Recently, I learned a very sad thing from the on-site technical teacher of the Ministry of Animal Protection and Fisheries, that the South American white shrimp that had been raised had all died within three days, and the farmers cried without tears. After testing, the shrimp farmer farmed by the farmer was infected with acute hepatic and pancreatic necrosis caused by Vibrio parahaemolyticus.
So how should we avoid sudden large-scale death caused by vibrio outbreaks in the breeding process, and talk to you about this topic today.
Widespread death caused by Vibrio
01：
1. Vibrio adapts to temperature: 10-35 °C, the most suitable for about 25 °C.
2, growth requires salinity: generally at 0.5-6%, the most appropriate 1%, Vibrio algae can grow at 7-10% salinity.
It can be seen that Vibrio is abundant in brackish water and seawater, but less in fresh water. This is the main reason why the incidence of vibriosis is low and the success rate of culture is high in freshwater culture of shrimp. The rate of reproduction of Vibrio accelerates with the increase of salinity and temperature, and it is shown that one Vibrio division and reproduction generation (into 2 Vibrio) also takes only 10 minutes.
02：
Enters the body mainly through surface trauma and gills. Shrimp in 2-4 cm when the phenomenon of climbing sand (high pond appears in the shallow water cluster), mostly foraging activities, shrimp fry eat microorganisms in the sand, at this time it is very easy to eat a large number of Vibrio bacteria at the bottom of the pool, if you catch up with the water body, weather changes, shrimp fry physique decline, it is easy to "dart". The thick algal membrane on the membrane of the high pool is also slowly ingested by the shrimp at this time, and the membrane also contains a large number of Vibrio bacteria, and the shrimp are also susceptible to infection.
Vibrio parahaemolyticus causes acute hepatic-pancreatic necrosis in shrimp
Vibrio parahaemolyticus colonies appear green on the culture medium, and in shrimp farming, the body color of diseased shrimp is white and reddish, most liver and pancreas are enlarged, the texture is soft, the color is light or yellowish, and the liver and pancreas of some diseased shrimp are significantly atrophied.
During the onset of shrimp disease, usually in the pond water in the slow flow or crouching on the slope of the pond, loss of appetite, jejunum and empty stomach, the disease develops very rapidly, mortality and drainage rate is extremely high, from the incidence of a small number to the pond drainage, the shortest time is only 2 to 3 days.
Overcoming Vibrio vibrio – Vibrio vermiculo
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Vibrio vermiculo, Vibrio vermicularis can quickly and accurately identify Vibrio vibrio, and take the non-flagella end as the guide, rapid rotation after contact with Vibrio, through the Vibrio cell wall into the pericoplasmic space, and then expand into a spherical leech arc, which can complete the reproduction and rupture of the Vibrio cell body in a short period of time, and the Vibrio neonatal Leeches released into the water enter the next cycle of lysis of Vibrio. Vibrio vermiculites can be used 24/7 and is not affected by environmental factors such as weather, dissolved oxygen, organic matter, water quality and pH. It does not have an impact on beneficial bacteria, algae, plankton, and farmed aquatic animals in the water body. It has significant effects on white stool, pooping, enteritis, liver and pancreatic lesions, red whiskers, red tail, red legs, slow movement, and slowing down of feeding caused by Vibrio.
1, stable disinfection, the use of 50% potassium persulfate can quickly kill bacteria including Vibrio bacteria in the pond.
2, diligently change the bottom, Vibrio likes to grow in the bottom of the pond organic matter in the environment, the pond bottom of the bait feces are Vibrio like to attach to the growth of the place, often change the bottom can oxidize the bottom organic matter, destroy the environment for the growth of Vibrio.
3, more oxygen, Vibrio is anaerobic bacteria, that is to say, the dirtier the water quality, the less dissolved oxygen in the pond, the more Vibrio. Adequate oxygen content at the bottom of the pond can inhibit the growth of Vibrio.
Vibrio vermiculo, once the liver and pancreatic lesions have occurred, white stools, it is difficult to reverse, aquaculture is mainly to prevent.