The Walleye (Sander vitreus) is a freshwater perciform fish native to Canada and the Northern United States. Walleyes can grow up to 31 inches and are recognized by their olive-green co... The Walleye (Sander vitreus) is a freshwater perciform fish native to Canada and the Northern United States. Walleyes can grow up to 31 inches and are recognized by their olive-green color, large, glassy eyes, and sharp teeth. They prefer deep, cool waters with a moderate current, feeding primarily at dawn and dusk on smaller fish. Walleyes are highly prized by anglers for their elusive nature and excellent taste.Click here to read more about Walleye.