irrawaddy dolphin scientific name

Published by on November 13, 2020

The fishermen attempt to gain the attention of the dolphins through various efforts such as using a cone-shaped wooden stick to drum the side of their canoes, striking their paddles to the surface of the water, jingling their nets, or making calls that sound turkey-like. Generally a slow-moving species of dolphin they can reach speeds of up to 25 miles per hour when threatened or startled and while they aren’t known for being particularly acrobatic they have been spotted occasionally leaping out of the water. The Irrawaddy dolphin (Orcaella brevirostris) is a euryhaline species of oceanic dolphin found in discontinuous subpopulations near sea coasts and in estuaries and rivers in parts of the Bay of Bengal and Southeast Asia. [8], Irrawaddy dolphins are shy of boats, not known to bow-ride, and generally dive when alarmed. [4], Interspecific competition has been observed when Irrawaddy dolphins were forced inshore and excluded by more specialized dolphins. Observations of captive animals indicate food may be taken into the mouth by suction. No range-wide survey has been conducted for this vulnerable species; however, the worldwide population appears to be over 7, 000, with over 90% occurring in Bangladesh. The protection of the Irrawaddy dolphin is crucial for the overall health of the Mekong River—home to an estimated 1,100 species of fish. Drowning in gillnets is the main threat to them throughout their range. The Irrawaddy dolphin has a unique look among dolphins. Global warming, climate changes and the construction of dams are also believed to play a role in the endangerment of this species. In January 2012, the Cambodian Fisheries Administration, the Commission for Conservation and Development of Mekong River Dolphin Eco-tourism Zone, and WWF signed the "Kratie Declaration on the Conservation of the Mekong River Irrawaddy Dolphin", an agreement binding them to work together, and setting out a roadmap for dolphin conservation in the Mekong River. In the Northern Hemisphere, mating is reported from December to June. The dorsal fin is small; their flippers are long and large, with curved leading edges and rounded tips, their tails are also large. The species found in Borneo, the finless porpoise, Neophocaena phocaenoides, is similar and has no back fin; the humpback dolphin, Sousa chinensis, is larger, has a longer beak and a larger dorsal fin. The dorsal fin is small and rounded behind the middle of the back. In the past, the most direct threat was killing them for their oil. The protection measures in the area include prohibition of catching or killing of dolphins and trade in whole or parts of them, and prohibiting the use of gillnets. Disclosure Policy | Privacy Policy | Copyright © 2020 Groups of fewer than six individuals are most common, but sometimes up to 15 dolphins are seen together. Genetically, the Irrawaddy dolphin is closely related to the killer whale (orca). Retrieved 2014-10-20. WWF conducts research to learn about dolphin mortality, population and ecology. The Irrawaddy dolphin has an instantly recognisable, charismatic rounded face and head with no beak; they look like baby belugas, only with a dorsal fin. The flippers are long and broad. Entanglement in fishnets and degradation of habitats are the main threats to Irrawaddy dolphins. They have a large forehead and rounded skull which lacks the appearance of a snout or beak. Together, we can: Adopt a whale and help us protect these amazing creatures. Not much is known about the hunting methods of the Irrawaddy dolphin but it is known that their diet consists of fish, cephalopods, crustaceans and fish eggs. In Burma, in the upper reaches of the Ayeyawady River, Irrawaddy dolphins drive fish towards fishers using cast nets in response to acoustic signals from them. Marine Irrawaddys also eat squid and octopus and seem to follow tides, moving inshore and into river mouths with high tides, and further offshore as the tides go out, probably following the movements of their prey. The Irrawaddy Dolphin features a round head and they don’t have a beak. (+49 228) 815 2449, Contact, This site is maintained by the CMS Secretariat © 2020, CMS Secretariat, Platz der Vereinten Nationen 1, 53113 Bonn, Germany. The dolphins often dive deeply just after the net is thrown and create turbulence under the surface around the outside of the net. 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