CATDOLL : CATDOLL: Many people don’t understand the technology of conger eel farming. What are the key points of conger eel farming technology?

Conger eel belongs to the class of bony fish, order of Anguilliformes, family of Anguillidae. It is also called eel, yellow eel, and red eel. It is a ferocious bottom fish. It lives in the sea area with muddy bottom or rocky reefs at a depth of 50-80m. It swims quickly and is voracious, eating shrimp, crab, fish, squid, etc. Conger eel meat is tender and fresh, and rich in nutrition. In addition to fresh sales and canning, its dried product "eel jerky" is popular in domestic and foreign markets. Moreover, eel can be used as fish maw or to make glue. It is one of the main economic fish in my country's coastal areas. In recent years, conger eel farming has developed rapidly along the coast of Zhejiang Province and has achieved good economic benefits.

The pond for breeding conger eels is generally about 10-20 mu, with convenient water inlet and outlet, good water exchange conditions, and an average water level of more than 1.2m. The pond dam should be solid, firm, and without holes. The soil at the bottom of the pond should be soft to facilitate eels to burrow and live, but there should not be too much mud at the bottom of the pond, and it should not contain black rotten mud. Half a month before stocking, dry the pond and expose it to the sun or clean it with water, then sprinkle 75-100kg of dry lime per mu, or use 20-25kg of bleached poplar per mu, dilute it with water and sprinkle it on the bottom and side of the pond for disinfection. In addition, flat nets should be inserted in the gates of the pond inlet and outlet to prevent conger eels from escaping.

2. Selection and transportation of conger eels Keep the environment dark to reduce the activity of conger eels. During the entire transportation process, the operation should be careful and fast to minimize the exposure time of the conger eels and prevent the conger eels from secreting too much mucus.

Precautions for eel farming When the eel is first put into the pond, due to the difference between the environment in the pond and the environment in the sea area, the eel is very active, "nausea" and secretes mucus. To maintain fresh water quality within 1-2 days after entering the pond, the water change volume must be increased, and the daily water change rate is 100%. In the hot season, the water should be changed twice a day, and the daily water change rate should reach 80%. The daily water change rate is controlled at about 50%. In winter, the water temperature drops, and the fish burrows and does not eat. Generally, the water change rate is controlled at about 30%. The transparency of the pool water should be maintained at 30-50cm, and the pool water should be maintained above 1.2m in winter.

1. Disease prevention and control

During the breeding period, sterilization and deworming are carried out every 15 days. Biological agents and water quality improvers are used regularly. In addition, rhubarb and yellow are used twice a month.

Grind lotus, garlic and other Chinese herbal medicines and mix them with feed to feed the fish. This can effectively prevent and reduce the occurrence of diseases. 2. Rotational capture and release and wintering management

The technique of rotating catch and release is a production-increasing technique for eel farming, which is mainly based on the growth law of eels. By July, 50% of the eels have reached the standard size.

(0.4 jin/tail), in line with export requirements, catch once every month, stop feeding for 1 to 2 days before the rotation of catch.

Winter management is the bottleneck of eel farming in our area. The farm ensures the smooth wintering of eels by fattening them in autumn and increasing the water level.

As the water temperature gradually drops, while ensuring that the fish eat, increase the fat content in the feed until the water temperature drops to 10°C and stop feeding.

Keep it at about 2 meters, and break the ice in time when the water surface is frozen to prevent freezing and ensure the survival rate.

1. Reasonable design of breeding ponds. The ponds for sea eel breeding are generally about 10-20 mu, with convenient water inlet and outlet, good water exchange conditions, an average water level of more than 1.2m, and the pond dam is required to be solid, firm and without holes.

2. Carry out feeding management. The bait for sea eel farming is generally fresh small hairtail, blue round, green catfish, etc. When fresh bait is scarce, you can also use frozen or dried small fish and shrimp. Rinse the bait before feeding.

3. Pond water management. When the eels are first put into the pond, due to the difference between the environment in the pond and the environment in the sea area, the eels are very active, "regurgitate" and secrete mucus. To maintain fresh water quality within 1 to 2 days after entering the pond, the amount of water change must be increased, and 100% of the water should be changed daily.

4. Pay attention to prevent fish diseases. In the process of sea eel farming, the most common disease is enteritis, which is mainly caused by poor water quality in high temperature seasons, feeding spoiled bait and fish eating too much.

5. Carry out other related management, such as patrolling the pond frequently and observing it frequently, patrolling the pond 1 to 2 times a day, and checking whether there are gaps or holes in the embankment, flat net, and gate.

The conditions for the breeding of sea eels are good drainage, soft soil, and not too much mud. Fresh hairtail, blue round, green catfish, etc. are generally used as bait, and they are fed twice a day. It takes 1-2 days to keep the water fresh.

Before raising fish, the excess silt should be dug out, the bottom of the pond should be leveled, and the pond, water inlet and outlet should be repaired. After 10-15 days, the pond should be put in and disinfected with 10-125 kg of quicklime per 1,000 square meters.