Alaska plaice ("Pleuronectes quadrituberculatus") are salt water fish that live in the north Pacific Ocean. Like most flatfish, they live on the bottom of the continental shelf, up to 600 metres deep. Their geographical range is from the Gulf of Alaska in the east, to the Chukchi Sea in the north, to the Sea of Japan in the west. Alaska plaice feed mostly on polychaetes, but also eat amphipods and echiurans.