This whale is one of the least studied of the large whales. Scientific Name: Balaenoptera borealis Length: 45-66 feet Weight: About 20 tons Reaching speeds up to 34.5 miles per hour makes the Sei Whale the fast whale in the water. Although they are massive, sei whales are one of the fastest sea mammals and can reach speeds of 50 km/h (31 mph) (27 knots) over short distances. The name came from seje , the Norwegian word for pollock, a type of fish because sei whales and pollock often appeared off Norway's coast at the same time. They prefer subtropical to subpolar waters and can be found in all oceans and adjoining seas, except for those in tropical and polar regions. They are streamlined animals with dark backs and white undersides and curved dorsal fins. Lesson, 1828 - Sei whale Distinctive Characteristics Sei whales can be confused with fin and Bryde's whales, both of which also have a prominent falcate dorsal fin.All 3 have typical rorqual body shapes. They are streamlined, with a dark back and white underside and very curved dorsal fin. Scientific name: Balaenoptera borealis. Overall there are around 90 different species of cetacea (whales, dolphins and porpoises) currently living in our ocean. In both sei and Bryde's whales, the dorsal fin rises at a steep angle from the back. Scientific name: Balaenoptera borealis Faroese: Seihvalur Greenlandic: Tikaagulliusaarnaq Icelandic: Sandreyður Norwegian: Seihval Danish: Sejhval English: Sei whale There are two recognised sub-species of the sei whale. Sei (pronounced "say") whales are one of the fastest whale species. Its taxonomy is currently being disputed, with some It inhabits most oceans and adjoining seas, and prefers deep offshore waters. The Sei Whale is not as well known as other rorquals, despite the fact that is favours the surface of the water (as opposed to diving deep beneath its … While Sei whales are often pictured as uniformly coloured, they often have very subtle, beautiful swirling markings on their skin. Sei Whale (Balaenoptera borealis) Sei (pronounced "say") whales are among the fastest whale species. The sei whale (/ ˈ s eɪ /, Balaenoptera borealis) is a baleen whale, the third-largest rorqual after the blue whale and the fin whale. The northern: B. borealis borealis and the southern: B. b. schlegellii. Sei whales appeared off the coast of Norway at the same time each year as the pollock that came to feed on the abundant plankton. The “Sei” in “Sei Whale” comes … Scientific Name: Balaenoptera borealis Common Name: Sei whale Species synopsis: The sei whale is the third largest species of baleen whale after the blue and fin whale. Their name comes from the Norwegian word for pollock—seje—because sei whales and pollock often appeared off the coast of Norway at the same time. Common Name: Sei Whale Scientific Name: Balaenoptera borealis Length as an adult: An adult male sei whale measures about 45 to 55 feet (13.7 to 16.8 meters), sometimes reaching a length of 65 feet (19.8 meters). The name “sei whale” comes from the Norwegian word “sei”, meaning pollock/coalfish. Weight as an Adult: An adult male sei whale weights about 14 to 17 tons (34,000 pounds). The sei whale is the third largest baleen whale after the blue whale and fin whale. Sei Whales are the 4 th largest rorqual (the largest group of baleen whales) after the Blue Whale, the Fin Whale, and the Humpback Whale. Physical description. The largest sei whales can grow up to 19.5 m (64 ft) long and weighing as much as 28 tonnes (31 short tons). It avoids polar and tropical waters and semienclosed bodies of water. 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