These are very small codfishes allied to Gadus, but with the 

 vent placed before the second dorsal and with a different structure 

 of the cranium. 



There are 2 species. 



The first of these is the common tomcod, M. tomcod, which 

 is found on our Atlantic Coast from Virginia to Cape Sable. It 

 may be distinguished by the possession of 21 or 22 rays in the 

 dorsal fin. 



Though usually known as the tomcod, it is in many places 

 called the frostfish because it is most abundant in early winter 



when it approaches the shores and even ascends rivers and creeks 

 for spawning purposes. It has been taken in the Kennebec River 

 60 miles from its mouth and far above the reach of the tide. When 

 ascending rivers they are taken in large numbers with dip-nets and 

 with hook and line at bridges and wharves. 



Though most abundant in winter they may be found along 

 the shore at all seasons. 



In form the tomcod is a miniature cod, and there is difficulty 

 in distinguishing the young of the 2 species. The tomcod rarely 

 exceeds a foot in length, feeds upon crustaceans, mollusks and 

 small fishes, and is esteemed in many localities as a delicacy. 



