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For fisheries management purpose, Indonesian waters are divided into eleven Fisheries Management Areas (FMA). Three of them located within the IOTC area of competence, namely 571 (Malacca Strait and Andaman Sea), FMA 572 (Western Sumatera and Sunda Strait), and FMA 573 (South of Java to East Nusa Tenggara, Sawu Sea and western part of Timor Sea). Indonesian fishers operate various fishing gears such as Long line, Purse seine, hand line to catch large pelagic fishes such as tuna, skipjack, marlins etc. Longline is the main fishing gear type targeting tunas which operated in those FMAs.
Number of active fishing vessel operated in 2018 was 326 vessels dominated by longline vessels followed by purse seine vessel. Total catch of main species of tunas in 2018 was estimated around 151,592 tons which composed of albacore (5,604 mt), bigeye tuna (20,404 mt), skipjack tuna (85,277 mt) and yellowfin tuna (40,306 mt). Nominal hook rates derived from logbook data 2018 for albacore, bigeye and yellowfin in kg/1000 hooks were 46.96, 33.10, and 65.28 respectively. Meanwhile, nominal hook rates for swordfish and blue marlin were increased compared than previous years, while hook rates for black marlin, striped marlin, indo-pacific sailfish and short-billed spearfish continued to depleted. Observer coverage 2018 was reported 3.85% decreased from previous year in term proportion number of vessel observed. Interaction longline fishery with ERS still dominated by blue sharks. Interaction with seabird reported decreased due to shifting fishing area while interaction with marine turtle reported slightly increased from previous years, however mitigation measures for those ERS has taken in account by fishermen.
