The Sauger (Sander canadensis) is a medium-sized freshwater fish similar to the Walleye but distinguished by its spotted dorsal fin and lack of a white tip on the tail. Saugers typicall... The Sauger (Sander canadensis) is a medium-sized freshwater fish similar to the Walleye but distinguished by its spotted dorsal fin and lack of a white tip on the tail. Saugers typically grow up to 18 inches in length and prefer turbid river waters or lakes with sandy bottoms. They are nocturnal predators, feeding primarily on small fish and invertebrates. Saugers are appreciated by anglers for their sporting qualities and are often sought after in colder months.Click here to read more about Sauger.