Statement of responsibility for a range of shrimp diseases In recent years, a series of problems have occurred in shrimp, including stealing death, enteritis, intestinal redness, slow feeding, red legs, red whiskers, etc., which are caused by the Vibrio myself, and we will be responsible for such incidents. After years of development, our Vibrio unit has developed into an important force that endangers shrimp farming. Our influence is everywhere, as long as there are dead shrimp where there are traces of us, as long as there are shrimp farming places have our shadow, as long as there is seawater there is our base. Our Vibrio always takes harm breeding as the only purpose, no breeding, no harm! Here we solemnly introduce the right-hand man who has made great contributions to us - Vibrio parahaelyticum. Vibrio parahaemolyticus grew up from saline-alkali land, is a salt-loving bacteria, suitable salinity of 0.5% to 8%, can grow under various harsh conditions such as pH 5 ~ 11, grows normally at 10 ~ 42 ° C, and its super reproductive ability can reproduce in 8 to 9 minutes. It can infect all kinds of marine fish, shrimp, crabs and so on by any means. His combined battle with Aeromonas hydrophila can cause penaeus pneumoniae. It can also give shrimp "red-legged disease", with morbidity and mortality rates of up to 90%. In its body, the blood debt is so heavy that even the shrimp fry refuses to let go, and shrimp larval bacteremia is the work of Vibrio parahaemolyticus. It excels at using a variety of attack vectors: 1) It can produce 4 kinds of hemolytic toxins, which have the effect of dissolving shrimp blood, cell lethality, intestinal toxicity and cardiotoxicity. 2) The production of urease makes the shrimp intestinal fluid accumulate to produce intestinal water, and in severe cases, there may be phenomena such as pulling white stool. 3) Invasive, can invade the intestinal epithelial cells to cause a series of lesions of intestinal epithelial cells and sub-mask tissues leading to severe enteritis. 4) His extracellular products have obvious pathogenic and lethal effects on shrimp. We hope that through this statement, we will not only express our gratitude to Vibrio parahaemolyticum, but also encourage advancement, improve cohesion and expand influence, and hope that the majority of colleagues will enthusiastically join our Vibrio community and work hard together for the cause of harmful aquaculture!
The above is a statement issued by the leader of the Terrorist organization "Arc Price Arc Wei" of the Vibrio Empire, which is a declaration of war launched to all shrimp farmers. A new round of breeding has begun, how to deal with this terrorist organization, shrimp farmers, are you ready for battle?
Several practical cases of vibrio prevention and control are for your reference.
In 2014, a large number of pond drainage phenomena occurred in Yangjiang and Maoming areas, such as Dagou Town, Yashao Town, Pinggang Town, Yangxi Shangyang Town and other areas of Yangjiang, most of which were caused by jejunum and empty stomach and liver and pancreas atrophy. After testing, most of the ponds are due to the proliferation and outbreak of Vibrio parahaemolyticum and Vibrio algalysis, which generally occur between 15 and 35 days, most of which are about 20 days, and many high ponds are because the previous mulch or shrimp fry itself is accompanied by a large number of Vibrio parahaemolyticum and Vibrio algae.
According to the investigation, this parahaemolytic Vibrio can parasitize under normal conditions for 40 to 60 days, at 35 to 50 ° C to inhibit its growth, more than 50 ° C is dead, so the South American White Shrimp farmers only underwent simple exposure and disinfection before the release of seedlings, and did not kill or completely kill Vibrio, and from April after the release of seedlings, the temperature gradually increased, it is summer, the temperature is 30 ~ 35 ° C (the temperature of Vibrio mass reproduction is 25 ~ 35 ° C), so that Vibrio grows and multiplies in large quantities, Coupled with feed and excess bait, shrimp feces, dead algae, moss and other epiphytics, shrimp ingestion directly cause diarrhea and destroy the intestine, resulting in intestinal infections, resulting in problems such as jejunal empty stomach and liver and pancreatic atrophy. Based on my experience and experience, I have summarized the following prevention and control measures:
first. Penaeus vannamei farmers should discharge and pump sewage 10 days after the release of seedlings, and if possible, they can change the water when the weather is good. Because sewage, pumping and water replacement can discharge most of the residual bait and feces and harmful substances such as dead algae, the reproduction of Vibrio is greatly reduced.
second. Feeding feed is best to "feed less and eat more meals", it is best to feed four meals a day, and each meal is controlled to eat within 1 to 1.5 hours. Because too long a period of time will lead to a large number of Vibrio attached to the feed by shrimp to eat, and the excess feed will rot for too long, resulting in vibrio multiplying.
third. About 5 days after entering the seedlings, detoxify with water purification king (2 acres / bottle), and detoxify every 3 to 5 times. Because the organic acids in the water purification king can appropriately reduce the acid reduction in the shrimp pond, it can effectively inhibit the growth of Vibrio and delay the outbreak of diseases such as jejunogas, liver and pancreas atrophy caused by Vibrio parahaemolyticus.
fourth. About fifteen days of seedlings, the pond should be tested for Vibrio, if there is Vibrio or seriously exceeded the standard, prevention and control measures: according to 2 acres with 1 pack of new bacteria + six anti-cultured algae paste (or brown sugar) 1 kg of mixed soaking water for 3 hours, treatment can be used for 2 days; during which the feeding is halved, while each kilogram of feed with new bacteria grams, Qingyuan, enzymatic polysaccharides each 10 grams mixed well and yin for half an hour after feeding, morning and evening 2 times, even feeding for 3 to 5 days.
fifth. If there is a small part of shrimp appear jejunal and atrophied, the weather is good, you can change the water and often sewage, and then stop feeding immediately, the stopping time is generally 5 to 6 days, (according to the visit, if you do not stop feeding after this phenomenon, a large number of shrimp on the second or third day will have an empty stomach, do not use 5 days, basically up to more than 60% of the shrimp jejunal and empty stomach) Prevention and control measures according to the method of the fourth point, mixing feeding, only need to mix 1 to 2 pounds of material once a day.
sixth. If the shrimp with jejuns and empty stomach has reached 40% or 50%, it is recommended that farmers do not think that the lesion is not saved, and they are in a hurry to drain the pond. In a similar situation, it is recommended to stop the feeding for more than 5 days and operate according to the above methods, which can make the shrimp get better, and then gradually feed the feed after 5 to 8 days of full recovery.
Example 1:
Qinzhou South American white shrimp farmer Lai boss: there is a 12 acres of soil pond, 50 days of shrimp, the water color is somewhat thick, and the shrimp whiskers are red, after testing, Vibrio seriously exceeded the standard, he called me to ask for a solution. Recommendation: According to 2 acres with 1 pack of new mushrooms + 1 bucket of six anti-cultivated algae paste after 3 hours of mixing, sprinkle with grain god (1 pack of 2 acres) in the evening to increase oxygenation. On the third day, he took water to test, and there were no Vibrio bacteria, and the water color became very refreshing, and the shrimp whiskers returned to normal.
Example 2:
Qinzhou South American white shrimp farmer Xu Boss: There is a 10 acres of soil pond, 40 days of shrimp, the water is turbid, the pH is 8.8 ~ 9.4, the shrimp 38 days when 35 kg / meal feed 1.5 hours to eat, and now 25 kg of feed / meal to eat in 2 hours. Her compatriots think that the pH value is too high, coupled with the muddy water caused by the shrimp not eating, so she used the em bacteria for 4 consecutive days to reduce the pH value, the result is that the shrimp not only did not add the material, but the water was more and more turbid. The day was my first visit to her shrimp pond, she reflected this situation to me, I decisively suggested that she first throw the net to see the shrimp, because this shrimp must be liver atrophy, jejunum and empty stomach, mainly to observe the ratio of good shrimp to problem shrimp. After throwing two net shrimp, there are an average of 35 shrimp in a net, and about 30% of the shrimp with liver atrophy and jejunum and jejunum and stomach account for about 30%. Recommendation: Use 6 packs of new mushrooms + 2 barrels of hexa-resistant cultured algae paste to soak in water at noon for 3 hours, and use it again every other day; the next evening according to 1.5 acres of hepatoprotective longevity, active garlic treasure, Materia Medica Dakang each pour water, while stopping the feeding for 2 days, the third day to start feeding, feed 10 kg per meal, at the same time according to 40 kg of material with new mushroom grams 1 pack + Qingyuan 1 bottle + enzymatic polysaccharide 1 pack of mixing feeding, feeding 2 meals a day, mixing for 5 days. On the third day of return visits, the throwing net found that the overall body color of the shrimp was much more beautiful, and the shrimp with liver atrophy and jejunum and empty stomach were less than 10%. On the 6th day of the return visit, Boss Xu said happily that the shrimp basically returned to normal, the feeding was accelerated, and 35 pounds / meal material could be eaten in 1.5 hours.
(Note: The small yellow dot mentioned in Example 3 is a beneficial bacterium, the rhubarb dot is Vibrio aeruginosa, and the large green dot is Vibrio aeruginosa)
Example 3:
Hainan Oriental Sense City Meng Boss: There is a 3-acre pond to put seedlings for 6 days, Vibrio is slightly high, shrimp are normal. On the first day, 2 packs of new mushrooms + six anti-cultivated algae paste were soaked in half a bucket and sprinkled; the next day the test of small yellow dots increased (possibly the bacteria in the new fungus), the rhubarb point increased, the large green dot decreased significantly, and then the new fungus was used 1 pack on the second day; the third day of the test was reduced by large and small yellow dots, and the green dots were not; on the fifth day, the rhubarb dots increased slightly, the small yellow dots increased, and the green dots were none. After the use of the new fungus, the water quality becomes clearer and the transparency increases. After Boss Meng found that using new bacteria was effective, he used it once every two days, 300 grams per mu each time, insisted on using it until 32 days after the seedlings were released, and tested Vibrio with only a small number of yellow spots. During the trial period, the water color remained stable, and the shrimp has been raised for 40 days without any symptoms.
Example 4:
GuanZong of Qiuyu Village, Ledong, Hainan: There are 12 ponds, of which 6 ponds are marked with fish fry, and the other 6 ponds (8 acres / mouth) are successively released with South American white shrimp fry during the same period. When it was raised to 30 days, 4 ponds were sick to varying degrees at the same time, and the water quality looked very good, but the detection of Vibrio exceeded the standard, one of which was more serious, and the shrimp jumping pond of this pond was found on the night of May 9, and a large number of dead shrimp appeared on May 12, and the reduction was serious. On May 14, Chen Gong, a technician of the Guan General Administration, came up to buy medicine and listened to Chen Gong say: "At present, 4 ponds are sick, and I plan to use 4 different schemes and different products to deal with it." After I asked Chen Gong about the situation, I suggested that he treat it with new bacteria and brown sugar. Chen Gong chose the most serious 8-acre pond, with a water depth of 1.6 meters, using 5 packs of new mushroom grams, one of the other 3 ponds for disinfection, and the other two used Vibrio vermiculite products from different manufacturers. On May 16, Chen Gong called to say that the shrimp began to resume eating, and on May 17, at the same time, the Vibrio bacteria in 4 ponds were measured, and it was found that the vibrio bacteria in the new mushroom Kenakoutang were the least. Chen Gong said: "With this pond of new bacteria, the reduction in the amount of Vibrio is the most obvious, and I am very much looking forward to the early listing of this product." ”
(Source of the article: Agricultural Treasure Book aquatic products edition)