Walleyes show a fair amount of variation across watersheds. In parts of its range in English-speaking Canada, the walleye is known as a pickerel, though the fish is not related to the true pickerels, which are members of the family Esocidae. However, recent genetic analysis of a preserved (frozen) 'blue walleye' sample suggests that the blue and yellow walleye were simply phenotypes within the same species and do not merit separate taxonomic classification. The walleye is sometimes called the yellow walleye to distinguish it from the blue walleye, which is a color morph that was once found in the southern Ontario and Quebec regions, but is now presumed extinct. It is a North American close relative of the European zander, also known as the pikeperch. The walleye ( Sander vitreus, synonym Stizostedion vitreum), also called the yellow pike or yellow pikeperch or yellow pickerel, is a freshwater perciform fish native to most of Canada and to the Northern United States.
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