The general term for hippopotamus. Hippocampus is named after its head resembles a horse's head, but interestingly, it is a strange and precious small fish near land and shallow sea. It belongs to the sea horse of the genus Syngnathus, with a flat head and two nostrils on each side. The head and trunk are at right angles, and the chest and abdomen protrude, and it is composed of 10 ~ 12 bone ring. The tail is slender, with four sides and often curly. The whole body is completely wrapped by membranous bone blocks. There is a pouch on the ventral surface of the male hippocampus, in which eggs hatch and can reproduce for 2-3 generations a year. At present, the artificial propagation of hippocampus has been successful. Hippocampus is a valuable Chinese medicine with high economic value, which has the medicinal functions of strengthening the body, tonifying kidney and strengthening yang, relaxing muscles and tendons, relieving inflammation and pain, calming the nerves, relieving cough and asthma. Especially for the treatment of nervous system diseases. Hippocampus is not only mainly used to make various synthetic drugs, but also can be taken directly to strengthen the body and treat diseases.