anadromous

adj.
Migrating up rivers from the sea to breed in fresh water. Used of fish.

[From Greek anadromos, running up : ana-, ana- + dromos, a running.]

Said of fish; those living most of their lives in the sea but entering rivers to spawn.

ascending rivers from the sea for breeding  (compare catadromous)
salmon are anadromous

Note: click on a word meaning below to see its connections and related words.

The adjective has one meaning:

Meaning #1: migrating from the sea to fresh water to spawn
  Antonyms: catadromous (meaning #1), diadromous (meaning #1)

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