Definitions for "Catadromous"
Having the lowest inferior segment of a pinna nearer the rachis than the lowest superior one; -- said of a mode of branching in ferns, and opposed to anadromous.
Living in fresh water, and going to the sea to spawn; -- opposed to anadromous, and said of the eel.
Fish that mature in fresh water and migrate to salt water to spawn.
Having the first lobe or segment of a pinna arising acroscopically in compound leaves.