Blue walleye, also known as "Sander vitreus glaucus," is a subspecies of freshwater fish native to the Great Lakes region of North America. There are several synonyms for this fish, including the blue pike, blue pickerel, and blue jack. Despite its name, the blue walleye is not actually a walleye, but rather a distinct subspecies of the sauger. These fish are characterized by their blueish-grey coloration and their elongated bodies, which can grow up to 30 inches in length. Unfortunately, the blue walleye population has dramatically declined over the years due to overfishing and environmental factors. Conservation efforts are underway to help protect these fish and their habitat.