What order contains cods, hakes, pollocks, and haddocks?

Cods, hakes, pollocks, and haddocks belong to the order Gadiformes.

Gadiformes is a major order of ray-finned fishes whose members are commonly associated with cold or temperate marine environments. Its best-known family is Gadidae, which includes cods, haddocks, and pollocks; hakes occur in several related families within the same order. Grenadiers, burbots, rocklings, and cusk-like fishes are also gadiform relatives.

Many gadiforms share useful anatomical clues, including soft fin rays rather than true spines and, in several familiar species, multiple dorsal and anal fins. Their bodies and feeding structures vary considerably, however, so “cod-like” does not mean every member looks alike. Some live near the seafloor, while others occupy deep water or more open habitats.

The name is based on Gadus, the genus containing the Atlantic cod. Gadiformes should not be confused with Salmoniformes, which includes salmon and trout, or Cypriniformes, which includes carps and minnows. Those are separate orders despite overlapping habitats or culinary importance.