Definition of anadromous in English:

anadromous

adjective

Zoology
  • (of a fish such as the salmon) migrating up rivers from the sea to spawn.

    The opposite of catadromous
    • ‘Pacific salmon are anadromous (sea-run) fish that migrate from freshwater to the ocean and then back to freshwater to spawn.’
    • ‘Chinook Salmon are anadromous, making great migrations out to the deepest parts of the ocean and returning as mature adults to their natal streams.’
    • ‘Unlike lampreys, salmon, and other anadromous fish, which migrate from the ocean to fresh water to breed, eels head in the opposite direction.’
    • ‘Although most representatives of the species are of the inland form, some populations of bull trout are anadromous and can co-exist with dolly varden char along the coast.’
    • ‘For example, the anadromous osmerids typically spawn in shallow water.’

Origin

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

Pronunciation:

anadromous

/əˈnadrəməs/