Finless Porpoise

 

Animal Unique | Finless Porpoise | The Finless porpoise is one of six porpoise species. The waters around Japan, at the northern end of its range, it is known as the sunameri. A freshwater population found in the Yangtze River in China is known locally as the jiangzhu or "river pig". Finless porpoise is mainly the kind of coast, which stretches in both salt and fresh water. Finless porpoise seem to prefer dark or cloudy conditions and can be found in warm rivers and lakes (when connected to river), mangroves, estuaries, deltas, and marshes. There are three subspecies of Finless porpoise; Finless porpoise (Indian Ocean), N. phocaenoides phocaenoides; Finless porpoise (West Pacific), N. phocaenoides sunameri; and Finless porpoise (Yangtze), N. phocaenoides asiaeorientalis.

Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Mammalia
Subclass:     Eutheria
Order:     Cetacea
Suborder:     Odontoceti
Family:     Phocoenidae
Genus:     Neophocaena
Species:     N. phocaenoides

The Finless porpoise are named for their distinct lack of a dorsal fin. Instead, their back is a small ledge that starts just behind the blowhole, and extends to the tail, the back is covered with small round bumps known as tubercles.They have a small mouth curved and unfused neck vertebrae, which are unrestricted movement of the head can. About 50% of Finless porpoise have pink eyes. The streamlined body is blue-gray in color (in Japan and northern China, the adults light gray), which darkens to black after death.

Finless porpoises are reported in fish and shrimp in the Yangtze River, and fish, shrimp and squid meal in the Yellow Sea / Bohai area and from Pakistan. In Japanese waters, they are known to fish, shrimp, squid, cuttlefish and octopus to eat. Finless porpoises are opportunistic feeders with different types of available food items available in their habitat. Seasonal changes in their diet have not been investigated. They also seem to take some plant material when living in estuaries, mangroves, and rivers, including leaves, rice and eggs deposited on vegetation.

Finless porpoise are observed in groups of between 1-4 people, although aggregations of 20-50 are not uncommon. They are known to spy hop, a behavior that they are vertical to raise their heads from the water to the eyes are exposed, then they cut back their heads in the water. There have been reports of mothers and their calves on their backs. Like other porpoises, their behavior is usually not as energetic and showy as those of dolphins. They do not ride bow waves, and in some areas seem to be shy of boats.

Although they show no acrobatics in the water, Finless porpoises are believed to be very active swimmers. They often swim just below the surface of the water and roll to one side as on the surface to breathe. This rolling movement disturbs very little water on the surface, which often overlooked when rising to breathe. Pavements generally lasts one minute, when three to four quick successive breaths, then quickly submerge in water. They often surface a considerable distance from the point where they dive below the surface.

On the IUCN "red list" database of endangered species, Finless porpoise is listed as "vulnerable" due to marked decreases in the best-studied populations in the Sea of ​​Japan, and the Yangtse basin. The fresh water species in the Yangtze River is characterized as endangered. Because this species is in coastal waters, it has a high degree of interaction with people, often the finless porpoise in danger. Like other porpoises, large numbers of this species from entanglement in gillnets slain. Besides being hunted shortly after World War II due to the lack of a seaworthy fishing boats, finless porpoises have never hunted on a large scale in Japan.

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