In shrimp farming, we must implement the policy of focusing on prevention, focusing on prevention over cure, and combining prevention with cure. Preventing shrimp diseases should run through the entire process of breeding management. The pond should be thoroughly cleaned and disinfected before planting seedlings. During the breeding period, 0.3ppm to 0.4ppm strong chlorine or 1ppm to 2ppm bleach solution should be regularly sprayed to disinfect the pool water. Zeolite powder can also be regularly applied to purify the water quality and substrate. The dosage per mu is 15kg to 20kg. Feed the bait once every half month. Add vitamin C 3‰ to 5‰, allicin 2‰, and cod liver oil 3‰ to 5‰ to the bait. Feed the bait twice a day for 5 to 7 days. Using these methods to prevent disease can achieve better results. Cause: Caused by MBV baculovirus infection, which causes damage to the liver and pancreas of shrimp, causing them to turn white, shrink, or swell and rot.

Symptoms: anorexia, no peeling, slow growth, no special symptoms in appearance. One-month-old young shrimp are susceptible to infection, with a mortality rate of up to 100.

Prevention and treatment: Same as "white spot disease".

Treatment: Same as "Vitiligo".

★Pathogenic bacterial infection Causes and symptoms: Shrimp have bacterial infection symptoms such as broken whiskers, red legs, rotten eyes, fluorescence, yellow gills, and black gills.

① Prevention and treatment: Apply 500 to 800 grams/acre of "Oxygenated Water Dilution" according to the condition, and sprinkle 1ppm of "Lvwei" throughout the pond the next day to detoxify and stabilize the water quality.

② According to the ratio of 1, use "Qiangliwei" to mix the bait, and use it for three days.

③ Use "doxygen" to mix the bait at a ratio of 2, and feed the bait three times a day. After ten days of continuous use, change to 1 mixed bait, once a day in the evening until the shrimps are harvested.

④ If you use Yule (Baibanjing) mixed with bait orally, the effect will be better. Because a large number of nematodes parasitize the surface shell and gills, the shrimp body moves slowly, its vitality is reduced, and its food intake is reduced. In severe cases, it cannot shed its shell and may die after a long time. Nematodes are mostly caused by intermediate hosts such as miscellaneous fish and copepods that bring the worms or eggs into the pond. During the nursery period, they are mostly caused by artemia or algae.

Prevention and control methods: The bait must be strictly disinfected and the water quality must be well managed; formaldehyde 15×10-6-20×10-6, copper sulfate 1×10-6-2×10-6 or Potassium permanganate 3×10-6-5×10-6 all have certain effects. The sick shrimp floats on the water, swims slowly, has a reddish body color, and has slightly pink white spots on the carapace. The white spots are irregular in size and shape and are most likely to appear on the head and breast carapace of shrimp. In severe cases, the entire head and carapace will turn white. Secondly, there is no obvious change in the carapace surface at the white spots on the back and sides of the abdomen, but it just loses transparency.

Prevention method: Oral administration: florfenicol 3‰, vitamin C5‰, vitamin E5‰, yeast 5‰, brown sugar 10‰, for 5-7 days.

Notes: It is strictly forbidden to drain and irrigate water, it is strictly forbidden to disinfect and stimulate shrimp stress, and the daily feed should be halved. If it is later, the shrimps should be harvested in time to reduce losses, and attention should be paid to isolation to avoid infecting surrounding shrimp ponds. When there is long-term hypoxia or weakness or poor resistance, if the gill tissue is damaged, it is susceptible to secondary infection by bacteria, causing the gills to turn red or black. When observed under a microscope, dendritic red pigments can be seen in the gills. The silk is partially necrotic. The more severe the disease, the darker the color. The diseased shrimp have poorer vitality, but they can still eat food normally.

Prevention and treatment methods: Take 3‰ florfenicol orally and disinfect with chlorine dioxide three times, once a day. Drain the water level to 20% before disinfection, replenish water to the original water level 2-3 days after disinfection, and use microbial preparations to adjust the water quality. The carapace of the diseased shrimp becomes obviously soft, the body becomes thinner, the activity is weakened, the growth is slow, and in severe cases, it can cause death. This disease may be caused by excessive organic matter in the water, low pH value, and long-term nutritional deficiencies.

Prevention and control methods: Add new water to improve water quality, add 5kg/667m2 of lime and splash with water to increase the pH value of the water, and feed high-quality compound feed. Take active calcium and vitamin C orally to strengthen calcium supplementation, promote shedding, and enhance physical fitness. The shrimp body is blue and the carapace is thin. Individuals of this quality are particularly intolerant to being beaten during harvesting, thus reducing economic benefits. The exact cause is unknown, but it is generally believed to be a nutritional imbalance.

Treatment method: External use: Sprinkle 2-3g/m3 calcium hydrogen phosphate regularly throughout the pool.

Oral administration: vitamin E, vitamin C, yeast, brown sugar, 1 meal a day for 7 days. Diseased shrimp become emaciated, with muscles atrophied and separated from the carapace. At the beginning of the disease, white spots appear on the back of the abdomen. Later, the entire abdomen turns white, the gills and muscles become necrotic, and finally death occurs. The incidence rate is 2-3. The mortality rate of live shrimp during transportation is extremely high, even as high as 90, which greatly affects the selling price. The cause is unknown and the disease is not caused by a biological pathogen.

Treatment methods: 1. In breeding ponds, the water temperature should be prevented from being too high or suddenly changing during high temperature seasons. The water should be changed frequently to maintain a certain water level and sufficient dissolved oxygen. 2. Oral administration: 3‰ of florfenicol, 5‰ of vitamin C, 5‰ of vitamin E, 5‰ of yeast, 10‰ of brown sugar, for 5-7 consecutive days.