Atlantic cod text from the reference. Atlantic cod The Atlantic cod ("Gadus morhua") is a benthopelagic fish of the family Gadidae, widely consumed by humans. It is also commercially known as cod or codling. Dry cod may be prepared as unsalted stockfish, as cured salt cod or clipfish. In the western Atlantic Ocean, cod has a distribution north of Cape Hatteras, North Carolina, and around both coasts of Greenland and the Labrador Sea; in the eastern Atlantic, it is found from the Bay of Biscay north to the Arctic Ocean, including the Baltic Sea, the North Sea, Sea of the Hebrides, areas
Dried and salted cod cod was derived exclusively from Atlantic cod. Since then products sold as salt cod may be derived from other whitefish, such as pollock, haddock, blue whiting, ling and tusk. In Norway, there used to be five different grades of salt cod. The best grade was called superior extra. Then came (in descending order) superior, imperial, universal and popular. These appellations are no longer extensively used, although some producers still make the superior products. The best klippfisk, the superior extra, is made only from line-caught cod. The fish is always of the "skrei", the cod that once a year is caught