les poissons pélagiques pour l’évaluation des peuplements en vue de définir la qualité du milieu.


Key words: lake -- pelagic zone -- fish metric -- CEN multi-mesh gillnets -- Water Framework Directive

Mots clés : lac -- zone pélagique -- métrique piscicole -- filets multi-mailles CEN -- Directive cadre européenne sur l’eau


© ONEMA 2009


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