Sei whale definition, a rorqual, Balaenoptera borealis, inhabiting all seas: now greatly reduced in number. A 1991 study in the North Atlantic estimated only 4,000. Sei whales don’t gulp-feed like the other whales in their family. There was a pronounced increase in the killing of sei whales during the 1950s and '60s because of the decline of blue and fin whales. It is well known that overexploitation by the whaling industry led to serious declines in many of the world’s populations of whales, although thankfully no species was brought to extinction and many are now in the process of recovering, although not all. The flippers are relatively small and pointed on the tips; the flukes are small for its body size. The other rorquals are: blue, fin, Bryde's and minke. They usually surface at a shallower angle than Bryde's or fin whales, and the head rarely emerges at a steep angle unless the whale is being hunted. Save the Whales is a 501(c)(3) organization, founded in 1977. Presumably this activity is caused by opportunistic feeding of abundant prey, but it is unknown as to why other whales do not demonstrate similar behavior. First was the completion of the development of a site-based conservation approach for sei whales at Berkley Sound, Falkland Islands. The bodies of sei whales range in colouring from murky blues to steely greys to deep browns. Their skin is often covered in scars that become apparent after healing from being attacked or injured. The take of these animals peaked in the 1964-65 season, when 25,454 of these whales were killed. Growing up to 19.5 metres long, female sei whales are the larger of the two sexes, eclipsing their male counterparts by over 2 metres. A study by whale expert Phil Clapham in the Gulf of Maine revealed that until 1986, only one sei had been present in the Massachusetts Bay Region for more than ten years. See more. Sei whales inhabit all oceans and adjoining seas except in tropical and polar regions. A marker was inserted in a sei in the Antarctic and the whale was killed ten days later. Blue whale. Sei Whale Balaenoptera borealis. A world where every whale and dolphin is safe and free. Severely depleted by commercial hunting, populations of sei whale populations are still vulnerable, facing danger from noise and chemical pollution, vessel strikes, global warming, sonar and entanglement in fishing gear. No… The total population of sei whales in all U.S. waters is unknown. They have been sighted in the Pacific, the North Atlantic, the Southern Ocean, and off South Africa, Australia and Brazil. Sei whales are pretty adaptable. The sei is a baleen whale and they are usually divided into three families. It is usually pronounced "say," although some use the pronunciation "sigh.". To do this, it would have had to travel at an average sustained speed of almost ten knots. Sei whale (Atlantic population) Scientific name Balaenoptera borealis Status Data Deficient Reason for designation This species is seen off Nova Scotia and Newfoundland. Registered 501(c)(3) nonprofit organization, Saving the endangered North Atlantic right whale, Meet Delilah – Our Inflatable North Atlantic Right Whale, Sharing the Seas – Safe Boating for Sailors. Usually seen in small groups, numbers of sei whales will often increase when food sources are plentiful. It is estimated that individual whales have lived up to 74 years. Scientists say this is the only population of blue whales to have rebounded from the ravages of whaling. They are found in nearly all of the world’s waters from the sub-Arctic and sub-Antarctic, apart from the Mediterranean and Baltic seas. Surveys in the Denmark Strait found 1,290 whales in 1987, and 1,590 whales in 1989. 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