抄録
The sea-run form of the Dolly Varden (Salvelinns malma) has not been recorded from Hokkaido, excepting two anadromous males (Flikita, 1962; Ishigaki, 1967).On April 23rd, 1972, a silvery specimen of the Dolly Varden, immature female and 153.1 mm in total length, was collected from the Shoji River in the Shiretoko Peninsula, northeastern Hokkaido. It was identified as a smolt of the Dolly Varden, and is a new record from Hokkaido. The tip of the dorsal fin was jet black and posterior margin of the caudal fin was faintly edged with black.
No significant differences were recognized.in the number of vertebrae, pored scales, pyloric caeca, and gill rakers, between the smolt and river resident form from the same district.
It was considered, from the point of geographical variation of the fish and geographical aspects of the Shiretoko district, that the fish might have hatched in the Shoji River.
