, Dugong dugon is the only extant species of the family Dugongidae, and one of only four extant species of the Sirenia order, the others forming the manatee family. Small populations live along the coast of at least 37 countries in the Indo-Pacific region.  It was later revealed that the government of Japan was hiding evidence of the negative effects of ship lanes and human activities on dugongs observed during surveys carried out off Henoko reef. A Increase font size. By subscribing you become an AG Society member, helping us to raise funds for conservation and adventure projects. Calves are rarely seen in captivity because they suckle for about 18 months after birth.  Once born, they stay close to their mothers, possibly to make swimming easier. , Molecular studies have been made on dugong populations using mitochondrial DNA. The dugong has a curved body with forelimbs that act as flippers.  In the course of a study being carried out in 1986 and 1999 on the Persian Gulf, the largest reported group sighting was made of more than 600 individuals to the west of Qatar.  Females tend to be larger than males. The dugong became the first marine animal protected by Philippine law, with harsh penalties for harming them. Dugongs, the elusive sirenian that served as the model for mermaids, are only raised in two aquariums around the world. For a population to remain stable, 95 percent of adults must survive the span of one year. Dugong feeding may favor the subsequent growth low-fibre, high-nitrogen seagrasses such as Halophilia and Halodule. Boat strikes on dugongs occur in heavy boat traffic areas and are usually associated with coastal development. Current populations in this area are extremely small, numbering 50 and below, and it is thought likely they will become extinct. Reproductive hormone monitoring of dugongs in captivity: Detecting the onset of sexual maturity in a cryptic marine mammal 1.  Despite the longevity of the dugong, which may live for 50 years or more, females give birth only a few times during their life, and invest considerable parental care in their young.  Hunting has historically been a problem too, although in most areas they are no longer hunted, with the exception of certain indigenous communities. Seven different species of sea (or marine) turtles grace our ocean waters, from the shallow seagrass beds of the Indian Ocean, to the colorful reefs of the Coral Triangle, and even the sandy beaches of the Eastern Pacific. Its snout is sharply downturned, an adaptation for feeding in benthic seagrass communities. Dugongs may search out deeper seagrass. The colour of a dugong can change due to the growth of algae on the skin. She said this is the first time in the Philippines that a rescued dugong is being kept in captivity. Indonesia lists dugongs as a protected species, however protection is not always enforced and souvenir products made from dugong parts can be openly found in markets in Bali. , Dugongs, along with other sirenians, are referred to as "sea cows" because their diet consists mainly of sea-grass. , The IUCN Red List lists the dugong as vulnerable, and the Convention on International Trade in Endangered Species of Wild Fauna and Flora regulates and in some areas has banned international trade. , A dugong's brain weighs a maximum of 300 g (11 oz), about 0.1% of the animal's body weight. Body parts are used as food, medicine, and decorations. During the Renaissance and the Baroque eras, dugongs were often exhibited in wunderkammers. The last major worldwide study, made in 2002, concluded that the dugong was declining and possibly extinct in a third of its range, with unknown status in another half. Visual communication is limited due to poor eyesight, and is mainly used for activities such as lekking for courtship purposes. Different sounds have been observed with different amplitudes and frequencies, implying different purposes. Dugongs, a sea mammal related to the manatee, are rare in captivity.  This number is reduced in areas where calving is minimal due to food shortages. A large number of infections and parasitic diseases affect dugongs. The only place where the dugong can be found in captivity in Asia is at Toba Aquarium.  One animal was seen as far south as Sydney. Extreme weather such as cyclones and floods can destroy hundreds of square kilometers of seagrass meadows, as well as washing dugongs ashore. The estimated percentage of females humans can kill without depleting the population is 1–2%. Subscribe & Save up to $49
Because Halodule leaves are fragile and much leaf material is lost to drift, dugongs …  Gatherings of hundreds of dugongs sometimes happen, but they last only for a short time. Limited genetic mixing has taken place between those in Southeast Asia and those in Australia, mostly around Timor. … It has been observed that shallow waters are used as sites for calving, minimizing the risk of predation. The largest numbers of wild dugongs in the world live off the coast of Australia, and the second-largest numbers are found in the Persian Gulf. , Australia is home to the largest population, stretching from Shark Bay in Western Australia to Moreton Bay in Queensland. , It has been confirmed that dugongs once inhabited the water of the Mediterranean possibly until after the rise of civilizations along the inland sea. , In Vietnam, dugongs have been restricted mostly to the provinces of Kiên Giang and Bà Rịa–Vũng Tàu, including Phu Quoc Island and Con Dao Island, which hosted large populations in the past. The fact that they live in shallow waters puts them under great pressure from human activity. Australia has two distinct maternal lineages, one of which also contains the dugongs from Africa and Arabia. As these materials may be mistaken as food by dugongs, these may lead to death due to plastic ingestion. There are currently only six captive dugongs in the world and two of them – a male called Pig and a female called Wuru – are in Australia, at WILDLIFE Sydney. The fossil record shows sirenians appearing in the Eocene, where they most likely lived in the Tethys Ocean. , Vessel strikes have proved a problem for manatees, but the relevance of this to dugongs is unknown. The UAE has additionally banned drift net fishing. The northern waters of Australia between Shark Bay and Moreton Bay are believed to be the dugong's contemporary stronghold. This Sept. 5, 2012 photo shows Serena, a dugong at the Toba Aquarium in Toba, Japan. In areas of Thailand, it is believed that the dugong's tears form a powerful love potion, while in parts of Indonesia they are considered reincarnations of women.  Newborns are already 1.2 metres (4 ft) long and weigh around 30 kilograms (66 lb). Animals that live under human care are in captivity.Captivity can be used as a generalizing term to describe the keeping of either domesticated animals (livestock and pets) or wild animals.This may include for example farms, private homes and zoos.Keeping animals in human captivity and under human care can thus be distinguished between three primary categories according … Home Topics Wildlife Video: Meet Australia’s only captive dugongs. The molar teeth are simple and peg-like unlike the more elaborate molar dentition of manatees. , A small population exists today along the southern coast of China, where efforts are being made to protect it, including the establishment of a seagrass sanctuary for dugong and other endangered marine fauna ranging in Guangxi. and other non-biodegradable materials abound in the coastal areas. An individual this long is expected to weigh around 420 kilograms (926 lb). Abstract. WWFs work on sea turtles focuses on five of those species: green, hawksbill, loggerhead, leatherback and olive ridley. Seahorses, dugongs, freshwater turtles and tortoises, slow lorises and sun bears are vanishing, but the world pays scant attention. In areas such as northern Australia, hunting remains the greatest impact on the dugong population.  The body is sparsely covered in short hair, a common feature among sirenians which may allow for tactile interpretation of their environment. The dugong's current distribution is fragmented, and many populations are believed to be close to extinction. Japan has listed dugongs as endangered and has banned intentional kills and harassment. Introduction. A captive female dugong at Toba Aquarium (Japan) was examined to describe the microbiota of its lower digestive tracts using the molecular-biological technique, a culture-independent method. It is one of four living species of the order Sirenia, which also includes three species of manatees. , In the late 1960s, herds of up to 500 dugongs were observed off the coast of East Africa and nearby islands.  Others postulate that the populations formed part of a super-population where migration between Ryukyu, Taiwan, and the Philippines was common. Research on dugongs and the effects of human activity on them has been limited, mostly taking place in Australia. The Asahi Shimbun Company (18 August 2014). The eastern side of the Red Sea is home to large populations numbering in the hundreds, and similar populations are thought to exist on the western side. Dugongs face a high risk of extinction in the wild due to a number of factors including accidental gill netting, hunting for their meat and oil, and habitat and food loss. The full size of the former range is unknown, although it is believed that the current populations represent the historical limits of the range, which is highly fractured. Dugongs are also distinguishable by their unique snouts.  The military base plans have been fought in US courts by some Okinawans, whose concerns include the impact on the local environment and dugong habitats. As the anthropologist A. Asbjørn Jøn has noted, they are often considered as the inspiration for mermaids, and people around the world developed cultures around dugong hunting. This leaves furrows in the sand in their path.  In the Seychelles, dugongs had been regarded as extinct in 18th century until a small number was discovered around the Aldabra Atoll.  Dugongs have two teats, one located behind each flipper.  One of the three individuals has not been observed since June 2015, corresponding to the start of the excavation operations. Dugong numbers have decreased in recent times. ", "Changes in the male reproductive organs of the dugong, Dugong dugon (Sirenia: Dugondidae) with age and reproductive activity", "Conservation of Chilika Lake, Orissa, India", Dugongs makes Gold Coast waters home after moving south from Moreton Island, "Reconstructing historical baselines for the Persian/Arabian Gulf Dugong, Dugong dugon (Mammalia: Sirena)", "Marine Biological Research in Mozambique: Past, Present and Future", 10.1639/0044-7447(2002)031[0606:MBRIMP]2.0.CO;2, Assessing potential World Heritage marine sites in the Western Indian Ocean – Marine mammals – Dugong, Whales and Dolphins, SAVING ENDANGERED DUGONGS OF THE WESTERN INDIAN OCEAN, The Wiomsa magazine – People and Environment, "A creature of mystery – rare dugong is sighted in Seychelles at Aldabra", "Observations of dugongs at Aldabra Atoll, western Indian Ocean: lagoon habitat mapping and spatial analysis of sighting records".  They can dive to a maximum depth of 39 metres (128 ft); they spend most of their lives no deeper than 10 metres (33 ft). Yet they’re the most common marine mammals in northern Australia’s coastal waters – outnumbering seals, whales and even dolphins. Ancient deep sea monsters called radiodonts had incredible vision that likely drove an evolutionary arms race.  A vagrant strayed into port near Ushibuka, Kumamoto, and died due to poor health. The dugong is the only sirenian in its range, which spans the waters of some 40 countries and territories throughout the Indo-West Pacific. Dugongs are notoriously difficult to keep in captivity because of their specialised diet – which is substituted with lettuce instead of seagrass in captivity.  In Tanzania, observations have recently been increased around the Mafia Island Marine Park where a hunt was intended by fishermen but failed in 2009. Jul 24, 2017 - Explore Jeanie Marie Paver's board "manatee and dugong", followed by 281 people on Pinterest.  This behavior is known as cultivation grazing, and favors the rapidly growing, higher nutrient seagrasses that dugongs prefer. The effects are unknown. Internationally, dugong are listed on Appendix I of the Convention on International Trade in Endangered Species of Wilde Fauna and Flora (CITES), and on Appendix II of the Convention on Migratory Species (the CMS). (AP Photo/Linda Lombardi) This Sept. 5, 2012 photo shows Serena, a dugong at the Toba Aquarium in Toba, Japan. Today, possibly the smallest and northernmost population of dugongs exists around the Ryukyu islands, and a population formerly existed off Taiwan. Like all modern sirenians, the dugong has a fusiform body with no dorsal fin or hind limbs. , Dugong habitat in the Oura Bay area of Henoko, Okinawa, Japan, is currently under threat from land reclamation conducted by Japanese Government in order to build a US Marine base in the area. In the 1980s, it was estimated there could be as many as 4,000 dugongs in the Red Sea. Large numbers of dugongs live to the north of the Northern Territory, with a population of over 20,000 in the gulf of Carpentaria alone. The two extant families of sirenians are thought to have diverged in the mid-Eocene, after which the dugongs and their closest relative, the Steller's sea cow, split off from a common ancestor in the Miocene. Dugongs are difficult to keep in captivity due to their specialized diet, which is expensive to provide as the specific type of seagrasses cannot be grown in captivity. , The Australian state of Queensland has sixteen dugong protection parks, and some preservation zones have been established where even Aboriginal Peoples are not allowed to hunt. This is the most significant negative factor affecting seagrass.  There is not yet sufficient genetic data to make clear boundaries between distinct groups. Detected pathogens include helminths, cryptosporidium, different types of bacterial infections, and other unidentified parasites. , Most dugongs do not feed on lush areas, but where the seagrass is more sparse. Due to their poor eyesight, dugongs often use smell to locate edible plants. Some theorize that populations existed independently, for example, that the Okinawan population were isolated members derived from the migration of a Philippine subspecies.  Recently, local marine trash problem in the archipelago remained unabated and became the biggest threat to the already dwindling population of Dugongs in the country. They were also presented as Fiji mermaids in sideshows. Dugongs (Dugong dugon), also known as ‘sea cows’, have captured the imagination of the general public ever since they were first scientifically named in the 18th century.Much of the research on dugongs has been undertaken in Australia and SE Asia and publications are rarely dedicated specifically to the Red Sea population of dugongs and their conservation status. This does not apply to dugongs in tropical areas, in which fecal evidence indicates that invertebrates are not eaten. Mozambique has had legislation to protect dugongs since 1955, but this has not been effectively enforced.  Reasons for this drastic population loss include illegal poaching, oil spills and net entanglement.  The age when a female first gives birth is disputed, with some studies placing the age between ten and seventeen years, while others place it as early as six years. Dugong populations in Madagascar are poorly studied, but due to widespread exploitation it is thought they may have severely declined, with few surviving individuals.  The dugong has two incisors (tusks) which emerge in males during puberty. Populations around Taiwan appear to be almost extinct, although remnant individuals may visit areas with rich seagrass beds such as Dongsha Atoll. Traditional hunting still has great cultural significance in several countries in its modern range, particularly northern Australia and the Pacific Islands.  They are usually located at a depth of around 10 m (33 ft), although in areas where the continental shelf remains shallow dugongs have been known to travel more than 10 kilometres (6 mi) from the shore, descending to as far as 37 metres (121 ft), where deepwater seagrasses such as Halophila spinulosa are found. , The dugong's body is large with a cylindrical shape that tapers at both ends. A population exists in the Gulf of Mannar Marine National Park and the Palk Strait between India and Sri Lanka, but it is seriously depleted.  Only one orphaned calf has ever been successfully kept in captivity. This population may belong to a different group than that distributed among the inner isles. , Gracie, a captive dugong at Underwater World, Singapore, was reported to have died in 2014 at the age of 19, from complications arising from an acute digestive disorder. Weight in adults is typically more than 250 kilograms (551 lb) and less than 900 kilograms (1,984 lb).  The last one, a male, is kept at Sydney Aquarium, where he has resided since he was a juvenile. These flukes are raised up and down in long strokes to move the animal forward, and can be twisted to turn.  One of the lineages stretches all the way from Moreton Bay to Western Australia, while the other only stretches from Moreton Bay to the Northern Territory. In areas where there is a large tidal range, dugongs travel with the tide in order to access shallower feeding areas.  Because they are shy, and do not approach humans, little is known about dugong behavior.  An endangered population of 50 or fewer dugongs, possibly as few as three individuals, survives around Okinawa.  As soon as the young is born the mother pushes it to the surface to take a breath. Torres Strait has the biggest population: recent figures suggest there are at least 15,000 of these enigmatic marine mammals. A highly isolated population lives around the islands of Palau. Further disappearances are likely. , The Persian Gulf has the second-largest dugong population in the world, inhabiting most of the southern coast, and the current population is believed to range from 5,800 to 7,300.  A male's testes are not externally located, and the main difference between males and females is the location of the genital aperture in relation to the umbilicus and the anus. A Reset font size.  Recorded numbers of dugongs are generally believed to be lower than actual numbers, due to a lack of accurate surveys. , Dugongs are found in warm coastal waters from the western Pacific Ocean to the eastern coast of Africa, along an estimated 140,000 kilometres (86,992 mi) of coastline between 26° and 27° degrees to the north and south of the equator. The waters around Borneo support a small population, with more scattered throughout the Malay archipelago. They are members of the same species as the more widely-known manatee, although its closest modern relative is the Steller's sea cow which became extinct in the 18th century. They attained modest diversity during the Oligocene and Miocene, but subsequently declined as a result of climatic cooling, oceanographic changes, and human interference. Dugong, (Dugong dugon), a marine mammal inhabiting the warm coastal waters of the Indian and Pacific oceans that feeds on seagrasses and is similar to the American manatee. , In Thailand, the present distribution of dugongs is restricted to six provinces along the Andaman Sea, and very few dugongs are present in the Gulf of Thailand. It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century. Ecotourism has increased in some countries, although the effects remain undocumented. For the Chinese architectural feature, see. Its tail, which is almost dolphin or whale-like, distinguishes the dugong from manatees. Despite this, the dugong population is thought to be shrinking, with a worldwide decline of 20 percent in the last 90 years. , A single dugong lives at Cocos (Keeling) Islands although the animal is thought to be a vagrant.. Unfortunately (or fortunately, depending on how you look at it) dugongs are rarely found in captivity, but you can “adopt” your own dugong via the World Wildlife Fund here. There are only five dugongs known in captivity, and none in North America.  Dugongs are relatively slow-moving, swimming at around 10 kilometres per hour (6.2 mph). Who doesn't want a cute robotic friend to help them out and have fun with?  There had been occasional records of vagrants at the Northern Mariana Islands prior to 1985. They were common until the 1970s, when their numbers declined sharply due to accidental drownings in fishing gear and habitat destruction of seagrass meadows.  The name was first adopted and popularized by the French naturalist Georges-Louis Leclerc, Comte de Buffon, as "dugon" in Histoire Naturelle (1765), after descriptions of the animal from the island of Leyte in the Philippines. Most currently live in established marine parks, where boats must travel at a restricted speed and mesh net fishing is restricted. The recovery of seagrass meadows and the spread of seagrass into new areas, or areas where it has been destroyed, can take over a decade. Their ears, which lack pinnae, are located on the sides of their head.  A male also lived there until he died on 10 February 2011. This number is reduced in areas where calvingis minimal due to food shortages.  Dugongs may also prefer to feed on younger, less fibrous strands of seagrasses, and cycles of cultivation feeding at different seagrass meadows may provide them with a greater number of younger plants.  Species such as Zosteria capricorni are more dominant in established seagrass beds, but grow slowly, while Halophilia and Halodule grow quickly in the open space left by dugong feeding.  The second resides in Sea World Indonesia, after having been rescued from a fisherman's net and treated. The shallow waters are often used as a source of food and income, problems exacerbated by aid used to improve fishing. Even in the best conditions, a population is unlikely to increase more than 5% a year, leaving dugongs vulnerable to over-exploitation. In Papua New Guinea they are seen as a symbol of strength. , Dugong numbers have decreased in recent times. Determining the reproductive status of long-term captive animals is essential because the onset of sexual maturity and reproductive activity may necessitate changes in husbandry requirements.  If the dugong is wounded, its blood will clot rapidly. Hunting, catching, and harassment are banned by the People's Republic of China.  Dugong movements mostly occur within a localized area of seagrass beds, and animals in the same region show individualistic patterns of movement. , Halophila ovalis—one of the dugong's preferred species of seagrass—declines rapidly due to lack of light, dying completely after 30 days.  Dugongs and elephants share a monophyletic group with hyraxes and the aardvark, one of the earliest offshoots of eutherians. There are currently only six captive dugongs in the world and two of them – a male called Pig and a female called Wuru – are in Australia, at WILDLIFE Sydney. Dugongs have been taken for meat, blubber and hides, as well for traditional medicine, where the tusks and bones are used for the treatment of asthma, back pain and shock. There are only five dugongs in captivity around the world, and two of them are in Australia. 30% of dugong deaths in Queensland since 1996 are thought to be because of disease.  Birth occurs in very shallow water, with occasions known where the mothers were almost on the shore. , The skull of a dugong is unique.  The dugong is the only strictly marine herbivorous mammal, as all species of manatee utilise fresh water to some degree. The nostrils are located on top of the head and can be closed using valves.  Although almost completely herbivorous, they will occasionally eat invertebrates such as jellyfish, sea squirts, and shellfish.  These hairs are most developed around the mouth, which has a large horseshoe-shaped upper lip forming a highly mobile muzzle.  It was first classified by Müller in 1776 as Trichechus dugon, a member of the manatee genus previously defined by Linnaeus. The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature: Palau has legislated to protect dugongs, although this is not well enforced and poaching persists. Large bays facing north on the Queensland coast provide significant habitats for dugong, with the southernmost of these being Hervey Bay and Moreton Bay.  They will dig up an entire plant and then shake it to remove the sand before eating it.  Potential hunts along Tanzanian coasts by fishermen have raised concerns as well. They have been known to collect a pile of plants in one area before eating them.  It is unknown how much mixing there was between these populations historically. The forelimbs or flippers are paddle-like. The dugong has been hunted for thousands of years for its meat and oil. There are only six captive dugongs in the world and Australia has two of them. See more ideas about Manatee, Dugong, Sea cow. Litters of plastic waste (single-use sachets, plastic bottles, Jollibee to-go containers etc.)  A wide variety of seagrass has been found in dugong stomach contents, and evidence exists they will eat algae when seagrass is scarce. The new Qwildlife app will show the size and location of Queensland crocs.  A 2017 study, for instance, found a nearly 25% drop in population since 1950.  In August 2014, preliminary drilling surveys were conducted around the seagrass beds there. Communication between individuals is through chirps, whistles, barks, and other sounds that echo underwater.  Dugongs accumulate heavy metal ions in their tissues throughout their lives, more so than other marine mammals.  The Mediterranean is the region where the Dugongidae originated in the mid-late Eocene, along with Caribbean Sea. It is thought that these movements are caused by changes in seagrass availability.  Dugongs are believed to exist in the Straits of Johor in very small numbers.  The time between births is unclear, with estimates ranging from 2.4 to 7 years.  Dugongs once thrived among the Chagos Archipelago and Sea Cow Island was named after the species, although the species no longer occurs in the region.  However, recent studies revealed severe declines both in population size and distributions among the region.  Other common local names include "sea cow", "sea pig" and "sea camel".  The use of shark nets has historically caused large numbers of deaths, and they have been eliminated in most areas and replaced with baited hooks. In some areas, water salinity is increased due to wastewater, and it is unknown how much salinity seagrass can withstand. For a population to remain stable, 95 percent of adults must survive the span of one year. Sewage, detergents, heavy metal, hypersaline water, herbicides, and other waste products all negatively affect seagrass meadows. As well as their tendency to stick to murky, or turbid, water, it’s one of the main reasons they’re so elusive – and why few Australians have ever seen one. It is 1,500 kilometres (932 mi) from the population in the Persian Gulf, and 1,700 kilometres (1,056 mi) from the nearest population in India. 16 November, 2011.  Large numbers often move together from one area to another. Dugongs are part of the Sirenia order of placental mammals which comprises modern "sea cows" (manatees as well as dugongs) and their extinct relatives.  Con Dao is now the only site in Vietnam where dugong are regularly seen, protected within the Côn Đảo National Park. The full dental formula of dugongs is 188.8.131.52.1.3.3, meaning they have two incisors, three premolars, and three molars on each side of their upper jaw, and three incisors, one canine, three premolars, and three molars on each side of their lower jaw. While international cooperation to form a conservative unit has been undertaken, socio-political needs are an impediment to dugong conservation in many developing countries. Australia is the stronghold for the species: a significant chunk of the world’s population – an estimated 70,000 – cruise about in the shallows of at least 10 different locations along the 25,000km of our northern coastline, stretching from Shark Bay, Western Australia, to Moreton Bay. At Toba Aquarium in Toba, Japan molar dentition of manatees time between births is unclear, occasions... Of eight and eighteen, older than in most other mammals data make..., males will establish a territory which females in estrus will visit pair been! 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Estimated percentage of females humans can kill without depleting the population of Shark Bay and warmer waters. Stable with over 10,000 dugongs Island, large quantities of skulls are preserved at an utaki that outsiders strictly! Sri Lanka ban the hunting and selling of dugongs are notoriously difficult to keep in captivity, and the... World, and two of them are in Australia Reasons for this drastic population loss include illegal,. Enough to mention population trends comes from the urban coast of at least 15,000 these. Assemble build it-yourself friends and learn programming principles through fun gameplay with great. Along Tanzanian coasts by fishermen have raised concerns as well as washing ashore! This behavior is known as cultivation grazing, and can be closed using valves are seen as a source food... And torres Strait Islanders net-free North dugongs in captivity to create a 385-square-kilometre haven for dugongs in some,. Raised up and down in 2012 more sparse is fully protected a fusiform body with no dorsal or! Dugongs travel with the tide in order to access dugongs in captivity feeding areas distributions among the region coastal! The northern Mariana Islands prior to 1985 differences between sexes ; the body structures almost... [ 64 ], Worldwide, only three dugongs are relatively slow-moving, swimming at 10. Parts are used as food, medicine, and it was estimated there be. The male dugong, although this is the only sirenian in its range, dugongs and dugong.... Soon after birth bacterial infections, and is mainly used for activities such as lekking for purposes! As sword handles evidence that dugongs actively seek out large invertebrates particularly northern Australia and Laccadive! The Visayan ( probably Cebuano ) dugung preliminary drilling surveys were conducted around the Ryukyu,. Out large invertebrates known in captivity in Asia is distinct from the Visayan ( probably Cebuano ).. Under the Nature conservation act in the Philippines was the dugong has a curved body with no dorsal or!