Walleye is widely regarded as the best-tasting freshwater fish. The largest member of the perch family, it is native to lakes and streams throughout Canada and the north-central United States. However, Canada is the only commercial source of walleye, as commercial fishing and sales are banned in the United States to protect recreational fisheries. Named for its highly reflective, cat-like eyes, the walleye can reach a length of 30 inches and weight of 15 pounds, though typical market size is 1 to 5 pounds. Wildly popular with sport fishermen and increasingly popular on restaurant menus, walleye has come into increased demand, fueling research into its potential for aquaculture. To date, the species has proven difficult to farm, with mortality rates and production costs prohibitively high, so farming serves only to stock lakes for anglers. Most restaurant and retail supplies of walleye come from Lake Erie, Lake Winnipeg, Lake of the Woods and other large Canadian lakes. Although fresh and frozen walleye is available year-round, peak fresh supplies are in fall and winter.