Yangtze Porpoise Numbers Fall By Half In Six Years; About 1,000 Left In World's Most Degraded River

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A survey late last year found that the Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) population has been cut in half in just six years. During a 44-day survey, experts estimated 1,000 river porpoises inhabited the river and adjoining lakes, down from around 2,000 in 2006. The ecology of China's Yangtze River has been decimated the Three Gorges Dam, ship traffic, pollution, electrofishing, and overfishing, making it arguably the world's most degraded major river. These environmental tolls have already led to the likely extinction of the Yangtze river dolphin (Lipotes vexillifer), or baiji, and possibly the Chinese paddlefish (Psephurus gladius), which is one of the world's longest freshwater fish.

"The [Yangtze finless porpoise ] is moving fast toward its extinction," said Wang Ding, head of the research expedition, with the Institute of Hydrobiology (IHB) at the Chinese Academy of Sciences. IHB organized the expedition along with China's Ministry of Agriculture, the Wuhan Baiji Conservation Fund, and WWF-China.

During the expedition, the researchers spied 380 Yangtze finless porpoises, down from 851 in 2006. The group also counted 540 animals in two connected lakes, Poyang and Dongting. The counts lead to an estimate of around 1,000 animals. At its current rate of decline (13.7 percent annually), experts warn that the Yangtze river porpoise could be extinct by 2025. In fact, last year WWF-China found 32 dead Yangtze river porpoises in the lakes.

The experts believe that finless porpoises have become increasingly scattered by shipping traffic, dams, and habitat loss. Some of the animals appeared to be congregating in wharves and ports in order to find vanishing fish, but this makes them more likely to be struck by ships.

EDIT

http://news.mongabay.com/2013/0416-hance-yangtze-porpoise.html