What kind of duck can catch fish in northern China?

The cormorant is a bird that preys on fish. After being domesticated, it loses the ability to fly and is only used to mooring on boats. The fishermen tie the rope around the cormorant's neck so that it can catch it. After catching the fish, it cannot swallow it without suffocating, so the cormorant returns to the boat after catching the fish and the fisherman squeezes the fish out of its throat. Nowadays, this method of fishing is rarely used. It is cost-effective and low-efficiency, and can only be used as a tourist attraction.