Having no spines to their fins, the Gadids used, in Cuvierian days, to be associated with the herrings, Salmonids, pike, &c., in the artificially-conceived order of Malacopterygians, or soft-finned bony fishes.
The suborder Anacanthini is, nevertheless, maintained for the Muraenolepididae Gadids and two related families, Macruridae and Muraenolepididae, and may be thus defined: - Air-bladder without open duct.
About 120 species of Gadids are distinguished, mostly marine, many being adapted to life at great depths; all are carnivorous.
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