Shrimp vibriosis occurs all year round, but is more common from May to September each year. The diseased shrimp mainly shows symptoms such as red legs, rotten tail, black gills and black body of the shrimp. Next, Pay attention to strengthening prevention. Today, the editor will introduce to you the symptoms of shrimp vibriosis. How to treat shrimp vibriosis?

Symptoms of shrimp vibriosis:

The main symptoms of shrimp vibriosis are: red legs, yellow and black gills, broken whiskers, ulcers on the forehead and tail, and slow response to the outside world. . Some shrimp bodies turn black and muscles are white and turbid. The hemolymph extracted from the diseased shrimp coagulates slowly, and the color changes from normal light blue to reddish. An autopsy revealed that the hepatopancreas was enlarged and reddened, and there was no food residue in the intestine.

1. The characteristics of vibriosis caused by it are: the shrimp eats little or no food, the stomach is empty of food, the hepatopancreas shrinks significantly, the shrimp body is not red (becomes more transparent), and the infected shrimp They rarely swim on the surface of the water and often lie on the edge of the pool. They have weak energy and tend to scrape sand and mud in earthen pools. Death usually occurs at the bottom of the pool.

2. Shrimp disease caused by Vibrio is also widespread, and shrimp seedlings can also be infected. Usually, the incidence rate is highest after the second stage of flea-like larvae. Some shrimp larvae advance to the flea-like larval stage I, and some begin to develop symptoms in the later stage of nauplii. This is related to the pollution of natural seawater and the deterioration of water quality.

3. The vitality of the sick larvae decreased significantly, they sank to the bottom of the water in the beaker, and died soon after. Most of them were acute, with only 1 to 2 days from onset to death, and they were highly contagious. Once they were found to have Diseased shrimp larvae will soon cause the disease in the whole pond; some chronic shrimp larvae will have serious dirt on their body surface, difficulty in molting, and will die soon.

How to treat shrimp vibriosis?

1. Reduce salinity

Vibrio is not easy to reproduce in large numbers in high-salt and low-salt environments. Vibrio reproduction can be inhibited by reducing salinity. Generally, when seedlings come in, , the salinity is 20, and the salinity can be reduced by 3 salinities a day to about 10, and then according to the salinity of the local water body, the salinity can be increased by 3 salinities a day until the salinity is the same as that of the breeding water.

2. Increase the amount of water change

Increasing the amount of water change can expel Vibrio in the water. After changing the water, the Vibrio can also be diluted.

3. Disinfection of water bodies

When it is found that the shrimp has hepatopancreas atrophy and redness, and blisters appear on the tail, the water body must be disinfected immediately. It is recommended that you use 50% potassium persulfate. , disinfect continuously for 2 days. After the disinfection is completed, it can be disinfected again after an interval of 24 hours.

4. Oral sterilization

Vibrio in shrimps can be killed by taking nanosilver orally with the mixture, twice a day for 5 days, and after 5 days of stopping the mixing , subsequent increased circulation can reduce the Vibrio content in shrimp.

5. Pond bottom improvement

Vibrio likes to breed on leftover bait, feces, and dead algae species at the bottom. Vibrio at the bottom of the pond is the main source of Vibrio in the water body and must be Thoroughly disinfect the bottom of the pond to cut off the source of Vibrio. You can use 20% potassium persulfate to oxidize the bottom humus and kill bacteria at the bottom of the pond for two consecutive days.