Abstract / Introduction / Summary:
Adults of both sexes of Argulus coregoni Thorell,1864 were collected from the body surface of masu salmon Oncorhynchus masou masou (Brevoort, 1856) and white-spotted charr Salvelinus leucomaenis leucomaenis (Pallas, 1814) in Nen-nen-sawa Creek, a tributary of the Akka River, at Nen-nen in Iwaizumi, Iwate Prefecture, northern Honshu, Japan. This represents the first record for A. coregoni from Iwate Prefecture, and Nen-nen-sawa Creek is a new locality record. The parasite is briefly described.
