For fisheries management purposes, Indonesian waters are divided into eleven Fisheries Management Areas (FMA). Three of them are located within the IOTC area of competence, namely FMA 572 (Western Sumatera and Sunda Strait), FMA 573 (South of Java to East Nusa Tenggara, Sawu Sea and western part of Timor Sea), and 571 (Malacca Strait and the Andaman Sea). Indonesian fishers operate various fishing gears such as longline, purse seine, handline, and gillnet to catch large pelagic fishes like tuna, skipjack, marlins, etc. Longline is the primary fishing gear type targeting tunas that operate in those FMAs. The total catch of the main species of tunas in 2020 was estimated at around 205,582 tons1 which are composed of yellowfin tuna (44,471 tons), bigeye tuna (21,556 tons), skipjack tuna (134,455 tons), and albacore (5,099 tons). Landing ports, both artisanal and industrial, are still consistently monitored through various projects and scientific observer programs conducted altogether by the Research Institute for Tuna Fisheries (RITF) and Directorate General of Capture Fisheries (DGCF).