The Technical Consultative Meeting on Regional Plan of Action (RPOA) of Trans-boundary Species: Indo-Pacific Mackerel in Gulf of Thailand was held in Jomtien, Chonburi province, Thailand from 12th- 13th 2019 and supported by SEAFDEC-Sweden Project. The Meeting was attended by nearly 40 representatives from the South China Sea and Gulf of Thailand countries namely: Cambodia, Malaysia, Indonesia, Philippines, Thailand and Viet Nam as well as representatives from FAO/RAF, Fisheries Refugia Project, SEAFDEC Secretariat, TD, and MFRDMD.