Peter,
If you can believe this, we've had years when they have come up river into the Merrimac River 4 and more miles and start feeding frenzies just of boat docks where they have spooked out some "schoolie bass." I've seen 16-20 lb. blues caught from the dock! Very cool fun to wach all the guys down at the docks diving for their rods to get in on the action. One time they threw enough bait lures and kitchen sinks at them to hold'em for 20 minutes and more.