单词：anadromous 

形容词

• 
  [1.a.anadromous] (同义词:[anadromous( adj. (海鱼)溯河产卵的 )]  )
• 
  注释列句：migrating from the sea to fresh water to spawn
• 反义词 -> [catadromous( adj. 为产卵顺流而下的 )]  [diadromous( adj. [植]有扇状叶脉的 )]