3). They can reach a length of 2.27m, and have a known body mass of 71.8 kg, (Kasuya, 1999). Water quality downstream from the Three Gorges Dam.Reeves, R. R., Jefferson, T. A., Kasuya, T., Smith, B. D., Wang, D., Wang, P., Wells, R. S., Würsig, B., Zhou, K., (1997).Reeves, R. R., Smith, B. D., Kasuya, T. It is a kind of migratory aquatic organism in the rivers and lakes, and only exists in the mainstream of the middle and lower reaches of the Yangtze River and two large connecting lakes (Huang et al., 2017).Yangtze finless porpoise enters the Poyang Lake from the Balijiang river section through the Hukou station. A harbour porpoise, which is of the same family of a finless porpoise, is known to detect a water-filled stainless steel sphere with outer diameter 5.08 cm from up to 14 m by its sonar (Teilmann et al. Within its waters is the world’s only freshwater porpoise, the Yangtze finless porpoise, Neophocaena asiaeorientalis, (see Fig. In February and March 2008, unexpected low temperatures caused the water in the Tian’ezhou reserve to freeze over. Two typical parts of river-lake connection channel and the main lake area were analyzed separately. The Mercury concentrations in some key tissues were measured and found that the highest total mercury level concentrations in liver and kidney were both found in a 2-month-old calf, which implied that the transfer effiency of mercury from mothers to their young in the porpoise is remarkable. “Porpoises, like babies, can’t tell us if they can hear in their left or right ear, so we measure their hearing physiologically from the surface of the skin,” Mooney said.CT scans on the two porpoises revealed that the animals’ acoustic fat pads -- an area of the dolphins’ body that gives them the ability to hear and process echolocation -- are thicker and more disc-shaped compared to those found in other toothed whales. The river is only a relatively small body of water in comparison to the amount of pollution which is expelled into it; therefore the water quality can be degraded much more easily. 1979), and coastal finless porpoises preyed on icefish (Salanx), mullets (Liza), common sea bass (Lateolabrax japonicus), common mackerel (Pneumatophorus japonicus), prawns (Penaeus), and squid (Loligo — Zhou et al. Results show that the water depth, surface area and food availability in Poyang Lake are gradually decreasing, which lead to the weakening and plaque-like fragmentation of the Yangtze finless porpoise habitat. Yangtze finless porpoise is the only freshwater dolphins in the world. One of the most destructive threats is overfishing. With the operation of the Three Gorges Dam, the water ecosystem functions of Poyang Lake are deteriorating, which has negatively influenced the habitat of Yangtze finless porpoise. However, between 1998 and 2004, five finless porpoises died accidentally in the Eastern Dongting Lake. Finless porpoises live alone or in small groups and eat crustaceans, fish, and squid. (Eds. The finless porpoise in Hong Kong waters can feed on fish ranging from 5.5 cm to 58.6 cm , and the typical body length of the favorite prey of captive Yangtze finless porpoises is 7 cm (Wang CQ, personal communication), which is well above the selected target strength. Due to global warming, the Yangtze River is experiencing more extreme weather conditions, causing the porpoise to find it more difficult to breed successfully and to survive. sunameri (East Asian Finless Porpoise). According to the International Union for Conservation of Nature and Natural Resources (IUCN), Yangtze finless porpoises are considered critically endangered. It is found in China’s Yangtze river and two adjoining lakes, Poyang and Dongting. Yangtze finless porpoise is the only freshwater dolphins in the world. They are a particular conservation issue as they inhabit the same busy waters as the now likely extinct baiji (Lipotes vexillifer) Population genetic structure of the Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis): implications for management and conservation.http://www.discoveryangtze.com/Yangtzediscovery/map/mapyangtze.jpg,http://www.news.bbcimg.co.uk/media/images/65620000/jpg/_65620858_02.jpg,http://www.theepochtimes.com/n2/images/stories/large/2010/09/02/103228017Yangtze.jpg,http://thewatchers.adnorraeli.com/wp-content/uploads/2011/05/f04da2db14840f35eb7505.jpg,http://www.wildlifeextra.com/images/Baiji9medium.JPG,http://news.bbcimg.co.uk/media/images/65620000/jpg/_65620858_02.jpg,http://thewatchers.adorraeli.com/wp-content/uploads/2011/05/f04da2db14840f35eb7505.jpg,http://www.discoveryangtze.com/Yangtzediscovery/photo/mapyangtze.jpg. It is a kind of migratory aquatic organism in the rivers and lakes, and only exists in the mainstream of the middle and lower reaches of the Yangtze River and two large connecting lakes (Huang et al., 2017).Yangtze finless porpoise enters the Poyang Lake from the Balijiang river section through the Hukou station.


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