Massachusetts Bay is a vast and dynamic saltwater ecosystem forming part of the Gulf of Maine, stretching from Cape Ann to Plymouth. This expansive bay, which includes numerous smaller harbors and estuaries, serves as a major migratory corridor and feeding ground for a wide array of iconic Northeast sportfish. Its waters are characterized by a mix of deep offshore basins, rocky shoals, and intricate inshore structures, creating diverse habitats that support both resident and seasonal populations. The fishing here is intensely seasonal, driven by migrations, water temperature, and the abundance of bait, offering anglers a rich and varied fishery from the surf to the offshore grounds.