Answer:

codfish

Answer	Crossword Clue
CODFISH	Martha's Vineyard catch
CODFISH	Symbol of Boston.
CODFISH	New England specialty.

CODFISH	Oil source
CODFISH	Massachusetts' "... aristocracy"
CODFISH	Catch in the North Atlantic
CODFISH	Limerick, part three: "She dined on ..."
CODFISH	Atlantic swimmer
CODFISH	North Atlantic delicacy