Autumn is another period of high incidence of "black spot" and "red spot disease" of green shrimp under artificial culture. Both shrimp and shrimp can be infected, which seriously affects the effectiveness of shrimp culture and should be strengthened.
First, black spot
Occurred in high-density culture ponds, mainly due to the deterioration of water quality and sediment quality, resulting in the large number of bacteria that decomposed chitin crust chitin, which is characterized by rapid infection, many deaths, and great harm. At the beginning of the disease, the shrimp body lesions showed smaller gray spots or brown spots, and then gradually expanded to the septum, abdomen, appendages, etc. In severe cases, the spots were depressed in the middle, with ulcerative dark spots, and direct septum and subcarapace tissue. Diseased shrimps have very poor vigor, loss of appetite, or even stopping their food. They often float on the surface of the water or linger in the waterside tussock until they die.
For high-density shrimp ponds, the following prevention measures should be taken early in the summer and early autumn:
1. Regularly add fresh water to shrimp ponds to keep the water fresh. For places with poor water exchange conditions, quicklime (25 mg/m3) or water quality improver can be applied once or twice a month to improve water quality and sediment quality;
2. The feeding of bait must be fresh and clean, and strive to regular, fixed-point, qualitative, quantitative, to avoid residual bait pollution of water quality. In the production operation, the utensils should be smooth, and the movement should be gentle to prevent bruising;
3. Properly reduce the culture density, especially for high-density culture ponds, and keep them in appropriate pools. The amount of shrimp should be controlled to be less than 80,000 per mu.
4. Observe and take immediate measures for the onset of the disease pool. Sprinkle nitrofurazone 1 mg/L or formalin 25 μg/L in whole pool. After 12 hours, change the water completely once a day, depending on the condition. ~ 3 times to control the condition;
5. For large area disease pools, while spraying in Quanchipia, 0.3% of sulfa drugs such as sulfadiazine, iodothiazole, etc. should also be added to the artificial diet of shrimps and fed for 5 days to 7 days.
Second, red dot disease
Although the disease does not occur fulminantly or in large quantities in general, its death is persistent and recurrent. At the beginning of the disease, there may be one to several red spots on the appendages, carapace and caudal peduncle of the shrimp. Afterwards, the red spots gradually increase. When the disease is severe, it causes one side of the black mole. If it is not treated, the diseased shrimp will crawl within 2 days to 4 days. Death on the shallows. Among the dead shrimps, shrimps were seen at first and shrimps appeared later. Shrimp cured after suffering from this disease, its meat quality is also very poor, it is difficult to sell a good price.
Its prevention measures are:
1. Shrimp Pond Water quality should be kept fresh in the late summer and early autumn, with a transparency of at least 40 cm or more, and there should be 1/2 area of ​​water in the pool;
2. The shrimp ponds should be treated with quicklime (25 mg/m3) or water quality improver once a month, and the density of the cultured fish should be properly reduced.
3. For the disease pool, feed 1 kg of norfloxacin per kilogram of bait and feed for 7 days without feeding any other feed.
4. From the day after the use of norfloxacin, combined with the use of 0.8 mg/L “Strong Chlorideâ€, it is best to splash it on a sunny day in the whole pool, which can effectively control the spread of the disease.
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