The Yangtze’s initial recovery is testimony to China’s “immense” ability to concentrate state resources on environmental problems, says Wang Limin, a veteran Chinese conservationist. He is encouraged most by the rise in the finless porpoise population because, as an “indicator species” and top predator, the porpoise is a sensitive barometer of the health of the overall ecosystem. It is also cute enough to attract lots of public attention. Mr Wang hopes the tale of the Yangtze’s decline and rebound will make the Chinese people more environmentally aware. Even so, the human cost of the Yangtze’s recovery has been substantial. Some 230,000 fishermen lost their jobs and their boats, which were destroyed or confiscated. According to China’s state-run media, they were given compensation, were retrained and in some cases found new jobs that were better paid than their old ones. But a visit to former fishing communities paints a different picture.

Jinxian county is on the banks of Junshan lake, south of the Yangtze’s main channel. Locals reckon that only one in five fishermen got compensation for the loss of their livelihood, and even that was far less than they used to earn. Most had to leave to work as migrant labourers in big cities. “No one listens to the common people. The government decided everything. You can’t argue with them,” says one bitter former fisherwoman who now runs a restaurant. A propaganda sign nearby offers cold comfort: “Ban fishing together; move forward together.” At a village down the road Mr Zhang, shirtless in the stifling heat, points to the dock where his boat used to moor, now overgrown with weeds. He once enjoyed the best fishing on the lake, he sighs. Encouraged by the government, he has raised swamp eels, a local delicacy, in ponds since the ban. But unlike fishing, aquaculture requires big investments that can go sour if demand slumps. “Everyone’s losing money this year,” he says.

So "at what cost" is they found two bitter uncles, one who transitioned to running a successful restaurant and the other who transitioned into running a successful aquaculture business with the help from the government