Causes, prevention and treatment white feces disease on shrimp

I. Causes

1. Feed preservation

The feed that is not preserved well will be contaminated with mold and produce toxins. When shrimp eat this feed, they will get the intestinal diseases.

2. Toxic algae

Toxic algae secrete enzymes that paralyze the intestinal epithelium. As a result, the intestines cannot absorb feed, causing shrimp to disease.

3. Parasite

The parasite (Gregarine) attaches to the intestinal wall, competes for nutrients, and damages the intestinal tract, creating an opportunity for other harmful bacteria to attack the shrimp gut.

4. Vibiro

Bacteria that cause white feces disease are mainly vibrio strains.

5. Environmental factors

Environmental and weather factors affect shrimp health, especially the liver. They reduce the ability to secrete digestive juices, which shrimp is weak the intestinal tract and excrete live feces.

II. Incubation period

The disease usually appears when shrimp at 30 days old or more. And it reaches a peak at 40-45 days.

III. Symptoms

1. Shrimp reduce or stop eating if they are serious illnesses.
2. Feces shrimp is white, float to the pond surface, and is abundant at the windward end of the pond.
3. When observing the shrimp intestinal tract, you will see that the intestines are empty (no feed) or feed breaks. In addition, it may be swell or is milky.
4. Examination by the histological method of shrimp samples with white feces disease, we will see that the liver is also damaged. The liver cells die, each patch peels off.
5. Shrimp bodies have a lack of shell or softshell.

IV. Prevention

1. For feed

Choosing specialized feed for shrimp with quality and full of nutrients. Shrimp feed should be the right size for each farming stage. The amount of feed should be appropriate and not redundant. Feed preservation well to avoid mold and toxins.

2. For the farming environment

Stocking density is appropriate to investment conditions and farming techniques. In particular, it is necessary to renovate and prepare the pond carefully according to the correct procedure before stocking. Industrial ponds should have full equipment such as paddle wheels and bottom oxygen aerators.

Periodically changing water to prevent the growth of toxic algae, avoiding shrimp to eat harmful algae that lead to disease. At the same time, sterilizing the pond water environment when shrimp have signs such as wear tail, short antennae, or swollen gills. In addition, it needs to sterilize when test results of bacteria density in water above 1000 CFU.

3. For shrimp health management

Supplementing tonics and enhancing liver function with products absorbed through the gills with ingredients such as beta-glucan, sorbitol, lysine, and methionine after three days of stocking. Periodically supplementing seven days per time. Periodically using probiotics to treat waste and clean the pond bottom seven days per time. For farmed shrimp older than ten days old (it can calculate from the beginning of using one millimeter-sized pellet), you can prevent infection of the harmful bacteria to hepatopancreas and intestine of shrimp by mixing in the feed according to the following procedure:

Morning: digestive enzymes

Afternoon: minerals and multivitamins

Evening: betaglucan antagonist, sorbitol, Glucomannoprotein, etc

V. Treatment

1. For feed

Reducing the amount of feed from 50-70% depending on the level of infection at that time

2. For toxic algae

Water exchange at least 50%. Then, supplement minerals and vitamins to stress for shrimp. After that, you can use chemicals to kill toxic algae. After killing toxic algae for two days, use probiotics to decompose dead algae. At the same time, continuously supplement digestive enzymes to shrimps for at least seven days to restore beneficial microorganisms in the shrimp gut quickly. Finally, creating beneficial algae back to shrimp ponds.

3. For bacteria and paratise

Using the herbs to remove parasites in the liver and intestines according to the producer’s instructions.

At the same time, supplementing probiotics with a high density of beneficial microorganisms overwhelm harmful bacteria causing white feces disease in water sources. It helps avoid pathogens re-infecting cultured shrimp.

Supplementing tonics and enhancing liver function with products absorbed through the gills with ingredients such as beta-glucan, sorbitol, lysine, and methionine. Adding them every day throughout the treatment period to recover and stimulate the liver to secrete digestive juices.

Note: It is difficult to treat the white feces disease in shrimp due to hepatopancreatic necrosis. It is necessary to evaluate the disease shrimp rate before treatment. If the percentage of shrimp with the empty and white gut is higher than 70%, it cannot treat.

The dose used for treatment can be double or more than the one used for prevention. In addition, it also depends on other factors such as weather, crop, stocking density, shrimp health.

Prevention is considered the best method in shrimp disease control. It affects the success of the shrimp farming industry.

To inhibit white feces disease, farmers should have a disease prevention process at the beginning of the crop. In the farming process, you should frequently supplement beneficial digestive enzymes for the intestinal tract. Also, adding products to improve disease resistance.

In addition, farmers regularly control the pond environment to limit the risk of disease.