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The genus Balaenoptera contains the following extant species and subspecies: [2] [5] Common minke whale ( Balaenoptera acutorostrata ) North Atlantic minke whale ( Balaenoptera acutorostrata acutorostrata) North Pacific minke whale ( Balaenoptera acutorostrata scammoni) Antarctic minke whale ( Balaenoptera bonaerensis)
The blue whale (Balaenoptera musculus) is a marine mammal and a baleen whale. Reaching a maximum confirmed length of 29.9 meters (98 ft) and weighing up to 199 tonnes (196 long tons; 219 short tons), it is the largest animal known ever to have existed.
- B. musculus
- Balaenoptera
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- Etymology
- Taxonomy
- Description
- Life History
- Range and Migration
- Whaling
- Conservation Status
- See Also
- External Links
"Sei whale" is an anglicization of the Norwegian sejhval, meaning "pollock whale". The species was so called because it "appeared off the coast of Norway at the same time each year as the pollock that came to feed on the abundant plankton". In the Pacific, the whale has been called the Japan finner; "finner" was a common term used to refer to rorqu...
On 21 February 1819, Swedish-born German naturalist Karl Rudolphi initially identified a 9.8 m (32 ft) whale stranded near Grömitz, in Schleswig-Holstein, as Balaena rostrata (Balaenoptera acutorostrata). In 1823, the French naturalist Georges Cuvier described Rudolphi's specimen under the name "rorqual du Nord". In 1828, Rene Lesson translated thi...
The sei whale's body is typically a dark steel grey with irregular light grey to white markings on the ventral surface, or towards the front of the lower body. The whale has a relatively short series of 32–60 pleats or grooves along its ventral surface that extend halfway between the pectoral fins and umbilicus (in other species it usually extends ...
Surface behaviours
Very little is known about the sei whale social structure. They have been documented traveling alone or in pods of up to six individuals; larger groups may assemble at particularly abundant feeding grounds. During the southern Gulf of Maine influx in mid-1986, groups of at least three sei whales were observed "milling" on four occasions – i.e. moving in random directions, rolling, and remaining at the surface for over 10 minutes. One whale would always leave the group during or immediately af...
Feeding
This rorqual is a filter feeder, using its baleenplates to obtain its food by opening its mouth, engulfing or skimming large amounts of the water containing the food, then straining the water out through the baleen, trapping any food items inside its mouth. The sei whale feeds near the surface of the ocean, swimming on its side through swarms of prey to obtain its average of about 900 kg (2,000 lb) of food each day. For an animal of its size, its preferred prey lies low within the food chain;...
Parasites and epibiotics
Ectoparasites and epibiotics are rare on sei whales. Species of the parasitic copepod Pennella were only found on 8% of sei whales caught off California and 4% of those taken off South Georgia and South Africa. The pseudo-stalked barnacle Xenobalanus globicipitis was found on 9% of individuals caught off California; it was also found on a sei whale taken off South Africa. The acorn barnacle Coronula reginae and the stalked barnacle Conchoderma virgatum were each only found on 0.4% of whales c...
Sei whales live in all oceans, although rarely in polar or tropical waters.The difficulty of differentiating them at sea from their close relatives, Bryde's whales and in some cases from fin whales, creates confusion about their range and population, especially in warmer waters where Bryde's whales are most common. In the North Atlantic, its range ...
The development of explosive harpoons and steam-powered whaling ships in the late nineteenth century brought previously unobtainable large whales within the reach of commercial whalers. Initially, the sei whale's speed and elusiveness partially protected them, and later the comparatively small yield of oil and meat. Once stocks of more profitable r...
The sei whale is listed by the IUCN Red List as endangered, and with an increasing population trend, as of 2018. 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. Before quotas, there were no legal limits.Complete ...
ARKive – images and movies of the sei whale (Balaenoptera borealis)- B. borealis
- Balaenoptera
Balaenoptera acutorostrata. Balaenoptera bonaerensis. The minke whale ( / ˈmɪnki / ), or lesser rorqual, is a species complex of baleen whale. [1] The two species of minke whale are the common (or northern) minke whale and the Antarctic (or southern) minke whale. [2]
The fin whale (Balaenoptera physalus), also known as the finback whale or common rorqual, is a species of baleen whale and the second-longest cetacean after the blue whale. The biggest individual reportedly measured 26 m (85 ft) in length, with a maximum recorded weight of 77,000–81,000 kg (170,000–179,000 lb).
- B. physalus
- Balaenoptera
The common minke whale or northern minke whale (Balaenoptera acutorostrata) is a species of minke whale within the suborder of baleen whales. It is the smallest species of the rorquals and the second smallest species of baleen whale.
Rorquals ( / ˈrɔːrkwəlz /) are the largest group of baleen whales, comprising the family Balaenopteridae, which contains ten extant species in three genera.
