Monk snakeheads are commonly known as knotted fish, toadfish, sea toad, pipefish and so on. Belong to the bony fish, monkfish order, monkfish family, for the world of fish, the Atlantic Ocean, the Pacific Ocean and the Indian Ocean are distributed, a variety of species: the big ones can reach 1-1.5 meters. There are only two species in China, one is called yellow snakehead, the other is black snakehead. The former has 2 rows of mandibular teeth. The former has 2 rows of mandibular teeth, white in the mouth, and 8-11 brachial fins; the latter has 3 rows of mandibular teeth, black and white circular markings in the mouth, and 6-7 brachial fins. Yellow snakeheads are distributed in the Yellow Bohai Sea and the northern part of the East China Sea, and black snakeheads are mostly found in the East China Sea and the South China Sea.