Blue walleye
(重定向自Blue pike)



The blue walleye (Sander vitreus glaucus), also called the blue pike, is a subspecies of the walleye that has been critically endangered in the Great Lakes since the 1980s. Until the middle of the 20th century, it was a commercially valuable fish, with about a half million tonnes being landed from about 1880 to the late 1950s, when the populations collapsed.