I want to know the answer to the following question:
Of what did Tuvalu agree to the extension ?
All the background I'm provided with is that "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) to confirm access to the fisheries in the Western and Central Pacific for US tuna boats for 18 months.". Is that enough to answer the question?
Answer: yes