A decline in the occurrence of Diphyllobothrium plerocercoids in the trout Salmo trutta L. of Llyn Padarn, Caernarvonshire.
D000818:Animals; D002590:Cestode Infections / Q000453:epidemiology / Q000662:veterinary*; D004170:Diphyllobothrium; D005399:Fishes; D014852:Wales