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Balaenoptera borealis   Lesson, 1828

sei whale
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Image of Balaenoptera borealis (sei whale)
Balaenoptera borealis
Picture by FAO

Classification / Names Common names | Synonyms | CoL | ITIS | WoRMS

Mammalia | Cetacea | Balaenopteridae

Environment / Climate / Range Ecology

Pelagic; depth range 0 - 342 m (Ref. 116169).  Tropical; 8°C - 25°C (Ref. 75906); 90°N - 90°S, 180°W - 180°E

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Circumglobal: Balaenoptera borealis borealis: Greenland, Iceland, Norway, North Carolina, Bay of Biscay, Mediterranean Sea, South Carolina, Gulf of Mexico, Bay of Campeche, Caribbean Sea, Cuba, Anguilla, Morocco, Mauritania, Alaska, Bering Sea, Gulf of Alaska, Japan, Southern California, Ogasawara, Mexico, Islas Revilla Gigedo (Pacific Ocean); Balaenoptera borealis schlegellii: Antarctica, Brazil, Angola, South Africa, Western Australia, Cook Straits, New Zealand, Peru, Java Indonesia (Ref. 1522).

Length at first maturity / Size / Weight / Age

Maturity: Lm 1,330.0  range ? - ? cm Max length : 1,800 cm TL male/unsexed; (Ref. 1394); max. published weight: 30.0 t (Ref. 1394)

Biology     Glossary (e.g. epibenthic)

Largest of the sei whales. Found in open oceans, restricted to mid-latitude temperate zones. Skims copepods and other small prey types (Ref. 1394). Mean lengths at maturity is 1330 cm for females and 11280 cm for males (Ref. 75906). As the larger rorquals became scarce in recent decades, hunting pressure on sei, Bryde’s, and minke whales increased, largely in the Antarctic. Although heavily depleted, sei whales have recovered somewhat more successfully from hunting than other large baleen whales (Ref. 1394). Found in open oceans (Ref. 1394); feed at the shelf break and seaward throughout the summer (Ref. 96832). Restricted to mid-latitude temperate zones. Skims copepods and other small prey types (Ref. 1394); also feeds on euphausiids and a variety of fish including saury and whiting. Also a "swallower". Zooplankton concentrations influence where the whales feed. Migratory (Ref. 96832). Commonly in groups of 2 to 5 individuals (Ref. 801).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference References | Coordinator | Collaborators

Jefferson, T.A., S. Leatherwood and M.A. Webber. 1993. (Ref. 1394)

IUCN Red List Status (Ref. 115185)

  Endangered (EN) (A1ad)

CITES status (Ref. 108899)

CMS (Ref. 116361)

Threat to humans

Human uses

Fisheries: commercial
FAO(fisheries: production) | FisheriesWiki | Sea Around Us

More information

Common names
Synonyms
Predators
Reproduction
Maturity
Spawning
Fecundity
Eggs
Egg development
Age/Size
Growth
Length-weight
Length-length
Morphology
Larvae
Abundance
References
Mass conversion

Internet sources

BHL | BOLD Systems | CISTI | DiscoverLife | FAO(fisheries: species profile; publication : search) | GenBank (genome, nucleotide) | GloBI | GOBASE | Google Books | Google Scholar | Google | ispecies | PubMed | Scirus | Tree of Life | uBio | uBio RSS | Wikipedia (Go, Search) | Zoological Record

Estimates of some properties based on models

Vulnerability (Ref. 71543)
Very high vulnerability (90 of 100)
Price category (Ref. 80766)
Unknown