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Prevention and control of eel diseases by indigenous methods
Under natural ecological conditions, Monopterus albus has strong vitality and disease resistance, while under artificial breeding conditions, due to the increase of feeding density, it is prone to diseases. It is difficult to observe the early onset of Monopterus albus. Once the disease is obviously difficult to cure, therefore, eel breeding should focus on prevention and combine prevention with treatment. This paper introduces some methods of preventing and treating common diseases by indigenous methods.
1. In the early stage of plum blossom spot disease, a small erythema appeared near the wound or the anus of weak eel, and then it expanded into a round or oval spot the size of a bean. In severe cases, all the tails rotted and floated into the water and died. Prevention and control methods: Several toads are often put in the eel pond, and the poisonous juice secreted by them can effectively kill the pathogen of plum blossom needle.
2. Under the condition of high-density feeding with fever, the mucus secretion speed of Monopterus albus is accelerated. If the water is not changed in time or there is a dead angle, it will release high heat due to mucus fermentation, which will lead to the increase of body temperature of Monopterus albus. Ill eels twine and roll with each other, the mucus on the body surface falls off, and the head is swollen and anxious. Prevention and control methods: reduce stocking density, add some loach to the pool, eat the rest of the bait with loach, and roll it up and down to reduce the entanglement of Monopterus albus. In addition, pay attention to changing water.
3. Dermatomycosis This disease is caused by the killing of Monopterus albus due to excessive stocking density and insufficient bait. The mycelium of sick Monopterus albus is spongy, thin and seldom eats, which eventually leads to failure and death. Prevention and control methods: Dissolve salt and baking soda (each accounting for 1/2), which account for four tenths of the weight of the pool water, and then sprinkle the pool water.
4. Monopterus albus patients with capillary nematodes suffer from this disease, mainly because capillary nematodes parasitize the mucosal layer of intestinal wall, destroy the intestinal wall tissue and cause intestinal wall inflammation. Ill eels are weak and eat less. In severe cases, eels often struggle and jump. Control method: Every 100 kg of Monopterus albus is mixed with10g of 90% crystal trichlorfon and 3 kg of bean cake to make pills, and fed continuously for 3-5 days.
5. Hypoxia mostly occurs in hot weather. Due to the high temperature and high oxygen consumption in the eel pond, the eel pond lacks oxygen. At the same time, due to the high water temperature, eels can't probe to breathe air, which leads to frequent probes outside the hole, leading to respiratory dysfunction and eventually failure and death. Precautionary measures: inspect the eel body and eel pond frequently, change the water immediately once you get sick, and strengthen the oxygenation measures with the sediment.
Five ways to solve the problem of Monopterus albus feed
Ensuring sufficient and high-quality feed is the key factor for the rapid and high-yield of Monopterus albus. Monopterus albus is an omnivorous fish with animal feed as its main source, which has a wide range of sources. Therefore, Monopterus albus farmers can use the existing resources to collect and breed live bait.
First, the introduction of cultivated earthworm varieties
Make full use of cow dung, domestic garbage and other raw materials to cultivate earthworms, with Daping No.2, Beixing No.2 and Chizi Aisheng as the best varieties. In order to cultivate earthworms, we can drill/kloc-0 holes with a diameter of 2 cm at the bottom of abandoned wooden barrels and pots and cover them with gauze to facilitate ventilation and drainage; You can also dig a hole in a well-drained and irrigated place or raise it in a brick pool.
Second, cultivate fly maggots.
You can make your own fly cage, buy excellent varieties of houseflies from the fly maggot farm to produce sterile fly maggots, or you can mount the horse in an indigenous way, grind 0.5 kg of soybeans into slurry, pour them into a water tank filled with 40-50 kg of water, add 2.5 kg of fresh pig blood and 10 kg of water and stir them evenly, and the maggots will grow out in a week.
Third, snails are farmed in complete sets.
A number of 4-6 mesh bamboo cages are hung around the culture pond. A certain number of seed snails are enclosed in cages, and 2/3 of the cages are immersed in water, so that most of the young snails can climb out of the cage and feed on Monopterus albus. You can also pick up snails in canals and rice fields, shell them, chop them and feed them to eels.
Fourth, light catches insects.
Hanging two black lights above each eel pond, the upper one is hung at a proper height to attract insects and moths in the distance, and the lower one is lower, preferably 20 cm away from the water surface of the eel pond. When it's just dark, turn on the high-altitude black light. When insects and moths gather around the overhead lamp, turn on the black light on the water surface and turn off the overhead lamp. At this time, high-altitude insects and moths will quickly dive down and gather around the water lights. At the same time, due to the reflection of electric lights in the water, many moths will rush in and die in the belly of eels. When there are few moths and insects over the pool, turn on the black light at high altitude to lure them. Repeated experiments show that 30% of Monopterus albus feed can be obtained by this method in summer and autumn.
5. Collect earthworm provenance.
Dig a shallow pond where there is a drainage ditch. There should be humus mud at the bottom of the pond, and the water depth should be kept at 5-6 cm. If some fermented organic fertilizer is applied regularly, earthworms will multiply in large numbers.
Eel culture technology
In recent years, with the improvement of people's living standards, eel, a valuable aquatic product, has entered the homes of ordinary people, so raising eels is more beneficial. The following is a brief introduction to eel culture technology for farmers' reference:
Release eels. Monopterus albus is a temperature-changing animal. As long as the water temperature is suitable (10-32℃), it can be stocked all year round. Free-range eels require good health, active swimming, no disease or disability, and no limit to size. Because eels bully the small, bully the weak and bite each other without food, the specifications of eels raised in the same pond should be the same. Generally, people who weigh more than 100-350g can be put into the pool for sale at any time; A person weighing more than 50 grams can grow to the commodity specifications of the year when put into the cultivation pool; Less than 50 grams can be put into the nursery pond, which can grow to more than 50 grams in the same year, which can provide large-scale eel species for raising eels in the next year. The stocking density should be flexibly controlled according to stocking specifications and feeding conditions, generally, it is 1-5 kg per square meter of water surface, and the pond for sale can be dense and the seed pond can be thin.
Feed the bait. Eels mainly feed on animal food and like to eat fresh food, such as various insects and their larvae, earthworms, small fish and shrimp, silkworm chrysalis, maggots, snails, mussels, large zooplankton, internal organs of livestock and poultry and tadpoles. The suitable water temperature for eel feeding is 15-30℃, and it has the habit of hunting food in the daytime and at night. If the plastic film greenhouse is used to cover the fish pond in winter or other heating and insulation measures are taken to keep the appropriate water temperature, eels can eat and grow all year round, which greatly shortens the growth period, reduces the cost and improves the yield and benefit.
Eels enter the pond. After short-term adaptation (1-2 days), the bait can be fed, and the amount of oral bait is generally 2%- 10% of the total weight of fish. The amount of bait should be increased or decreased according to the water temperature, bait quality and water quality. Generally feed 1 time every day. Feed at 4-5 pm or at night. You can also domesticate it to eat in the daytime gradually in advance of feeding time, and feed it 1 time at 8 am and 4-5 pm respectively.
The bait should be fresh and not rancid, and some plant bait, such as bean cake, bran or corn flour, can be fed in places where animal bait is insufficient. The above plant bait can be mixed with minced fish and shrimp to form a wet mass (which cannot be dispersed in water for a long time) and then fed. The bait should be palatable, and the larger bait should be chopped or hung in the pool to tear. Hard-shell bait such as snails, mussels and clams must be crushed before being released. Bait should be fed at fixed points, with 2-8 feeding points in each fish pond. Remove the residual bait before feeding to avoid affecting the water quality.
Before eels enter the pond, a small amount of fermented and decomposed organic fertilizer can be applied to cultivate chironomid larvae, silkworms, aquatic insects and other aquatic animals, or snails or loaches can be put into the pond for cultivation to provide fresh bait for fresh fish. Where conditions permit, black lights can be set in the pool to lure insects into the pool.
According to the data, raising 6-8kg earthworm or 1 0kg mussel meat or snail meat can produce1kg eel.
Adjust water level and water quality. Because eels can breathe oxygen directly in the air, they need to stick their heads out often.
Water surface Therefore, the water level in the eel pond should be shallow. The water level should be determined according to the specifications of the eel, and the water level in the fry pond should be shallow, generally 10-20cm. The culture pond can be deeper, generally 30-40 cm. The pool for sale can be very shallow.
Eels consume a lot of oxygen and like fresh water. So always inject fresh water. Generally, the water is changed 1-2 times a month in winter, 1 times a week in spring and autumn, and 1 times every 1-3 days in summer, with a water change rate of 20%-50% each time. Where conditions permit, micro-flow water can be formed in the eel pond. In hot season, the number of water changes should be increased, or loofah and grapes should be planted beside the pool to prevent sun exposure, cooling and heatstroke prevention. A small amount of omnivorous fish, such as tilapia, carp, crucian carp and loach, can be mixed in the large and deep eel pond, which can remove the residual bait feces and purify the water quality.
Through the screening pool. The competition among eel species is fierce. After feeding for a period of time, the fish of the same specification will be uneven, which is not conducive to the improvement of yield in the long run. Therefore, during the growth period of eels, all eels in the pond should be caught once every 1 month, and after screening, they are kept in different ponds in three sizes: large, medium and small. Before the end of the autumn growing season, all the fish should be caught, and the fish that meet the commodity specifications should be put into the pool for sale. Other fish with different specifications should be stocked in different pools according to the production needs in the coming year. In this way, after a winter adaptation, eel species can enter a prosperous period early next year.
Prevention and treatment of fish diseases. Eel ponds must be cleaned and disinfected with quicklime or bleaching powder before sowing. Immigrant eels must be soaked in bleaching powder solution with a concentration of 1 million or 3% salt solution for disinfection 10-20 minutes before entering the pond. During the feeding period, the whole pool is sprinkled with bleaching powder at a concentration of 1 million per month. Morchella skinless in the mop pool has certain effect on white spot disease and skin rot.
Prevent escape and injury. The eel pond is small and shallow. When pouring fresh water, you should prevent the fish from escaping. The water surface of the fish pond should be controlled below 20 cm along the edge of the pond, and the fishing net cloth and the pond wall should be checked at any time.
Degree of firmness. Especially in the case of food shortage, thunderstorm, long rainy weather or water quality deterioration, eels are the easiest to escape, so we should pay more attention to escape prevention at this time. In addition, we should also guard against the harm of ducks, rats, cats and other enemies to eels.
Overwintering management. Generally, after June 165438+ 10, when the water temperature drops below 15℃, Monopterus albus begins to burrow into the deep soil layer and go into hibernation until February-March of the following year. In winter, the pool to be sold should be heated and insulated. Eels that failed to meet the commercial specifications in that year can overwinter in the original pond and maintain a high water level during the overwintering. Especially when the water freezes, the water depth under the ice should be kept above 0.3m, and the pool water should be changed 1 time every month. Dry overwintering can also be adopted, that is, when the water temperature drops below 10℃, the water in the pond is drained, and some wheat straws or straws are covered at the bottom of the pond to keep the soil moist and unfrozen, so that Monopterus albus can safely overwinter. Where there is a heat source, keep the water temperature at 25-30℃ all year round, so that eels can avoid hibernation and grow all year round.
Domestication of wild Monopterus albus fry
When wild eel fry are cultured artificially and fed with new fresh bait such as earthworm, small miscellaneous fish, mussel, snail and insect in a small scale and low density, eel can quickly form a feeding habit. However, in large-scale (1 1,000 square meters or more) and high-density (1 kg/square meter or more) culture, feeding this bait has obvious shortcomings, such as the difficulty in stabilizing the bait for a long time.
Fixed supply, high feed coefficient, etc. Therefore, large-scale artificial culture of Monopterus albus must be domesticated artificially to make it eat artificial compound bait. At present, Monopterus albus furnace has been used to produce special feed in China, which has the advantages of high feeding rate, fast weight gain and low feed coefficient. The specific operation of domestication is as follows:
First, the preparation work before domestication
(1) mussels. Buy fresh mussels and keep them in the pond for a while. ⑵ Special compound bait for Monopterus albus. (3) freezer. Mytilus meat is frozen before use. (4) Meat grinder (large). Equipped with 2 pairs of die holes (6~7 mm sold randomly, 1 3~4 mm die holes need to be made by yourself). 5] 1 .5 kw single-phase motor1set.
Second, the domestication method
Fresh mussel meat was selected, frozen, and processed into minced meat with a meat grinder and a 6~7 mm die hole. Mix minced meat with water and sprinkle evenly. Feed 1 time at 5~7 pm every day, and the feeding amount should be controlled within 1% of the total number of Monopterus albus. This food intake is far lower than the satiety of Monopterus albus, so Monopterus albus is always hungry, so as to establish the centralized feeding conditioned reflex of Monopterus albus population. Three days later, it was observed that Monopterus albus ate vigorously and was fed at a fixed point instead. Generally, 4~6 points are set every 20 square meters, and the feeding amount is still 1% after feeding for 2 days. At this time, the eel can basically be eaten in 3 minutes. On the sixth day, the artificial compound bait was changed and fed at 5~7 pm every day 1 time. When feeding, it is directly sprinkled into the designated feeding area, and the feeding amount is 2% of the weight of eel fry, and it should be eaten within 15 minutes to improve the utilization rate of bait.
3. Development of artificial compound feed for Monopterus albus.
The special feed produced by the feed factory cannot be directly fed, and must be prepared first. Add 35% fresh mussel meat (processed by a 3-4 mm meat grinder) and a proper amount of wanlongwu (digestive function promoter of Monopterus albus) to 65% special feed for Monopterus albus, fully stir it by hand or blender to form dough, and then press it into soft strip bait with a diameter of 3-4 mm and a length of 3-4 mm with a 3-4 mm die grinder. The feeding effect of the bait thus prepared is very ideal. Large-scale culture with soil, the bait coefficient is 3; In running water soilless industrial culture, the feed coefficient can be reduced to 2~2.5.
Temporary fattening technology of Monopterus albus
Monopterus albus, also known as eel, is widely distributed in China and has high nutritional value and medicinal value. The meat is sweet and warm, and has the effects of expelling wind and removing dampness, tonifying deficiency, treating hemorrhoid and leakage, and treating dysentery. Its bloody taste is salty and warm, and it has the function of dispelling wind and strengthening yang. The treatment of tinea, fistula and Monopterus albus is increasingly welcomed by consumers. However, with the development of fishing tools such as fishing, cage fishing and electric fish, the wild resources of Monopterus albus are overfished, and the natural resources of Monopterus albus are increasingly scarce, with more natural provenances and smaller specifications. Temporary rearing of Monopterus albus, short-term fattening and temporary rearing of small-sized Monopterus albus can not only improve the listing specifications, but also regulate the market, with small investment, high income, quick income and relatively small risk. Earn the seasonal price difference skillfully, and the economic benefit is very considerable.
1. The artificial propagation technology of Monopterus albus failed to pass the standard. Seedlings mainly come from natural waters or seeds bought in the market, which require healthy and harmless seedlings, muscular, free from parasites, dark yellow and large spots.
2. It is required to build a temporary pond near the water source, the area should not be too large, generally15 ~ 20m2. Apply 0. 1 kg quicklime per square meter and inject water for disinfection. The bottom of the pond is covered with a cage made of woven net, and rape and corn stalks are evenly covered on the cage, so that the natural thickness is 15 ~ 20cm. At the same time, sprinkle a small amount of quicklime, and then spread 20cm thick hard mud and 10cm thick mud. The four corners of the cage are fixed with piles. In order to prevent Monopterus albus from escaping, a net was sewn on the four corners of the cage. Monopterus albus is a temperature-changing animal. In order to spend the summer safely, a canopy must be set up above the eel pond. The concrete method is to plant tall plants such as loofah or corn along the pond with bamboo as the skeleton to form a green barrier with shading, cooling and oxygen-increasing functions for the eel pond. The stocking specification of eel species is 20 ~ 30/kg, and it is disinfected with 5% ~ 10% salt solution 10 minute before stocking. The stocking density is controlled at about 5 kg/m2, and a small amount of loach is stocked at the ratio of 10: 1.
3. Daily management The water in the eel pond is 20 cm deep, with clean water quality and no peculiar smell. Generally, change the water once every three days, and change the water more than 1/3 each time. Change the water once a day in midsummer, and use the same temperature change method. Monopterus albus likes earthworms best, and also eats maggots, Tenebrio molitor, moths, mussels, small fish, snails and so on. And generally do not eat compound feed. The daily food intake is about 6% of the body weight of Monopterus albus. Feed it once a day, before evening. During the breeding period, an electric lamp is hung on the shed frame of the eel pond, and the light bulb is about 40 cm away from the water surface. At night, insects will be attracted by light, which is convenient for eels to prey.
4. Prevention and escape From the perspective of prevention and treatment of eel diseases, once eels get sick, general drugs are difficult to control. Therefore, we should adhere to the principle of combining ecological prevention with drug prevention. YEATION seedlings. Change the water frequently, and often remove the waste gas at the bottom. Feeding garlic and earthworm regularly can effectively inhibit the occurrence of various diseases of Monopterus albus. In high temperature season, spraying furazolidone solution on earthworm body surface regularly for feeding can also play a role in disease prevention. At the same time, the whole pool is disinfected regularly with 5ppm bleaching powder. Patrol the pond in the morning and evening to fish out sick eels in time. Check the mesh frequently, repair the holes in time to prevent escape.
Grasp the "six customs" of cage culture of Monopterus albus
Cage culture of Monopterus albus is a culture method with less investment, quick effect and convenient management. In recent years, our county and its surrounding areas have developed rapidly and achieved good economic benefits. However, there are also some problems in aquaculture, which make farmers suffer losses to varying degrees. In order to further develop the cage culture of Monopterus albus, combined with the reality of our county, this paper talks about the problems that should be paid attention to in cage culture of Monopterus albus, and generally speaking, we should handle the "six customs" well.
1 Pool selection passed
Monopterus albus is naturally warm, sheltered from the wind, light and shock, so it is necessary to choose a pond with sufficient sunshine, shelter from the wind, convenient water source and less external interference for cage culture of Monopterus albus. The area is 667- 1000m2, the water depth is about 1.5m, and the water level is relatively stable. Before stocking eel species, the pond should be thoroughly cleaned and disinfected with quicklime 100- 120kg/667m2.
2 Cage specifications and insertion clearance
The cage covers an area of 20 ~ 30m3 and is made of polyethylene net. It is a rectangular hexagonal box with a height of 1.2m, and its length and width depend on the pond. The cage is set in the center of the pond, the four corners are fixed with bamboo, the four sides are tied with bamboo, and the bamboo is hinged with the four corners, so that when the water rises, the cage can rise and the water falls. The submerged depth of the cage is 0.8m, and the upper edge of the cage is 0.4m higher than the water surface, so as to prevent the eel from escaping and do a good job in the daily management of the pontoon bridge. The total area of cages should not exceed 50% of the pond area. 1 One week before stocking eel species, put the cage into the water to allow some algae to adhere to the cage to avoid the damage caused by the friction between the eel body and the net. At the same time, aquatic plants such as water peanuts are kept in the box, and the coverage area of aquatic plants reaches 80% ~ 95%.
3 eel breeding pass
At present, the larvae of Monopterus albus come from the captured wild larvae, and the cage catching effect is good. If you buy it from the market, you should choose one that is physically strong and free from illness and injury. All eel species caught by electric fish with enteritis and red anus should be eliminated. When observing the body color of eel species, yellow is generally the best, that is, the back of eel seedlings is dark yellow with dark brown spots, followed by cyan eel, and gray eel is not suitable for eel species. Stocking time: the first half of the year is from April to May, and the temperature is 20-25℃. The temperature over 30℃ will affect the survival rate of eel species, and the specification of eel species is 5- 10 per kilogram. In the second half of the year, it is best to raise eel fry that were bred in the same year to cultivate eel species. When stocking, it must be divided into boxes, and the size of the same cage should be uniform. Each cage should be stocked at one time, and the stocking density is 4 kg per square meter.
Step 4 tame and feed
Eel species put into cages for the first time must be domesticated and fed for a period of time. The method of domestication and feeding is: eel species are not fed for 3 days, and after the eel moves normally, it begins to feed at night. Choose earthworms, small fish, mussels, etc. Which does Monopterus albus like best? Feed it gradually in advance every day until it eats normally. The daily feed is mainly fresh small miscellaneous fish, followed by earthworms, silkworm chrysalis, mussel meat, tadpoles, cooked pig blood, animal offal, bean cakes and so on. , twice a day, 6-7 am and 17- 18 pm. At first, the feeding amount was calculated according to 2%-3% of eel weight, and then it gradually increased to 6%. Step by step feeding is the best way to feed. Fresh small miscellaneous fish and other feeds bought in the market must be washed before feeding and soaked in 30-50g/L salt solution 10-20min.
5 Daily management
The water used for cage culture of Monopterus albus should have certain fertility, and the transparency should be controlled between 15-20 cm. Too clear water affects the growth of Monopterus albus. In order to improve the water quality and increase the utilization rate of ponds, carp, silver carp, bighead carp and grass carp should be planted outside the box in time, and the intercropping of carp can also eliminate the enemy harm of Monopterus albus. Observe regularly at ordinary times and check the bottom of the box regularly. If dead eels are found, they should be fished out in time. Once the cage is broken and the eel is sick, it should be repaired and treated immediately.
6 disease prevention
Before stocking, the eel was soaked in 30-50g/L salt solution for 65-438+00-20min. Usually, when the water quality becomes worse, the whole pool is splashed with bleaching powder. There are two common diseases of Monopterus albus: a) enteritis, which is caused by eating deteriorated feed or overeating. The body becomes black and blue, the intestines are congested and inflamed, and the anus is red and swollen. Control method: each kilogram of Monopterus albus is mashed with 50g of garlic and 50g of salt for 3-5 days; B) Dermatomycosis is caused by body surface injury of Monopterus albus. Monopterus albus rob each other for food and bite each other. After being injured in a cage, the eel is infected with mold, and its body length is "white hair" until it dies. Control method: spray 2% malachite green solution on the whole pool.
New techniques of male seedling raising of Monopterus albus
Rao Lu, No.1 Agricultural Division of Xinjiang Production and Construction Corps
Monopterus albus is an animal with sex reversal characteristics. In the growth stage, it is female at first, and then becomes male. In the female stage, the individual is small and grows slowly. After changing to male, the growth rate is obviously accelerated. Generally speaking, the growth rate of the female stage of Monopterus albus is only about 30% of that of the male stage, that is, the growth rate and weight gain rate of the male stage are more than twice that of the female stage. Therefore, in the fattening of commercial eel, early male eel breeding technology can achieve good technical and economic benefits. Male eel
The technical points of seedling raising are as follows:
First, the masculine object:
1. Monopterus albus seedlings can be emasculated from the disappearance of the yolk sac under the abdomen in summer flowering, with the best effect and the shortest emasculation period;
2. The effect of masculinization at seedling stage is also good when the individual weight is 20 grams, but the medication time is longer; Young people over 3.50 grams can still be masculine, but it needs to be done in autumn, and the effect is obvious after spring supplementary application 10; 4. 100g can accelerate the return to males, but it is not suitable to apply pesticides during spawning.
Second, the application method:
1. Summer flowers are not fed two days before application. On the third day, after the yolks are cooked, the yolks are developed into paste, and 2.5 ml of alcohol solution containing 1 mg methyltestosterone is added to every two yolks, and then the mixture is stirred and fed, subject to an excessive amount. After 6 days of continuous feeding, the egg yolk was replaced with earthworm meat, and the dosage was 2 mg per 50 grams of earthworm (lightly dissolved in 5 ml of alcohol). After continuous feeding 15 days, the drug was stopped. Generally speaking, after the application of summer flowers is masculine, there will be no female state. For the sake of reliability, when the individual's weight reaches 10g, 15 days can be used without increasing the dose.
2. If the seedlings weighing more than 15g are masculinized, the dosage is 500g live earthworm and 3g pesticide. After continuous feeding for one month, it was completely masculine.
Third, matters needing attention:
1. The male object is an excellent variety specially bred, and its individual annual weight gain can reach 350 grams, but the weight gain of wild species is not obvious.
2. At the beginning, the dose should not be too large, and it can be gradually increased to the allowable amount.
3. When feeding, the dining table area is larger than usual to avoid competing for uneven food;
4. Disinfectant should not be used in the pond during masculinization, but quicklime can be used, and the dosage can be 5 ppm ~ 20 ppm, 5 ppm ~ 10 ppm in spring and autumn, and 10 ppm ~ 20 ppm in summer. Before application, some holes can be inserted in the nest soil to facilitate the discharge of harmful gases.
5. The consumption of male improved eel increased greatly, accounting for 10% of body weight, but the feed conversion rate and weight gain rate increased significantly. 3 kg fresh earthworm Daping 2 can gain 0.5 kg eel meat; 2 kg Tenebrio molitor can gain weight 1 kg eel meat. It can be fattened and sold in 7 months. Because of the high weight gain rate, the eel body is strong in advance, thus improving the disease resistance and increasing the stocking density. Therefore, male seedling raising is also one of the effective measures for artificial close planting of Monopterus albus.