Large trawlers are specialized vessels for offshore or near-sea fishing operations. Their core purpose revolves around large-scale and high-efficiency marine fishing: They can use the onboard large trawl gear to conduct extensive dragging and fishing operations in the near-sea, far-sea, and even open-ocean areas to capture bottom fish, mid-water fish, crustaceans, and other aquatic resources in large quantities; some of these vessels are equipped with refrigeration, processing, and preservation equipment, allowing them to directly sort, freeze, and process the catch at sea, extending the shelf life, reducing transportation losses, and increasing product value; a few modified large trawlers can also assist in conducting fishery resource surveys, marine environment monitoring, and other public welfare or research auxiliary work, providing data support for the sustainable development of the fishing industry.