Pelagic fish Atlantic Ocean, the Gulf of Mexico and the Mediterranean Sea. The term highly migratory species (HMS) is a legal term which has its origins in Article 64 of the United Nations Convention on the Law of the Sea (UNCLOS). The highly migratory species include: tuna and tuna-like species (albacore, Atlantic bluefin, bigeye tuna, skipjack, yellowfin, blackfin, little tunny, Pacific bluefin, southern bluefin and bullet), pomfret, marlin, sailfish, swordfish, saury and oceangoing sharks, dolphins and other cetaceans. Essentially, highly migratory species coincide with the larger of the "large pelagic fish", discussed in the previous section, if cetaceans are added and some
USS Skipjack (SSN-585) Atlantic transit. Down in the subsurface calm, the crew were hardly even aware of the turbulence above them. After returning to Norfolk, "Skipjack" conducted several exercises with ASW aircraft flying from air bases in Virginia and North Carolina. In these exercises "Skipjack" played the role of a Russian submarine; ASW forces were to locate, track and conduct simulated attacks against the "Skipjack". During the exercise, "Skipjack" was placed under certain handicaps that would not have been present in normal operations; for instance, she was restricted to a designated operating area measuring 20 miles by 10 miles. Also, at that time,