adj.为产卵顺流而下的
Usually at a definite stage in the life cycle, e.g. anadromous, catadromous, diadromous, amphidromous, potamodromous, oceanodromous. 通常在生命周期的时期，例如溯河洄游产卵，降海洄游，河海洄游的，河海两域洄游的，河川洄游，海洋洄游。
dromous Running in a direction, used with prefixes for describing fish migratory habits, e.g. anadromous, catadromous. 迴游的描述鱼类迁徙的习惯，例如溯河洄游产卵或降海洄游。
catadromous fish 降河鱼
