Becker, George C. / Fishes of Wisconsin
Cod family - gadidae, pp. 745-751 ff. PDF (2.7 MB)
Cod Family- Gadidae Only one species, the burbot, appears in Wisconsin. It is a truly fresh- water form and is circumpolar in distribution. The family Gadidae is represented by 25 species in the United States and Canada, 23 of which inhabit the Atlantic and Pacific oceans. This is the well-known marine family which contains the cod, the haddock, and many other important food species. The cods have large heads and wide gill openings. Their jaws are ter- minal or nearly so, and both jaws and vomer are equipped with numer- ous small teeth in wide bands; there is a small barbel at the tip of the chin. The scales are small and cycloid. All the fins are soft rayed, and the pelvic fins are set far forward. In the burbot, the pelvic fins are in the throat region and are anterior to the pectoral fins; this is the only Wisconsin species with the pelvic fins positioned in front of the pector- als. In the cods, the caudal vertebrae become smaller posteriorly, and the pneumatic duct from the swimbladder to the pharynx is lost (phy- soclist). 745
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