降こう河か魚ぎょ

noun

catadromous fish

Technical term in biology for fish that migrate from freshwater to the sea to spawn, such as eels. Contrasts with 遡河魚 (anadromous fish).

See also: 遡河魚

• ウナギは降こう河か魚ぎょの代だい表ひょう例れいである。

  The eel is a typical example of a catadromous fish.

• 降こう河か魚ぎょは産さん卵らんのために川かわから海うみへ下くだる。

  Catadromous fish migrate downstream from rivers to the sea to spawn.