Is European catfish a threat to eels in southern France?

• Published in: Aquatic Conservation: Marine and Freshwater Ecosystems
• Main Authors: Martino, Aurelia, Syväranta, Jari, Crivelli, Alain Jean, Céréghino, Régis, Santoul, Frédéric
• Other Authors: Centre National de la Recherche Scientifique - CNRS (FRANCE), Leibniz-Institut für Gewässerökologie und Binnenfischerei - IGB (GERMANY), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Tour du Valat - Centre de recherche pour la conservation des zones humides méditerranéennes (FRANCE)
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley-Blackwell 2011
• Subjects: Biodiversité et Ecologie; Zoologie des invertébrés; Ecosystèmes; European eel; Conservation; European catfish; Stable isotope analysis; Gut contents; Camargue; Anguilla anguilla
• Online Access: https://oatao.univ-toulouse.fr/10155/; https://oatao.univ-toulouse.fr/10155/1/Martino_10155.pdf; https://doi.org/10.1002/aqc.1177

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.