Causes of enteritis
Enteritis is a common disease in shrimp culture, which can occur in the whole culture cycle. Generally speaking, enteritis is mainly caused by the following reasons:
1, bacterial infection.
In recent years, the outbreak of shrimp disease is mainly bacterial disease, which is generally believed to be caused by pathogenic bacteria such as Aeromonas hydrophila, Escherichia coli and Salmonella. When these pathogenic bacteria occupy a quantitative advantage in the intestinal flora, it will cause enteritis.
Therefore, before being infected by bacteria, it is necessary to establish beneficial intestinal flora in advance, compete with each other, inhibit each other and maintain a stable dynamic balance. Many farmers have confirmed that adding pepper extract to feed can make prawns' intestines healthier and less likely to get sick.
2, algal toxins
According to the first-line observation, shrimp enteritis is a high probability event after harmful algae phase appears in the pond. However, when harmful algae are dominant in the pond, they will release microcystins to the water body due to flocculation and adhesion on the feed, ingestion by shrimp or decay of harmful algae, leading to shrimp poisoning and enteritis.
Obvious symptoms
In enteritis, the digestive tract of shrimp is red, the stomach is the most obvious, the back of the intestine is also red or swollen, and the posterior cecum is turbid.
When it gets worse, the intestine will break and defecate, and the sick shrimp will have poor vitality and slow growth.
In severe cases, there is no food in the intestine, the intestinal mucosa is necrotic and exfoliated, and pus or fluid accumulates in the intestine. Intestinal toughness becomes worse, and it is easy to break, and a small amount of shrimp is eaten to death.
Reproductive problems caused by enteritis
Slow growth and weak constitution
After enteritis, the intestinal absorption capacity of feed nutrition decreased, resulting in malnutrition, difficulty in slimming and shelling, and slow growth of shrimp; After a long time, physical fitness and disease resistance will be greatly reduced, leading to loss, theft or other diseases;
Rapidly deteriorating water quality
Feed is ground in the stomach, digested by the liver and pancreas, and needs to be further digested and absorbed in the intestine. After shrimp enteritis, intestinal digestion and absorption are less, and a large number of particles and soluble protein that need further digestion are directly discharged into the water, which is difficult to collect and discharge, and the water quality deteriorates rapidly.
Key points of prevention plan
1, feed additive for slow feeding and feeding
When the weather is fine, feed it steadily and feed it with pepper extract for a long time. It was found that the pepper extract had obvious food attraction and could significantly improve the body color of prawns. Capsaicin, as an antibacterial active ingredient from natural plants, has a broad-spectrum antibacterial effect, which can effectively relieve inflammation, reduce the occurrence of enteritis and other inflammations, and promote the healthy growth of animals.
2. Less stress and more maintenance.
In the process of aquaculture, stress and injury often occur, especially in high-density aquaculture in high-level ponds. On the one hand, try to avoid pressure, such as water temperature changes, algae blooms and so on. , stabilize water quality. Use natural pepper extract to improve the anti-stress ability and immunity of aquatic animals.
In a word, the pepper extract is natural, green, safe, non-toxic, non-irritating and drug residue when used for intestinal care of Penaeus vannamei. Practice has proved that the intestine of Penaeus vannamei grows stronger, fuller, eats better and has stronger immunity after being mixed with pepper extract.
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