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
HMS Skipjack (1889) 26 June 1897 "Skipjack" was present at the Jubilee Fleet Review at Spithead, In 1898 "Skipjack" was sent to Palmers of Jarrow for refit. "Skipjack" had her locomotive boilers replaced by Reed water-tube boilers in early 1900, which increased power and reliability. "Skipjack"s new machinery delivered over giving a speed of . "Skipjack" took part in the Royal Navy's annual manoeuvres in July–August 1900, and again in 1901. In January 1901 she was a tender to the cruiser in Kingstown. In 1905 "Skipjack" was in reserve, but after refit, she returned to active service as part of the Fishery Protection