China postpones dam dredging to enable sturgeon to spawn
News - December 15, 2009
Xinhua News Service reports that China postponed the annual dredging of a dam on the Yangtze River for about two weeks to ensure propagation of Chinese sturgeon, navigation engineering authorities said Monday.
The dredging project, originally scheduled in late November, started on December 5th and will finish on December 20th to clear away some 70,000 cubic meters of silt from the bottom of the Gezhouba Dam, said the navigation engineering bureau of Yichang section of the river.
The project started after wild Chinese sturgeon spawned in the downstream of the dam on November 23rd and November 24th.
Chinese sturgeon are listed as an endangered species. Pollution and disruption from ship's can interfere with conservation efforts.
Born in the Yangtze River and growing to maturity in the sea, Chinese sturgeon become sexually mature at the age of 15 and migrate back to the upstream Jinsha River for spawning.
After the Gezhouba Dam was built across the main stream of the river in 1981, the sturgeons' migration route was cut off. However, researchers said sturgeon had found new spawning grounds downstream the dam over the past 20 years.
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