Figure 1. Maximum likelihood tree of Ckma variation (A and B alleles) among 122 individual Atlantic cod and 10 individuals of four closely related outgroup O taxa, Boreogadus saida Bsa, Gadus chalcogramma Gch, Gadus macrocephalus Gma, and Gadus ogac Gog.

Localities and color codes for Atlantic cod are the waters of Canada (Nova Scotia and Newfoundland) Can, Greenland Gre, Iceland Ice, Norway Nor, Faroe Islands Far, and from the Barents Sea Bar, White Sea Whi, North Sea Nse, Baltic Sea Bal, Celtic Sea Cel, and Irish Sea Iri.