Monopterus albus belongs to Chordata, Vertebrate, Skeleton, Kiwifruit, Syngnathidae, Syngnathus, Monopterus and Monopterus. Monopterus albus is also called eel. The body is slender and snake-shaped, with a body length of about 20-70 cm, the longest 1 m, a flat back in front of the body and a pointed tail. The head is long and round. The mouth is big, the end position, the upper jaw is slightly prominent, and the lips are quite developed. There are fine teeth on the upper and lower jaws and flap bones.