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As part of the government's efforts to tackle Illegal, Unreported, Unregulated (IUU) fishing by irresponsible operators, the government issued a Ministerial Regulation (PERMEN KP 57/2014) concerning the prohibition of transhipment in Indonesia. In 2020, the government again changed the policy of transhipment with Ministerial Regulation concerning Capture Fishery Business (PERMEN KP 58/2020), which explained that it was allowed to carry out transhipment again. By being allowed to reload on tuna longline vessels, monitoring is needed to prevent unreported fishing. This study aims to analyze the movement of ships in transhipment with a Vessel Monitoring System (VMS), analyze indications of IUU fishing violations committed by transhipment vessels, and estimate transhipment activities that occur on tuna longline vessels based on catch composition data. The method used in this research is the descriptive method. The results showed that the flow of tuna longline vessels during transhipment can be identified from the VMS tracking data, which is marked by only two-speed patterns from the ship, namely shipsthat only have speed patterns above 5 knots and below 2 knots. There are indications of violations of IUU fishing carried out by ships during transhipment in the form of unreported fishing, and transhipment activities account for 97% of the total catches of tuna longline vessels based at Nizam Zachman Jakarta Oceanic Fishing Port.
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