A fisherman displays algae-filled water at the Chaohu Lake in Hefei, Anhui province, May 1, 2008. Chaohu, the country's fifth largest body of freshwater, suffered blue-green algae outbreak last summer, endangered water supply in nearby cities and posed a great threat to aquatic life.

A fisherman pulls a boat at the algae-filled Chaohu Lake in Hefei, Anhui province, May 1, 2008. Chaohu, the country's fifth largest body of freshwater, suffered blue-green algae outbreak last summer, endangered water supply in nearby cities and posed a great threat to aquatic life.

(China Daily May 4, 2008)