The baskets he's carried up the hillside give a clue to Yang's business. But before he starts work, he needs to let some water out of the system. As the water level drops, the mystery is revealed. Golden carp. Longxian villagers discovered the benefits of transferring wild caught carp into their paddy fields long ago. The tradition has been going on here for at least 700 years. As the water level in the paddy drops, bamboo gates stop the fish escaping. The beauty of this farming method is that it delivers two crops from the same field at the same time. Fish and rice. Smart ecology like this is what enables China to be largely self-sufficient in food, even today.


老杨带上山坡的篮子泄露了他营生的秘密。在开工前，他先需要释放些水出来。谜底随着水位的下降而水落石出——金鲤。龙现人在很久前便沿用稻鱼共生至今，这一传统延续了七百多年之久。当禾田里的水位下降，竹阀门阻止了金鲤的潜逃。这一神奇的生态养殖方式，同时同地丰获了两大农产：鱼与大米。如此充满智慧的生态养殖，即便今时今日也在为中国农副产品的自给自足奠定着基础。