Known for its mischievous smile, the finless porpoise has a level of intelligence similar to that of a gorilla. However, it needs an abundant food supply and in recent years, overfishing in the Yangtze has contributed to a decrease in its number.

The river mammal is teetering on the brink of extinction, with a population of around 1,000 in the main waterway of the Yangtze, according to research conducted in 2017.

Zhu used to love watching the river dolphins swimming near the shore searching for small fish. However, as he grew older he observed the impact of an influx of fishing boats on the dolphins.

"I even saw dead dolphins injured by the blades of fishing boats as they love to follow them," said Zhu, adding that he and other fishermen in Datong understand the big picture of the fishing ban.

"There used to be a lot of fish in the river, and we always came back fully loaded. But now, we don't catch as much, even with advanced gear," Zhu said.

Instead of fishing on the river, Zhu and his wife patrol 10 to 15 km of the waterway every day, sometimes collecting up to 200 kilograms of trash.

"It reminds me of my childhood when I see finless porpoises during the patrol," Zhu said. "It's an honor to protect these angels of the Yangtze River."

The city of Tongling is not alone in its efforts to protect the Yangtze River. About 100 km downstream from Datong lies Ma'anshan city, which launched a fishing ban on July 1.

A new line

Fisherman Zheng Laigen, 44, still earns a living from fish, but not the traditional way. Taking advantage of expertise he gained over the years, he is now the owner of a fish farm and manages about 13 hectares of ponds, raising crabs, shrimp and fish.

"The last decade has witnessed the depletion of fish stocks. We could catch about 40 kg of fish per day previously, but the number has slumped to less than 15 kg now," Zheng said.

More than 10,000 fishermen like Zheng stopped fishing last year. His nine fishing boats were dismantled in May, and he was given a 200,000 yuan subsidy by the local government. The government also provided him with a 40,000 yuan housing allowance.

His new business has prospered, with annual income estimated at 300,000 yuan. In the peak season in summer, he had to hire four people to help with the work on the fish farm.

To address housing problems, the local government helped families buy or rent houses below the market price. Many of the fishermen and their families lived on their riverboats.

Zhang Laixi, an ex-fisherman, owns a 60-square-meter apartment in a residential area built for fishermen moving ashore. "The government grants 15 square meters for each person. I needed more, so I just paid for the extra space," he said.

Apart from housing, the local government also organized job fairs and training classes for the fishermen.

Zhang, who has been fishing for 20 years, said he has no intention of working in a factory and now runs a convenience store in his community.

"It runs pretty well with an average daily turnover of 1,000 yuan. It's not much, but I really enjoy the freedom I have," Zhang said.