In the open waters, Atlantic mackerel (Scomber scombrus), Atlantic herring (Clupea harengus) and blue whiting (Micromesistius poutassou) are caught commercially. Along the coast in shallow habitats, flat fish species of commercial value are Greenland halibut (Reinhardtius hippoglossoides), monkfish (Lophius piscatorius) and Atlantic halibut (Hippoglossus hippoglossus). Key species of the coastal region includes common eider (Somateria mollissima), geese (Anser and Branta), guillemots (Uria and Cepphus), puffin (Fratercula arctica), cormorants (Phalacrocorax) and gulls (Laridae), including black-legged kittiwake (Rissa tridactyla). Most seals are fish eaters, but they also feed on crustacean, octopus and mollusk.