There are two kinds of eels in Huang Qing, yellow eels are commonly known as eel, green eels are commonly known as rattan eels, wind eels, which are sweet and mild, good at penetrating deep tan, and can only be obtained in cold winter points, and can be used to treat malnutrition, dysentery, damp wind in the back and feet, five hemorrhoids, intestinal wind, bleeding, leukorrhagia and vulvar sores. Pregnant women are taboo. Monopterus albus Zuiew, a natural species with phlegm and slippery sperm, belongs to Fishes, Syngnathidae, Syngnathidae and Monopterus in animal taxonomy. At present, there is only one species of Syngnathidae confirmed by investigation, and there are no records of Symbranchus grammicu Cantor and AmPhipnous cuchia Muller.

According to observation, Monopterus albus can be divided into dark yellow or light yellow with black spots, and blue gray or light gray with black spots. In the past, the two kinds of Monopterus albus were excellent varieties with strong vitality and fast growth. Monopterus albus with yellow spine and neck can also be used as artificial breeding species.

2. Distribution Monopterus albus is naturally distributed in other areas except Heilongjiang in the north, Qinghai, Tibet, Xinjiang in the west and South China Sea Islands in the south, especially in the middle and lower reaches of the Yangtze River, where the distribution density is high and the yield is high. In recent years, China has vigorously developed aquaculture and introduced artificial farming. In addition to parts of Tibet and Qinghai, many areas such as Xinjiang and Hainan have also introduced eel farming. Therefore, at present, Monopterus albus has been widely distributed in fresh water areas all over China.

Abroad, Monopterus albus is mainly distributed in Thailand, Indonesia, the Philippines and other places, and also distributed in India, Japan and North Korea.