The scientific use of drugs can not only effectively control crab diseases, but also many drugs can regulate crab metabolism, promote growth, improve digestion and absorption, coordinate internal mechanisms, and increase bait and fertilizer effects. The trend of drug selection today is toward the development of “three-effects†(high-efficiency, fast-acting, long-lasting) and “three small†(small dose, low toxicity, and small side effects). However, in recent years, many crab farmers have neglected some of the details in the process of administering crabs and caused unnecessary losses. The following combination of years of practice by oneself and others will introduce the "Ten View" of Crab Disease Medications for reference.
First, look at the season. From April to September, it is the peak season for the growth of crabs, and it is also the season for the spread of crab disease. On the one hand, we must find ways to increase the growth rate of crabs. On the other hand, we must also do a good job of preventing and treating diseases and improve the survival rate. Therefore, from April to September, monthly medications are required to prevent 1~2 times.
Second, look at the time. The medication should be taken on sunny days from 9:00 to 10:00 or from 16:00 to 17:00 to avoid direct sunlight at noon. However, it is best to use drugs at noon from 12:00 to 13:00 (excluding aerobic drugs).
Third, see the cause. According to the cyclical occurrence of crab disease to help analyze and determine the cause, the right medicine. If medication is used at random, the treatment time will be delayed and the water pollution will be aggravated.
Fourth, see the condition. Less severe or preventive medication, the lower limit of the available dose; heavier condition or treatment medication, use the upper limit of the dose and increase the amount. Severe diseased crabs often have lost their ability to feed, so oral methods are difficult to treat, and externally-based treatments are required. When several types of crab disease occur concurrently, drugs should be used for one of the more serious ones. Fifth, look at the timing. Crabs usually do not use drugs during the peak of the clams, especially the drugs that have a greater impact on the crabs, such as copper sulfate and trichlorfon. Even if the water temperature reaches 28 or above, they cannot be disinfected with the triclosan drugs, otherwise it is easy. Caused a large number of crab deaths.
Six, see the water quality. The effect of drugs to kill pathogens is often affected by various factors in the water. In general, the more organic matter in the water, the lower the water temperature, the higher the pH value, the smaller the drug toxicity, and the greater the safety concentration. Conversely, the less organic fertilizer, the higher the water temperature and the lower the pH, the greater the toxicity of the drug and the smaller the safe concentration.
Seven, see drugs. Crab drugs are widely sourced and can be divided into natural and synthetic medicines. The former include plant-based garlic, rhubarb, etc.; anti-microbial drugs such as oxytetracycline, etc.; disinfection drugs include iodine and chlorine. The latter has synthetic sulphonamides, potassium permanganate, bleaching powder, trichlorfon, and chlorine dioxide. To understand the performance of drugs, quality should be guaranteed. For example, the bleaching powder is easily decomposed by moisture, and the chlorine content of the bleaching powder must be measured before use. Expired penicillin drug efficacy reduced or even failed. Do not exceed 60 in water temperature when copper sulphate dissolves. Ferrous sulphate should be transparent pale green crystals, deliquescent yellowish brown iron sulfate, lost its medicinal value. A small number of farmers will use the expired drugs to double their use. For the purpose of treatment, they do not know that the active ingredients of expired crab drugs have been decomposed, and toxic substances have increased significantly, often resulting in the death of a large number of crab seedlings and crabs.
Eight, see the amount. The use of drugs for the prevention and control of crab disease is too small to play the role of eliminating pathogens; excessive use may cause death from crab poisoning. Therefore, we must strictly control the amount of drugs, mixed with water, the water agent or powder according to the volume of the entire body of water, the drug is dissolved in a small amount of water, so that it is dissolved uniformly after adding the pool water dilution, Quanchiposa. Mixed baits were administered, and the drugs were evenly mixed into the bait or pelleted and fed. Mixed administration should pay attention to: First, the drug should be mixed evenly, in practice, first take the same amount of drug and bait for equal volume mixing, mixing and then use the mixed amount of the same bait for the second mix, so many times, until After all the bait is mixed, the dose distribution is evenly distributed. The second is the rational use of additives in food baits. For long-term application of sulfa drugs, vitamin B1 and K should be supplemented.
Nine, see usage. The sprinkling method should be carried out from the windward position gradually to the downwind position in order to make the night concentration of the Chinese medicine in the pond even and prevent accidental poisoning. Spilled drugs can not be fed feed, it is best to feed, so as not to affect crab feeding. In the absence of oxygen or when the lack of oxygen is over, crabs should not be splashed with drugs (except oxygenating agents). Otherwise, a large number of crabs will die. The method of oral administration should be based on the habits of crabs, and the use of sticky buoyant baits or heavy bait-mixed drugs should be used to prevent crab disease. Dipping method, such as the liquid to be used more than once, should add some drugs after each dip as appropriate to ensure the effective concentration, the dip after the liquid can not be poured into the pond.
Ten, see the effect. Within 24 hours after treatment, attention should be paid to the dynamics of the crabs at any time. If abnormalities are found, new water should be immediately rescued. If the number of dead crabs remains within the 4 to 6 days or even exceeds the level before treatment, no curative effect is observed. To analyze the causes, continue treatment.
First, look at the season. From April to September, it is the peak season for the growth of crabs, and it is also the season for the spread of crab disease. On the one hand, we must find ways to increase the growth rate of crabs. On the other hand, we must also do a good job of preventing and treating diseases and improve the survival rate. Therefore, from April to September, monthly medications are required to prevent 1~2 times.
Second, look at the time. The medication should be taken on sunny days from 9:00 to 10:00 or from 16:00 to 17:00 to avoid direct sunlight at noon. However, it is best to use drugs at noon from 12:00 to 13:00 (excluding aerobic drugs).
Third, see the cause. According to the cyclical occurrence of crab disease to help analyze and determine the cause, the right medicine. If medication is used at random, the treatment time will be delayed and the water pollution will be aggravated.
Fourth, see the condition. Less severe or preventive medication, the lower limit of the available dose; heavier condition or treatment medication, use the upper limit of the dose and increase the amount. Severe diseased crabs often have lost their ability to feed, so oral methods are difficult to treat, and externally-based treatments are required. When several types of crab disease occur concurrently, drugs should be used for one of the more serious ones. Fifth, look at the timing. Crabs usually do not use drugs during the peak of the clams, especially the drugs that have a greater impact on the crabs, such as copper sulfate and trichlorfon. Even if the water temperature reaches 28 or above, they cannot be disinfected with the triclosan drugs, otherwise it is easy. Caused a large number of crab deaths.
Six, see the water quality. The effect of drugs to kill pathogens is often affected by various factors in the water. In general, the more organic matter in the water, the lower the water temperature, the higher the pH value, the smaller the drug toxicity, and the greater the safety concentration. Conversely, the less organic fertilizer, the higher the water temperature and the lower the pH, the greater the toxicity of the drug and the smaller the safe concentration.
Seven, see drugs. Crab drugs are widely sourced and can be divided into natural and synthetic medicines. The former include plant-based garlic, rhubarb, etc.; anti-microbial drugs such as oxytetracycline, etc.; disinfection drugs include iodine and chlorine. The latter has synthetic sulphonamides, potassium permanganate, bleaching powder, trichlorfon, and chlorine dioxide. To understand the performance of drugs, quality should be guaranteed. For example, the bleaching powder is easily decomposed by moisture, and the chlorine content of the bleaching powder must be measured before use. Expired penicillin drug efficacy reduced or even failed. Do not exceed 60 in water temperature when copper sulphate dissolves. Ferrous sulphate should be transparent pale green crystals, deliquescent yellowish brown iron sulfate, lost its medicinal value. A small number of farmers will use the expired drugs to double their use. For the purpose of treatment, they do not know that the active ingredients of expired crab drugs have been decomposed, and toxic substances have increased significantly, often resulting in the death of a large number of crab seedlings and crabs.
Eight, see the amount. The use of drugs for the prevention and control of crab disease is too small to play the role of eliminating pathogens; excessive use may cause death from crab poisoning. Therefore, we must strictly control the amount of drugs, mixed with water, the water agent or powder according to the volume of the entire body of water, the drug is dissolved in a small amount of water, so that it is dissolved uniformly after adding the pool water dilution, Quanchiposa. Mixed baits were administered, and the drugs were evenly mixed into the bait or pelleted and fed. Mixed administration should pay attention to: First, the drug should be mixed evenly, in practice, first take the same amount of drug and bait for equal volume mixing, mixing and then use the mixed amount of the same bait for the second mix, so many times, until After all the bait is mixed, the dose distribution is evenly distributed. The second is the rational use of additives in food baits. For long-term application of sulfa drugs, vitamin B1 and K should be supplemented.
Nine, see usage. The sprinkling method should be carried out from the windward position gradually to the downwind position in order to make the night concentration of the Chinese medicine in the pond even and prevent accidental poisoning. Spilled drugs can not be fed feed, it is best to feed, so as not to affect crab feeding. In the absence of oxygen or when the lack of oxygen is over, crabs should not be splashed with drugs (except oxygenating agents). Otherwise, a large number of crabs will die. The method of oral administration should be based on the habits of crabs, and the use of sticky buoyant baits or heavy bait-mixed drugs should be used to prevent crab disease. Dipping method, such as the liquid to be used more than once, should add some drugs after each dip as appropriate to ensure the effective concentration, the dip after the liquid can not be poured into the pond.
Ten, see the effect. Within 24 hours after treatment, attention should be paid to the dynamics of the crabs at any time. If abnormalities are found, new water should be immediately rescued. If the number of dead crabs remains within the 4 to 6 days or even exceeds the level before treatment, no curative effect is observed. To analyze the causes, continue treatment.
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