Atlantic halibut are giant members of the flatfish family that inhabit the cold waters of the Atlantic from Norway, across the northern rim to Labrador, Nova Scotia and the Gulf of Maine. Juveniles, also called chicken halibut, live in shallower waters near shore, but larger adults called whale halibut, some of which reach 600 pounds, keep to depths between 900 and 6,000 feet. Atlantic halibut are slow-growing and territorial, which makes them vulnerable to overfishing. They are fished commercially with bottom longlines and trawls, and because of management measures, their populations appear to be increasing.