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Is European catfish a threat to eels in southern France?

Martino, Aurelia and Syväranta, Jari and Crivelli, Alain Jean and Céréghino, Régis and Santoul, Frédéric Is European catfish a threat to eels in southern France? (2011) Aquatic Conservation: Marine and Freshwater Ecosystems, 21 (3). 276-281. ISSN 1052-7613

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Official URL: http://dx.doi.org/10.1002/aqc.1177

Abstract

1. European eel (Anguilla anguilla) is recognized as a critically endangered species in the northern hemisphere. Threats such as overfishing or pollution are well known as risks for eel populations. However, much less is known about the impact of introduced fish on European eels. In particular, introduced large-bodied predators could become new predators to eels. 2. The potential impact of European catfish (Silurus glanis L) on an eel population in the Camargue, southern France was studied using a combination of stable isotope and gut content analyses. 3. Only large bodied catfish (> 500 mm) can consume numerous fish prey. However, catfish mostly consumed crayfish (Procambarus clarkii), these prey items being found in 79% of the guts of the largest individuals. Eel was absent from the dissected catfish guts. A mixing model based on Bayesian inference revealed that catfish diet included only 5% (0-8.5%) of marine sources (both eel and mullet). 4. While local economic interests prompted ecological studies to assess whether catfish exerted a new and strong predatory pressure on eel, this study found that European catfish behaved as an opportunistic omnivore, and as such was not a direct threat as a predator on eel populations in the Camargue.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Leibniz-Institut für Gewässerökologie und Binnenfischerei - IGB (GERMANY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Tour du Valat - Centre de recherche pour la conservation des zones humides méditerranéennes (FRANCE)
Laboratory name:
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Deposited By: Régis Cereghino
Deposited On:02 Dec 2013 08:55

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