entry
catadromy
/kəˈtædrəmi/Downstream migration of fish to reproduce
From Greek kata- (down) + Greek drom- (running).
Word Ancestry
Picture a fish doing the aquatic equivalent of leaving home: it grows up in a river, heads downstream, and eventually reaches the sea to reproduce. The name combines Greek κατά, “down,” with δρόμος, “a course” or “running”—so catadromy is essentially a “downward course.” The second root has an unexpectedly busy family: a hippodrome was a track for horses, a palindrome is something that “runs back” the same way, and a dromedary is linked to the idea of running. Aristotle was already describing fish movements in the fourth century BCE, long before zoologists equipped the behavior with this tidy Greek label. Remember the image: anadromous fish climb the river like salmon going upstairs; catadromous fish take the downstream road to the sea.
The Story
Picture a fish doing the aquatic equivalent of leaving home: it grows up in a river, heads downstream, and eventually reaches the sea to reproduce. The name combines Greek κατά, “down,” with δρόμος, “a course” or “running”—so catadromy is essentially a “downward course.” The second root has an unexpectedly busy family: a hippodrome was a track for horses, a palindrome is something that “runs back” the same way, and a dromedary is linked to the idea of running. Aristotle was already describing fish movements in the fourth century BCE, long before zoologists equipped the behavior with this tidy Greek label. Remember the image: anadromous fish climb the river like salmon going upstairs; catadromous fish take the downstream road to the sea.
Kin & Kindred
From 'kata-'·down, downward
Derived Terms
English words from this root
From 'drom-'·running, course, movement
Derived Terms
English words from this root
Sources
Wikipedia
Wiktionary