The "Sea Trout," aka Speckled Trout, or Speckled Sea Trout, of the southern US is not a Trout, or even a Salmonid. Looks like a Trout though.
There are real sea-going Salmonids, though, of which the Salmon is best known.
For Western US fishermen, the Steelhead Trout is another popular fish. It is a Rainbow Trout which, for some reasons, decided to live for a while in salt water.
Are there anadromous Brook Trout in Maine? Who knows? To complicate nomenclature, Brook Trout are not really trout - they are a Char.
Tips for autumn trout fishing. Some states and areas do a fall stocking. Few if any stocked fish survive summer or winter in streams, even with catch-and-release. They do not have enough adaptation.
100 facts about Trout - good fun