A doubling of fish biomass along Asia’s longest river shows hope for large-scale conservation efforts and a lifeline for the endangered finless porpoise.By Johnny SturgeonFlowing almost 4,000 miles from the Tibetan Plateau to the East China Sea, the Yangtze is China’s “Mother River.” From the emerald-green rice paddies of Hunan to the industrial hubs of Wuhan and Shanghai, the river basin generates 40 percent of the nation’s economic output. Yet, 70 years of rapid development had, until recently, wreaked havoc on its delicate marine ecosystem.

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