pollock, (Pollachius, or Gadus, virens), North Atlantic fish of the cod family, Gadidae. It is known as saithe, or coalfish, in Europe. The pollock is an elongated fish, deep green with a pale lateral line and a pale belly. It has a small chin barbel and, like the cod, has three dorsal and two anal fins. A carnivorous, lively, usually schooling fish, it grows to about 1.1 m (3.5 feet) in length and 16 kg (35 pounds) in weight. It is caught commercially for food and also affords sport for anglers.
The pollock classified as either Gadus, or Pollachius, pollachius is a related species of no commercial value, found inshore in European waters.