Cormorant fishing is a traditional fishing method in which fishermen use trained cormorants to fish in rivers. The cormorants are tied with a snare near the base of their throat, which prevents them from swallowing larger fish. The cormorants are then released into the water, where they dive and catch fish. When a cormorant catches a fish, it is brought back to the boat, and the fish is removed from its throat. The cormorants are then rewarded with a small fish that they can swallow. This method of fishing is still practiced in some parts of the world, particularly in Asia.