CATDOLL : CATDOLL: There are more and more conger eel farmers. What technologies are needed for conger eel farming?

Eel is a precious fish that is farmed in fresh water. It has tender and delicious meat, high nutritional value, and certain medicinal value. Artificial breeding technology for eels does not require high technology, and the source of feed is wide; in recent years, a large number of farmers have raised eels in earthen ponds and achieved high yield and high efficiency. Early spring sowing can be put on the market in late autumn, with an average yield of 800-1000 kg per mu. The high-yield and high-efficiency breeding technology of yellow eel in earthen ponds is introduced. Eel farms require ventilation and lighting, sufficient water sources, and the area should not be too large. Covering the earthen pond with 0.8-1m high floating objects or water peanuts, and setting up fences or net fences can prevent eels from escaping. It can also provide shade, which is conducive to its growth. Excess silt should be dug out before raising fish, the bottom of the pond should be leveled, and the pond, water inlet and outlet should be repaired. Put it in the pond after 10-15 days, and disinfect it with 10-125 kg of quicklime per 1000 square meters. Completely eliminate wild fish and pests. 5-7 days before the water is injected into the lower pond at 0.6-0.7 meters, the water is filtered with a 60-mesh screen. Finally, the application of basal fertilizer is generally carried out at 300-400 kg of decomposed pig manure per 1,000 square meters. When the water is light green or yellow-brown, eel species can be put in and eaten after ponding. It takes about 15 days to dig the pond water to a depth of 1.5 meters.

The suitable growth temperature is between 20℃-28℃, and the water temperature is around 12℃, so the feeding time is generally from late February to mid-March. Before putting it in, put the eel fry in the water for 20-30 minutes to adapt to the water temperature. When the temperature difference between the inside and outside of the bag is below 5℃, the bag can be disassembled, and then 2~3 pots of water can be poured into the bag with a small pot. The species of electric eels gradually change from a high dissolved oxygen state to a low dissolved oxygen state. At the same time, disinfection should be performed before administration. After washing with 0.75 kg of water for every 50 kg of water, add 0.75 grams of salt for 15 minutes to 20 minutes. The eel species should be grayish white, elastic, and active in swimming. Similar specifications should be neat. Otherwise, competition between eels will affect the food of the weak. The breeding density is generally about 4000-5000 per 1000 square meters; about 3000-4000 grams can be fed, and about 50 grams can feed 2000-3000 eels.

Artificial eels mainly rely on special compound feed (available on the market), supplemented with 50-60 grams of vitamins (vitamin A, B, C, E) for every 50 kg, and 1.5 kg of cod liver oil, which are appropriately added to young eels. When special feed is temporarily in short supply, it can be replaced by animal feed such as small fish, livestock offal, silkworm cocoons, etc., and the crude protein content must reach more than 40%. The factory site is located in the Helixia area, with abundant water sources, fresh water quality, convenient transportation and electricity. The pond area is 156 mu, and the area of ​​a single pond is 8-12 mu. There are 16 ponds, each of which can enter and exit water independently, equipped with 1-2 aerators and 2-3 fixed food tables. Renovation and disinfection of the pond: After the Spring Festival, the pond will be renovated and exposed to the sun. 35 kg of quicklime and water will be used to spray the entire pond (including the edge of the pond) for disinfection. Pour 15~20 cm of water into the pond, and 20 kg of tea seed cakes are used for pond cleaning, impurity removal and fattening.

In order to extend the best growth period of eels, eel fry are cultured in a greenhouse at 28℃ in the early stage. When the water temperature is constant above 24℃ in early June, they are placed in earthen ponds. The stocking specifications are 60~100 fish/kg. Potassium permanganate is used for disinfection when stocking fry, and the ponds are divided according to specifications. The stocking quantity is about 1800 per mu. Good water quality control is the key to achieving high yield and high efficiency of eels. Change water frequently, add water 2~3 times a month, 15cm each time, especially in the late breeding period, increase the water volume. Secondly, start aeration frequently, install a water wheel aerator at the pool mouth, and adjust the aeration time according to weather conditions. In the late breeding period, especially in the high temperature season, the aeration time is not less than 8 hours a day to increase dissolved oxygen and improve the pond water environment. Use biological agents regularly. In the late breeding period, due to the large stock of ponds, residual bait and excrement, the water quality is easy to deteriorate. We use 500g/mu EM bacteria 1-2 times a month, and use photosynthetic bacteria and Bacillus appropriately.

The pond for sea eel breeding 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 sea eels from escaping.

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.

The eel farm needs to be well ventilated and lighted, with sufficient water sources, and the area should not be too large. Excessive silt should be dug out before raising fish, the bottom of the pond should be leveled, and the pond, entrance and drain should be repaired. 10-15 days before putting the eel fry into the pond, disinfect the pond with 10-125 kg of quicklime per 1,000 square meters. Completely eliminate wild fish and harmful organisms. The eel species requires grayish white body color, elasticity, and active swimming. The same specifications should be neat.

1. Breeding site. Breeding site is the most basic condition for eel breeding. If there is no suitable breeding site, then don't talk about breeding eels. The site for eel breeding generally requires at least 50 acres. Secondly, the breeding farm must be equipped with a water injection system, a drainage system, a heating and cooling system, an aerator, etc., and the eel pond must be planned. In addition, the water source near the breeding farm must be abundant, the water quality must be pollution-free, and the electricity and transportation must be convenient. 2. Water quality requirements. Water quality is crucial to eel breeding, and the water quality requirements are mainly reflected in the following aspects. The first is the water temperature. Under normal circumstances, the water temperature is best between 25 and 28 degrees, but the temperature between 15 and 30 degrees is also acceptable. Secondly, the water quality is best to be slightly acidic, so that the productivity of eels is stronger. Then the oxygen content in the water body must be sufficient, preferably between 5 and 12 milligrams per liter.

1. Pond setting and disinfection. The requirements for pond setting and disinfection are basically the same as those for ponds for eel fry breeding.

2. Stocking density. Generally, about 7,000 eels weighing 50 grams can be stocked per acre of pond.

3. Feeding. Place several feeding tables on each side of the pond, and place artificial compound feed on the feeding tables for eels to eat.

4. Water quality management. If eels are found gathering on the water surface and circling around the edge of the pond, it means that the dissolved oxygen in the water is insufficient. At this time, the aerator should be started to increase oxygen.