Instead of hearing the roar of each individual ship’s propeller, what we heard was a sustained shrieking blast of pure white noise, in which nothing could be distinguished at all.
Happily, Professor Zhou did exist. Not only did he exist, but when Mark went to look for him at Nanjing University (I was ill that day), he was actually in and agreed to come and have dinner with us at the Jing Ling Hotel (by which time I was better because it was quite a good restaurant).
He was a polite, kindly man of about sixty. He guided us graciously through the unfamiliar menu and introduced us to the local delicacy, namely Nanjing Duck. This turned out to be very similar to Peking Duck (or Beijing Duck as we now know it – or, to be strictly accurate, Szechwan Duck, which is what we have been eating for years under the name Peking Duck. We had some wonderful Szechwan Duck in Beijing, because that’s what they eat there. Beijing Duck is something different and comes in two courses, the second of which is usually not worth bothering with). To conclude: Nanjing Duck turned out to be very similar to Szechwan Duck except that they spoil the thing by coating it with a solid half-inch layer of salt. Professor Zhou agreed that it didn’t taste nearly as pleasant that way, but that was how they did it in Nanjing.
Professor Zhou welcomed us to China, was surprised and delighted that we had come all this way to see the dolphins, said that he would do everything he possibly could to help us, but didn’t think it would do us any good. Things are difficult in China, he confided. He promised to try and phone the people at the dolphin conservation project in Tongling to warn them that we were coming, but didn’t hold out much hope because he’d been trying to get through to them on his own account for weeks.
He said that, yes, we were right. The noise in the Yangtze was a major problem for the dolphins, and severely interfered with their echolocation. The dolphins’ habit had always been, when they heard a boat, to make a long dive, change direction underwater, swim under the boat and surface behind it. Now, when they are under the boat, they get confused and surface too soon, right under the propellers.
These things had all happened very suddenly, he said. The Yangtze had remained unspoilt for millions of years, but over the last few years had changed very dramatically, and the dolphin had no habit of adaptation.
The very existence of the dolphin had not been known of until relatively recently. Fishermen had always known of them, but fishermen did not often talk to zoologists, and there had been a recent painful period in China’s history, of course, when nobody talked to scientists of any kind, merely denounced them to the Party for wearing glasses.
The dolphin was first discovered, in Dong Ting Lake, not in the Yangtze, in 1914 when a visiting American killed one and took it back to the Smithsonian. It was obviously a new species and genus of river dolphin, but little further interest was taken in it.
Then, in the late fifties, Professor Zhou returned from a field trip studying birds, to find an unlabelled skeleton waiting for him. It was the same species of dolphin, but this had been discovered, not in Dong Ting Lake, where they no longer existed, but in the river near Nanjing.
He interviewed some local fishermen who said they did see them from time to time. Any that were accidentally caught were sold for food. The ones that got caught in the fishing lines had a bad time of it, because the lines the fishermen traditionally use along the banks of the Yangtze are baited with hundreds of large, bare hooks.
Some studies were carried out around Nanjing, but for a while the Cultural Revolution put a stop to all that. Research picked up again in the seventies, but the difficulties of communication within China were such that research was only local, and no one really had a feel for exactly how rare the animal was, or what kind of predicament it was in.