This dolphin species is characterized by having a blunt forehead and nose, in contrast to the pointed nose of many oceanic species of dolphin. Irrawaddy dolphins are not thought to communicate through vocal signals. They have a high rounded forehead and no beak. “A little gift from Cozumel Island Mexico / a little gift from Cozumel Island Mexico.”. Habitat and subpopulations. Irrawaddy dolphins are listed as Endangered (EN A2cd+3cd+4cd): “Irrawaddy Dolphin habitat overlaps strongly with severe threats from growing human activities. The primary factor responsible for population declines in both their freshwater and marine habitat is incidental mortality in small-scale fisheries, especially gillnets. Community-based ecotourism in the ADPA is currently being developed to create a link between tourism and conservation and to provide visitors with a quality educational experience focusing on the uniqueness of the human-dolphin cooperative fishing phenomenon, local culture, and other natural attractions including observing migratory water birds. Habitat and subpopulations. 320 p. 587 figs. The primary threats these dolphins face include pollution or water poisoning, collisions with boats and getting caught in fishing nets. They display a unique behavior of expelling a stream of water up to 1.5 m which is thought to be used to herd fish. In Myanmar, this amazingly cleaver and intelligent species has learned to fish in a mutually beneficial way together with cast net fishermen, termed “cooperative fishing”—a phenomenon found nowhere else in the world. Similar to bats and other dolphins, the Irrawaddy dolphin uses echolocation to find fish, navigate and interact with each other. 1993. When it comes to cetaceans estimating the life expectancy of 40 or so species of dolphin can be quite a challenge as there is no specific answer for all of the species. Report of the International Whaling Commission. They have also been caught in anti-shark gillnets in Australia and have become entangled in fishing gear in other areas. The Irrawaddy Dolphin is a critically endangered species that inhabits murky waters of rivers and estuaries in Southeast and South Asia. OUR DATA: We use the most recent data from these primary sources: AnAge, UMICH, Max Planck, PanTHERIA, Arkive, UKC, AKC. While it is unclear whether or not their habitat is solely responsible for their lifespan we can assume that their lifespan may be partially based on their species. Jefferson, T.A., S. Leatherwood, and M.A. This tradition is part of Myanmar’s rich natural and cultural heritage and is one of the best examples of a symbiotic relationship between man and nature. Fishermen arrested after killing rare freshwater dolphin in Cambodia, Whale and Dolphin Conservation Society (WDCS), Florida Museum of Natural History Ichthyology Department, “Why there is hope that the world’s coral reefs can be saved”, THE BANDA ARC, Life in Alor and the Banda Sea (4k), Mimmo Roscigno: A couple of nursehound, Mediterranean Sea, Sorrento Coast, Italy, China’s new submersible dives 35,790ft down the Mariana Trench carrying three men in a record-breaking expedition, Entangled: How a Global Seaweed ‘Plague’ Threatens West Africa’s Coastline, An unusual spotted eagle ray video! Social structure, Reproduction and growth. There are plenty of food items that this dolphin feeds upon. 44: 367-369. Ecotourism is a vital component of protected area management because it gives value to the dolphins as “living resource.” In 2015, the ADPA was selected as one of Myanmar’s official strategic ecotourism pilot sites as part of the Myanmar Ecotourism Policy and Management Strategy. Irrawaddy dolphins, Orcaella brevirostris (Owen in Gray, 1866), aka Mekong or Mahakam River dolphin, reach 2-2.75 m in length. Factors such as diet (captive dolphins are often fed a strict diet that may not include the prey they normal consume or be prepared in a way they would normally consume it), a closed environment (being separated from the wide and open ocean) and a lack of a strong social structure (being separated from family and potential friends) may all contribute to the shorter lifespan of captive dolphins. Female killer whale for example are extremely social and have been known to live for as many as 90 years, although the average life expectancy for a female killer whale is usually around 50 years. The first scientific survey of dolphins in Myanmar was conducted in 2002, which found them to be found in a 400 km stretch of river between Bhamo and Mingun. Irrawaddy dolphins usually reproduce one offspring every 2 – 3 years. A dolphin's life span varies according to its environment and species. Current IUCN Conservation Status of Irrawaddy Dolphins|Conservation Evidence|NOAAUNEP World Conservation Monitoring Centre: Irrawaddy Dolphins|Check the Seafood Watch List for this species. Fishermen have reported Irrawaddy river dolphins stunning large fish then playing with them before they eat them. At the end of this article we’ve also included a list with estimates for the life expectancy of several dolphin species. Irrawaddy dolphin demography in the Mekong River: an application of mark–resight models Thousands of rare Irrawaddy dolphins found (1/12). 320 p. 587 figs. Preliminary Surveys of Irrawaddy Dolphins (Orcaella brevirostris) in Lao PDR and Northeastern Cambodia. Little is known about Irrawaddy dolphins’ life history. Feeding. For example the Amazon river dolphin ( a freshwater dolphin) has a life expectancy of only 15 – 20 years while the Stripped dolphin may live to be 50 – 60 years. Irrawaddy dolphins, Orcaella brevirostris, feed on fishes, crustaceans, cephalopods, and fish eggs. Newborns measured following birth in captivity were 96 cm long and weighed 12.3 kg. During foraging periods, herds of about 7 dolphins will circle around prey and trap their victim. Like other river dolphins their neck is highly flexible, which enables them to forage in shallow water. When brought up in captivity and isolated from friends and family members the killer whales live expectancy dramatically declines and most killer whales usually don’t live past their 20’s. The color of Irrawaddy dolphins is dark blue to dark gray ranging to pale gray, with a pale ventral (under) side. WCS, the "W" logo, WE STAND FOR WILDLIFE, I STAND FOR WILDLIFE, and STAND FOR WILDLIFE are service marks of Wildlife Conservation Society. Their gestation period is estimated at about 14 months. Irrawaddy dolphins also appear to follow tides, moving inshore and into river mouths with high tides, and further offshore as the tides go out 6-10, probably following the movements of the fish that they eat. Fishermen arrested after killing rare freshwater dolphin in Cambodia Whale and Dolphin Conservation Society (WDCS) Baird, I.G., B. Mounsouphom and P.J. One calf was nursed for about 2 years, although it began consuming fish at 6 months. A dolphins species also plays a big role in determining how long a dolphin will live. Research Orcaella brevirostris @Barcode of Life ~ BioOne ~ Biodiversity Heritage Library ~ CITES ~ Cornell Macaulay Library ~ Encyclopedia of Life (EOL) ~ ESA Online Journals ~ FishBase ~ Florida Museum of Natural History Ichthyology Department ~ GBIF ~ Google Scholar ~ ITIS ~ IUCN RedList (Threatened Status) ~ Marine Species Identification Portal ~ NCBI (PubMed, GenBank, etc.) Since 1998, The MarineBio Conservation Society has been a nonprofit volunteer marine conservation and science education group working online together to educate the world about ocean life, marine biology, marine conservation, and a sea ethic. The protected area was established to reduce threats to dolphins, which include electric fishing, gill nets, pollution, sedimentation of key habitat and breeding areas, and boat traffic. Discover How Long Irrawaddy dolphin Lives. Although some bottlenose dolphins can reach 40 years of age, their average age is between 15 and 16 years. Melville’s Whale Was a Warning We Failed to Heed, Amanda Jelena Radoman: Manatees being fed sweet potatoes… while looking like sweet potatoes, Trying to Make Sense of This Overwhelming World. They have a small, blunt, rounded triangular dorsal fin and large flippers. Little is known about the reproductive habits of Irrawaddy dolphins. Although they are generally slow swimmers, a swim rate of 25 kph was recorded for one individual. GBIF network ~ OBIS distribution map ~ AquaMaps. The Irrawaddy dolphin has a 25 – 30 year lifespan Maui’s dolphin has a 20 year lifespan on average although some dolphins may live into their 30’s The Killer whale has a 30 – 50 year lifespan (some killer whales have been estimated to live for over 90 years while captive killer whales have an average lifespan of 25 years or less) The life span of Irrawaddy dolphin is estimated to be 30 to 50 years. These prey entrapments occur slightly below the water surface level. Read more about the Irrawaddy River ecosystem.