Five years ago, Hu Yidao, a Nanjing citizen, came to Bagua Island in the middle of Yangtze River and invested in contracting 30 mu (Chinese acre) of water surface below the Second Bridge on the north side. He engaged in aquaculture. Because the fish farm was near the Yangtze River, Mr Hu simply developed tourism and turned the fish ponds into a fishing center to attract urban people for leisure. In 2003, Mr Hu released more than ten thousand fingerlings. By the second year, Hu released another ten thousand crucian carp fingerlings for tourists to fish. But soon, some fishermen reflected that there were too few fish in the pond and they were hard to catch. This made Mr Hu confused: in less than two years, more than twenty thousand crucian carps had been released in the fish pond, but actually less than ten thousand were caught. Where did the other ten thousand go? In the third year, after Mr Hu once again released ten thousand crucian carps into the pond, he began to worry about theft and set up warning lines around the fish pond and increased night patrol security personnel. But by the fourth year, citizens who came to fish still complained that there were too few fish in the pond, they were difficult to catch, and some regular customers gradually stopped coming altogether.