The Collaborative International Dictionary of English v.0.48:
Sea trout \Sea" trout`\ (Zool.)
(a) Any one of several species of true trouts which descend
rivers and enter the sea after spawning, as the European
bull trout and salmon trout, and the eastern American
(b) The common squeteague, and the spotted squeteague.
(c) A California fish of the family Chiridae, especially
Hexagrammus decagrammus; -- called also spotted rock
trout. See Rock trout, under Rock.
(d) A California sciaenoid fish (Cynoscion nobilis); --
called also white sea bass.