noun
sea trout; salmon trout
Refers to a sea-run trout, often specifically the anadromous form of the brown trout (Salmo trutta) or similar species. In Japanese contexts, it may be used for sea-run forms of native salmonids.
ウミマスは海から川に遡上して産卵する。
Sea trout migrate from the sea up rivers to spawn.
Compound of 海 (うみ, 'sea') and 鱒 (ます, 'trout'), literally 'sea trout'. The katakana spelling reflects the usual kana usage for this term.