Wenchangdi was given by Emperor Wenchang to the worshippers of the festival. According to checking the official website of Science Publishing House, every year to the days around the birthday of Emperor Wenchang, Wenchang fish will appear, so it will be called Wenchang fish. Wenchang fish, also known as slug fish, Wenchang fish is not a fish, but is shaped like a small fish, is lower than fish marine animals, belonging to the ancient chordates.