A few fish species in the Southern Ocean are harvested commercially. The Patagonian toothfish (Dissostichus eleginoides) is the most important commercial species, and is fished by longlines at deep waters on the shelf break. The mackerel icefish (Champsocephalus gunnari) is caught to a limited extent and under strict regulations in the Scotia Sea.
Squid in the Antarctica are very common, but like in most ecosystems, their ecological role is not well understood. They range in size from small to gigantic and are important prey for higher trophic levels. In waters adjacent to the Southern Ocean, e.g. around the Falkland Islands, there are big fisheries for squid.