Control of Taura virus Disease of cultured Penaeus vannamei

Taura virus disease is caused by Taura virus infection, also known as red body disease (usually the virus infection is red, the appendages are not red; bacterial infection is red appendages, the body is not red; the body is red, the appendages are also red may be mixed infection). The diseased shrimp does not feed, swims slowly on the water surface, the carapace becomes soft, the body color becomes red, and the stomach is empty. Microscopic examination showed the diffusion of body pigment and a large number of necrotic areas in scattered egg-like distribution in the epithelial tissue. The gills are yellow and swollen, and some head and chest armour show white spots.

Prevention and control methods:

1. Stocking healthy and high-quality seedlings: the size of the seedlings is 0.8-1.0 cm, the body is translucent, the muscles are full and strong, the swimming force against the current is strong, and the water temperature of the seedling pond is below 30 degrees.

2. Reasonable stocking density: the stocking density of semi-refined culture pond is 10 ~ 30 000, that of intensive pond is 40 ~ 80 000 per mu, and that of high-level pond (high density intensive pond) is less than 120000 per mu.

3. Culture only when the water temperature is high. If there is no greenhouse, it is better to raise the water temperature to above 25 degrees in May.

4. Maintain good water quality: the daily variation range of salinity is less than 0.5%, the daily variation range of pH value (7.8-8.6) is less than 0.5, dissolved oxygen is above 4 mg per liter, ammonia nitrogen is below 0.02 mg per liter, nitrite is below 0.01 mg per liter, and the transparency of water body is 40-60 cm.

5. Drug prevention and control: on the first day, 133 grams per mu of quaternary ammonium salt was sprinkled in the whole pool, on the second day, 133 grams of quaternary ammonium salt per mu was used in the whole pool, and on the third day, 200 grams of dibromohydantoin per mu was sprinkled in the whole pool. On the sixth day, the whole pool was sprinkled with 200g Bacillus subtilis and 13340 g zeolite powder per mu of water depth. At the same time, every kilogram of feed added 2 grams of immune polysaccharides, 15 grams of Red body Xiao, 10 grams of fish oil, 2 grams of vitamin C, feeding bait twice every morning and evening for 6 days.