Histopathological characterisation of retinal lesions associated to Diplostomum species (Platyhelminthes : Trematoda) infection in polymorphic Arctic charr Salvelinus alpinus - Padrós, Francesc, 1965-, dir. (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Knudsen, R. (UiT The Arctic University of Norway. Department of Arctic and Marine Biology) ; Blasco-Costa, I. (Natural History Museum of Geneva)