Is European catfish a threat to eels in southern France? - Archive ouverte HAL Access content directly
Journal Articles Aquatic Conservation: Marine and Freshwater Ecosystems Year : 2011

Is European catfish a threat to eels in southern France?


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. 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. 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). 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.
Fichier principal
Vignette du fichier
Martino_10155.pdf (442.81 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-03469135 , version 1 (07-12-2021)



Aurelia Martino, Jari Syväranta, Alain Jean Crivelli, Régis Céréghino, Frédéric Santoul. Is European catfish a threat to eels in southern France?. Aquatic Conservation: Marine and Freshwater Ecosystems, 2011, 21 (3), pp.276-281. ⟨10.1002/aqc.1177⟩. ⟨hal-03469135⟩
97 View
195 Download



Gmail Mastodon Facebook X LinkedIn More