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Towards a standardized characterization of the potentially migrating silver European eel (Anguilla anguilla L.)

Acou, Anthony and Boury, Pauline and Laffaille, Pascal and Crivelli, Alain Jean and Feunteun, Eric Towards a standardized characterization of the potentially migrating silver European eel (Anguilla anguilla L.). (2005) Archiv für Hydrobiologie, 164 (2). 237-255. ISSN 0003-9136

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Official URL: http://dx.doi.org/ 10.1127/0003-9136/2005/0164-0237

Abstract

We defined a standardized method for discriminating candidate silver eels that may undergo catadromous migration in the following season from the sedentary fraction of a population. A combination of two qualitative criteria (state of differentiation of the lateral line and colour contrast) and one quantitative criterion (Ocular Index OI) was used to determine the development toward silvering. In the non-migratory phase, we found a gradient of the three criteria between yellow (0 criterion), presilver (1 to 2 criteria) and silver (3 criteria) eels. In the migrant phase, silver eels had ended their metamorphosis process and were characterized at the same time by the presence of the 3 silvering criteria. A mark-recapture survey using PIT-tags provided evidence that only identified silver eels (3 silvering criteria present) in the catchment actually emigrated the following season. Moreover, the use of a single criterion of silvering among the three generated large variation in the estimated proportion of candidates for emigration which varied between –22% and +63 %. Such a result confirmed that a multicriteria approach is needed to characterize in a standard way the potentially migrating silver eel.

Item Type:Article
Additional Information:Thanks to Schweizerbart'sche Verlagsbuchhandlung. The original publication is available at http://www.ingentaconnect.com/
HAL Id:hal-00788600
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Tour du Valat - Centre de recherche pour la conservation des zones humides méditerranéennes (FRANCE)
Other partners > Université de La Rochelle (FRANCE)
Other partners > Université de Rennes 1 (FRANCE)
Laboratory name:
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Deposited By: Pascal LAFFAILLE
Deposited On:12 Feb 2013 13:28

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