I don't know the answer but I rely on Cape Anne fresh fish share which weekly delivers the best of available winter local fish, or I see what Cyndi the Fishlady is delivering every Tuesday at When Pigs Fly in Brookline or I call New Deal in Cambridge and ask Carl.
There's also Cape Cod Fish Share, which has line caught catch from 9 boats out of Chatham. That's from talking to them at the winter Brookline Farmers Market. I think they run 5 week shares multiple times a year.
The local Cape Cod or Nantucket Bay Scallop is IMO the best local seafood available in the winter. Only available from Oct/Nov until March or so, it is super sweet, tender, and tasty. Raw, flash fried, or quickly seared is my preferred method of preparation