The walleye (sander vitreus, synonym stizostedion vitreum), also called the yellow pike or yellow pickerel, is a freshwater perciform fish native to most of canada and to the northern united states. it is a north american close relative of the european zander, also known as the pikeperch. the walleye is sometimes called the yellow walleye to distinguish it from the blue walleye, which is a subspecies that was once found in the southern ontario and quebec regions, but is now presumed extinct. 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 taxo...

Source: Wikipedia