Several common diseases of sea crab

The death of shellfish crabs during shelling showed that there was a large number of deaths (dehulling) of crabs before shelling, and many seawater crabs died after shelling (destruction of the body after shelling, soft shell hardening, etc.) ). Reasons for the death of seawater crabs in the shelling period are: (1) The water body is contaminated, and the dissolved oxygen is low, affecting the shelling and leading to death; (2) The nutrition of the crabs is not balanced (such as calcium deficiency, phosphorus, magnesium, zinc, iron, vitamins, etc.) (3) Some stimulating drugs are used in the shelling phase and some of them will be dead; (4) The pH is too low or too high to be in the proper pH range (suitable pH is 7.8 to 8.4); (5 ) The ecdysone content in seawater crabs does not meet the requirements for normal shelling; (6) The shelling activities are hindered when seawater crabs are sick; (7) The crabs that are parasitized by ciliates sometimes cause off. (8) Shelling, water temperature, water level, salinity and other factors change too much. Treatment method: For the above reasons for different treatment: (1) pay attention to changes in water quality, improve water quality or spilled oxygen to increase the dissolved oxygen in the pond to provide dissolved oxygen required for shellfish crab shelling. (2) Add more crabs to the bait to balance the nutrition in the body. Quanchiposa hard shell treasure, increase the content of trace elements, enhance disease resistance, and promote shelling; (3) During the peak of shelling, avoid Splashing irritating drugs (such as quicklime, triclosan disinfectant, algaecide, green muddy medicine, copper sulfate, etc.) in the water; at the same time, the number of operations in ponds should be reduced to prevent seawater crabs from being frightened; ( 4) Adjust the seawater to an appropriate pH range; (5) Find ciliates promptly clean ciliates with crayfish ciliate, fibroin net, or crab nets; (6) Preclimate (3-5) Day) Replace the fresh seawater with Dr. Hai Super Microorganisms to regulate water quality; 2. What are the foods for sea crab? Seawater crabs are mostly based on natural baits, such as small shellfish, small junk fish, small crabs, barnacles, snails, and snails. Frozen fish, etc., can also be fed animal viscera, artificial compound feed is also being tried. What does g/1000L mean? On many data we will see a word of 1000 g/g which indicates the concentration of a substance in water. The concentration of 1 g of dissolved substance in 1 tonne of water is 1 g/1000 L, which means 1 g/m3 of water. The concentration is 1g/1000L. Similarly, a concentration of 5 g/1000 L is 5 g/m3 water body. Then, with this concentration, the dosage of 1 mu of water at a depth of 1 meter: 5 g/m3 of water, 666 square meters, 1 m water depth = 3330 g. 4. What are the factors related to the occurrence of seawater crab disease? In the process of breeding, seawater crabs always have many diseases. The light will affect the growth of sea crabs, and in severe cases it will lead to a large number of deaths, which will bring serious losses to the aquaculture production. So how do these diseases occur? After a long-term investigation and research, it has been found that all of these diseases are related to the following factors: the quality of the water environment, the health status of marine crabs, and the pathogenic organisms in the water (or the bottom of the pool). The occurrence of all diseases is related to these three factors. Together, they cause various problems in the breeding process of marine crabs. At the same time, the three are mutually reinforcing, that is to say, when the water environment deteriorates, the pathogenic organisms in the water will inevitably greatly increase. At this time, the constitution of the shrimp and crab will become weak due to the poor water quality. Therefore, the disease will be produce. In the actual production process, we can analyze the problem from the above three aspects. 5. What is the relationship between seawater crab disease and pathogenic organisms in the water environment? In addition to nutritional diseases (diseases caused by malnutrition), almost all diseases are associated with pathogenic organisms in the water. Pathogenic organisms include: bacteria, fungi, parasites, viruses, etc. There are all kinds of pathogenic organisms in the normal aquaculture waters, and three things need to be noted: (1) In a good body of water, the number of these pathogenic organisms is very small and does not cause seawater crabs to become sick, so it is usually not (2) The pathogenic organisms (bacteria and viruses) in the water will multiply when the water quality is poor, and a large number of pathogenic organisms will infect healthy sea crabs, causing them to become sick; (3 ) Healthy sea crabs are generally not susceptible to disease even when there are a large number of pathogenic organisms in the water. The key is that most of the crabs do not have a good constitution. Diseases such as rotten gizzards, black gills, rotten limbs, enteritis, rot shells (carapace ulcers) and other diseases are all caused by bacteria; ciliate disease is caused by parasites; fungal disease is caused by fungi; yellow water disease, white water Disease is caused by a combination of factors. 6, how do the seawater crab got yellow water disease, whitewater disease? Because yellowwater disease and whitewater disease in seawater crabs are caused by a combination of factors such as bacteria and viruses, treatment is relatively difficult. However, in the early stages of disease, the internal organs are not unfit for medical treatment. In this case, take oral medicine as soon as possible. Addition of external methods can also save some loss, that is, add crab disease and antibacterial antiviral herbicide to kill star or triple yellow powder in the feed to enhance its antibacterial and antiviral ability, while external use of poisonous clear, double-stranded quaternary ammonium salt Iodine and other thorough disinfection of the entire pool. However, once the disease reaches the end of the viscera fester, it is inseparable. Therefore, this disease focuses on prevention. It is often sterilized with bactericidal agents or aquatic products such as bromochlorohydantoin, and the crabs used for feeding are often supplemented with multidimensional crabs and crabs. Sick Kang, three yellow powder or bacteria kill star, enhance the resistance of sea crab to disease resistance. Yellowwater disease and whitewater disease in seawater crabs are often caused by changes in cultured water quality, which are caused by the large number of nocturnal insects in the sea area. Such ponds often have water quality and blackish odor in the bottoms of ponds, and are often prone to occur in the hot summer season. Therefore, the prevention and control of these diseases must begin with the improvement of water quality or the killing of Noctiluca by use of bacteria, we can use Quanchiposa microorganisms to purify the water quality of ponds, quickly degrade the organic matter, humus, and ammonia in the pool water. Nitrosonitrogen and other toxic and harmful factors. At the same time, the main mechanism for increasing oxygen in the whole pool is to rapidly increase the water quality and to destroy the dissolved oxygen at the bottom of ponds that are already severely deficient in oxygen, and to quickly collect toxic substances such as hydrogen sulfide, ammonia nitrogen, and nitroso nitrogen in the sediments of the ponds. Oxidation reduces the toxic effects of these toxic factors on benthic sea crabs. Through these means, the condition of ponds that have damaged water quality can be quickly changed and disease occurrence eliminated. 7. I am a sea-water crab farmer. I would like to ask why my sea crabs are frequently severely affected after using some disinfectants and internal medicines on the market. Nowadays there are many kinds of drugs in the market, many of which are produced by informal manufacturers. There is no quality assurance. In addition, some internal medicines and disinfectants are products developed by the manufacturers for freshwater aquaculture. As seawater has a large buffer capacity for drugs, Therefore, there has been no effect, at this time should use some of the regular manufacturers of disinfectants and internal medicine, water quality improver to buy. At the same time, in the explanation of these products, we must clearly understand the target of use, and the key is to treat the person with symptoms at the time of onset so as to avoid indiscriminate use of drugs. Otherwise, it will not only waste money but also delay the treatment of the disease, resulting in unnecessary losses. 8. What are white crabs, thin crabs, crabs, red crabs? White Crab: Unmatched female crabs, individuals ranging from 150 to 200 grams. The main feature is that the abdomen is grayish black. Observed under strong light, the larynx is not clear from the base of the eye to the 9th side of the carapace on both sides of the shell. contour. White crabs should be stocked with male crabs at a ratio of 3:1 or 4:1 (male/males) to be mated and bred. After a reproductive oyster shell, shellfish during the shelling period will show signs of death. Former seawater crabs will have a large number of deaths (without shelling), and many seawater crabs will die after shelling (consumption of the body after shelling is too large, the soft shell does not harden, etc.). Reasons for the death of seawater crabs in the shelling period are: (1) The water body is contaminated, and the dissolved oxygen is low, affecting the shelling and leading to death; (2) The nutrition of the crabs is not balanced (such as calcium deficiency, phosphorus, magnesium, zinc, iron, vitamins, etc.) (3) Some stimulating drugs are used in the shelling phase and some of them will be dead; (4) The pH is too low or too high to be in the proper pH range (suitable pH is 7.8 to 8.4); (5 ) The ecdysone content in seawater crabs does not meet the requirements for normal shelling; (6) The shelling activities are hindered when seawater crabs are sick; (7) The crabs that are parasitized by ciliates sometimes cause off. (8) Shelling, water temperature, water level, salinity and other factors change too much. Treatment method: For the above reasons for different treatment: (1) pay attention to changes in water quality, improve water quality or spilled oxygen to increase the dissolved oxygen in the pond to provide dissolved oxygen required for shellfish crab shelling. (2) Add more crabs to the bait to balance the nutrition in the body. Quanchiposa hard shell treasure, increase the content of trace elements, enhance disease resistance, and promote shelling; (3) During the peak of shelling, avoid Splashing irritating drugs (such as quicklime, triclosan disinfectant, algaecide, green muddy medicine, copper sulfate, etc.) in the water; at the same time, the number of operations in ponds should be reduced to prevent seawater crabs from being frightened; ( 4) Adjust the seawater to an appropriate pH range; (5) Find ciliates promptly clean ciliates with crayfish ciliate, fibroin net, or crab nets; (6) Preclimate (3-5) Day) Replace the fresh seawater with Dr. Hai Super Microorganisms to regulate water quality; 2. What are the foods for sea crab? Seawater crabs are mostly based on natural baits, such as small shellfish, small junk fish, small crabs, barnacles, snails, and snails. Frozen fish, etc., can also be fed animal viscera, artificial compound feed is also being tried. What does g/1000L mean? On many data we will see a word of 1000 g/g which indicates the concentration of a substance in water. The concentration of 1 g of dissolved substance in 1 tonne of water is 1 g/1000 L, which means 1 g/m3 of water. The concentration is 1g/1000L. Similarly, a concentration of 5 g/1000 L is 5 g/m3 water body. Then, with this concentration, the dosage of 1 mu of water at a depth of 1 meter: 5 g/m3 of water, 666 square meters, 1 m water depth = 3330 g. 4. What are the factors related to the occurrence of seawater crab disease? In the process of breeding, seawater crabs always have many diseases. The light will affect the growth of sea crabs, and in severe cases it will lead to a large number of deaths, which will bring serious losses to the aquaculture production. So how do these diseases occur? After a long-term investigation and research, it has been found that all of these diseases are related to the following factors: the quality of the water environment, the health status of marine crabs, and the pathogenic organisms in the water (or the bottom of the pool). The occurrence of all diseases is related to these three factors. Together, they cause various problems in the breeding process of marine crabs. At the same time, the three are mutually reinforcing, that is to say, when the water environment deteriorates, the pathogenic organisms in the water will inevitably greatly increase. At this time, the constitution of the shrimp and crab will become weak due to the poor water quality. Therefore, the disease will be produce. In the actual production process, we can analyze the problem from the above three aspects. 5. What is the relationship between seawater crab disease and pathogenic organisms in the water environment? In addition to nutritional diseases (diseases caused by malnutrition), almost all diseases are associated with pathogenic organisms in the water. Pathogenic organisms include: bacteria, fungi, parasites, viruses, etc. There are all kinds of pathogenic organisms in the normal aquaculture waters, and three things need to be noted: (1) In a good body of water, the number of these pathogenic organisms is very small and does not cause seawater crabs to become sick, so it is usually not (2) The pathogenic organisms (bacteria and viruses) in the water will multiply when the water quality is poor, and a large number of pathogenic organisms will infect healthy sea crabs, causing them to become sick; (3 ) Healthy sea crabs are generally not susceptible to disease even when there are a large number of pathogenic organisms in the water. The key is that most of the crabs do not have a good constitution. Diseases such as rotten gizzards, black gills, rotten limbs, enteritis, rot shells (carapace ulcers) and other diseases are all caused by bacteria; ciliate disease is caused by parasites; fungal disease is caused by fungi; yellow water disease, white water Disease is caused by a combination of factors. 6, how do the seawater crab got yellow water disease, whitewater disease? Because yellowwater disease and whitewater disease in seawater crabs are caused by a combination of factors such as bacteria and viruses, treatment is relatively difficult. However, in the early stages of disease, the internal organs are not unfit for medical treatment. In this case, take oral medicine as soon as possible. Addition of external methods can also save some loss, that is, add crab disease and antibacterial antiviral herbicide to kill star or triple yellow powder in the feed to enhance its antibacterial and antiviral ability, while external use of poisonous clear, double-stranded quaternary ammonium salt Iodine and other thorough disinfection of the entire pool. However, once the disease reaches the end of the viscera fester, it is inseparable. Therefore, this disease focuses on prevention. It is often sterilized with bactericidal agents or aquatic products such as bromochlorohydantoin, and the crabs used for feeding are often supplemented with multidimensional crabs and crabs. Sick Kang, three yellow powder or bacteria kill star, enhance the resistance of sea crab to disease resistance. Yellowwater disease and whitewater disease in seawater crabs are often caused by changes in cultured water quality, which are caused by the large number of nocturnal insects in the sea area. Such ponds often have water quality and blackish odor in the bottoms of ponds, and are often prone to occur in the hot summer season. Therefore, the prevention and control of these diseases must begin with the improvement of water quality or the killing of Noctiluca by use of bacteria, we can use Quanchiposa microorganisms to purify the water quality of ponds, quickly degrade the organic matter, humus, and ammonia in the pool water. Nitrosonitrogen and other toxic and harmful factors. At the same time, the main mechanism for increasing oxygen in the whole pool is to rapidly increase the water quality and to destroy the dissolved oxygen at the bottom of ponds that are already severely deficient in oxygen, and to quickly collect toxic substances such as hydrogen sulfide, ammonia nitrogen, and nitroso nitrogen in the sediments of the ponds. Oxidation reduces the toxic effects of these toxic factors on benthic sea crabs. Through these means, the condition of ponds that have damaged water quality can be quickly changed and disease occurrence eliminated. 7. I am a sea-water crab farmer. I would like to ask why my sea crabs are frequently severely affected after using some disinfectants and internal medicines on the market. Nowadays there are many kinds of drugs in the market, many of which are produced by informal manufacturers. There is no quality assurance. In addition, some internal medicines and disinfectants are products developed by the manufacturers for freshwater aquaculture. As seawater has a large buffer capacity for drugs, Therefore, there has been no effect, at this time should use some of the regular manufacturers of disinfectants and internal medicine, water quality improver to buy. At the same time, in the explanation of these products, we must clearly understand the target of use, and the key is to treat the person with symptoms at the time of onset so as to avoid indiscriminate use of drugs. Otherwise, it will not only waste money but also delay the treatment of the disease, resulting in unnecessary losses. 8. What are white crabs, thin crabs, crabs, red crabs? White Crab: Unmatched female crabs, individuals ranging from 150 to 200 grams. The main feature is that the abdomen is grayish black. Observed under strong light, the larynx is not clear from the base of the eye to the 9th side of the carapace on both sides of the shell. contour. White Crabs should be stocked with male crabs at a ratio of 3:1 or 4:1 (male/males) to allow mating. After one time of reproductive oyster shells, 40-50 days of broilers can be reared to grow into a crab. . Thin Crabs: female crabs that were first mated, individuals more than 250 grams, observed under strong light, both sides of the carapace from the base of the eye shank to the ninth lateral tooth with a half-moon ovary outline, which is transparent from top to bottom, this is Ovarian mature expansion range. Such crabs can become full-blooded blue crabs for 30-40 days. Crabs: female crabs that have been mated for nearly 1 month. The ovary has begun to mature and expand, but it has not yet spread to the edge of the carapace. When viewed under light, some transparent places can be seen as a half-moon curve. The dots above the abdomen of the abdomen turn from milky white to yellow. After 15-20 days of intensive breeding, red crabs can be developed. Red Crab: The ovary is mature, weighs more than 250 grams, two shells are filled with red paste, body is strong, there is no transparent area observed under light, the dots above the abdomen of the abdomen have become red, and some shells have been bright red. Feeding bait for 40-50 days can be grown into a crab. Thin Crabs: female crabs that were first mated, individuals more than 250 grams, observed under strong light, both sides of the carapace from the base of the eye shank to the ninth lateral tooth with a half-moon ovary outline, which is transparent from top to bottom, this is Ovarian mature expansion range. Such crabs can become full-blooded blue crabs for 30-40 days. Crabs: female crabs that have been mated for nearly 1 month. The ovary has begun to mature and expand, but it has not yet spread to the edge of the carapace. When viewed under light, some transparent places can be seen as a half-moon curve. The dots above the abdomen of the abdomen turn from milky white to yellow. After 15-20 days of intensive breeding, red crabs can be developed. Red Crab: The ovary is mature, weighs more than 250 grams, two shells are filled with red paste, body is strong, there is no transparent area observed under light, the dots above the abdomen of the abdomen have become red, and some shells have been bright red.

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