going from salt water to fresh water or up rivers to spawn: said of salmon, shad, etc.
Origin of anadromousClassical Greek anadromos ; from ana-, upward + dromos, a running ; from dramein, to run: see dromedary
Migrating up rivers from the sea to breed in fresh water. Used of fish.
Origin of anadromousFrom Greek anadromos, running up : ana-, ana- + dromos, a running.
salmon at Brooks Falls, Katmai National Park and Preserve, Alaska
From Ancient Greek ἀνάδρομος (anadromos), from ἀνά (ana, “up”) + δρόμοs (dromos, “running”).