Fisheries are managed for a range of objectives, encompassing biological, economic, social and political goals (Hilborn, 2007b). Harvests can be controlled by many methods, broadly grouped as either input or output (catch) controls (Beddington et al., 2007). Output controls directly limit the amount of fish which can be taken from the water each period with a Total Allowable Catch (TAC). Input controls indirectly control the catch through restrictions on fishing, such as limits on the number of licences, capacity of boats, and gear restrictions.