1. sea trout any one of several species of true trouts which descend rivers and enter the sea after spawning, as the Europeanbulltrout and salmon trout, and the eastern American spotted trout
2. sea trout the common squeteague, and the spotted squeteague
3. sea trout a Californiafish of the family Chiridae, especially Hexagrammus decagrammus; -- called also spotted rocktrout. See Rock trout, under Rock