Supply management is a critical component in hand line fishing vessel operations lasting 10–20 days at sea, as it directly affects operational cost efficiency and catch quality. This study aimed to identify and analyze the supply management system of hand line vessels at Bungus Oceanic Fishing Port, covering procurement, storage, maintenance, and control stages, as well as identifying the main constraints faced by fishers. A descriptive method with a qualitative approach was employed through observation and purposive interviews involving captains, crew members, vessel owners, port officers, and logistics suppliers from October to December 2023. The results indicate that the supply management system has been relatively well-structured; procurement is based on estimated trip duration and crew size with an average cost of IDR 25–30 million per trip for 24–30 GT vessels, storage is organized by categorizing wet, dry, and high-demand goods, maintenance includes ice protection, freshwater monitoring, and controlled daily consumption, while control mechanisms involve daily recording, usage limitation of high-demand items, and post-trip evaluation of remaining supplies. The main challenges include limited storage space on smaller vessels and the absence of standardized supply requirements based on vessel tonnage and trip duration. Overall, the supply management system is considered adequate but remains experience-based, highlighting the need for standardized supply guidelines and a more systematic logistics recording system to improve efficiency and planning accuracy.