Influence of introduced vs. native parasites on the body condition of migrant silver eels Claudia Gérard, Thomas Trancart, Elsa Amilhat, Elisabeth Faliex, Laure Virag, Eric Feunteun and Anthony Acou Parasite, 20 (2013) 38 Published online: 21 October 2013 DOI: 10.1051/parasite/2013040