amphidromous

adjective
am·​phid·​ro·​mous | \ (ˈ)am¦fidrəməs\

Definition of amphidromous

of fishes
: migrating from fresh to salt water or from salt to fresh water at some stage of the life cycle other than the breeding period

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First Known Use of amphidromous

1885, in the meaning defined above

History and Etymology for amphidromous

amphi- + -dromous

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The first known use of amphidromous was in 1885

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