Cormorant fishing is a dying art. For thousands of years fishermen used trained cormorants to fish the rivers and lakes of China.
The fishermen tie a snare near the base of the bird's throat which prevents the birds from swallowing larger fish, which are held in the throat, but they can still swallow smaller fish. When a cormorant catches a fish, the fisherman will bring back to the boat and has the bird spit it up.
There aren't many real cormorant fisherman left these days, but a few still make a good living serving the tourism industry... by posing for memorable travel shots like this.