BURRFISH; PORCUPINEFISH; RABBITFISH; OYSTERFISH
Closely allied with the Puffer. The members of these two families are capable of inflating their bellies to balloonlike proportions with air or with water, if annoyed, and of deflating at will. And it is a matter of general interest (though not touching the Gulf of Maine directly) that the flesh of some of the species of puffers, and perhaps of all of the porcupine fishes, is poisonous.
From Fishes of the Gulf of Maine by Bigelow and Schroeder (1953) online courtesy of MBL/WHOI http://www.gma.org/fogm/Chilomycterus_schoepfii.htm
Good Morning Gloucester 