noun
anadromous fish
Technical term for fish that migrate from the sea up rivers to spawn, such as salmon. The reading さっかぎょ is also listed but is less common.
See also: 降河魚
サケは代表的な遡河魚です。
Salmon is a typical anadromous fish.
遡河魚は産卵のために川を遡ります。
Anadromous fish go up rivers to spawn.
Catadromous fish that migrate downstream to the sea to spawn, e.g. eels. Opposite migration pattern.
From 遡河 (soka, 'going upstream') + 魚 (gyo, 'fish'). The kanji 遡 means 'go upstream'.