Tuvalu participates in the operations of the Pacific Island Forum Fisheries Agency (FFA) and the Western and Central Pacific Fisheries Commission (WCPFC). The Tuvaluan government, the US government, and the governments of other Pacific islands, are parties to the South Pacific Tuna Treaty (SPTT), entered into force in 1988. The current SPTT agreement expires on 14 June 2013. Tuvalu is one of the eight signatories of the Nauru Agreement Concerning Cooperation in the Management of Fisheries of Common Interest (Nauru Agreement) which collectively controls 25–30% of the world's tuna supply and approximately 60% of the western and central Pacific tuna supply [https://web.archive.org/web/20110819123129/http://klima-tuvalu.no/2011/04/13/pacific-islands-fighting-for-their-tuna/]. In May 2013 representatives from the United States and the Pacific Islands countries agreed to sign interim arrangement documents to extend the Multilateral Fisheries Treaty (which encompasses the South Pacific Tuna Treaty and Nauru Agreement) to confirm access to the fisheries in the Western and Central Pacific for US tuna boats for 18 months.