With the development of the aquaculture industry, the prevention and treatment of aquaculture animal diseases and the pollution-free culture of aquatic animals have attracted increasing attention. The development trend of disease prevention and control is from the prevention and control of chemical drugs, to biological agents and immune methods, to improve the immune function of cultured objects, breeding disease-resistant varieties, and adopting ecological prevention and control of diseases and other comprehensive prevention and control to make the products green. product.
Astragalus is a freshwater economic fish. Its meat is delicate, delicious, nutritious, and has medicinal health care functions. It is a delicious delicacy and nourishing health food favored by consumers at home and abroad. It is very popular in the domestic and foreign markets. Artificial breeding of Astragalus has many advantages such as less land occupation, convenient management, low cost, significant economic benefits, etc., and is increasingly favored by producers. However, with the development of its intensification, more and more rickets have become more and more. For this reason, this article will introduce the prevention and treatment of the disease caused by the yellow locust in combination with non-environmental pollution, so as to provide reference for the majority of jaundice farmers.
1 Disease prevention
To carry out non-environmental culture of Scutellaria baicalensis, the first should pay attention to its immunity or to protect its own inherent resistance to disease immunity. The physical defense factors that affect non-specific immunity of Scutellaria baicalensis include mainly scales, skin and other surface barriers, and mucus and phagocytic cells. The second line of defense. Scales, skin, and mucus are important barriers for fish to fight pathogens and parasitic organisms. Therefore, to protect the fish from damage, to avoid harm caused by the enemy, the pathogen can not be invaded, such as red skin disease, print disease and water mold disease will not occur. The high concentration of chemical substances in the aquaculture water will promote the secretion of mucus by the Astragalus membranaceus. Excessive secretion of mucilage will not protect the fish, and it cannot resist the invasion of pathogenic bacteria.
Huangqi is difficult to detect from the group at the early stage of the disease. Therefore, major economic losses can only be avoided if preventive work is done in advance. Disease prevention must go through the whole cultivation work. Here I mainly talk about the work of seed selection and ecological prevention.
1.1 Seed selection
Seed selection is a key step in the whole breeding process. The following points should be noted in the selection of seedlings for Astragalus: 1 Injury and jaundice with wounds, scars on the body surface, blood spots, swelling in the neck, etc. are often caused by improper capture. Due to improper stocking, the cage should generally be kept for breeding. 9 species with abnormal conditions should not be cultured. In the tail of purple jaundice, lack of mucus or no mucus, which is the symptoms of saprophytic infection; corpus callosum has obvious red pits, the size of such as soybeans, which is infected with the symptoms of skin diseases; yellow peony head with large neck and thin, weak physique, In severe cases, it is curled. This is a symptom of capillary nematode disease and it is highly contagious. 3 Long-term high-density collection, transportation, and post-cultivation are often caused by less mucus and higher temperature, resulting in a “fever†disease of the yellow jaundice. This type of jaundice breeding process often dies in succession and is difficult to cure. 4 Astragalus that is poisoned by drugs, for example, is poisoned by pesticides. The appearance is still difficult to identify, but it is usually about 30 hours (depending on the temperature) and the body color is gray and the belly is upward. It should not be cultured. 5 In the deeper water, piling astragalus tends to be worse than that of astragalus, which is lying quietly in the bottom of the water. It is relatively easy to die and should not be cultured.
1.2 Ecological Disease Prevention
Prevention of rickets should be based on ecological prevention. The main measures for ecological prevention include maintaining a good space environment, rational construction of farms, and satisfying the requirements of the ecological habits of the yellow peony. 2 Strengthen the management of water quality and water temperature, maintain good water quality and bottom quality, avoid changing the water temperature too much, and prevent the water temperature from being too high. 3 Plant emergent plants or floating plants such as Eichhornia crassipes and Alternanthera philoxeroides in the farm, and plant some climbing plants by the pool. 4 Put a small amount of loach in the pond to activate the water body, put a few quails per pool, and use their secretions to prevent rickets. 5 Application of beneficial microbial preparations to improve water quality Maintain microbial balance and inhibit the proliferation of harmful microorganisms. 6 sickness should be isolated in time.
In addition, in the cultivation of pollution-free radix scutellariae, in order to maintain the ecological balance in the breeding environment and the in-vivo and in-breeding objects, and to suppress or eliminate the invasion and infection of predator organisms, in addition to using beneficial microbial preparations as far as possible, conducting biological control and creating a good ecological environment, It is also necessary to use disinfection and antibacterial drugs in a proper and reasonable manner. However, care must be taken in the use of these drugs, their dosages, and when they are used. For example, they must not use banned drugs, must not be used in excess, and must be banned from use. Period and drug withdrawal period. If it is used excessively, it will not only fail to prevent and treat diseases, but it will also cause death from drug injury. This kind of death sometimes occurs in a large number in the short term, and sometimes it occurs continuously in the breeding process and the loss is quite serious.
2 disease treatment
2.1 Red skin disease
2.1.1 Pathogen bacterial infections.
2.1.2 Symptoms Diseases caused by bacteria invading the skin due to injury to the skin of the jaundice during fishing or transportation. The body surface of the sick man has localized bleeding, inflammation, and shedding of the skin, especially in the abdomen and on both sides. Sometimes jaundice, jaw and lid are also congested and inflamed. Symptoms are often secondary to waterborne fungus infections. Sick and weak body, late spring, early summer is more popular.
2.1.3 Prevention and cure method 1 Be careful when fishing and transportation to avoid carcass injury; 2 Wash the carcass with 5~20mg/L bleach for about half an hour before restocking; 3 Use bleaching powder for prevention in the onset season. The amount of bleaching powder is generally 0.4 g/L. 4 with 1.0 ~ 1.2mg / L bleaching powder Quanchiposa, with 2 ~ 4mg / L Gallant Quanchiposa, continuous 3d; 5 per square meter with alum 0.05g spill, 2d and then quicklime by 25g / cubic meter of water sprinkling .
2.2 Intestinal disease
2.2.1 Pathogen bacterial infections.
2.2.2 Symptoms and illnesses The animals walk alone and swim slowly. The corpus callosum is dark. The head is particularly noticeable. The erythema appears in the abdomen and the appetite diminishes. Cut open bowel shows local congestion and inflammation of the intestine, there is no food in the intestine, intestinal mucus more. The disease is highly contagious, with a short course of disease and high mortality. The water temperature of 25 to 30% is the appropriate epidemic temperature of the disease.
2.2.3 Prevention and control method 1 Strengthen feeding and management, do not feed rotten degenerate feed, eliminate residual baits in time to prevent deterioration of water quality; 2 In the onset season, every 100g of baicalin should be fed with garlic 30g for feeding for 3 to 5 days; 3 The combination of internal and external use of drugs. External use of 110E-6 ~ 210E-6 bleach concentration or 1010E-6 concentration of lime or 0.210E-6 ~ 0.310E-6 erythromycin poultry shed the whole pool.
2.3 Leaf spot
2.3.1 Pathogen bacterial infections.
2.3.2 Symptoms: A large, yellow, round bean patch appeared on the back of the sickle and died when severe. The disease is still popular from June to August and peaks in mid-July.
2.3.3 Prevention and cure method 1 Use 0.4mg/L trichloric isocyanuric acid Quanchiposa; 2 skin pool with peeled pimple, with a good rope system dragged back and forth several times in the pool, there is a certain effect.
2.4 Print Disease
2.4.1 pathogenic Aeromonas versiforme subspecies.
2.4.2 Symptoms Symptoms of the affected area first appear round or oval necrosis and erosion, exposing the white dermis, congestive skin inflammation, erythema, the formation of a clear outline. The sick swims slowly and his head often stretches out of the water. The disease can be seen all year round, especially from April to September.
2.4.3 control methods 1 external use drugs with red skin disease; 2 internal medication with 100g of Astragalus with 2g sulfamonomethoxine feed, continuous 5 ~ 7d.
2.5 Hemorrhage
2.5.1 pathogen Aeromonas hydrophila.
2.5.2 Symptoms The body surface of the sickness was spotted or plaque-like diffuse hemorrhage. The most obvious was the abdomen, followed by both sides of the body. There was no ulcer on the body surface, and the body lost its elasticity and became stiff. Sick throat, mouth congestion and blood flow. The abdominal cavity has bloody water, the liver is swollen and pale, and some have blood spots. Liver and kidney bleeding are particularly serious with liver damage. Intestinal inflammation, hyperemia, no food, yellow mucus, anal swelling. The disease has a fast onset, with a mortality rate of over 90% in severe cases. The popular season is from April to October and the peak from June to September.
2.5.3 Prevention and control method 1 0.4～0.5mg/L trichloroisocyanuric acid Quanchiposa; 2 use 10mg/L chlorine dioxide to infiltrate the bath for 5 to 10 minutes, use 2.5g norfloxacin per 100kg of Astragalus Mixed feeding, continuous 5d, 1d dose doubled.
2.6 Bacterial tail disease
2.6.1 Pathogens Aeromonas sp.
2.6.2 Symptoms Infected caudal peduncles become inflamed and inflamed until muscle necrosis erodes. The sickness was unresponsive and the head often stretched out from the water. In severe cases, the tail was rotten, and the tail bone was exposed and died of inactivity.
2.6.3 Prevention and control method 1 Use 10mg/L of chlorine dioxide to dip for 5~10min; 2 For every 100kg of Huangqi, use 5g of oxytetracycline to feed 5~7d.
2.7 Shui sis
2.7.1 Pathogens Aquatic fungi.
2.7.2 Symptoms of the disease are not obvious at the initial stage of the disease. After a few days, the lesions on the surface of the diseased body will grow hyphae on cotton wool and cause muscle decay in the affected area. Both eggs and seedlings may infect these diseases. All injured eggs, juveniles and adults are susceptible to the disease.
2.7.3 Prevention and cure method 1 Lime pond in the pond is used, the amount is 100-150g per cubic meter of water, and the whole pool is spilled after the water is soaked; 2 Soak the sickle with 3%-5% of salt water for 5min; 3 Use 0.04% of salt Water and 0.04% sparkling water splashed across the pond.
2.8 Acanthosis
2.8.1 The pathogen hides the spineworm.
2.8.2 Symptoms The larvae of A. spinosus are large and milky white. They mainly parasitize on the intestinal wall of the intestine of the sick and crawl into the intestinal mucosa with hooks. They absorb parasitic nutrients and often cause intestinal wall and bowel disease. Road congestion inflammation, fish weight loss. A large number of parasites can cause intestinal blockage, severe intestinal perforation, or intestinal obstruction, emaciated body weight loss, and sometimes anemia and death. The disease can occur throughout the year, there is no obvious seasonality, all age groups can be infected with jaundice, the infection rate of 60% to 100%.
2.8.3 Prevention and control method 1 Use crystal water 0.7mg/L trichlorfon to spill, kill the middle host sword leeches, while using crystal trichlorfon by fish weight 0.1g/L bait feeding, even feed 6 ~ 7d ; 2 per 100 kg Astragalus with 0.2 ~ 0.3g levamisole or methyl imidazole and 2g garlic powder or sulfadiazine mixed feeding, feeding 3d.
2.9 Capillary nematode disease
2.9.1 pathogenic capillary nematodes, small as fibrous body, with the head drilling into the mucous membrane of the gill wall, sucking carcass nutrition, destroying the tissue, causing intestinal inflammation.
2.9.2 Symptoms Symptoms Inflammation of the intestine is caused by inflammation of the intestine, dissociation, extreme weight loss, and subsequent death. When there are a few parasitic parasites, there are no obvious symptoms. When parasites are heavily parasitized, the diseased body shows a dragon-like movement, the head trembles, and it loses weight until it dies. The disease is mainly harmful to the species of the year and a large number of parasites cause larval death.
2.9.3 Prevention and control method 1 Disinfect the fresh lime pond with 2010E-6～2510E-6 to kill the eggs and sick people; 2 Use 90% crystal trichlorfon 0.1g per kilogram of jaundice, mix the fodder feed , continuous feeding 5 ~ 6d.
2.10 Chinese neck disease
2.10.1 pathogen The Chinese neck cricket is commonly known as grasshopper.
2.10.2 Symptoms The Chinese cercaria is sucked by the sucker on any part of the body surface of the larvae and pupa. The single antler is mainly adsorbed on the pod borehole, the body side and the head and absorbs the host's blood. The mortality rate is 100%.
2.10.3 Prevention and cure method 1 Use quick lime clear pond to effectively kill crickets; 2 Use 10mg/L crystal trichlorfon or 5mg/l potassium permanganate solution to spill; 3 Use 3% saline solution to dip sickness 5~ 10min;
2.11 Fever
2.11.1 Symptoms This disease is mainly due to excessive stocking densities. Excessive secretion of mucus from the surface of Astragalus membranaceus results in accelerated decomposition of microorganisms in the water, consumes dissolved oxygen in the water, and releases heat, making the Astragalus unnerved due to lack of oxygen and intertwining with each other. death.
2.11.2 Prevention and control method 1 The appropriate stocking density drug should be appropriate. Replace the summer drug with new water or plant some aquatic plants in the pool in order to reduce the water temperature and keep the water fresh; 2 Put a small amount of loach (500 to 1000 g) into the pool. Ingesting residual bait, while the muddy upside down kinetic energy to reduce salmon winding; 3 with 0.710E-6 concentration of copper sulfate solution Quanchiposa.
Astragalus is a freshwater economic fish. Its meat is delicate, delicious, nutritious, and has medicinal health care functions. It is a delicious delicacy and nourishing health food favored by consumers at home and abroad. It is very popular in the domestic and foreign markets. Artificial breeding of Astragalus has many advantages such as less land occupation, convenient management, low cost, significant economic benefits, etc., and is increasingly favored by producers. However, with the development of its intensification, more and more rickets have become more and more. For this reason, this article will introduce the prevention and treatment of the disease caused by the yellow locust in combination with non-environmental pollution, so as to provide reference for the majority of jaundice farmers.
1 Disease prevention
To carry out non-environmental culture of Scutellaria baicalensis, the first should pay attention to its immunity or to protect its own inherent resistance to disease immunity. The physical defense factors that affect non-specific immunity of Scutellaria baicalensis include mainly scales, skin and other surface barriers, and mucus and phagocytic cells. The second line of defense. Scales, skin, and mucus are important barriers for fish to fight pathogens and parasitic organisms. Therefore, to protect the fish from damage, to avoid harm caused by the enemy, the pathogen can not be invaded, such as red skin disease, print disease and water mold disease will not occur. The high concentration of chemical substances in the aquaculture water will promote the secretion of mucus by the Astragalus membranaceus. Excessive secretion of mucilage will not protect the fish, and it cannot resist the invasion of pathogenic bacteria.
Huangqi is difficult to detect from the group at the early stage of the disease. Therefore, major economic losses can only be avoided if preventive work is done in advance. Disease prevention must go through the whole cultivation work. Here I mainly talk about the work of seed selection and ecological prevention.
1.1 Seed selection
Seed selection is a key step in the whole breeding process. The following points should be noted in the selection of seedlings for Astragalus: 1 Injury and jaundice with wounds, scars on the body surface, blood spots, swelling in the neck, etc. are often caused by improper capture. Due to improper stocking, the cage should generally be kept for breeding. 9 species with abnormal conditions should not be cultured. In the tail of purple jaundice, lack of mucus or no mucus, which is the symptoms of saprophytic infection; corpus callosum has obvious red pits, the size of such as soybeans, which is infected with the symptoms of skin diseases; yellow peony head with large neck and thin, weak physique, In severe cases, it is curled. This is a symptom of capillary nematode disease and it is highly contagious. 3 Long-term high-density collection, transportation, and post-cultivation are often caused by less mucus and higher temperature, resulting in a “fever†disease of the yellow jaundice. This type of jaundice breeding process often dies in succession and is difficult to cure. 4 Astragalus that is poisoned by drugs, for example, is poisoned by pesticides. The appearance is still difficult to identify, but it is usually about 30 hours (depending on the temperature) and the body color is gray and the belly is upward. It should not be cultured. 5 In the deeper water, piling astragalus tends to be worse than that of astragalus, which is lying quietly in the bottom of the water. It is relatively easy to die and should not be cultured.
1.2 Ecological Disease Prevention
Prevention of rickets should be based on ecological prevention. The main measures for ecological prevention include maintaining a good space environment, rational construction of farms, and satisfying the requirements of the ecological habits of the yellow peony. 2 Strengthen the management of water quality and water temperature, maintain good water quality and bottom quality, avoid changing the water temperature too much, and prevent the water temperature from being too high. 3 Plant emergent plants or floating plants such as Eichhornia crassipes and Alternanthera philoxeroides in the farm, and plant some climbing plants by the pool. 4 Put a small amount of loach in the pond to activate the water body, put a few quails per pool, and use their secretions to prevent rickets. 5 Application of beneficial microbial preparations to improve water quality Maintain microbial balance and inhibit the proliferation of harmful microorganisms. 6 sickness should be isolated in time.
In addition, in the cultivation of pollution-free radix scutellariae, in order to maintain the ecological balance in the breeding environment and the in-vivo and in-breeding objects, and to suppress or eliminate the invasion and infection of predator organisms, in addition to using beneficial microbial preparations as far as possible, conducting biological control and creating a good ecological environment, It is also necessary to use disinfection and antibacterial drugs in a proper and reasonable manner. However, care must be taken in the use of these drugs, their dosages, and when they are used. For example, they must not use banned drugs, must not be used in excess, and must be banned from use. Period and drug withdrawal period. If it is used excessively, it will not only fail to prevent and treat diseases, but it will also cause death from drug injury. This kind of death sometimes occurs in a large number in the short term, and sometimes it occurs continuously in the breeding process and the loss is quite serious.
2 disease treatment
2.1 Red skin disease
2.1.1 Pathogen bacterial infections.
2.1.2 Symptoms Diseases caused by bacteria invading the skin due to injury to the skin of the jaundice during fishing or transportation. The body surface of the sick man has localized bleeding, inflammation, and shedding of the skin, especially in the abdomen and on both sides. Sometimes jaundice, jaw and lid are also congested and inflamed. Symptoms are often secondary to waterborne fungus infections. Sick and weak body, late spring, early summer is more popular.
2.1.3 Prevention and cure method 1 Be careful when fishing and transportation to avoid carcass injury; 2 Wash the carcass with 5~20mg/L bleach for about half an hour before restocking; 3 Use bleaching powder for prevention in the onset season. The amount of bleaching powder is generally 0.4 g/L. 4 with 1.0 ~ 1.2mg / L bleaching powder Quanchiposa, with 2 ~ 4mg / L Gallant Quanchiposa, continuous 3d; 5 per square meter with alum 0.05g spill, 2d and then quicklime by 25g / cubic meter of water sprinkling .
2.2 Intestinal disease
2.2.1 Pathogen bacterial infections.
2.2.2 Symptoms and illnesses The animals walk alone and swim slowly. The corpus callosum is dark. The head is particularly noticeable. The erythema appears in the abdomen and the appetite diminishes. Cut open bowel shows local congestion and inflammation of the intestine, there is no food in the intestine, intestinal mucus more. The disease is highly contagious, with a short course of disease and high mortality. The water temperature of 25 to 30% is the appropriate epidemic temperature of the disease.
2.2.3 Prevention and control method 1 Strengthen feeding and management, do not feed rotten degenerate feed, eliminate residual baits in time to prevent deterioration of water quality; 2 In the onset season, every 100g of baicalin should be fed with garlic 30g for feeding for 3 to 5 days; 3 The combination of internal and external use of drugs. External use of 110E-6 ~ 210E-6 bleach concentration or 1010E-6 concentration of lime or 0.210E-6 ~ 0.310E-6 erythromycin poultry shed the whole pool.
2.3 Leaf spot
2.3.1 Pathogen bacterial infections.
2.3.2 Symptoms: A large, yellow, round bean patch appeared on the back of the sickle and died when severe. The disease is still popular from June to August and peaks in mid-July.
2.3.3 Prevention and cure method 1 Use 0.4mg/L trichloric isocyanuric acid Quanchiposa; 2 skin pool with peeled pimple, with a good rope system dragged back and forth several times in the pool, there is a certain effect.
2.4 Print Disease
2.4.1 pathogenic Aeromonas versiforme subspecies.
2.4.2 Symptoms Symptoms of the affected area first appear round or oval necrosis and erosion, exposing the white dermis, congestive skin inflammation, erythema, the formation of a clear outline. The sick swims slowly and his head often stretches out of the water. The disease can be seen all year round, especially from April to September.
2.4.3 control methods 1 external use drugs with red skin disease; 2 internal medication with 100g of Astragalus with 2g sulfamonomethoxine feed, continuous 5 ~ 7d.
2.5 Hemorrhage
2.5.1 pathogen Aeromonas hydrophila.
2.5.2 Symptoms The body surface of the sickness was spotted or plaque-like diffuse hemorrhage. The most obvious was the abdomen, followed by both sides of the body. There was no ulcer on the body surface, and the body lost its elasticity and became stiff. Sick throat, mouth congestion and blood flow. The abdominal cavity has bloody water, the liver is swollen and pale, and some have blood spots. Liver and kidney bleeding are particularly serious with liver damage. Intestinal inflammation, hyperemia, no food, yellow mucus, anal swelling. The disease has a fast onset, with a mortality rate of over 90% in severe cases. The popular season is from April to October and the peak from June to September.
2.5.3 Prevention and control method 1 0.4～0.5mg/L trichloroisocyanuric acid Quanchiposa; 2 use 10mg/L chlorine dioxide to infiltrate the bath for 5 to 10 minutes, use 2.5g norfloxacin per 100kg of Astragalus Mixed feeding, continuous 5d, 1d dose doubled.
2.6 Bacterial tail disease
2.6.1 Pathogens Aeromonas sp.
2.6.2 Symptoms Infected caudal peduncles become inflamed and inflamed until muscle necrosis erodes. The sickness was unresponsive and the head often stretched out from the water. In severe cases, the tail was rotten, and the tail bone was exposed and died of inactivity.
2.6.3 Prevention and control method 1 Use 10mg/L of chlorine dioxide to dip for 5~10min; 2 For every 100kg of Huangqi, use 5g of oxytetracycline to feed 5~7d.
2.7 Shui sis
2.7.1 Pathogens Aquatic fungi.
2.7.2 Symptoms of the disease are not obvious at the initial stage of the disease. After a few days, the lesions on the surface of the diseased body will grow hyphae on cotton wool and cause muscle decay in the affected area. Both eggs and seedlings may infect these diseases. All injured eggs, juveniles and adults are susceptible to the disease.
2.7.3 Prevention and cure method 1 Lime pond in the pond is used, the amount is 100-150g per cubic meter of water, and the whole pool is spilled after the water is soaked; 2 Soak the sickle with 3%-5% of salt water for 5min; 3 Use 0.04% of salt Water and 0.04% sparkling water splashed across the pond.
2.8 Acanthosis
2.8.1 The pathogen hides the spineworm.
2.8.2 Symptoms The larvae of A. spinosus are large and milky white. They mainly parasitize on the intestinal wall of the intestine of the sick and crawl into the intestinal mucosa with hooks. They absorb parasitic nutrients and often cause intestinal wall and bowel disease. Road congestion inflammation, fish weight loss. A large number of parasites can cause intestinal blockage, severe intestinal perforation, or intestinal obstruction, emaciated body weight loss, and sometimes anemia and death. The disease can occur throughout the year, there is no obvious seasonality, all age groups can be infected with jaundice, the infection rate of 60% to 100%.
2.8.3 Prevention and control method 1 Use crystal water 0.7mg/L trichlorfon to spill, kill the middle host sword leeches, while using crystal trichlorfon by fish weight 0.1g/L bait feeding, even feed 6 ~ 7d ; 2 per 100 kg Astragalus with 0.2 ~ 0.3g levamisole or methyl imidazole and 2g garlic powder or sulfadiazine mixed feeding, feeding 3d.
2.9 Capillary nematode disease
2.9.1 pathogenic capillary nematodes, small as fibrous body, with the head drilling into the mucous membrane of the gill wall, sucking carcass nutrition, destroying the tissue, causing intestinal inflammation.
2.9.2 Symptoms Symptoms Inflammation of the intestine is caused by inflammation of the intestine, dissociation, extreme weight loss, and subsequent death. When there are a few parasitic parasites, there are no obvious symptoms. When parasites are heavily parasitized, the diseased body shows a dragon-like movement, the head trembles, and it loses weight until it dies. The disease is mainly harmful to the species of the year and a large number of parasites cause larval death.
2.9.3 Prevention and control method 1 Disinfect the fresh lime pond with 2010E-6～2510E-6 to kill the eggs and sick people; 2 Use 90% crystal trichlorfon 0.1g per kilogram of jaundice, mix the fodder feed , continuous feeding 5 ~ 6d.
2.10 Chinese neck disease
2.10.1 pathogen The Chinese neck cricket is commonly known as grasshopper.
2.10.2 Symptoms The Chinese cercaria is sucked by the sucker on any part of the body surface of the larvae and pupa. The single antler is mainly adsorbed on the pod borehole, the body side and the head and absorbs the host's blood. The mortality rate is 100%.
2.10.3 Prevention and cure method 1 Use quick lime clear pond to effectively kill crickets; 2 Use 10mg/L crystal trichlorfon or 5mg/l potassium permanganate solution to spill; 3 Use 3% saline solution to dip sickness 5~ 10min;
2.11 Fever
2.11.1 Symptoms This disease is mainly due to excessive stocking densities. Excessive secretion of mucus from the surface of Astragalus membranaceus results in accelerated decomposition of microorganisms in the water, consumes dissolved oxygen in the water, and releases heat, making the Astragalus unnerved due to lack of oxygen and intertwining with each other. death.
2.11.2 Prevention and control method 1 The appropriate stocking density drug should be appropriate. Replace the summer drug with new water or plant some aquatic plants in the pool in order to reduce the water temperature and keep the water fresh; 2 Put a small amount of loach (500 to 1000 g) into the pool. Ingesting residual bait, while the muddy upside down kinetic energy to reduce salmon winding; 3 with 0.710E-6 concentration of copper sulfate solution Quanchiposa.
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