Two subspecies have been identified-the northern sei whale ( B.
Little is known about when members of the various families in the Mysticeti, including the Balaenopteridae, diverged from each other. Balaenopterids diverged from the other families of suborder Mysticeti, also called the whalebone whales, as long ago as the middle Miocene.
#SUMMER LESSON VR WIKIPEDIA SERIES#
Rorquals take their name from the Norwegian word røyrkval, meaning "furrow whale", because family members have a series of longitudinal pleats or grooves on the anterior half of their ventral surface. Sei whales are rorquals (family Balaenopteridae), baleen whales that include the humpback whale, the blue whale, Bryde's whale, the fin whale, and the minke whale. Guldberg first identified the "sejhval" of Finnmark with B. In 1865, the British zoologist William Henry Flower named a 45-ft specimen that had been obtained from Pekalongan, on the north coast of Java, Sibbaldius (= Balaenoptera) schlegelii-in 1946 the Russian scientist A.G. In 1846, the English zoologist John Edward Gray, ignoring Lesson's designation, named Rudolphi's specimen Balaenoptera laticeps, which others followed. In 1828, Rene Lesson translated this term into Balaenoptera borealis, basing his designation partly on Cuvier's description of Rudolphi's specimen and partly on a 54-ft female that had stranded on the coast of France the previous year (this was later identified as a juvenile fin whale, Balaenoptera physalus). In 1823, the French naturalist Georges Cuvier described and figured Rudolphi's specimen under the name "rorqual du Nord". The Swedish-born German naturalist Karl Rudolphi initially identified it as Balaena rostrata (= Balaenoptera acutorostrata). On 21 February 1819, a 32-ft whale stranded near Grömitz, in Schleswig-Holstein. The American naturalist Roy Chapman Andrews compared the sei whale to the cheetah, because it can swim at great speeds "for a few hundred yards", but it "soon tires if the chase is long" and "does not have the strength and staying power of its larger relatives". It has also been referred to as the lesser fin whale because it somewhat resembles the fin whale. Now the term only applies to the latter species. Later, as modern whaling shifted to Sanriku-where both species occur-it was confused for the sei whale. In Japanese, the whale was called iwashi kujira, or sardine whale, a name originally applied to Bryde's whales by early Japanese whalers. In the Pacific, the whale has been called the Japan finner "finner" was a common term used to refer to rorquals. The specific name is the Latin word borealis, meaning northern. Sei whales appeared off the coast of Norway at the same time as the pollock, both coming to feed on the abundant plankton. Sei is the Norwegian word for pollock, also referred to as coalfish, a close relative of codfish. As of 2008, its worldwide population was about 80,000, less than a third of its prewhaling population. įollowing large-scale commercial whaling during the late 19th and 20th centuries, when over 255,000 whales were killed, the sei whale is now internationally protected.
The whale's name comes from the Norwegian word for pollock, a fish that appears off the coast of Norway at the same time of the year as the sei whale. It is among the fastest of all cetaceans, and can reach speeds of up to 50 km/h (31 mph) (27 knots) over short distances. Reaching 19.5 m (64 ft) in length and weighing as much as 28 t (28 long tons 31 short tons), the sei whale consumes an average of 900 kg (2,000 lb) of food every day its diet consists primarily of copepods, krill, and other zooplankton. The sei whale migrates annually from cool, subpolar waters in summer to temperate, subtropical waters in winter with a lifespan of 70 years. It avoids polar and tropical waters and semi-enclosed bodies of water. It inhabits most oceans and adjoining seas, and prefers deep offshore waters. The sei whale ( / s eɪ/ SAY, Norwegian: Balaenoptera borealis) is a baleen whale, the third-largest rorqual after the blue whale and the fin whale.
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