Management of the fishery is by consensus of all management agencies with an interest in the resource and work under the mandate of the Great Lakes Fishery Commission. The commission makes assessments using sophisticated mathematical modeling systems. The commission has been the focus of considerable recrimination, primarily from angler and charter fishing groups in the U.S. which have had a historical antipathy to commercial fishing interests. This conflict is complex, dating from the 1960s and earlier, with the result in the United States that, in 2011, commercial fishing was mostly eliminated from Great Lakes states. One report suggests that battling between diverse fishing interests began around Lake Michigan and evolved to cover the entire Great Lakes region. The analysis suggests that in the Lake Erie context, the competition between sport and commercial fishing involves universals and that these conflicts are cultural, not scientific, and therefore not resolvable by reference to ecological data.