Atlantic cod (Gadus morhua), also known as Atlantic cod, common cod, cod or skrei1 for the Norwegian variety, is a species of fish in the family Gadidae living in the North Atlantic. The average specimen weighs 2 to 3 kg and is 60 cm to 1 m. The largest specimens are over 1.5 m. Cod usually weigh no more than 30 kg, although a specimen weighing approximately 96 kg and measuring over 180 cm was taken. Cod has a large head, about four times its total length, and a rounded conical snout. at the end of which it usually bears on the lower jaw a filamentous elongated barbillon. Its mouth is large, the upper jaw overflowing and the gill openings wide. Its fins are soft rays it has three dorsal fins and two anal fins, placed behind a whitish belly. It is a generally grey or green fish, but may also be brown or reddish, depending on the habitat to which its colour matches. Scales are small and smooth. The lateral line of the cod is arched on its two-fifths front and decorated with a pale band along its entire length. The tail fin is slightly concave, almost square.
Source : various Internet documents including Wikipedia