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The haddock (Melanogrammus aeglefinus) is a marine fish distributed on both sides of the North Atlantic. Haddock is a popular food fish and is widely fished commercially.

The common ling or simply the ling, Molva molva, is a large member of a family of cod-like fishes. An ocean fish whose habitat is in the Atlantic region and can be found around Iceland, Faroe Islands, British Isles, the Norse coast and occasionally around Newfoundland, the ling has a long slender body that can reach 2 metres in length; in adulthood, it is generally a deep-running fish, spending much of its life at depths of 100 m or more; younger fish are found at shallower depths. The ling is edible; its flesh is prized and can be considered interchangeable with cod in either its fresh, salted or dried forms. The salted roe of the ling is considered a delicacy in Spain and is known as huevas de maruca. The lutefisk – ling that is first dried, then soaked in water and then steeped in a lye of soda and slaked lime – is a traditional dish at the Christmas table in Sweden, Norway and Finland.

Gadus is a genus of demersal fish in the family Gadidae, commonly known as cod, although there are additional cod species in other genera. Until recently, three species in the genus were recognized. Modern taxonomy also includes a fourth one, the Alaska pollock (Gadus chalcogrammus), which is not separate from the Norway pollock. Furthermore, Greenland cod (G. ogac) is no longer considered a distinct species but rather a subspecies of Pacific cod (G. macrocephalus).