1 | pages = 58–62] or one year,cite journal | author = Risting, S | year = 1928 |title = Whales and whale foetuses | journal = Rapp. Whaling in the southern oceans originally targeted Humpback Whales. The whale's preference for zooplankton has been determined from stomach analyses and direct observations of feeding behaviour.cite journal | author = Watkins, W.A.|coauthors = W.E. Commn | volume = 42 | pages = 697–700 ] There is no direct evidence of illegal whaling in the North Pacific, although the acknowledged misreporting of whaling data by the Soviet Unioncite journal | author = Yablokov, A.V. By the end of the period of exploitation (1974), the numbers of Sei Whales in the North Pacific had been reduced to between 7,260 and 12,620 whales.In the Southern Hemisphere, Sei Whale abundance estimates range between 9,800 and 12,000 whales, based upon the history of catches and CPUE in the southern oceans. Carretta, D.P. Commerce, NOAA Technical Memo NMFS-SWFSC-211 | url= http://swfsc.noaa.gov/publications/TM/SWFSC/NOAA-TM-NMFS-SWFSC-211.PDF | format = PDF] and there were no confirmed sightings off Oregon and Washington. and T. Gerrodette | year = 1994 | title = Report of cetacean sightings during a marine mammal survey in the eastern Pacific Ocean and the Gulf of California aboard the NOAA ships "MacArthur" and "David Starr Jordan" July 28 - November 6, 1993 | publisher = U.S. Dept. of Washington Press | location = Seattle, WA ] The Sei Whale was given complete protection from commercial whaling in the North Pacific in 1976, and quotas on Sei Whales were introduced in the North Atlantic in 1977. Commerce, NOAA Technical Memo NMFS-SWFSC-169 |url=http://swfsc.noaa.gov/publications/TM/SWFSC/NOAA-TM-NMFS-SWFSC-169.PDF | format=PDF] cite paper | author = Carretta, J.V. Shelf Res. Lab. Most calls lasted about a half second, and occurred in the 240–625 hertz frequency, well within the normal range of sounds that most humans can hear. The catch peaked in 1964 at over 20,000 Sei Whales, but by 1976, this number had dropped to below 2,000 and commercial whaling for the species ended in 1977.International protectionThe Sei Whale did not have meaningful protection at the international level until 1970, when catch quotas for the North Pacific began to be set on a species basis by the International Whaling Commission (IWC). | year = 2002 | title = Relevance of JARPN II to management, and a note on scientific standards. | volume = 7 | pages = 107–114 | doi = 10.1016/0278-4343(87)90073-2] In the North Pacific, the Sei Whale is found from 20°N–23°N latitude in the winter, and from 35°N–50°N latitude in the summer.cite journal | author = Masaki, Y. Int. Facing mounting evidence that several whale species worldwide were threatened with extinction, the IWC voted to implement a moratorium on commercial whaling beginning in 1986, at which time all legal whaling for Sei Whales stopped. Brownell, Jr., J.V. The species remained listed on the IUCN Red List of Threatened Species in 2000, categorised as "endangered". However, it is not a remarkable diver, diving only to relatively shallow depths for between five to fifteen minutes. 1 | pages = 98–106] In 1971, after a decade of high Sei Whale catch numbers, the species became scarce in Japanese waters, and commercial whaling for the whales ended in the western North Pacific in 1975.cite book | author = Committee for Whaling Statistics | year = 1942 | title =International whaling statistics | publisher = Committee for Whaling Statistics | location = Oslo] Off the coast of North America, Sei Whales were hunted in waters off British Columbia from the late 1950s to the mid 1960s, when the number of whales captured dropped to around 14 per year. Mem. The main focus of the research is to examine what Sei Whales eat and to determine the level of competition between whales and fisheries. Mem. Age, growth and reproduction | journal= Rep. Int. Whal. L’Explor. LVI.| publisher = Høst & Fils | location = Copenhagen ] In Iceland, a total of 2,574 whales were taken from the Hvalfjörður whaling station between 1948 and 1985. Explor. | coauthors = K. Darling | year = 1977 | title = On the biology of the eastern North Atlantic sei whale, "Balaenoptera borealis" Lesson | journal = Rep. Int. Whal. A 1991 study in the North Atlantic produced a total population in that area of only 4,000.cite paper | author = Braham, H. | year = 1992 | title = Endangered whales: Status update | publisher = Alaska Fisheries Science Center, Seattle, WA] This study used a common method of measurement called "catch per unit effort" (CPUE), which attempts to draw conclusions about abundance based upon the amount of time and effort that is required to locate the species in question. The whale's skin is often marked by pits or wounds, which after healing become white scars. Prior to catch quotas, whalers were limited only by their ability to locate the whales.cite book | author = Allen, K.R. The southernmost confirmed records are strandings along the northern Gulf of Mexico and in the Greater Antilles. | year =1985 | title = On the occurrence of sei whales ("Balenoptera borealis") in West Greenland waters | journal = Rep. Int. Whal. In the Southern Hemisphere, summer distribution based upon historic catch data is between 40°S–50°S latitude, while winter distribution is unknown. Winn | year = 1987 | title = Cetacean biomass densities near submarine canyons compared to adjacent shelf/slope areas | journal = Cont. 180 °W. Commn |volume = 38 |pages = 327–333] and later because of their comparatively small yield of oil and meat compared with other large whales, the Sei Whale was initially not methodically hunted. The maximum source level of the vocal sequences is reported as 156 decibels relative to 1 micropascal (μPa) for a reference distance of one metre.Habitat and migrationSei Whales are found worldwide, although they are only rarely found in polar or tropical waters. Ref. Populations in the Northern Hemisphere are listed as CITES Appendix II, indicating that they are not necessarily threatened with extinction, but may become so if they are not listed. Life Cycle Mating occurs in temperate, subtropical seas during the winter, and the gestation period is estimated to be 10 3/4 months,cite journal | author = Lockyer, C. |coauthors = and A.R. Lowry, T. Ragen, and R.R. It has single ridge extending from the tip of the snout to the paired blowholes that are a distinctive characteristic of baleen whales. Hill, R.L. Schevill (ed. The main focus of the research is to examine what Sei Whales eat and to determine the level of competition between whales and fisheries. "cite press release | publisher = The Institute of Cetacean Research, Tokyo, Japan | title = Japan not catching endangered whales | date = 2002-03-01 | url = http://www.icrwhale.org/eng/SEI.pdf | accessdate = 2006-11-10] He later added that "...Sei Whales are the second most abundant species of whale in the western North Pacific, with an estimated population of over 28,000 animals. In California waters, there was only one confirmed and five possible sightings from 1991 to 1993 aerial and ship surveys,cite paper | author = Hill, P.S. Mature adults typically measure between 12 and 15 metres (40–50 ft) and weigh 20–30 tonnes (22–33 tons). St. Helena. Southern hemisphere stocks were protected from whaling in 1979. Rev. Whal. Very little is known about their social structure. New Ser. Perm. For an animal of its size, it is notable because for the most part, its preferred foods lie relatively low in the food chain, including zooplankton and small fish. Females reproduce every 2–3 years, with as many as 6 foetuses being reported, but single births are far more common. Hill, R.L. Iss. Brownell, Jr., J.V. Hansen, D.L. Life Cycle Mating occurs in temperate, subtropical seas during the winter, and the gestation period is estimated to be 10 3/4 months,cite journal | author = Lockyer, C. |coauthors = and A.R. Whal. and K.A. Iss. and K.A. "cite press release | publisher = The Institute of Cetacean Research, Tokyo, Japan | title = Japan not catching endangered whales | date = 2002-03-01 | url = http://www.icrwhale.org/eng/SEI.pdf | accessdate = 2006-11-10] He later added that "...Sei Whales are the second most abundant species of whale in the western North Pacific, with an estimated population of over 28,000 animals. | year = 1994 | title = Validity of whaling data | doi=10.1038/367108a0 | journal = Nature | volume = 367 | pages = 108 ] means that catch data are not entirely reliable. Res. and T. Gerrodette | year = 1994 | title = Report of cetacean sightings during a marine mammal survey in the eastern Pacific Ocean and the Gulf of California aboard the NOAA ships "MacArthur" and "David Starr Jordan" July 28 - November 6, 1993 | publisher = U.S. Dept. [It is] clearly not endangered. Res. Commn | volume = 43 | pages = 315–321 ] Surveys in the Denmark Strait found 1,290 whales in 1987, and 1,590 whales in 1989. By the end of the period of exploitation (1974), the numbers of Sei Whales in the North Pacific had been reduced to between 7,260 and 12,620 whales.In the Southern Hemisphere, Sei Whale abundance estimates range between 9,800 and 12,000 whales, based upon the history of catches and CPUE in the southern oceans. Second within five days!! and subpolar waters around the South Orkney.! Sub-Tropical waters in the North Atlantic by the M.V populations are listed as depleted is! East of long 1995 | title = Biological studies on the ends inside the mouth near the tongue Orkney.. 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