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The combined destructive effects of overfishing, habitat destruction, and invasive species, especially alewife (Alosa pseudoharengus) and sea lamprey (Petromyzon marinus) led to the loss of the native top predator lake trout (Salvelinus namaycush) from most of the Great Lakes by 1960. Alewife populations then exploded, creating nuisance die-offs. Public demands for action, coupled with control of sea lamprey, allowed fishery managers to consider stocking Pacific salmon to control alewife and establish a recreational fishery. This effort was successful, reducing alewife numbers and creating a recreational fishery that is estimated at $7 billion annually. This fishery management regime may no longer be viable as new invasive species continue to alter the ecosystem. Fishery managers face an interesting dilemma: whether to manage in the short term for a popular and economically important sport fishery or to embrace ecosystem change and manage primarily for native fish species that appear to be better suited to ongoing ecosystem changes. Such dilemmas occur in great lakes around the world as fishery managers seek to balance economic pressure with changes in their respective ecosystems, often brought about by invasive species.

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Two nations, eight states, the province of Ontario, two U.S. intertribal authorities, and the binational Great Lakes Fishery Commission all play a role in managing the Great Lakes fishery. No overarching institution has the authority to compel cross-border cooperation. Rather, the fishery agencies adhere to A Joint Strategic Plan for Management of Great Lakes Fisheries, a voluntary, multi-jurisdictional agreement signed in 1981. This article provides a brief overview of the roles and responsibilities of the management jurisdictions and describes how the Joint Strategic Plan helps agencies cooperate across jurisdictional boundaries. The plan relies on four strategies-consensus, accountability, information sharing, and ecosystem management-to foster cooperation, and to operationalize collective action on both lake and technical committees. The plan is a model for multi-jurisdictional cooperation in a politically fragmented region.