Definition of anadromous in English:

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anadromous

Pronunciation: /əˈnadrəməs/

adjective

Zoology
(Of a fish, such as the salmon) migrating up rivers from the sea to spawn. The opposite of catadromous.
Example sentences
  • Pacific salmon are anadromous (sea-run) fish that migrate from freshwater to the ocean and then back to freshwater to spawn.
  • Unlike lampreys, salmon, and other anadromous fish, which migrate from the ocean to fresh water to breed, eels head in the opposite direction.
  • Chinook Salmon are anadromous, making great migrations out to the deepest parts of the ocean and returning as mature adults to their natal streams.

Origin

Mid 18th century: from Greek anadromos (from ana- 'up' + dromos 'running') + -ous.

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