IATTC Convention 2003 (Antigua Convention): Convention for the Strengthening of the Inter-American Tropical Tuna Commission Established by the 1949 Convention Between the United States of America and the Republic of Costa Rica

The original Convention for the Establishment of an Inter-American Tropical Tuna Commission (IATTC Convention) was originally signed by the USA and Costa Rica in 1949. At the time of writing in 2026, the number of IATTC members has grown to 17 (16 states plus the European Union), and the original Convention has been updated and strengthened through the 2003 Antigua Convention. The IATTC Secretariat is based in La Jolla, California, USA. The IATTC is responsible for the conservation of tunas and tuna-like species in the tropical eastern Pacific Ocean in a region defined in the Antigua Convention. In the west, this geographical remit overlaps with that of the Western and Central Pacific Fisheries Commission (WCPFC). Like other RFMOs, IATTC keeps a register of authorised fishing vessels targeting these species in the eastern tropical Pacific Ocean, decides and implements fisheries management measures to ensure their long-term sustainability, and monitors compliance with those measures.