China, with one-fifth of the world's population, accounts for one-third of the world's reported fish production and two-thirds of the worlds reported aquaculture production. Aquaculture, the farming of fish in ponds, lakes and tanks, accounts for two-thirds of China's reported output. China's 2005 reported harvest was 32.4 million tonnes, more than 10 times that of the second-ranked nation, India, which reported 2.8 million tonnes. The principal aquaculture-producing regions are close to urban markets in middle and lower Yangtze valley and the Zhu Jiang delta.