Gadiformes

Gadiformes /ˈɡædɪfɔːrmiːz/, also called the Anacanthini, are an order of ray-finned fish that include the cod, hakes, pollock, haddock, burbot, rocklings and moras, many of which are food fish of major commercial value. They are mostly marine fish found throughout the world and the vast majority are found in temperate or colder regions (tropical species are typically deep-water) while a few species may enter brackish estuaries. Pacific tomcods, one of the two species that makes up the genus Microgadus, are able to enter freshwater, but there is no evidence that they breed there. Some populations of landlocked Atlantic tomcod on the other hand, complete their entire life cycle in freshwater. Yet only one species, the burbot (Lota lota), is a true freshwater fish.[2]

Gadiformes
Gadus morhua
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Superorder:	Paracanthopterygii
Order:	Gadiformes Goodrich, 1909
Type species
Gadus morhua Linnaeus 1758
Families
Bregmacerotidae Gill, 1872 Euclichthyidae Cohen, 1984 Gadidae Rafinesque, 1810 Lotidae Bonaparte, 1832 Macrouridae Bonaparte, 1831 [1] Melanonidae Goode & Bean, 1896 Merlucciidae Gill, 1884 Moridae Moreau, 1881 Muraenolepididae Regan, 1903 Phycidae Swainson, 1838

Common characteristics include the positioning of the pelvic fins (if present), below or in front of the pectoral fins. Gadiformes are physoclists, which means their swim bladders do not have a pneumatic duct. The fins are spineless. Gadiform fish range in size from the codlets, which may be as small as 7 cm (2.8 in) in adult length, to the Atlantic cod, Gadus morhua, which reaches up to 2 m (6.6 ft).[3]