(of fish) migrating from fresh water to spawn in the sea, as eels of the genus Anguilla (distinguished from anadromous).
Origin of catadromous
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Catadromous, kat-ad′rom-us, adj. of fishes, descending periodically for spawning to the lower parts of a river or to the sea.
Of the catadromous fishes there is a single example in our waters--the common eel.Boy Scouts Handbook
Boy Scouts of America
Word Origin for catadromous
C19: from Greek katadromos, from kata- down + dromos, from dremein to run
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012