Sei Whale

 

Animal Unique | Sei Whale | Sei whale is a baleen whale, the third largest rorqual after the blue whale and the fin whale.However, they do not like extreme environments and are less likely to be found in polar waters than other rorqual. Subarctic and subantarctic preference for summer feeding, but the majority of sei whales are found in temperate and subtropical waters, and the annual migrations between these areas. This species is essentially an inhabitant of the open ocean, generally not along the coast or in coastal waters found, and tend to shelf contours following areas in search of plankton abundance. The Sei whale migrates annually from cool and subpolar waters in summer and winter in temperate and subtropical waters.

Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Mammalia
Order:     Cetacea
Suborder:     Mysticeti
Family:     Balaenopteridae
Genus:     Balaenoptera
Species:     B. borealis

Sei whale, their dorsal fins are well defined and a bit addicted and are about two-thirds back along their bodies. Their head and jaws are rather narrow and slightly curved, unlike other rorqual. They are a mottled dark gray, with paler undersides (sometimes with irregular white markings). Females are generally larger than males. Their muzzle is pointed and their pectoral fins are short. Their dorsal fins are sickle-shaped.

Sei whale is similar to other large baleen whales. The best way to distinguish between him and Bryde's whale, regardless of differences in the ribs, by the presence of lateral ridges on the dorsal surface of the rostrum Bryde's whale. Large specimens can be confused with fin whales, fin whales is asymmetric unless the head of color is clearly visible. The whale is the lower jaw of the right side is white, and the left side is gray. When viewed from the side, the top of the head of the Sei whale has a small arc between the tip of the rostrum and eye, while the fin profile is relatively flat.

Sei whales tend to swim in pods of 3-5 animals, and rarely deeper than 300 m. Although little is known about how this kind of communicate, showed that the low frequency pulses are common among them. Little is known about the actual social system of these animals. Groups of 2-5 people are usually seen, but sometimes thousands may gather if food is plentiful. However, these big aggregations are not dependent on food alone, because they often occur in times of migration. Sei whales are among the fastest cetaceans, swim at a speed exceeding 50 km per hour. Although distinguished by their speed, sei whales are not remarkably diverse. These whales dive only to shallow depths, and they remain submerged only 5-10 minutes each time.

Sei whale is using the ribs in order to obtain his food by opening his mouth, engulfing large amounts of water with the food, then presses the water through the baleen, trapping any food items in his mouth . The Sei whale feeding near the surface of the ocean, swimming on his side through swarms of prey on the average to obtain about 900 kg of food per day. For an animal of its size, for the most part, his favorite foods are unusually low relative to the food chain, including zooplankton and small fish.

Sei whales were not traditionally targets for whalers because they lived in the same waters as blue, fin and humpback whales, which are the preferred quarry. However, when the whales became scarce and then protected, sei, the first catch of the mid-1960s. Some researchers have concluded that the sei whale population increased due to reduction of the blue and fin whale populations. This conclusion must however be taken with caution, because actual data is scarce, and the diet overlap between Sei whales and other species is not complete.

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