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Cetaceans are aquatic mammals constituting the infraorder Cetacea. There are around 89 living species, which are divided into two parvorders. The first is the Odontoceti, the toothed whales, which consist of around 70 species, including the dolphin, porpoise, beluga whale, narwhal, sperm whale, and beaked whale. The second is the Mysticeti, the baleen whales, which have a filter-feeder system, and consist of fifteen species divided into three families, and include the blue whale, right whale, bowhead whale, rorqual, and gray whale.
Whaling is the hunting of whales for their usable products such as meat and blubber, which can be turned into a type of oil which became increasingly important in the Industrial Revolution. It was practiced as an organized industry as early as 875 AD. By the 16th century, it had risen to be the principal industry in the coastal regions of Spain and France. The industry spread throughout the world, and became increasingly profitable in terms of trade and resources. Some regions of the world's oceans, along the animals' migration routes, had a particularly dense whale population, and became the targets for large concentrations of whaling ships, and the industry continued to grow well into the 20th century. The depletion of some whale species to near extinction led to the banning of whaling in many countries by 1969, and to a worldwide cessation of whaling as an industry in the late 1980s.
Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. They are an informal grouping within the infraorder Cetacea, usually excluding dolphins and porpoises. Whales, dolphins and porpoises belong to the order Cetartiodactyla, which consists of even-toed ungulates. Their closest living relatives are the hippopotamuses, having diverged about 40 million years ago. The two parvorders of whales, baleen whales (Mysticeti) and toothed whales (Odontoceti), are thought to have split apart around 34 million years ago. Whales consist of eight extant families: Balaenopteridae, Balaenidae, Cetotheriidae, Eschrichtiidae, Monodontidae, Physeteridae, Kogiidae, and Ziphiidae.
A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a bright light or intense heat without an explosion. Flares are used for distress signaling, illumination, or defensive countermeasures in civilian and military applications. Flares may be ground pyrotechnics, projectile pyrotechnics, or parachute-suspended to provide maximum illumination time over a large area. Projectile pyrotechnics may be dropped from aircraft, fired from rocket or artillery, or deployed by flare guns or handheld percussive tubes.
The narwhal, or narwhale, is a medium-sized toothed whale that possesses a large "tusk" from a protruding canine tooth. It lives year-round in the Arctic waters around Greenland, Canada, and Russia. It is one of two living species of whale in the family Monodontidae, along with the beluga whale. The narwhal males are distinguished by a long, straight, helical tusk, which is an elongated upper left canine. The narwhal was one of many species described by Carl Linnaeus in his publication Systema Naturae in 1758.
The Bering Sea is a marginal sea of the Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasses on Earth: Eurasia and The Americas. It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental shelves.
Baleen whales, also known as whalebone whales, form a parvorder of the infraorder Cetacea. They are a widely distributed and diverse parvorder of carnivorous marine mammals. Mysticeti comprise the families Balaenidae, Balaenopteridae (rorquals), Cetotheriidae, and Eschrichtiidae. There are currently 15 species of baleen whales. While cetaceans were historically thought to have descended from mesonychids,, molecular evidence supports them as a clade of even-toed ungulates (Artiodactyla). Baleen whales split from toothed whales (Odontoceti) around 34 million years ago.
The common minke whale or northern minke whale is a species of minke whale within the suborder of baleen whales.
Whale watching is the practice of observing whales and dolphins (cetaceans) in their natural habitat. Whale watching is mostly a recreational activity, but it can also serve scientific and/or educational purposes. A study prepared for International Fund for Animal Welfare in 2009 estimated that 13 million people went whale watching globally in 2008. Whale watching generates $2.1 billion per annum in tourism revenue worldwide, employing around 13,000 workers. The size and rapid growth of the industry has led to complex and continuing debates with the whaling industry about the best use of whales as a natural resource.
Cetacean surfacing behaviour or breaching is a group of behaviours demonstrated by the Cetacea infraorder when they come to the water's surface to breathe. Time intervals between surfacing can vary depending on the species, surfacing style or the purpose of the dive, and some species have been known to dive for up to 85 minutes at a time when hunting. In addition to respiration, cetaceans have developed and used surface behaviours for many other functions such as display, feeding and communication. All regularly observed members of the order Cetacea, including whales, dolphins and porpoises, show a range of surfacing behaviours. Cetacea is usually split into two suborders, Odontoceti and Mysticeti, based on the presence of teeth or baleen plates in adults respectively. However, when considering behaviour, Cetacea can be split into whales and dolphins and porpoises as many behaviours are correlated with size. Although some behaviours such as spyhopping, logging and lobtailing occur in both groups, others such as bow riding or peduncle throws are exclusive to one or the other. It is these energetic behaviours that humans observe most frequently, which has resulted in a large amount of scientific literature on the subject and a popular tourism industry.
Indigenous whaling is the hunting of whales by indigenous peoples. It is permitted under international regulation, but in some countries remains a contentious issue. It is usually considered part of the subsistence economy. In some places whaling has been superseded by whale watching instead. This article deals with communities that continue to hunt; details about communities that have ended the practice may be found at History of whaling.
A ranged weapon is any weapon that can engage targets beyond hand-to-hand distance, i.e. at distances greater than the physical reach of the weapon itself. It is sometimes also called projectile weapon or missile weapon because it typically works by launching projectiles, though technically a directed-energy weapon is also a ranged weapon. In contrast, a weapon intended to be used in hand-to-hand combat is called a melee weapon.
Replenishment at sea (RAS) or underway replenishment (UNREP) is a method of transferring fuel, munitions, and stores from one ship to another while under way. First developed in the early 20th century it was used extensively by the United States Navy as a logistics support technique in the Pacific theatre of World War II, permitting US carrier task forces to remain at sea indefinitely.
USNS Relentless (T-AGOS-18) was a Stalwart-class modified tactical auxiliary general ocean surveillance ship in service in the United States Navy from 1990 to 1993. Since 1998, she has been in commission in the National Oceanic and Atmospheric Administration (NOAA) fleet as the fisheries research ship NOAAS Gordon Gunter.
Line-throwing guns, most often referred to as Lyle Guns after their inventor David A. Lyle, were used from the late 19th century to 1952, when they were replaced by rockets for throwing lines.
A potato cannon is a pipe-based cannon which uses air pressure (pneumatic), or combustion of a flammable gas, to launch projectiles at high speeds. They are built to fire chunks of potato, as a hobby, or to fire other sorts of projectiles, for practical use. Projectiles or failing guns can be dangerous and result in life-threatening injuries, including cranial fractures, enucleation, and blindness if a person is hit.
Whale watching is a popular pastime in Sydney in the winter and spring. There are a number of different migration and whale seasons.
A harpoon cannon is a whaling implement developed in the late 19th century and most used in the 20th century. It would be mounted on the bow of a whale catcher, where it could be easily aimed with a wide field of view at the target. Powered by black powder and later, smokeless powder, it would generally fire a large steel harpoon, either solid steel or fitted with an exploding black powder, or later, penthrite (PETN) grenade.
A Jackstay is a cable or bar between two points to support and guide a load between those points, or as an anchor to attach something to be constrained along that line. The term is mostly used in a marine context and originated on sailing ships. Note the use of "stay" implies load bearing working rigging. In diving it is also a line to guide the movements of a diver between the endpoints.
Russian whaling has been conducted by native peoples in the Chukotka region of Russia since at least 4,000 years ago by native Yupik and Chukchi people, but commercial whaling did not begin until the mid-19th century, when companies based in Finland sent out vessels to the Pacific. It was not until 1932 that modern pelagic whaling began to take off with the purchase of an American cargo ship which was renamed the Aleut, which was the only Soviet factory ship until World War II. After the war, with the need for a stronger Soviet economy and rapid industrialization of the country during the 1940s and 1950s, Soviet whaling took off and became a truly global industry. The first Soviet whalers reached the Antarctic during the 1946–47 season with the factory ship Slava and then underwent a rapid expansion during the late 1950s in which 5 new fleets were added within a 4-year span: Sovetskaya Ukraina in 1959, Yuriy Dolgorukiy in 1960, and Sovetskaya Rossiya in 1961 for the Antarctic, and finally two large fleets in 1963 for the North Pacific. Thus, by the early 1960s Soviet whaling had truly become a global industry, operating in every ocean except the North Atlantic and undertaking voyages that could last as long as seven months each. From 1964 to 1973, the Soviet Union was considered by some the biggest whaling nation in the world.
References
- ↑ Arnor Jensen, Basile Bonnemaire, Sveinung Løset, Kåre G. Breivik, Karl U. Evers, Ola Ravndal, Vegard Aksnes, Trine Lundamo, Christian Lønøy, "First ice model testing of the arctic tandem offloading terminal", section 4.1, 19th IAHR International Symposium on Ice, Vancouver, 6–11 July 2008.
- ↑ KL Laidre, MP Heide-Jørgensen, "Role of the bowhead whale as a predator in West Greenland", Marine Ecology Progress Series, vol. 346, p. 285-297, 27 September 2007.
- ↑ M. P. Heide-jørgensen, E. S. Nordøy, N. Øien, L. P. Folkow, L. Kleivane, A. S. Blix, M. V. Jensen, K. L. Laidre, "Satellite tracking of minke whales (Balaenoptera acutorostrata) off the coast of northern Norway", Journal of Cetacean Research and Management, pp. 175-178, vol. 3, iss. 2, 2001.
- ↑ Hector M. Guzman, Catalina G. Gomez, Carlos A. Guevara, Lars Kleivane, "Potential vessel collisions with Southern Hemisphere humpback whales wintering off Pacific Panama", Marine Mammal Science, 12 September 2012.