CATDOLL : CATDOLL: How should you raise the wild eels you just caught? What should you do if they refuse to eat at first?

1. How should you raise the wild eels you just caught? What should you do if they refuse to eat at first?

Put it in the pond! Use earthworms as bait! They will eat it slowly

2. How to raise eels at home

Find a small bucket, fill it with a layer of mud, any mud will do, about 20 to 30 centimeters thick. After one night you will find the hole it made!

3. How to raise eels at home

Spread sand and pebbles on the bottom of the tank. If it is a caught yellow eel, take some mud from the water where it originally lived at the place where you caught it, put some aquatic plants, and make a hiding hole in the tank. You can use stones to make it. The water must be exposed to the sun. Only keep one eel in a tank. The water should not be too deep, 10cm to 20cm will be enough. After doing all this, put the eel in and let it adapt for a few days. Eels are very afraid of people, so during the day they will definitely rest in the hiding hole you created. After a few days, put in a few small fish. If they eat it, it means they have successfully adapted. I hope you will adopt this idea.

4. How to raise eels?

1. Eel cage farming

The use of cage culture to culture eels is still in the technical development stage. Cage culture is suitable for large water bodies. The main advantage is that water flows through the mesh, forming a living water environment in the box, so the water quality is fresh and rich in dissolved oxygen, and high-density intensive culture can be implemented. The main breeding technologies are as follows:

The area of ​​the cage is preferably about 20 square meters, with a length of 5m, a width of 4m, and a height of 1m. The above-water part is 40cm, and the underwater part is 60cm. The quality of the net should be good, the mesh should be dense, and the strips should be tight to prevent the eels from escaping due to being bitten by water rats. The cage is set in a pond with a water depth of more than 0.8m. The newly made cage should be placed in the water for 35 days until the harmful substances emitted by it disappear before the eels can be released. A few days before the release of the eels, the water quality should be properly cultivated to make the water color thicker and the transparency about 15cm, so as to control or reduce the damage of mites in the pond to the eels. The cages can be set side by side in the pond, and bamboo frames can be set between the two rows of cages for people to walk and feed. The area of ​​the cage should not exceed 50% of the total area of ​​the pond, otherwise it will easily cause the water quality to deteriorate. Aquatic plants, preferably water peanuts, are placed in the cages, and their coverage area should account for 90-95% of the cage area, providing a good environment for the growth and habitat of eels.

Eels have the habit of cannibalizing each other, so it is better to keep them in the same size. Generally, 20kg of eels can be stocked per square meter, and 400kg can be stocked in each cage.

Once the eel is used to one kind of feed, it is difficult to change its habit and eat another kind of feed, so its feed should be fixed with several varieties, such as earthworms, small fish, mussel meat or animal offal, to increase its growth rate. If conditions permit, live bait can be put in, because it has a high utilization rate, does not need to remove the leftover bait, and has less pollution to the cage, which is conducive to the growth of the eel.

The most critical period of yellow field eel cage culture is within one month after stocking. This period is the process of yellow field eel changing its original living habits and adapting to the new environment. If the method is appropriate, the survival rate of eel species can reach more than 90%, but if the method is inappropriate, the survival rate is sometimes less than 30% or even all of them die. This month is the key to the success or failure of yellow field eel cage culture. In addition to disinfecting and domesticating the eel species, the occurrence of diseases should also be effectively controlled. The specific method is to use strong water disinfectants and quicklime for disinfection alternately to prevent the generation of pathogens.

2. Eel farming in plastic greenhouse without soil and flowing water

Conventional pond farming is prone to disease and the hibernation of eels affects year-round farming. Using plastic greenhouses to farm eels allows for continuous production all year round. Soilless and flowing water farming can effectively control diseases and increase benefits exponentially.

The most suitable growth temperature for eels is 27℃～30℃. With plastic greenhouses, there is no need for special heating equipment, and the temperature in the greenhouse can be easily maintained at this temperature in spring, summer and autumn. Even in the cold winter, the average temperature in the greenhouse can reach 20℃.

Keep the water in the breeding pond slightly flowing so that the water quality will not deteriorate.

There are two main ways to cultivate soilless water in plastic greenhouses:

(1) Open. Suitable for building ponds in places with warm water all year round. The advantage is that the flow is stable and suitable for large-scale operations. The breeding pond is made of bricks and cement. The area of ​​each pond is 10 to 20 square meters, the depth of the pond is 40 cm, the width is 1 to 2 meters, and the width of the pond bank is 20 to 40 cm. Two water inlet pipes and two drainage pipes with a diameter of 3 to 4 cm are installed at opposite positions of the pond. The water inlet pipe is at the same height as the bottom of the pond; one drainage pipe is at the same height as the bottom of the pond, and the other is 5 cm higher than the bottom of the pond. Metal mesh is installed at the inlet and drainage pipe openings to prevent escape. Arrange several breeding ponds side by side to form a unit. The area of ​​each unit should not exceed 500 square meters.

(2) Closed loop filtration type. Suitable for use in large cities or places where water is scarce. Its advantages are that the water used for breeding can be reused, the water consumption is low, and the temperature is easy to control, but the investment is slightly larger. The construction method of the breeding pond is the same as that of the open one. In addition, an aeration tank and a sedimentation tank need to be built, and some water purification equipment, pumping equipment and heating equipment need to be added.

The construction of a plastic greenhouse is the same as that of an ordinary greenhouse. It is best to place each unit in the same greenhouse for easy management.

The breeding method of plastic greenhouse soilless water flow breeding is adopted. As long as there is enough feed, the eels will generally not escape due to the clear water quality. However, it is necessary to prevent natural enemies such as rats and snakes from harming. After a period of breeding, the eels in the same pond will be uneven in size and should be separated and raised in time.

3. Eel farming in rice fields

Using rice fields to breed eels is low-cost, easy to manage, and produces both rice and fish. It is an effective way for farmers to get rich and increase their income.

Selection and requirements of rice fields

Rice fields for raising eels should be selected with good water retention properties, low terrain, and convenient water supply and drainage.

The first is to raise and reinforce the ridges to prevent water seepage and leakage; the second is to dig a set of ditches inside and outside the fields, which are 5m wide and 1m deep, and dig a "+" or "井" shaped ditch in the middle of the field, which is 50 cm wide and 30 cm deep and connected to the surrounding ditches; the third is to improve the drainage system and install sturdy fish-blocking facilities at the inlet and outlet to prevent fish from escaping.

Release seedlings

The time is concentrated in mid-to-late April, and the fish should be released all at once. When releasing the fish, they should be soaked in 3% - 4% salt water for 10 minutes to prevent skin abrasions and kill water molds and surface parasites.

Feeding and management

First, feed well. Rice field eels are omnivorous fish that mainly feed on animal bait. While they prey on natural bait in rice fields, they should be fed with pig blood, small fish and shrimps to meet their feeding and growth needs. Second, water quality management should be done well. The water level in rice fields should be kept at about 10 cm normally, and new water should be added regularly. In the early stage, new water should be added once every 3 to 5 days, and once a day in the hot summer. The water depth should be increased by 3 to 5 cm each time water is added to prevent hypoxia. Third, prevent and treat diseases regularly. Use quicklime or bleaching powder to sprinkle the surrounding ditches once every half a month, and use internal medicines such as sulfamethoxazole or fish blood powder to mix feed and feed regularly to prevent diseases such as enteritis.

Capture and wintering

The eel fry with a tail weight of about 50 grams are put in. After more than 5 months of feeding and management, the tail weight of the eel can generally reach about 150 grams, and the large ones can reach more than 200 grams. The capture method is relatively simple. In the early stage, you can use a bamboo eel cage with earthworms and other baits in it to lure the eels. The cage is released in the evening and the fish can be collected in the early morning of the next day. After winter, eels have the habit of hiding in caves and shallow water mud or water plants. If you want to capture them, first remove the water plants, then increase the water level, lead the eels out of the cave, and then drain the field water to capture them. If you keep them in the field for wintering, keep the water depth or humidity of the surrounding ditch at a certain level, or cover the surface of the soil layer with a layer of soft grass, so that they can safely overwinter.

Controlling gender

Controlling the sex of fish is an effective way to increase production. Generally, sex hormones can be used to induce the sex of eels to develop in the direction that people want.

Treating yellow eel fry with the male hormone methyltestosterone can produce more than 99% male fish. The treated fish have a single sex and fixed density, so they not only grow fast but also have low costs, and can generally increase production by about 30%.

The technology of gender control has been developed for many years abroad and is already very mature, but in China this technology remains at the laboratory level, there are no relevant reports on production, and the corresponding national standards have not yet been perfected.

Precautions

1. Selection of seedlings: You must choose eels that are healthy and uninjured, active in swimming, neat in size, thick in muscle, free of parasites on the body surface, and bright yellow in color. Eels with whitish body surface, broken skin, broken tail, or scars on the mouth and gill bones should not be raised.

2. Preparation before stocking: After the eel pond is disinfected and filled with water, the eel can be released when the water temperature reaches above 15℃. Before stocking, the eel should be soaked in 10ppm bleaching powder or 3%-4% salt water for 15-20 minutes to kill the pathogens on its body surface.

3. Disease prevention and control: (1) "Cold" disease. This is caused by a large temperature difference between the new water and the original water. As long as the water temperature is adjusted and stabilized, this disease can be prevented and controlled. (2) Capillaria disease. It parasitizes the eel's body, causing the fish to become emaciated and die, accompanied by edema and red and swollen anus. Use 0.1 grams of 90% crystal trichlorfon per kilogram of eel, mix it into the feed and feed it for 6 consecutive days. (3) Plum spot disease. There are plum-shaped ulcers the size of soybeans on many parts of the eel's body. (4) Because the density of eels in cages is high, when the feed is insufficient, they will bite each other and become infected with mold, grow "white hair" on the body surface, and the sick fish will lose appetite and die. The treatment method is to spray with a mixture of salt water and baking soda. If there is sufficient feed, not only can this phenomenon be avoided, but even if the eels in the same cage have different sizes, they will not cannibalize each other. (5) The feed used in cage culture must be fresh and not spoiled. The remaining rotten and smelly feed in the cage should be removed in time, otherwise it is easy to cause enteritis. Treatment methods include oral administration of sulfonamides, furans or garlic. The feed should be washed and soaked in 200ppm potassium permanganate for 3 minutes before being fed. If artificial compound feed is used, its protein content must reach more than 45%, and maggots and earthworm pulp should be used as bait and domesticated to achieve good results. (6) Eels should be avoided from scratches during fishing, transportation and stocking to prevent bacterial invasion and red skin disease. The symptoms are bleeding and inflammation on the body surface, which are most obvious on the abdomen and sides, and are lumpy. It requires a combination of internal and external disinfection and treatment. Prevention method: Strictly disinfect the eels when stocking. The specific method is to add 50ml of aquatic seedling disinfectant to 100k and soak them for 30 minutes, or soak them in 8% iodine-containing salt water for 10 minutes, then put them in clean water for temporary storage for 1 hour, and then wash them with clean water before putting them in the box.

In addition, water bodies should be disinfected regularly. For disinfection, quicklime can be used at a dosage of 100-150 g/m3, malachite green (CuSO4) at a dosage of 0.7 g/m3, and bleaching powder at a dosage of 10 g/m3.

4. When the eels are placed in a high density in the container during cage culture, the mucus accumulated on the surface of the body will quickly consume the dissolved oxygen in the water through the decomposition of microorganisms in the water, leading to the death of the eels. After being placed in the cage, the eels sometimes tangle with each other, sometimes more than 100 kilograms of eels tangled together, causing a large number of eels to die.