Baiji - wikipedia Baiji This article is about the dolphin. For other uses, see Baiji ( disambiguation ). Baiji An illustration of the baiji Size compared to an average human size Conservation status Critically endangered, possibly extinct ( IUCN 3.1 ) Scientific classification Kingdom : Animalia Phylum : Chordata Class : Mammalia Order : Artiodactyla Infraorder : Cetacea Parvorder : Odontoceti Clade : Delphinida Superfamily : Lipotoidea Family : Lipotidae Zhou, Qian & Li, 1978 Genus : Lipotes Miller, 1918 Species : L. vexillifer Binomial name Lipotes vexillifer Miller, 1918 Natural range of the baiji The baiji ( Chinese : 白 鱀 豚 ; pinyin : báijìtún ( help info ), Lipotes vexillifer, Lipotes meaning `` left behind '', vexillifer `` flag bearer '' ) is a functionally extinct species of freshwater dolphin formerly found only in the Yangtze River in China. Nicknamed `` Goddess of the Yangtze '' ( simplified Chinese : 长江 女神 ; traditional Chinese : 長江 女神 ; pinyin : Cháng Jiāng nǚshén ) in China, the dolphin is also called Chinese river dolphin, Yangtze River dolphin, whitefin dolphin and Yangtze dolphin. It was regarded as the goddess of protection by local fishermen and boatmen in China ( Zhou, 1991 ). It is not to be confused with the Chinese white dolphin or the finless porpoise. The baiji population declined drastically in decades as China industrialized and made heavy use of the river for fishing, transportation, and hydroelectricity. It has been credibly claimed, after surveys in the Yangtze River during the 1980s, that baiji could be the first dolphin species in history that humans have driven to extinction. A Conservation Action Plan for Cetaceans of the Yangtze River was approved by the Chinese Government in 2001. Efforts were made to conserve the species, but a late 2006 expedition failed to find any baiji in the river. Organizers declared the baiji functionally extinct. The baiji represents the first documented global extinction of a `` megafaunal '' vertebrate for over 50 years since the demise of the Japanese sea lion and the Caribbean monk seal in the 1950s. It also signified the disappearance of an entire mammal family of river dolphins ( Lipotidae ). The baiji 's extinction would be the first recorded extinction of a well - studied cetacean species ( it is unclear if some previously extinct varieties were species or subspecies ) to be directly attributable to human influence. Swiss economist and CEO of the baiji.org Foundation, August Pfluger funded the expedition, in which an international team, taken in part from the National Oceanic and Atmospheric Administration and the Fisheries Research Agency in Japan, searched for six weeks for signs of the dolphin. The search took place almost a decade after the last exploration in 1997, which turned up only 13 of the cetaceans. In August 2007, a Chinese man reportedly videotaped a large white animal swimming in the Yangtze. Although it was tentatively confirmed that the animal on the video is probably a baiji, the presence of only one or a few animals, particularly of advanced age, is not enough to save a functionally extinct species from true extinction. The last known living baiji was Qiqi ( 淇 淇 ), who died in 2002. The World Wildlife Fund is calling for the preservation of any possible baiji habitat, in case the species is located and can be revived. A related species from the Neogene is Parapontoporia. Contents 1 Anatomy and morphology 2 Distribution 3 Evolutionary history 4 Folklore 5 Conservation 5.1 Causes of decline 5.2 Timeline 5.3 Surveys 5.4 Conservation efforts 5.4. 1 In situ conservation 5.4. 2 Ex-situ conservation 5.4. 3 Captive specimens 5.5 Current status 6 See also 7 References 8 External links 8.1 News Anatomy and morphology Baiji were thought to breed in the first half of the year, the peak calving season being from February to April. A 30 % pregnancy rate was observed. Gestation would last 10 -- 11 months, delivering one calf at a time ; the interbirth interval was 2 years. Calves measured around 80 -- 90 centimetres ( 31 -- 35 in ) at birth, and nursed for 8 -- 20 months. Males reached sexual maturity at age four, females at age six. Mature males were about 2.3 metres ( 7 ft 7 in ) ( 7.5 ft ) long, females 2.5 metres ( 8 ft 2 in ), the longest specimen 2.7 metres ( 8 ft 10 in ). The animal weighed 135 -- 230 kilograms ( 298 -- 507 lb ), with a lifespan estimated at 24 years in the wild. The Yangtze River Dolphin is pale blue to gray on the dorsal ( back ) side, and white on the ventral ( belly ) side. It has a long and slightly - upturned beak with 31 -- 36 conical teeth on either jaw. Its dorsal fin is low and triangular in shape and resembles a light - colored flag when the dolphin swims just below the surface of the murky Yangtze River, hence the name `` white - flag '' dolphin. It has smaller eyes compared to oceanic dolphins. When escaping from danger, the baiji can reach 60 km / h ( 37 mph ), but usually stays within 30 to 40 km / h ( 19 to 25 mph ). Because of its poor vision, the baiji relies primarily on sonar for navigation. The sonar system also plays an important role in socializing, predator avoidance, group coordination, and expressing emotions. Sound emission is focused and highly directed by the shape of the skull and melon. Peak frequencies of echolocation clicks are between 70 kHz and 100 kHz. Distribution Historically the baiji occurred along 1,700 kilometres ( 1,100 mi ) of the middle and lower reaches of the Yangtze from Yichang in the west to the mouth of the river, near to Shanghai, as well as in Poyang and Dongting lakes, and the smaller Qiantang river to the south. This had been reduced by several hundred kilometres both upstream and downstream, and was limited to the main channel of the Yangtze, principally the middle reaches between the two large tributary lakes, Dongting and Poyang. Approximately 12 % of the world 's human population lives and works within the Yangtze River catchment area, putting pressure on the river. The construction of the Three Gorges Dam, along with other smaller damming projects, also led to habitat loss. Evolutionary history Fossil records suggest that the dolphin first appeared 25 million years ago and migrated from the Pacific Ocean to the Yangtze River 20 million years ago. It was one of four species of dolphins known to have made fresh water their exclusive habitat. The other five species, including the boto and the La Plata dolphin, have survived in the Río de la Plata and Amazon rivers in South America and the Ganges and Indus rivers on the Indian subcontinent. It is estimated that there were 5,000 baiji when they were described in the ancient dictionary Erya circa 3rd century BC. It is well known the river dolphins are not a natural group. Their mitochondrial genome reveals a split of two separate lineages, Platanista and Lipotes + ( Inia + Pontoporia ), having no sister relationship with each other, and the Platanista lineage is always within the odontocete clade instead of having a closer affinity to Mysticeti. The position of the Platanista is more basal, suggesting separate divergence of this lineage well before the other one. The Lipotes has a sister relationship with Inia + pontoporia, and they together formed the sister group to the Delphinoidea. This result strongly supports paraphyly of the classical river dolphins, and the nonplatanistoid river dolphins do represent a monophyletic grouping, with the Lipotidae as the sister taxa to ( Iniidae + Pontoporiidae ), and is well congruent with the studies based on short interspersed repetitive elements ( SINEs ). Low values of haplotype diversity and nucleotide diversity were found for the baiji of the Yangtze River. The analysis of molecular variance ( AMOVA ) supported a highlevel of overall genetic structure. The males having a higher genetic differentiation than the females suggested a significant female -- biased dispersal. The aquatic adaptations of the baiji and other cetaceans have happened slowly and can be linked to PSGs and / or other functional changes. Comparative genopic analyses have uncovered that the baiji have a slow molecular clock and molecular adaptations to their aquatic environment. This information leads scientists to conclude that a bottleneck must have occurred near the end of the last deglaciation, a time that coincided with rapid temperature decrease and a rise in eustatic sea level. Scientists have also looked into positively selected genes ( PSGs ) in the baiji genome which are used for DNA repair and response to DNA stimulus. These PSGs have not been found previously in any other mammal species. Pathways being used for DNA repair have been known to have a major impact on brain development and have been implicated in diseases including microcephaly. The slow down of the substitution rate among cetaceans may have been affected by the evolution of DNA damage pathways. Over time, river dolphins, including the baiji, have had a reduction in the size of their eyes and the acuity of their vision. This probably stems from poor visibility in fluvial and estuarine environments. When analyzing the baiji genome, scientists have found that there are four genes that have lost their function due to a frameshift mutation or premature stop codons. The baiji has the lowest single nucleotide polymorphism ( SNP ) frequency reported thus far among mammals. This low frequency could be related to the relatively low rate of molecular evolution in cetaceans ; however, considering that the decrease in the rate of molecular evolution in the baiji was not as great as the decrease in heterozygosity rate, it is likely that much if the low genetic diversity observed was caused by the precipitous decline in the total baiji population in recent decades and the associated breedings. The reconstructed demographic history over the last 100,000 years featured a continual population contraction through the last glacial maximum, a serious bottleneck during the last deglaciation, and sustained population growth after the eustatic sea level approached the current levels. The close correlation between population trends, regional temperatures, and eustatic sea levels suggest a dominant role for global and local climate changes in shaping the baiji 's ancient population demography. Folklore Per Chinese folklore, a beautiful young girl is said to have lived with her stepfather on the banks of the river Yangtze. He was evil, and a greedy man out for his own self - interest. One day, he took the girl on a boat, intending to sell her on the market. Out on the river, though, he became infatuated with her beauty and tried to take advantage of her. But she freed herself by plunging into the river whereupon a big storm came and sank the boat. After the storm had thus settled, people saw a beautiful dolphin swimming -- the incarnation of the girl -- which became known as the ' Goddess of the Yangtze. ' The baiji, in the region of Yangtze, is regarded as a symbol of peace and prosperity. Conservation In the 1950s, the population was estimated at 6,000 animals, but declined rapidly over the subsequent five decades. Only a few hundred were left by 1970. Then the number dropped down to 400 by the 1980s and then to 13 in 1997 when a full - fledged search was conducted. Now the most endangered cetacean in the world, according to the Guinness Book of World Records, the baiji was last sighted in August 2004, though there was a possible sighting in 2007. It is listed as an endangered species by the U.S. government under the Endangered Species Act. It is now thought to be extinct. Causes of decline See also : Yangtze River § Degradation of the river, and Water pollution in China The World Conservation Union ( IUCN ) has noted the following as threats to the species : a period of hunting by humans during the Great Leap Forward, entanglement in fishing gear, the illegal practice of electric fishing, collisions with boats and ships, habitat loss, and pollution. Further studies have noted that a lack of information on the baiji 's historical distribution or ecology, the environmental impact of the construction of the Three Gorges Dam on the living space of the baiji, and the failure to act for the protection of the baiji are also threats to the species. During the Great Leap Forward, when traditional veneration of the baiji was denounced, it was hunted for its flesh and skin, and quickly became scarce. As China developed economically, pressure on the river dolphin grew significantly. Industrial and residential waste flowed into the Yangtze. The riverbed was dredged and reinforced with concrete in many locations. Ship traffic multiplied, boats grew in size, and fishermen employed wider and more lethal nets. Noise pollution caused the nearly blind animal to collide with propellers. Stocks of the dolphin 's prey declined drastically in the late 20th century, with some fish populations declining to one thousandth of their pre-industrial levels. A range of anthropogenic led causes ( e.g. boat collisions, dam construction ) which also threaten freshwater cetaceans in other river systems, have been implicated in the decline of the baiji population. However, the primary factor was probably unsustainable by - catch in local fisheries, which use rolling hooks, nets ( gill nets and fyke nets ) and electrofishing ; similarly by - catch constitutes the principal cause of mortality in many populations of small cetaceans worldwide. Although there are relatively few data available on baiji mortality, at least half of all known baiji deaths in the 1970s and 1980s were caused by rolling hooks and other fishing gear, and electrofishing accounted for 40 % of baiji deaths recorded during the 1990s. Unlike most historical - era extinctions of large - bodied animals, the baiji was the victim not of active persecution but of incidental mortality resulting from massive - scale human environmental impacts, primarily uncontrolled fishing. Its extinction merely reflects the latest stage in the progressive ecological deterioration of the Yangtze region. In the 1970s and 1980s, an estimated half of baiji deaths were attributed to entanglement in fishing gear and nets. By the early 2000s, electric fishing was considered `` the most important and immediate direct threat to the baiji 's survival. '' Though outlawed, this fishing technique is widely and illegally practiced throughout China. The building of the Three Gorges Dam further reduced the dolphin 's habitat and facilitated an increase in ship traffic ; these were thought to make it extinct in the wild. There are some scientists who have found that pollution has resulted in emerging diseases caused by paracitic infection in the Baiji population. The Baiji 's reliance on aquatic environments could have resulted in interaction with both terrestrial and marine pathogen risks. Since the Baiji has a limited distribution endemic to the Yangtze River, the freshwater environment may have a higher pathogen level than marine waters ( although systematic environmental studies have yet to be conducted ). The pathogens in these waters could lead to viral infections that can result in epizootics, which has caused the deaths of thousands of marine mammals over the last twenty years. There have also been captured / killed individuals that have had helminth infestations in the stomach which leads scientists to believe that parasitic infections could be another cause of decline amongst the Baiji. It has been noted, however, that the declining geographical range that baiji have been spotted in is not connected to the population loss of baiji. A model provided by Yangtze fishing communities show that the baiji population was not connected by geographical range or fragmentation of location, as the baiji make long - term and periodic movements throughout several years. The movements of the baiji left the species unaffected by dwindling geographical range. Timeline This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( December 2017 ) circa 3rd century BC : population estimated at 5,000 animals 1950s : population was estimated at 6,000 animals 1958 -- 1962 : The Great Leap Forward denounces the animal 's traditional venerated status 1970 : The Gezhouba Dam project begins 1979 : The People 's Republic of China declares the Chinese river dolphin endangered 1983 : National law declares hunting the Chinese river dolphin illegal 1984 : The plight of the baiji draws headlines in China 1986 : Population estimated to be 300 1989 : Gezhouba Dam complete 1990 : Population estimated to be 200 1994 : Construction of the Three Gorges Dam begins 1996 : IUCN lists the species as critically endangered 1997 : Population estimated to be less than 50 ( 13 found in survey ) ; a dead baiji was found with 103 open wounds 1998 : 7 found in survey 2003 : Three Gorges Dam begins filling reservoir 2004 : Last confirmed sighting 2006 : None found in survey, declared `` extinct '' 2007 : Results of survey published in the journal Biology Letters. Surveys Results of Yangtze River baiji surveys between 1979 and 1996 ( * Lower reaches only ) Year Survey Area No. of km surveyed No. of baiji sighted No. of baiji estimated 1979 Wuhan - Chenglingji 230 19 -- 1979 Nanjing - Taiyangzhou 170 10 -- 1979 -- 1981 Nanjing - Guichi 250 3 -- 6 groups 400 1978 -- 1985 Yichang - Nantong 1600 > 20 groups 156 1985 -- 1986 Yichang - Jiangyin 1510 42 groups 300 1979 -- 1986 Fujiangsha - Hukou 630 78 -- 79 100 * 1987 -- 1990 Yichang - Shanghai 1669 108 200 1989 -- 1991 Hukou - Zhenjian 500 29 120 1991 -- 1996 Xinchang - Wuhan 413 42 < 10 Conservation efforts During the 1970s, China recognized the precarious state of the river dolphin. The government outlawed deliberate killing, restricted fishing, and established nature reserves. In 1978, the Chinese Academy of Sciences established the Freshwater Dolphin Research Centre ( 淡水 海豚 研究 中心 ) as a branch of the Wuhan Institute of Hydrobiology. In the 1980s and 1990s, several attempts were made to capture dolphins and relocate them to a reserve. A breeding program would then allow the species to recover and be reintroduced to the Yangtze after conditions improve. However, capturing the rare, quick dolphins proved to be difficult, and few captives survived more than a few months. The first Chinese aquatic species protection organisation, the Baiji Dolphin Conservation Foundation of Wuhan ( 武汉 白 鱀 豚 保护 基金 ), was founded in December 1996. It has raised 1,383,924.35 CNY ( about 100,000 USD ) and used the funds for in vitro cell preservation and to maintain the baiji facilities, including the Shishou Sanctuary that was flooded in 1998. Conservation efforts of the baiji along the Yangtze River Since 1992 five protected areas of the Yangtze have been designated as baiji reserves. Four were built in the main Yangtze channel where baiji are actively protected and fishing is banned : two national reserves ( Shishou City and Xin - Luo ) and two provincial ( Tongling and Zhenjiang ). In the past 20 years, five nature reserves have been established along the river. Imposing maximum prohibition of harmful and illegal fishing methods in the reserves might prolong the process of extinction of these cetaceans in the wild, but so far, the administrative measures taken in the reserves have not yet kept the baiji population from sharply declining. As humans continue to occupy the river and use the natural resources it provided, the question as to whether the river itself can reach a point later in the future to become a habitat for these species to live in once again remained, for the most part, unanswered by conversationalists. In Shishou, Hubei Province, and Tongling, Anhui Province, the two semi-natural reserves established in these regions aimed to build in an environment for the baiji, as well as another mammalian species, the finless porpoise, to breed. Through careful management, both these species not only survived, but did in fact reproduced successfully enough to provide some hope that the Baiji may be able to make a comeback. The fifth protected area is an isolated oxbow lake located off of the north bank of the river near to Shishou City : the Tian - e-Zhou Oxbow Semi-natural Reserve. Combined, these five reserves cover just over 350 kilometres ( 220 mi ), about 1 / 3 of the baijis range, leaving two - thirds of the species ' habitat unprotected. As well as these five protected areas there are also five `` Protection Stations '' in Jianli, Chenglingji, Hukou, Wuhu and Zhengjiang. These stations consist of two observers and a motorized fishing boat with the aim of conducting daily patrols, making observations and investigating reports of illegal fishing. In 2001 the Chinese government approved a Conservation Action Plan for Cetaceans of the Yangtze River. This plan re-emphasised the three measures identified at the 1986 workshop and was adopted as the national policy for the conservation of the Baiji. Despite all of these workshops and conventions little money was available in China to aid the conservation efforts. It has been estimated that US $1 million was needed to begin the project and maintain it for a further 3 years. Efforts to save the mammals proved to be too little and too late. August Pfluger, chief executive of the Baiji.org Foundation, said, `` The strategy of the Chinese government was a good one, but we did n't have time to put it into action. '' Furthermore, the conservation attempts have been criticized, as even with the international attention about the need for conservation for the baiji, the Chinese government did not `` ( make ) any serious investment '' to protect the baiji. In situ conservation Most scientists agreed that the best course of action was an ex-situ effort working in parallel with an in situ effort. The deterioration of the Yangtze River had to be reversed to preserve the habitat. The ex-situ projects aimed to raise a large enough population over time so that some, if not all, of the dolphins could be returned to the Yangtze, so the habitat within the river had to be maintained anyway. Ex-situ conservation The Shishou Tian - e-Zhou is a 21 - kilometre ( 13 mi ) long, 2 - kilometre ( 1.2 mi ) wide oxbow lake located near Shishou City in Hubei Province. Shishou has been described as being `` like a miniature Yangtze... possessing all of the requirements for a semi-natural reserve ''. From the designation as a national reserve in 1992 it has been intended to be used for not only the baiji but also the Yangtze finless porpoise. In 1990 the first finless porpoises were relocated to the reserve and since then have been surviving and reproducing well. As of April 2005 26 finless porpoises were known to live in the reserve. A baiji was introduced in December 1995, but died during the summer flood of 1996. To deal with these annual floods a dyke was constructed between the Yangtze and Shishou. Now water is controlled from a sluice gate located at the downstream mouth of the oxbow lake. It has been reported that since the installation of this sluice gate, water quality has declined since no annual transfer of nutrients can occur. Roughly 6,700 people live on the ' island ' within the oxbow lake and so some limited fishing is permitted. The success of Shishou with the porpoises and with migratory birds and other wetland fauna encouraged the local Wetlands Management Team to put forward an application to award the site Ramsar status. It has also been noted that the site has incredible potential for ecotourism, which could be used to generate much needed revenue to improve the quality of the reserve. The necessary infrastructure does not currently exist to realize these opportunities. Captive specimens A baiji conservation dolphinarium was established at the Institute of Hydrobiology ( IHB ) in Wuhan in 1992. This was planned as a backup to any other conservation efforts by producing an area completely protected from any threats, and where the baiji could be easily observed. The site includes an indoor and outdoor holding pool, a water filtration system, food storage and preparation facilities, research labs and a small museum. The aim is to also generate income from tourism which can be put towards the baiji plight. The pools are not very large ( 25 metres ( 82 ft ) arc ( kidney shaped ) x 7 metres ( 23 ft ) wide x 3.5 metres ( 11 ft ) deep, 10 metres ( 33 ft ) diameter, 2 metres ( 6 ft 7 in ) deep and 12 metres ( 39 ft ) diameter, 3.5 metres ( 11 ft ) deep ) and so are not capable of holding many baijis at one time. Douglas Adams and Mark Carwardine documented their encounters with the endangered animals on their conservation travels for the BBC programme Last Chance to See. Through firsthand experience, they went to China, drinking Baiji beer and Baiji cola, staying in the Baiji Hotel and using Lipotes vexillifer toilet paper. They came across Baiji weighing scales and Baiji fertilizer. They met Qi Qi, the beautiful bluish - grey dolphin with a long, narrow, slightly upturned beak, a low triangular dorsal fin, broad flippers with tiny eyes. Qi - Qi was just a year old then, injured by fishing hooks in 1980 and taken into captivity to be nursed back to health. Out of the seven times Mark and Douglas had visited China, never did they encounter a wild and free Yangtze river dolphin. It is even more impossible now with the likelihood that Lipotes vexillfer may be the first cetacean to have been driven to extinction by human activity. The book by the same name, published in 1990, included pictures of a captive specimen, a male named Qi Qi ( 淇 淇 ) that lived in the Wuhan Institute of Hydrobiology dolphinarium from 1980 to July 14, 2002. Discovered by a fisherman in Dongting Lake, he became the sole resident of the Baiji Dolphinarium ( 白 鱀 豚 水族 馆 ) beside East Lake. A sexually mature female was captured in late 1995, but died after half a year in 1996 when the Tian - e-Zhou Oxbow Nature Reserve ( 石 首 半 自然 白 鱀 豚 保护 区 ), which had contained only finless porpoises since 1990, was flooded. Details of captive baijis ( IHB = Institute of Hydrobiology, NNU = Nanjing Normal University, NFRI = Nanjing Fisheries Research Institute ) Name Date range Location Sex Conditions of rearing Survival time Qi Qi 1980 - 01 - 12 -- 2002 - 07 - 14 IHB Outdoor & indoor, non-filtered 22.5 years Rong Rong 1981 - 04 - 22 -- 1982 - 02 - 03 IHB Outdoor non-filtered 228 days Lian Lian 1986 - 03 - 31 -- 1986 - 06 - 14 IHB Outdoor non-filtered 76 days Zhen Zhen 1986 - 03 - 31 -- 1988 - 09 - 27 IHB Outdoor non-filtered 2.5 years Su Su 1981 - 03 - 03 -- 1981 - 03 - 20 NNU Indoor 17 days Jiang Jiang 1981 - 12 - 07 -- 1982 - 04 - 16 NFRI Outdoor non-filtered 129 days Current status See also : Yangtze Freshwater Dolphin Expedition 2006 The Xinhua News Agency announced on December 4, 2006 that no Chinese river dolphins were detected in a six - week survey of the Yangtze River conducted by 30 researchers. The failure of the Yangtze Freshwater Dolphin Expedition ( simplified Chinese : 长江 淡水 豚 类 考察 ; traditional Chinese : 長江 淡水 豚 類 考察 ; pinyin : Chāng Jiāng dànshuǐ túnlèi kǎochá ) raised suspicions of the first unequivocal extinction of a cetacean species due to human action ( some extinct baleen whale populations might not have been distinct species ). Poor water and weather conditions may have prevented sightings, but expedition leaders declared it `` functionally extinct '' on December 13, 2006, as fewer are likely to be alive than are needed to propagate the species. However, footage believed to be a baiji from August 2007 was released to the public. The Japanese sea lion and Caribbean monk seal disappeared in the 1950s, the last aquatic mammals to become extinct. Several land - based mammal species and subspecies have disappeared since then. If the baiji is now extinct, the vaquita has become the most endangered marine mammal species. Some scientists retain hope for the species : `` The fact that the expedition did n't see any baiji dolphins during this expedition does not necessarily mean that the species is extinct or even ' effectively extinct ', because it covered a considerable distance in a relatively short period of time... However, we are extremely concerned. The Yangtze is highly degraded, and we spotted dramatically fewer finless porpoises than we have in the past. '' -- Wang Limin, director of the World Wide Fund for Nature, Wuhan office A report of the expedition was published online in the journal Biology Letters on August 7, 2007, in which the authors conclude `` We are forced to conclude that the baiji is now likely to be extinct, probably due to unsustainable by - catch in local fisheries ''. `` Witness to Extinction : How We Failed To Save The Yangtze River Dolphin '', an account of the 2006 baiji survey by Samuel Turvey, the lead author of the Biology Letters paper, was published by Oxford University Press in autumn 2008. This book investigated the baiji 's probable extinction within the wider - scale context of how and why international efforts to conserve the species had failed, and whether conservation recovery programmes for other threatened species were likely to face similar potentially disastrous administrative hurdles. Some reports suggest that information about the baiji and its demise is being suppressed in China. Other reports cite government media English language reports in China Central Television and Xinhua News Agency as evidence to the contrary. In August 2007, Zeng Yujiang reportedly videotaped a large white animal swimming in the Yangtze in Anhui Province. Wang Kexiong of the Institute of Hydrobiology of the Chinese Academy of Sciences has tentatively confirmed that the animal on the video is a baiji. On October 3, 2011 the sighting of almost 20 porpoises was reported in Chinese media. The sighting was done from a bridge in Nanjing city. It should be noted however, that the sighting has not been confirmed by independent media sources. On October 11, 2007, Chinese state media announced that under a development plan an additional 4,000,000 people will be relocated from their homes near the dam by the year 2020 due to ecological concerns, while a forum of officials and experts warned of a possible `` environmental catastrophe '' if preventive measures are not taken. Currently, the quality of water in the Yangtze is falling rapidly, due to the dam 's preventing dispersal of pollutants ; algae blooms have risen progressively since the dam 's construction ; and soil erosion has increased, causing riverbank collapses and landslides. The report detailing this was officially released in September 2007. Senior Chinese government officials and scholars said the dam could cause a `` huge disaster... if steps are not taken promptly. '' The same scholars and officials previously had defended the Three Gorges Dam project. Xinhua also reported that tens of billions of yuan had been spent to prevent pollution and geological disasters by tree planting, measures to maintain species diversification, shutting down 1,500 polluting industrial and mining enterprises and building 70 sewage and waste treatment plants, all of which are `` progressing well. '' In October 2016 several news sources announced a recent sighting of what has been speculated to be a baiji. 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T12119A3322533. doi : 10.2305 / IUCN. UK. 2008. RLTS. T12119A3322533. en. Retrieved 29 August 2016. Jump up ^ `` Last Chance for China 's Dolphin ''. BBC News. June 27, 2006. Archived from the original on July 6, 2006. Retrieved June 27, 2006. Jump up ^ Turvey, S.T. ; Rovbert, P.L. ; Taylor, B.L. ; Barlow, J. ; Akamatsu, T. ; Barrett, L.A. ; Zhao, X. ; Reeves, R.R. ; Stewart, B.S. ; Wang, K. ; Wei, Z. ; Zhang, X. ; Pusser, L.T. ; Richlen, M. ; Brandon, J.R. ; Wang D. ( 2007 ). `` First human - caused extinction of a cetacean species ? ''. Biology Letters. 3 ( 5 ) : 537 -- 540. doi : 10.1098 / rsbl. 2007.0292. PMC 2391192. PMID 17686754. Jump up ^ Xu, S ; Ju, J ; Zhou, X ; Wang, L ; Zhou, K ; et al. ( 2012 ). `` Considerable MHC Diversity Suggests That the Functional Extinction of Baiji Is Not Related to Population Genetic Collapse ''. PLoS ONE. 7 ( 1 ) : e30423. doi : 10.1371 / journal. pone. 0030423. PMC 3260281. PMID 22272349. Jump up ^ Turvey, Samuel T. ; Barrett, Leigh A. ; Hart, Tom ; Collen, Ben ; Hao Yujiang ; Zhang Lei ; Zhang Xinqiao ; Wang Xianyan ; Huang Yadong ; Zhou Kaiya ; Wang Ding ( October 22, 2010 ). `` Spatial and temporal extinction dynamics in a freshwater cetacean ''. Proceedings of the Royal Society B : Biological Sciences. Royal Society. 277 : 3139 -- 3147. doi : 10.1098 / rspb. 2010.0584. JSTOR 20780101. Jump up ^ Adams, Douglas. Last Chance to See. Jump up ^ `` Rare river dolphin ' now extinct ' ''. BBC News. August 8, 2007. Jump up ^ Chen, P. ; Liu, P. ; Liu, R. ; Lin, K. ; Pilleri, G. ( 1980 ). `` Distribution, ecology, behaviour and protection of the dolphins in the middle reaches of the Changjiang River ( Wuhan - Yueyang ) ''. Oceanologica Limnologia Sinica. 11 : 73 -- 84. Jump up ^ Zhou, K. ; Pilleri, G. ; Li, Y. ( 1980 ). `` Observations on baiji ( Lipotes vexillifer ) and finless porpoise ( Neophocaena asiaorientalis ) in the lower reaches of the Chiang Jiang ''. Scientia Sinica. 23 : 785 -- 795. Jump up ^ Zhou, K. ; Li, Y. ; Nishiwaki, M. ; Kataoka, T. ( 1982 ). `` A brief report on observations of the baiji ( Lipotes vexillifer ) in the lower reaches of the Yangtze River between Nanjing and Guichi ''. Acta Theriologica Sinica. 2 : 253 -- 254. Jump up ^ Lin, K. ; Chen, P. ; Hua, Y. ( 1985 ). `` Population size and conservation of Lipotes vexillifer ''. Acta Zoologica Sinica. 5 : 77 -- 85. Jump up ^ Chen, P. & Hua, Y. ( 1989 ) `` Distribution, population size and protection of Lipotes vexillifer '', pp. 78 -- 81 in W.F. Perrin, R.L. Brownell, Jr., K. Zhou and J. Liu ( eds. ) Biology and conservation of the river dolphins. Occasional Papers of the IUCN Species Survival Commission, No. 3. Jump up ^ Zhou, K. and Li, Y. ( 1989 ). `` Status and aspects of the ecology and behaviour of the baiji ( Lipotes vexillifer ) in the lower Yangtze River '', pp. 86 -- 91 in W.F. Perrin, R.L. Brownell Jr., K. Zhou and J. Liu ( eds. ) Biology and conservation of the river dolphins. IUCN Species Survival Commission Occasional Paper 3. Jump up ^ Chen, P. ; Zhang, X. ; Wei, Z. ; Zhao, Q. ; Wang, X. ; Zhang, G. ; Yang, J. ( 1993 ). `` Appraisal of the influence upon baiji, Lipotes vexillifer by the Three - gorge Project and conservation strategy ''. Acta Hydrobiologica Sinica. 17 : 101 -- 111. Jump up ^ Zhou, K. ; Sun, J. ; Gao, A. ( 1993 ). `` Photo - identification and population monitoring of the baiji ( Lipotes vexillifer ) on the lower Yangtze ''. Working paper presented to Baiji Population and Habitat Viability Workshop, Nanjing, China. June 1 -- 4, 1993. Jump up ^ Zhou, K. ; Sun, J. & Gao, A. ( 1993 ). `` The population status of the baiji in the lower reaches of the Yangtze ''. Working paper presented to Baiji Population and Habitat Viability Workshop, Nanjing, China. June 1 -- 4, 1993. Jump up ^ Wang, D. ; Zhang, X. ; Liu, R. ( 1998 ). `` Conservation status and the future of baiji and finless porpoise in the Yangtze River of China ''. Report on the eight international symposium on river and lake environments. ISRLE'96, Wuhan, China. Jump up ^ Wang, K. ; Wang, D. ; Zhang, X. ; Pfluger, A. ; Barrett, L. ( 2006 ). `` Range - wide Yangtze freshwater dolphin expedition : The last chance to see Baiji ? ''. Environmental Science and Pollution Research. 13 ( 6 ) : 418 -- 424. doi : 10.1065 / espr2006. 10.350. PMID 17120833. Jump up ^ `` Conservation of the Yangtze River Dolphin : Emergency Implementation Meeting '' ( PDF ). Archived from the original ( PDF ) on June 19, 2007. Retrieved December 30, 2006. Jump up ^ `` INTERVIEW - Chinese river dolphin almost certainly extinct ''. Reuters AlertNet. December 13, 2006. Archived from the original on January 2, 2007. Retrieved December 30, 2006. Jump up ^ Reeves, Randall R. ; Gales, Nicholas J. ( 2006 ). `` Realities of Baiji Conservation ''. Conservation Biology. 20 ( 3 ) : 626 -- 628. doi : 10.1111 / j. 1523 - 1739.2006. 00472. x. PMID 16909545. Jump up ^ `` Responsible Ecotourism at Tian - e-Zhou Oxbow Nature Reserve ''. baiji.org. Archived from the original on June 17, 2007. Retrieved December 3, 2006. Jump up ^ Carwardine, M ( 2007 ). `` The baiji : So long and thanks for all the fish ''. New Scientist. 195 : 50 -- 53. doi : 10.1016 / s0262 - 4079 ( 07 ) 62350 - 1. Jump up ^ `` Rare Yangtze dolphin may be extinct ''. Archived from the original on January 7, 2007. Retrieved December 5, 2006. Jump up ^ `` Chinese River Dolphin ( Baiji ) Feared Extinct, Hope Remains for Finless Porpoise ''. WWF. December 15, 2006. Retrieved December 15, 2006. Jump up ^ Turvey, Samuel T. ; Pitman, Robert L. ; Taylor, Barbara L. ; Barlow, Jay ; Akamatsu, Tomonari ; Barrett, Leigh A. ; Zhao, Xuijiang ; Reeves, Randall R. ; Stewert, Brent S. ; Wang, Kexiong ; Wei, Zhuo ; Zhang, Xianfeng ; Pusser, L.T. ; Richlen, Michael ; Brandon, John R. & Wang, Ding ( August 7, 2007 ). `` First human - caused extinction of a cetacean species ? ''. Biology Letters. Royal Society Publishing. 3 ( 5 ) : 537 -- 40. doi : 10.1098 / rsbl. 2007.0292. PMC 2391192. PMID 17686754. Retrieved August 8, 2007. Jump up ^ `` R.I.P. Yangtse River Dolphin -- Null Hypothesis ''. null-hypothesis.co.uk. Jump up ^ `` Endemic dolphin `` extinction '' mirrors Yangtze health decline ``. Xinhua. January 21, 2010. Jump up ^ `` Extinct '' white - flag dolphin spotted in Yangtze River. news.xinhuanet.com. August 29, 2007 Jump up ^ `` 南京 市民 发现 近 20 头 江豚 现 身 长江 大桥 下 ''. October 3, 2010. Jump up ^ `` Millions forced out by China dam ''. BBC News. October 13, 2007. Retrieved October 13, 2007. Jump up ^ `` Millions more face relocation from Three Gorges Reservoir Area ''. Xinhua News Agency. October 11, 2007. Retrieved October 14, 2007. Jump up ^ `` China warns of environmental `` catastrophe '' from Three Gorges Dam ``. Xinhua News Agency. September 26, 2007. Retrieved October 14, 2007. ^ Jump up to : Yang, Lin ( October 12, 2007 ). `` China 's Three Gorges Dam Under Fire ''. Time. Jump up ^ `` MWC News -- A Site Without Borders -- -- China dam to displace millions more ''. Mwcnews.net. Archived from the original on October 23, 2008. Retrieved November 9, 2008. ^ Jump up to : Toy, Mary - Anne `` Three Gorges Dam ' could be huge disaster ' '', theage.com.au. September 27, 2007. Jump up ^ Yao, Christy. `` China 's ' extinct ' dolphin may have returned to Yangtze river, say conservationists ''. The Guardian. Guardian News and Media Limited. Retrieved 12 October 2016. External links Wikimedia Commons has media related to Lipotes vexillifer. Wikispecies has information related to Lipotes vexillifer US National Marine Fisheries Service baiji web page ARKive -- images and movies of the baiji ( Lipotes vexillifer ) Lipotes vexillifer -- EDGE of Existence `` Baiji Blog '' -- EDGE of Existence The Baiji Foundation -- Networking Expertise for Conservation of Freshwater Biodiversity The Nature Conservancy 's Species Profile : Yangtze Dolphin Animal Info page on baiji `` Lipotes vexillifer : Baiji or Chinese River Dolphin '' ( cetacea.org ) at the Wayback Machine ( archived March 5, 2005 ) whale-web.com U.S. Fish & Wildlife Service Species Profile Lipotes vexillifer, Endangered and Protected Species Database of Chinese Animals uBio Namebank entry Online documentary about Yangtze River Dolphin -- Whale Trackers World Wide Fund for Nature ( WWF ) -- species profile for River Dolphins Save the Baji Photos in Hudong News Null Hypothesis `` R.I.P. Yangtse River Dolphin '' BBC News `` Last chance for China 's dolphin '' BBC News `` Failure in Yangtze dolphin search '' The Baiji Foundation `` Hope dies last '' Baiji is functionally extinct Search for baiji New Scientist `` Yangtze river dolphin is almost certainly extinct '' China 's White Dolphin Likely Extinct Scientific American August 08, 2007, `` Requiem for a Freshwater Dolphin '' Extant Cetacea species Kingdom Animalia Phylum Chordata Class Mammalia Infraclass Eutheria Superorder Laurasiatheria Order Cetartiodactyla Suborder Whippomorpha Parvorder Mysticeti ( Baleen whales ) Balaenidae Balaena Bowhead whale ( B. mysticetus ) Eubalaena ( Right whales ) Southern right whale ( E. australis ) North Atlantic right whale ( E. glacialis ) North Pacific right whale ( E. japonica ) Balaenopteridae ( Rorquals ) Balaenoptera Common minke whale ( B. acutorostrata ) Antarctic minke whale ( B. bonaerensis ) Sei whale ( B. borealis ) Bryde 's whale ( B. brydei ) Pygmy Bryde 's whale ( B. edeni ) Blue whale ( B. musculus ) Omura 's whale ( B. omurai ) Fin whale ( B. physalus ) Megaptera Humpback whale ( M. novaeangliae ) Eschrichtiidae Eschrichtius Gray whale ( E. robustus ) Neobalaenidae Caperea Pygmy right whale ( C. marginata ) Parvorder Odontoceti ( Toothed whales ) ( cont. below ) Delphinidae ( Oceanic dolphins ) Cephalorhynchus Commerson 's dolphin ( C. commersonii ) Chilean dolphin ( C. eutropia ) Heaviside 's dolphin ( C. heavisidii ) Hector 's dolphin ( C. hectori ) Delphinus Long - beaked common dolphin ( D. capensis ) Short - beaked common dolphin ( D. delphis ) Feresa Pygmy killer whale ( F. attenuata ) Globicephala ( Pilot whales ) Short - finned pilot whale ( G. macrorhynchus ) Long - finned pilot whale ( G. melas ) Grampus Risso 's dolphin ( G. griseus ) Lagenodelphis Fraser 's dolphin ( L. hosei ) Lagenorhynchus Atlantic white - sided dolphin ( L. acutus ) White - beaked dolphin ( L. albirostris ) Peale 's dolphin ( L. australis ) Hourglass dolphin ( L. cruciger ) Pacific white - sided dolphin ( L. obliquidens ) Dusky dolphin ( L. obscurus ) Lissodelphis ( Right whale dolphins ) Northern right whale dolphin ( L. borealis ) Southern right whale dolphin ( L. peronii ) Orcaella Irrawaddy dolphin ( O. brevirostris ) Australian snubfin dolphin ( O. heinsohni ) Orcinus Killer whale ( O. orca ) Peponocephala Melon - headed whale ( P. electra ) Pseudorca False killer whale ( P. crassidens ) Sotalia Tucuxi ( S. fluviatilis ) Guiana dolphin ( S. guianensis ) Sousa Indo - Pacific humpbacked dolphin ( S. chinensis ) Atlantic humpback dolphin ( S. teuszii ) Stenella Pantropical spotted dolphin ( S. attenuata ) Clymene dolphin ( S. clymene ) Striped dolphin ( S. coeruleoalba ) Atlantic spotted dolphin ( S. frontalis ) Spinner dolphin ( S. longirostris ) Steno Rough - toothed dolphin ( S. bredanensis ) Tursiops Indo - Pacific bottlenose dolphin ( T. aduncus ) Burrunan dolphin ( T. australis ) Common bottlenose dolphin ( T. truncatus ) Monodontidae Delphinapterus Beluga ( D. leucas ) Monodon Narwhal ( M. monoceros ) Phocoenidae Neophocaena Finless porpoise ( N. phocaeniodes ) Narrow - ridged finless porpoise ( N. asiaorientalis ) Phocoena Spectacled porpoise ( P. dioptrica ) Harbor porpoise ( P. phocoena ) Vaquita ( P. sinus ) Burmeister 's porpoise ( P. spinipinnis ) Phocoenoides Dall 's porpoise ( P. dalli ) Physeteridae Physeter Sperm whale ( P. macrocephalus ) Kogiidae Kogia Pygmy sperm whale ( K. breviceps ) Dwarf sperm whale ( K. simus ) Iniidae Inia Amazon river dolphin ( I. geoffrensis ) Lipotidae Lipotes Baiji ( L. vexillifer ) Platanistidae Platanista Ganges and Indus River dolphin ( P. gangetica ) Pontoporiidae Pontoporia La Plata dolphin ( P. blainvillei ) Ziphiidae ( Beaked whales ) Berardius Arnoux 's beaked whale ( B. arnuxii ) Baird 's beaked whale ( B. bairdii ) Hyperoodon Northern bottlenose whale ( H. ampullatus ) Southern bottlenose whale ( H. planifrons ) Indopacetus Tropical bottlenose whale ( I. pacificus ) Mesoplodon ( Mesoplodont whales ) Sowerby 's beaked whale ( M. bidens ) Andrews ' beaked whale ( M. bowdoini ) Hubbs ' beaked whale ( M. carlhubbsi ) Blainville 's beaked whale ( M. densirostris ) Gervais ' beaked whale ( M. europaeus ) Ginkgo - toothed beaked whale ( M. ginkgodens ) Gray 's beaked whale ( M. grayi ) Hector 's beaked whale ( M. hectori ) Strap - toothed whale ( M. layardii ) True 's beaked whale ( M. mirus ) Perrin 's beaked whale ( M. perrini ) Pygmy beaked whale ( M. peruvianus ) Stejneger 's beaked whale ( M. stejnegeri ) Spade - toothed whale ( M. traversii ) Tasmacetus Shepherd 's beaked whale ( T. sheperdi ) Ziphius Cuvier 's beaked whale ( Z. cavirostris ) Taxon identifiers Wd : Q188130 ADW : Lipotes BioLib : 20772 EoL : 328475 Fossilworks : 63539 GBIF : 2440328 ITIS : 180409 IUCN : 12119 MSW : 14300143 NCBI : 118797 Species+ : 4061 ARKive : baiji / lipotes - vexillifer WoRMS : 254962 LCCN : sh85077313 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Baiji&oldid=814964293 '' Categories : IUCN Red List critically endangered species 2007 in the environment Mammals described in 1918 EDGE species Endemic fauna of China Mammals of China River dolphins Extant Miocene first appearances Yangtze River Species made extinct by human activities Mammal extinctions since 1500 Species endangered by pollution Species endangered by use as food Species endangered by damming Species endangered by collisions with vehicles Species endangered by being bycatch Hidden categories : All articles with dead external links Articles with dead external links from May 2017 Articles with permanently dead external links Wikipedia semi-protected pages Use mdy dates from March 2015 Articles with ' species ' microformats Articles containing Chinese - language text Articles with hAudio microformats Articles containing simplified Chinese - language text Articles containing traditional Chinese - language text Articles needing additional references from December 2017 All articles needing additional references Articles with attributed pull quotes Webarchive template wayback links Wikipedia articles with LCCN identifiers Talk View source Contents About Wikipedia Wikispecies Afrikaans Azərbaycanca Bân - lâm - gú Български Brezhoneg Català Cebuano Čeština Dansk Deutsch Español Esperanto Euskara فارسی Français Galego 한국어 Hrvatski Ido Bahasa Indonesia Interlingua Italiano עברית Қазақша Lietuvių Magyar Nederlands 日本 語 Novial پنجابی Polski Português Română Русский Scots Simple English Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska ไทย Türkçe Українська Tiếng Việt 文言 Winaray 吴语 粵語 中文 Edit links This page was last edited on 11 December 2017, at 22 : 51. 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Question: when did the baiji river dolphin become extinct
Answer: late 2006