Eel is also known as river eel, eel, eel, and its scientific name is Japanese eel.

A. The shape of the eel

The eel body is slender, with a cylindrical front part and flattened rear part. The body length is 16.0 to 20.7 times the body height, which is The head length is 6.9~7.8 times; the head length is 4.4~5.5 times the snout length, the eye diameter is 10.7~13.7 times, and the distance between the eyes is 4.8~6 ．0 times． The eyes are small, the snout is protruding, and there is a longitudinal tooth belt on the mandible. The gill openings are well developed, with two pectoral fins and no pelvic fins. The dorsal fin and anal fin are low and long, and the anal fin is connected to the caudal fin. The back is dark brown, the abdomen is white, without spots, the body surface is mucus-rich, and the scales are mat-like and buried under the skin.

B. Characteristics of eels

Eels mainly feed at night, and adults mainly eat animal food. White eels mainly feed on zooplankton, aquatic insects and organic debris. Young eels weighing about 5 grams begin to prey on fry. A small eel weighing 100 grams can hunt small fish and shrimps. The feeding water temperature of eels is above 12°C, that is, from March to November, with the strongest intensity from June to July and September to October.

Eel is a river-dwelling fish. Eel fry migrate in spring near the estuary in search of bait. The body length of white eel is about 6 cm and the weight is 0.1 g. It grows for one year in fresh water. By the spring of the following year, it can grow to a body length of 15 cm and a weight of about 5 grams; in the spring of the third year, it can grow to a body length of 15 cm and a weight of about 15 grams; in the fourth year, it can grow to more than 50 grams. Under natural conditions, the largest eel that can be caught is 45 centimeters and weighs 1,600 grams.

Eels lay eggs and reproduce in the deep sea and grow in freshwater environments. It has a ferocious temperament, is gluttonous, restless, and stays out at night. It has strong phototaxis, likes running water, likes warmth, and lives in caves. It has a strong ability to trace water and can also escape into caves. Every autumn, sexually mature parent eels go to the sea to lay eggs and ejaculate. The fertilized eggs hatch in the deep sea and develop to metamorphosis. When spring comes, they swarm from the sea mouth into fresh water to live.

C. Benefits of eel farming

Eels grow quickly, are rich in nutrients, are delicious, have fewer spines and more meat, and have the effects of cooling, relieving heat, nourishing and strengthening the body, and are good for nocturnal syndrome and pneumonia. It has unique effects in treating tuberculosis and restoring health to teenage girls after childbirth. As early as 1874, Japan had begun research on river eel farming technology. my country began research in 1973 and developed on a large scale in 1985. At present, my country's pond, cement pool, running water and large water surface cage culture technologies have matured.

D. Eel market analysis

Due to the severe decline in domestic Japanese eel resources this year, the amount of eel fry caught and released has dropped significantly, making European eels completely replace Japanese eels and become the current With the rapid expansion of the scale of European eel farming, the dominant species for breeding and processing, the output has increased rapidly. The fluctuation of the value of eel in the international market affects the domestic market price of eel. Therefore, in the future, the price of eels in our country’s market will mainly be based on the trend of the international market.