本州太平洋岸の安家川に溯上したカラフトマスについて

抄録

A specimen of the pink Salmon, Oncorhynchus gorbuscha (Walbuum), was caught at the lower Akka River: draining to the Pacific coast of the northern Honshu, Japan, on September 9, 1972,
The specimen wsa a mature male with black blotches on the buck and tail, and 357mm standard length Scales J the. specimen are small and 164 on the lateral line. Characters of this specimen are anal fin rays 16, gill-rakers 28 and pyloric caeca 108.These values are the range for the pink salmon Qm which were collected in Hokkaido and reported by Hikita (1962) as shown in Table 1.
Akka. River, the pink salmon.was caught, is situited about 70 km south of Oiirase River along the.Pacicific coast of Honshu.shu, Japan (Sato and Sato.1964).The return of the pink sailmon has not been previously reported from the rivers situated south of Oirase.River.Therefore, Akka River isat present soiuhertintost limit of the return of the pink salmon along the Parilic coast of lionshu, Japan.