They are so-called blue water fish, and they live in the ocean far from the coast most of the time. They will also be highly migratory, and they can roam hundreds or even thousands of miles along the warm current in the ocean. The marlin (marlin) likes places with high water temperature, feeds on mackerel and tuna, and also goes deep diving to eat squid. They are the fastest fish in the ocean, and will use their spears to devour the frightened and injured victims in dense groups. They are famous for being able to lift the huge targets hooked by them. This rare sea monster is the holy grail of sports-loving fishermen. People regard their meat as a delicacy, especially in Japan, and they are often used as raw materials for sashimi. Although they are not endangered at present, conservationists worry that they are being caught irresistibly, especially in the Atlantic Ocean.