catadromous

形容词 catadromous:

1. migrating from fresh water to the sea to spawn

ca.tad.ro.mous

adj.（形容词）
Living in fresh water but migrating to marine waters to breed. Used of fish.
因产卵顺流入海的：在淡水中生活但移到海水中产卵繁殖的。用于鱼类