Large fishing boats (above) work the sea off Gloucester. Small-boat scallop fishermen are worried about being overwhelmed by larger boats in the Gulf of Maine. Because of a regulatory loophole, the large vessels have no quota on the amount they can catch, unlike their smaller counterparts that are limited to 200 pounds per day. At right, crew member Harlan Simmons worked with scallops dredged up to the Overkill Time. The ship’s captain, Jim Wotton, says the bigger boats are “taking our future.’’ B1.