1. What is the cause of white shrimp?
1, Vibrio infection
During the breeding period, due to factors such as water quality, sediment and weather deterioration, Vibrio will exceed the standard, resulting in white manure on prawns.
2. Poisoning
Such as algae (including cyanobacteria, dinoflagellate, etc.). ) toxins, sediment deterioration, long-term excessive water supply indicators, etc. If microcystins accumulate in large quantities and detoxification is not timely, it will lead to dysfunction of detoxification of shrimp liver.
3, water quality deterioration
During the culture period of Litopenaeus vannamei, if a large number of residues, feces and dead algae accumulate, the water quality and sediment will be hot, smelly and pantothenic, and the biological and chemical oxygen consumption will be large, and toxic substances such as ammonia nitrogen, nitrite and hydrogen sulfide will seriously exceed the standard, so a toxic layer will appear. If it is not eliminated in time, it will increase the burden of hepatopancreas, corrode intestinal mucosa and eventually lead to white stool.
4, feed mildew
Long-term feeding moldy feed will lead to necrosis of shrimp hepatocytes, dysfunction of detoxification and digestion of hepatopancreas, slow growth of shrimp, poor feed effect and eventually white feces.
5. Bad seed selection
The appearance of white shrimp in Penaeus vannamei may be due to the poor species and physique of the selected shrimp, or the poor species and physique of the released shrimp, and the imperfect structure and function of the hepatopancreas.
6, improper medication
In aquaculture, the abuse of antibiotics, disinfectants, pesticides and other drugs that damage the liver and pancreas can lead to different degrees of damage to the liver and pancreas of prawns, leading to liver dysfunction.
7. parasites
In the process of shrimp culture, if enterococci appear, they will multiply rapidly in the epithelial cells of hepatopancreatic tubules of shrimp, leading to degeneration of epithelial cells, and a large number of enterococci spores enter the feces, and finally white feces appear.
Second, how to solve it?
1. Disinfect the water body with Hanbaolan and Vibrio nemesis to kill bacteria in the water body, especially Vibrio;
2. Insist on oral administration of Hanbao EM freeze-dried powder+Astragalus polysaccharide or new enzyme peptide immune polysaccharide to improve the immunity of the body, and then add Hanbao Hugan liquid or Gankangtai to protect the liver and regulate the intestines. So as to effectively inhibit the growth and reproduction of harmful bacteria in the intestine, enhance the immunity of the body and reduce the incidence.
3. Stabilize water quality. If the water source is good, it is better to balance the aquaculture of green algae, that is, it is better to benefit algae and keep strong green water. Balanced high-density beneficial algae water has a positive preventive effect on white stool. If algae is insufficient, green algae source can be used to supplement the algae source of water body. If the water source is poor and eutrophic, the algae phase is unbalanced, and most of the water is harmful algae. In order to reduce the toxicity of harmful algae and shrimp, cyanobacteria nets or bacteria nets should be used to control the density of harmful algae and reduce or prevent the occurrence of white manure caused by algal toxins.