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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 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 Andaman 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 2019 were 383 vessels dominated by longline vessel followed by purse seine vessel. Total catch of main species of tunas in 2019 was estimated around 189,021 tons which composed of albacore (3,921 mt), bigeye tuna (13,654 mt), skipjack tuna (128,939 mt) and yellowfin tuna (42,507 mt).
Nominal hook rates derived from logbook data 2019 for albacore, bigeye and yellowfin in kg/1000 hooks were 33.47, 18.85, and 52.22 respectively. Meanwhile, nominal hook rates for swordfish, indo-pacific sailfish and black marlin were increased compared than previous years, while hook rates for blue marlin, striped marlin, and short-billed spearfish continued to depleted. Observer coverage 2019 in longline vessel was reported 3.53% 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 slightly increased from previous year involving petrels while interaction with marine turtle reported decreased from previous years and mitigation measures for those ERS has taken in account by fishermen.
