Recordings of low-frequency tonal and frequency swept calls were made near a group of four or five sei whales in waters west of the Antarctic Peninsula on 19 February 2003. These whales also produced broadband sounds which can be described as growls or whooshes. Erlenstraße 18, 73663 Berglen, Germany, Ocean Sounds Norway: In the Pacific, the whale has been called the Japan finner; "finner" was a common term used to refer to rorquals. Like those of the right whale, the sei’s baleen bristles are extremely fine (about the diameter of a human hair) and are used for feeding on small crustaceans such as copepods and krill. A newborn is weaned from its mother at 6–9 months of age, when it is 8–9 m (26–30 ft) long,[29] so weaning takes place at the summer or autumn feeding grounds. [77] Seven whales tagged off Faial and Pico from May to June in 2008 and 2009 made their way to the Labrador Sea, while an eighth individual tagged in September 2009 headed southeast – its signal was lost between Madeira and the Canary Islands. Register to receive personalised research and resources by email, The International Journal of Animal Sound and its Recording, Southwest Fisheries Science Center , 8604 La Jolla Shores Dr., La Jolla , CA , 92037 , USA, /doi/pdf/10.1080/09524622.2007.9753572?needAccess=true. This article was most recently revised and updated by, International Union for Conservation of Nature, National Marine Fisheries Service - Sei Whale. By closing this message, you are consenting to our use of cookies. [90], In 2010, a Los Angeles restaurant confirmed to be serving sei whale meat was closed by its owners after prosecution by authorities for handling a protected species. Prior to commercial whaling, the North Pacific hosted an estimated 42,000. [73] In the northeast Atlantic, the sei whale winters as far south as West Africa such as off Bay of Arguin, off coastal Western Sahara and follows the continental slope northward in spring. [11] They were hunted in large numbers off the coasts of Norway and Scotland beginning in the late 19th and early 20th centuries,[74] and in 1885 alone, more than 700 were caught off Finnmark. [105] Prior to commercial whaling, there were an estimated 65,000. Heavy exploitation in the North Pacific began in the early 1960s, with catches averaging 3,643 per year from 1963 to 1974 (total 43,719; annual range 1,280–6,053). Sei whales are the least well known acoustically of all the rorquals, with only two brief descriptions of their calls previously reported. It is listed on Appendix I[95] as this species has been categorized as being in danger of extinction throughout all or a significant proportion of their range and CMS parties strive towards strictly protecting these animals, conserving or restoring the places where they live, mitigating obstacles to migration and controlling other factors that might endanger them and also on Appendix II[95] as it has an unfavourable conservation status or would benefit significantly from international co-operation organised by tailored agreements. [76] An individual satellite-tagged off Faial, in the Azores, traveled more than 4,000 km (2,500 mi) to the Labrador Sea via the Charlie-Gibbs Fracture Zone (CGFZ) between April and June 2005. Sei whales tend to inhabit more temperate waters than Bryde's whales, although neither species goes into the polar ice regions. These calls averaged 82.3 Hz down to 34 Hz over about 1.4 seconds in duration. This research presents sounds recorded in the presence of Sei whales near the Hawaiian Islands in November, 2002. borealis.[23]. [30][31][32] The largest specimens taken off Iceland were a 16.15 m (53.0 ft) female and a 14.6 m (48 ft) male, while the longest off Nova Scotia were two 15.8 m (52 ft) females and a 15.2 m (50 ft) male. This website uses cookies. [18] 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". In the North Atlantic, it feeds primarily on calanoid copepods, specifically Calanus finmarchicus, with a secondary preference for euphausiids, in particular Meganyctiphanes norvegica and Thysanoessa inermis. [46][49] Some of these fish are commercially important. [6] More than 2,000 were caught in British Columbian waters between 1962 and 1967. Sei whales are the least well known acoustically of all the rorquals, with only two brief descriptions of their calls previously reported. “, A newly discovered species of living baleen whale, Low-frequency ambient noise in the deep sound channel—The missing component, Autonomous Acoustic Recording Packages (ARPs) for long-term monitoring of whale sounds, This option allows users to search by Publication, Volume and Page. Endangered Species Act. Sounds produced by the sei whale Balaenoptera borea-lis are perhaps the most poorly documented for any rorqual. These are now known to be caused by "cookie-cutter" sharks (Isistius brasiliensis). Selecting this option will search all publications across the Scitation platform, Selecting this option will search all publications for the Publisher/Society in context. Large females lead the northward migration and reach the Denmark Strait earlier and more reliably than other sexes and classes, arriving in mid-July and remaining through mid-September. [97][98] Sei whales were said to have been scarce in the 1960s and early 1970s off northern Norway. Whales in the Labrador Sea as early as the first week of June may move farther northward to waters southwest of Greenland later in the summer. The Sei Whale: Population Biology, Ecology and Management (, Knowlton, A. R., Clark, C. W., and Kraus, S. D. (1991). Use, Smithsonian schlegelii). [81], In Iceland, a total of 2,574 whales were taken from the Hvalfjörður whaling station between 1948 and 1985. Little is known about the sounds produced by the Sei Whale Balaenoptera borealis and no recordings have been made in their presence in the Pacific Ocean. Website © 2020 AIP Publishing LLC. The blowholes and dorsal fin are often exposed above the water surface almost simultaneously. Bjornhaugen 20 Sei whale - Balaenoptera borealis. Sei whales are the least well known acoustically of all the rorquals, with only two brief descriptions of their calls previously reported. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Get exclusive access to content from our 1768 First Edition with your subscription. [13] In western Canadian waters, researchers with Fisheries and Oceans Canada observed five Seis together in the summer of 2017, the first such sighting in over 50 years. “, Wada, S., Oishi, M., and Yamada, T. K. (2003). Relatively little is known about specific calls, but in 2003, observers noted sei whale calls in addition to sounds that could be described as "growls" or "whooshes" off the coast of the Antarctic Peninsula. The average duration of the tonal calls is 0.45+/-0.3 s and the average frequency is 433+/-192 Hz. [9] 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. Between dives, the whale surfaces for a few minutes, remaining visible in clear, calm waters, with blows occurring at intervals of about 60 seconds (range: 45–90 sec.). Recordings of low-frequency tonal and frequency swept calls were made near a group of four or five sei whales in waters west of the Antarctic Peninsula on 19 February 2003. This combination distinguishes their calls from those of other whales. [28] The average age of sexual maturity of both sexes is 8–10 years. ABSTRACT Little is known about the sounds produced by the Sei Whale Balaenoptera borealis and no recordings have been made in their presence in the Pacific Ocean. Quotas on sei whales in the North Atlantic began in 1977. Southern Hemisphere stocks were protected in 1979. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. This research presents sounds recorded in the presence of Sei whales near the Hawaiian Islands in November, 2002. The sei whale did not have meaningful international protection until 1970, when the International Whaling Commission first set catch quotas for the North Pacific for individual species. [34][35] The longest measured by Discovery Committee staff were an adult male of 16.15 m (53.0 ft) and an adult female of 17.1 m (56 ft), both caught off South Georgia. [75], In the North Pacific, the total reported catch by commercial whalers was 72,215 between 1910 and 1975;[11] the majority were taken after 1947. The sei-whale". “, Sounds recorded in the presence of Sei whales, Balaenoptera borealis, Proceedings of the Ninth Biennial Conference on the Biology of Marine Mammals, Some possible factors affecting age distribution of the catch of sei whales in the Antarctic, DIFAR hydrophones applied to whale research, Mellinger, D. K., Carson, C., and Clark, C. W. (2000). …1960s; then came the smaller sei whale (, fin whale, sei whale, Bryde’s whale, and minke whale. Using a calibrated seafloor recorder to determine the absolute calibration of a sonobuoy system, the maximum source level of the tonal calls was 156+/-3.6 dB re 1 μPa at 1 m. Each call had different character and there was no temporal pattern in the calling.

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