The Yangtze Finless Porpoise is a relatively small member of the whale family (Cetacea), males reaching up to only 6.2” and females an average of 5.6”, although the largest one ever sighted was an astounding 7.5”. 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. It was the worst in 50 years. In the case above, the present finless porpoise might detect a larger target such as a school of fish from long distance. Primarily, the porpoise should adjust to a smaller diet. They can reach a length of 2.27m, and have a known body mass of 71.8 kg, (Kasuya, 1999). Some animals are so beautiful, they are put in front of people to gander at in captivity, such as the Yangtze Finless Porpoise. 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. The model results are in good agreement with the observed data, and the simulation well reproduces the spatial position distribution and abundance of the Yangtze finless porpoise in Poyang Lake. The scans show the porpoises hear omni-directionally, making it hard for them to distinguish sounds among a bunch of different sounds.“Now that we have some hearing data, we are working on modeling how the conformation of these pads and their dimensions and shapes relate to the frequencies and sensitivities,” Darlene Ketten, a biologist and director of the Computerized Scanning and Imaging (CSI) facility at WHOI, said.“In a noisy environment, they’d have a hard time hearing their prey or their friend. It is the only member of the family, Phocoenidae, without a dorsal fin. Many lakes became grasslands with no fish during the finless porpoise’s breeding season, causing insufficient feeding,There have been some conservation efforts such as the establishment of five natural reserves along the middle and lower courses of the Yangtze River since 1986 for rare cetacean species, (Wang.Better conservation and protection needs to be in place and enforced otherwise the Finless Porpoise shall suffer the same fate as the Baiji Dolphin.Akamatsu, T., Wang, D., Wang, K., Naito, Y., (2005), Biosonar behaviour of free-ranging porpoises,Dong, W., Xu, Y., Wang, D., Hao, Y., (2006), Mercury concentrations in Yangtze finless porpoise (.IWC (International Whaling Commission), Annex K Report of the standing sub-committee on small cetaceans, (2001).Jefferson, T. A., Hung, S. K., (2004), A review of the status of the Indo-Pacific humpback dolphin (Sousa chinensis) in Chinese waters.Kasuya, T., (1999), Finless porpoise Neophocaena phocaenoides (G. Cuvier, 1829).Li, S., Akamatsu, T., Wang, D., Kexiong, W., Dong, S., Zhao, X., Wei, Z., Xianfeng, Z., Taylor, B., Barrett, L., Turvey, S., Reeves, R. R., Stewart, B., Richlen, M., Brandon, J., (2008), Indirect evidence of boat avoidance behavior of Yangtze finless porpoises.Liu, R., Wang, D., Zhou, K., (2000), Effects of water development on river cetaceans in China, In Biology and conservation of freshwater cetaceans in Asia.Muiller, B., Berg M., Yao, Z. P., Zhang, X. F., Wang, D., Pfluger, A., (2008), How polluted is the Yangtze river? 4), approximately one ship every 100m, (Zhao,A high number of vessels are cargo ships, however with China’s vast growing population; a large majority are fishing boats. There is little data that has assessed the impacts of pollutants on Yangtze finless porpoise overall health.
And yet we don't feel guilty as we should. 15–22.Smith, B. D., Zhou, K., Wang, D., Reeves, R. R., Barlow, J., Taylor, B., Pitman, R., (2007), Lipotes vexillifer. One of the most destructive threats is overfishing.
IUCN Red List of Threatened Species 2007. Also assessed is the Yangtze Finless Porpoise (Neophocaena asiaeorientalis asiaeorientalis), a subspecies of the Narrow-ridged Finless Porpoise and one of the world’s few remaining freshwater cetaceans. The Yangtze River, the longest river in Asia, was once home to two different species of dolphin: the Yangtze finless porpoise and the Baiji dolphin.
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