catadromous

[kuh-tad-ruh-muhs]
adjective
(of fish) migrating from fresh water to spawn in the sea, as eels of the genus Anguilla (distinguished from anadromous ).

Origin:
1880–85; cata- + -dromous

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catadromous (kəˈtædrəməs)
 
adj
Compare anadromous (of fishes such as the eel) migrating down rivers to the sea in order to breed
 
[C19: from Greek katadromos, from kata- down + dromos, from dremein to run]

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Example sentences
These represent both anadromous and catadromous fish.
Eels are a catadromous species that ascend freshwater environments as juveniles.
Diadromous fish include both anadromous and catadromous species.
Catadromous-Migrating from fresh water into the ocean to spawn.
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