1 There are two sources of fleas and their selection. The first one is to catch larvae in paddy fields and shallow water ditches from April to October every year. The second is purchasing from the market. Whether it is for self-acceptance or purchase, it is better to use cage trapping. The species caught or caught by electric traps have very low survival rate due to injuries in the body. Even if they die, the growth is extremely slow. Therefore, it is absolutely necessary to select disease-free and non-injurious crickets. Kind of stocking. Astragalus can be divided into three types according to its body color. One is body color yellow with large spots, and the increase in meat number is 1:5 to 6, and the growth is faster. The second type is the body surface of blue, the third type of gray and fine spots, the latter two kinds of growth rate is slow, increase the meat ratio of 1:1 to 3, it is not suitable for artificial breeding.
2 The net cage is set to have a cage area of ​​about 20m+2, a net width of 4m, a length of 5m, a net height of 1m, a water part of 40cm, and an underwater part of 60cm. The quality of the network is better, the mesh should be denser, and the nets must be important. The cage is set in a pond with a water depth of 0.8m or more, and new cages should be placed in the water for 3 to 5 days until the harmful substances emitted by the cage disappear. A few days before stocking should be properly cultivated water quality, so that the transparency of about 15 ~ 20cm, so that you can control or reduce the leeches in the pond against the jaundice. The cages can be placed side by side in the pond, and two rows of cages are provided with bamboo frames for walking and feeding management. The setting area of ​​cages should not exceed 50% of the pond area, otherwise it may cause water quality deterioration. The water tanks are placed in the cages, and the water peanuts are the most suitable. The coverage area should cover 90-95% of the area of ​​the cages, which provides a good environment for the growth of Astragalus membranaceus.
3 For the stocking of jaundice, because of the habit of mutual gluttony, it is advisable to have the same specifications when stocking. Each square meter can be stocked with 2-8kg, and each cage is stocked with 40-60kg. A variety of specifications can vary, small size is 10 to 20 per catty, large specifications are 0.1 to 0.4 pounds per end, and up to 1 pound or more per winter, the price is very high. The acquisition and stocking of fleas should be selected from April to early May or from August to September in order to avoid the breeding season of jaundice from mid-May to July, because the acquired jaundice during the breeding season is prone to death due to sexual maturity.
4 Feeding management and breeding in the wild environment, the density is small, wide range of activities, their own food, so within a few days of starting stocking basically do not eat artificial feed or eat very little, to domesticate, if domestication is not successful It will lead to failure of farming. The specific method of domestication is: no feeding within 3 days after stocking, so that all the food in the species is fasted to become an empty stomach, so that it is in a state of starvation, and then in the evening, it is fed with alum and chopped small fish Or animal viscera, feeding amount of 1 to 2% of body weight. Feeding time gradually increased to evening and morning respectively, and the feeding amount gradually increased to 4 to 5% of body weight depending on the eating condition. When the water temperature was 26 to 28°C, the optimum temperature for the growth of Astragalus membranaceus, the feeding amount could increase to 7 ~8%. It is difficult for astragalus to eat habitually after eating a kind of feed and then eat another feed. Therefore, it is necessary to fix several feeds, such as quail, small fish, quail meat or animal viscera, to increase its growth rate. Live feed can be provided when conditions permit, because of its high utilization rate, no need to remove the residual bait, less pollution to the cage, which is conducive to the growth of Astragalus.
5 Matters needing attention
5.1 Anti-steaming. There are three aspects, namely, steaming in the flood prevention cage, preventing steaming during transportation, and preventing steam in the cage. Jaundice due to body surface rich in mucus, high density in the container when placed, the more accumulated mucus through the decomposition of microorganisms in the water, quickly consume the dissolved oxygen in the water, and generate heat to increase the temperature of the water, resulting in Kind of death. After being put into the cage, the species will sometimes be entangled with each other, and sometimes more than 100 kilos of species will become entangled and cause a great deal of death.
5.2 In the wild state, when the water temperature exceeds 32°C, the yellow earthworms sneak into the soil to avoid the heat, and the cage culture changes the original environment. When the water temperature is too high, the low temperature river water should be replaced in time to cool down, otherwise it will cause death. The temperature difference after changing the water should not exceed 3 °C, otherwise it will cause cold disease. When the temperature difference after changing the water exceeds 10°C, it will cause a large number of deaths of Astragalus.
5.3 Due to the high density of cage culture of Astragalus membranaceus, when the feed is insufficient, they will bite each other and cause the infection of mold. In the body surface growth "white hair", the diseased fish lost their appetite and died. The treatment is to use salt water and baking soda mixture.
5.4 Feeds must be fresh, and some of the remaining rot in the cage should be promptly removed. Otherwise, enteritis can easily be caused. Treatments can be taken internally with sulfonamides, furans, or garlic. Before feeding, feed should be washed and immersed in 200ppm potassium permanganate for 3 minutes, and then rinsed with fresh water before feeding. If artificial compound feed is used, the protein content must reach 45% or more, and mash is used as a bait and domesticated to achieve good results. The bait coefficient is: 2 to 3 for pupa, 12 for carcass, snail, 4 to 5 for small trash, 10 for poultry, and 2 for artificial compound feed.
5.5 In the course of fishing, transportation and stocking, the species should be protected from scratches to prevent the invading bacteria from invading red skin disease. The symptoms are bleeding and inflammation of the epidermis. The abdomen and the sides are the most obvious and they are blocky and require internal medicine. Disinfection combined with external medication. Preventive methods: When the stocking is strictly sterilized, the specific method is to add 50ml of aquaculture seed disinfectant in 100kg of water for 30 minutes, or dip in 8% iodine-containing saline for 10 minutes, and then put it in clean water for a period of 1 hour. After cleaning it again, it can be placed in the box.
5.6 The most critical stage of cage culture of Astragalus is within one month after stocking. This period was the process in which Huang Wei changed his original habits and adapted to the new environment. If the method is proper, the survival rate of the species can reach 90% or more. If the method is improper, the survival rate is sometimes below 30% or even all of them are dead. This month, in addition to good disinfection and domestication of fleas, it is also necessary to effectively control the occurrence of diseases. The specific method is to disinfect the pathogens alternately with strong disinfectants and lime to prevent the occurrence of all pathogens.
2 The net cage is set to have a cage area of ​​about 20m+2, a net width of 4m, a length of 5m, a net height of 1m, a water part of 40cm, and an underwater part of 60cm. The quality of the network is better, the mesh should be denser, and the nets must be important. The cage is set in a pond with a water depth of 0.8m or more, and new cages should be placed in the water for 3 to 5 days until the harmful substances emitted by the cage disappear. A few days before stocking should be properly cultivated water quality, so that the transparency of about 15 ~ 20cm, so that you can control or reduce the leeches in the pond against the jaundice. The cages can be placed side by side in the pond, and two rows of cages are provided with bamboo frames for walking and feeding management. The setting area of ​​cages should not exceed 50% of the pond area, otherwise it may cause water quality deterioration. The water tanks are placed in the cages, and the water peanuts are the most suitable. The coverage area should cover 90-95% of the area of ​​the cages, which provides a good environment for the growth of Astragalus membranaceus.
3 For the stocking of jaundice, because of the habit of mutual gluttony, it is advisable to have the same specifications when stocking. Each square meter can be stocked with 2-8kg, and each cage is stocked with 40-60kg. A variety of specifications can vary, small size is 10 to 20 per catty, large specifications are 0.1 to 0.4 pounds per end, and up to 1 pound or more per winter, the price is very high. The acquisition and stocking of fleas should be selected from April to early May or from August to September in order to avoid the breeding season of jaundice from mid-May to July, because the acquired jaundice during the breeding season is prone to death due to sexual maturity.
4 Feeding management and breeding in the wild environment, the density is small, wide range of activities, their own food, so within a few days of starting stocking basically do not eat artificial feed or eat very little, to domesticate, if domestication is not successful It will lead to failure of farming. The specific method of domestication is: no feeding within 3 days after stocking, so that all the food in the species is fasted to become an empty stomach, so that it is in a state of starvation, and then in the evening, it is fed with alum and chopped small fish Or animal viscera, feeding amount of 1 to 2% of body weight. Feeding time gradually increased to evening and morning respectively, and the feeding amount gradually increased to 4 to 5% of body weight depending on the eating condition. When the water temperature was 26 to 28°C, the optimum temperature for the growth of Astragalus membranaceus, the feeding amount could increase to 7 ~8%. It is difficult for astragalus to eat habitually after eating a kind of feed and then eat another feed. Therefore, it is necessary to fix several feeds, such as quail, small fish, quail meat or animal viscera, to increase its growth rate. Live feed can be provided when conditions permit, because of its high utilization rate, no need to remove the residual bait, less pollution to the cage, which is conducive to the growth of Astragalus.
5 Matters needing attention
5.1 Anti-steaming. There are three aspects, namely, steaming in the flood prevention cage, preventing steaming during transportation, and preventing steam in the cage. Jaundice due to body surface rich in mucus, high density in the container when placed, the more accumulated mucus through the decomposition of microorganisms in the water, quickly consume the dissolved oxygen in the water, and generate heat to increase the temperature of the water, resulting in Kind of death. After being put into the cage, the species will sometimes be entangled with each other, and sometimes more than 100 kilos of species will become entangled and cause a great deal of death.
5.2 In the wild state, when the water temperature exceeds 32°C, the yellow earthworms sneak into the soil to avoid the heat, and the cage culture changes the original environment. When the water temperature is too high, the low temperature river water should be replaced in time to cool down, otherwise it will cause death. The temperature difference after changing the water should not exceed 3 °C, otherwise it will cause cold disease. When the temperature difference after changing the water exceeds 10°C, it will cause a large number of deaths of Astragalus.
5.3 Due to the high density of cage culture of Astragalus membranaceus, when the feed is insufficient, they will bite each other and cause the infection of mold. In the body surface growth "white hair", the diseased fish lost their appetite and died. The treatment is to use salt water and baking soda mixture.
5.4 Feeds must be fresh, and some of the remaining rot in the cage should be promptly removed. Otherwise, enteritis can easily be caused. Treatments can be taken internally with sulfonamides, furans, or garlic. Before feeding, feed should be washed and immersed in 200ppm potassium permanganate for 3 minutes, and then rinsed with fresh water before feeding. If artificial compound feed is used, the protein content must reach 45% or more, and mash is used as a bait and domesticated to achieve good results. The bait coefficient is: 2 to 3 for pupa, 12 for carcass, snail, 4 to 5 for small trash, 10 for poultry, and 2 for artificial compound feed.
5.5 In the course of fishing, transportation and stocking, the species should be protected from scratches to prevent the invading bacteria from invading red skin disease. The symptoms are bleeding and inflammation of the epidermis. The abdomen and the sides are the most obvious and they are blocky and require internal medicine. Disinfection combined with external medication. Preventive methods: When the stocking is strictly sterilized, the specific method is to add 50ml of aquaculture seed disinfectant in 100kg of water for 30 minutes, or dip in 8% iodine-containing saline for 10 minutes, and then put it in clean water for a period of 1 hour. After cleaning it again, it can be placed in the box.
5.6 The most critical stage of cage culture of Astragalus is within one month after stocking. This period was the process in which Huang Wei changed his original habits and adapted to the new environment. If the method is proper, the survival rate of the species can reach 90% or more. If the method is improper, the survival rate is sometimes below 30% or even all of them are dead. This month, in addition to good disinfection and domestication of fleas, it is also necessary to effectively control the occurrence of diseases. The specific method is to disinfect the pathogens alternately with strong disinfectants and lime to prevent the occurrence of all pathogens.
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