Great Lakes passenger steamers had to divest themselves of their marine divisions on the lakes. Under this divestiture law, the "Milwaukee Clipper", for instance, was sold by the Anchor Line along with four other railroad-owned company fleets to the newly formed Great Lakes Transit Corporation. Under this flag, the "Clipper" carried passengers along her old route until retired in 1970. Before trains and, later, cars became prevalent, summer vacation areas in more remote areas around the Great Lakes were accessible primarily only by steamer. Northern Michigan's tourist and resort areas began to grow in this manner in the late 1890s. In the late 19th
Great Lakes during the 1970s and 1980s, combined with successful salmonid stocking programs, have enabled the growth of a large recreational fishery. The last commercial fisherman left Milwaukee in 2011 because of overfishing and anthropogenic changes to the biosphere. Since the 19th century an estimated 160 new species have found their way into the Great Lakes ecosystem; many have become invasive; the overseas ship ballast and ship hull parasitism are causing severe economic and ecological impacts. According to the Inland Seas Education Association, on average a new species enters the Great Lakes every eight months. Introductions into the Great Lakes include the