Sei whales are polygynous, one male having exclusive mating rights with many females. However, killer whales are known to also attack large whales. Previously, these vocalizations were assumed to be connected to social context and not connected to the location of prey. Ellis 1991, Baumgartner & Fratantoni 2008).

Baumgartner & Fratantoni 2008).

In Greenland, sightings are concentrated off Lille Hellefiske in the southwest as well as off the southwestern tip of the island. (in press). How did a 33ft whale end up in the middle of a field in East Yorkshire? Aquatic Mammals, 35(3), 313-318. https://doi.org/10.1578/AM.35.3.2009.313, Palka, D.L., Chavez-Rosales, S., Josephson, E., Cholewiak, D., Haas, H.L., Garrison, L., … and Orphanides, C. (2017). of the Interior, Bureau of Ocean Energy Management, Atlantic OCS Region, Washington, DC.
The survey in 1995 yielded an estimate of 9,249 sei whales (95% CI: 3,700 – 23,116), which could suggest a northward shift in distribution (Borchers & Burt 1997). Exploitation of Large Whales in West Greenland in the Twentieth Century. In Canada, sei whales have been confirmed in the Davis Strait and the continental shelf areas along the coasts of Labrador and Newfoundland. Persistent organic pollution levels in sei whales are not known. Ellis, R. (1991).
Estimated Abundances of Cetacean Species in the Northeast Atlantic from Norwegian Shipboard Surveys Conducted in 2014–2018.

Retrieved from: https://www.dailymail.co.uk/news/article-2043105/How-did-Sei-whale-beached-middle-field-East-Yorkshire.html, Huijser, L.A.E., Bérubé, M., Cabrera, A.A. et al. 2014). The current number of mature individuals is estimated to be around 50,000 globally (Cooke 2018). Biological Conservation, 164, 107-122. https://doi.org/10.1016/j.biocon.2013.04.010, Häussermann, V., Gutstein, C.S., Bedington, M., Cassis, D., Olavarria, C., Dale, A.C., Valenzuela-Toro, A.M., Perez-Alvarez, M.J., Sepúlveda, H.H., McConnell, K.M., Horwitz, F.E. Available at https://synergy.st-andrews.ac.uk/scans3/files/2017/04/SCANS-III-design-based-estimates-2017-04-28-final.pdf, Hammond, P. S., Macleod, K., Berggren, P., Borchers, D. L., Burt, M. L., Cañadas, A., … and Vázquez, J. (n.d.). Sei Whales are usually solitary or sometimes in small groups from 2 to 5 individuals. Mating takes place during the winter. Sei Whale. They note that “Surveys reveal little sign of recovery in the Northeastern Atlantic” (IWC n.d.). Wageningen Marine Research. (2019a) Estimates of the abundance of cetaceans in the central North Atlantic based on the NASS Icelandic and Faroese shipboard surveys conducted in 2015. Pike et al., 2011, 2019a,b). Whaling data from the 1970s gives the best indication of a well-defined sei whale wintering area off the Iberian Peninsula (e.g Prieto et al. There are indications that the cause was a harmful toxic algal bloom caused by a strong El Niño event (Häussermann et al., 2017). (2017a). BABY CARRYING. Hammond et al. fleeing, diving, cessation of feeding) or to damage to the ears, causing temporary or permanent loss of hearing. Sei whale. Largest baleen whale mass mortality during strong El Niño event is likely related to harmful toxic algal bloom. Sei whales are found throughout the world’s oceans and are present in the North Atlantic, Pacific and Southern Oceans, but there are no records from the Northern Indian Ocean (Cooke 2018). Sei whales have also been observed in the West Greenland-Labrador Sea, an area not assigned to any of these stocks (Cooke 2018). This is when the Sei Whales which live in the Northern Hemisphere are typically mating. 2013, 2017; Leonard & Øien 2020a,b, Pike et al. Journal of the Acoustical Society of America, 138(4), 2367-2372. http://dx.doi.org/10.1121/1.4930900, Shefferly, N. (1999). In the southwestern Gulf of Maine, sei whales seem to prefer to feed on C. finmarchicus at or near the surface (Bumgartner et al. It avoids polar and tropical waters and semienclosed bodies of water. [4], When it comes to mating season, male and females become a social unit, in winter months is when the Sei Whale mate; between November and February. The sei whale is a species for which there is limited knowledge. 2008). Of the rorquals, only the fin and blue whales are larger. The sei whales occupying the Southern Hemisphere are generally larger than their northern conspecifics. Distribution and preliminary abundance estimates for cetaceans seen during Canada’s marine megafauna survey – A component of the 2007 TNASS. IWC Scientific Committee Document SC/61/RMP10. New York: Alfred A. Knopf, Inc. Español-Jiménez, S., Bahamonde, P.A., Chiang, G. and Häussermann, V. (2018). The Greenlandic Red List (2007) lists the species as Data deficient. At birth, the baby Sei Whale is around 4~5 meters, which is 13~16ft. This indicates temporal variation in their migration patterns. 2012). However, ship strikes could go unnoticed due to both the sei whale’s negative buoyancy (making them sink when dead), and the lack of visibility immediately in front of ships.

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