記録・調査報告
北海道南部の小河川におけるブラウントラウトSalmo truttaの海を介した侵入
2020 年 67 巻 2 号 p. 241-245
詳細
2020 年 67 巻 2 号 p. 241-245
A non-native brown trout Salmo trutta (407 mm in fork length, 717 g in body weight) was collected from the Otsukushinai River, southern Hokkaido, Japan, in 2019. This specimen was an immature male (0.4 g in gonad weight). The otolith Sr:Ca ratio profile and annual rings suggested that the specimen had migrated to the sea at the age of 4+ years and ascended the Otsukushinai River in the year of the seaward migration. This study is the first record of invasion of anadromous brown trout through the sea in Japan.
