White shrimp breeding success experience analysis

In the context of many diseases of South American white prawn farming in most parts of the country, some South American white shrimp farmers in Weifang, Shandong province have adopted ecological breeding methods and obtained good income. Today, we share with you the ideas for the successful cultivation of white shrimp in Weifang, Weifang, in 2014.

Shrimp preparation before preparation

About Clear Pond

Many white shrimp farmers in South America feel that the old pond clear pond is as complete as possible, and both sludge and bacteria can be thoroughly cleaned. I think that "the clear pond should be kept at the bottom and it is easier to raise shrimp in the coming year." Due to the culture characteristics of the northern regions, after the end of the cultivation of white shrimps in South America, there will be a long period of time to allow the sunlight at the bottom of the pond. The drying ponds will be relatively thorough and will not affect the cultivation in the following year. Keeping some mud is equivalent to keeping a portion of the pond's active sediment. It will be easier to use fertilizer and water in the coming year and the water color will be easier to maintain. According to personal observation experience, in the past, the Tangkou fertilizer and water that had just been cleared last year would be more difficult, and the fertilizer and water in Laotangkou are generally easy, which has a great relationship with sediment quality.

About disinfection

In the Changyi area, lime and bleach were used in the past, mainly because of their low cost. This year's disinfection uses Novik (Povidone-iodine), which kills bacteria and algae. The disinfection is more thorough, but the cost will increase accordingly.

About detoxification

After disinfection with Novik, detoxification is generally not required. If groundwater is used, it is best to detoxify with natural detoxification of water (3 mu per bottle) to prevent heavy metals and other water quality problems.

About Feishui

In the first 3 days of fertilizer, the aerator will be opened at noon every day to increase the dissolved oxygen in the water, which is very beneficial to fertilizer and water. The day before the fertilization, the water is poured for natural water transfer (2 mu for each bag), and the aerator is turned on. The next day, the fisherman will splash the water (8 mus and 10 mus per barrel) and turn on the aerator to stir the water. It's easier.

Feeding of the breeding process

Before planting

Sprout Yibikang bacteriophages (2 mu -3 mu per bottle) and Yibexan stress (3 mu per bale) inhibit Vibrio in the water, improve the anti-stress ability of the shrimp, and ensure the vitality and survival rate.

Fangmiao

It is advisable to put the most suitable indicator of water quality, such as pH 8.0-8.5. However, in many cases, water is more difficult to adjust and control. I believe that as long as the Penaeus vannamei seedlings can survive when they test water, they do not need to strive for water quality indicators. Because Penaeus vannamei is very adaptable, as long as it survives in the water, it can adapt. In Changyi, due to the lack of drought and rain, the pH of saline-alkali lands is generally high, and they are all above 9.2. When they were released, they did not lower their pH, but they could only release their seedlings at high pH. Finally, they were also successful in breeding.

Daily management of aquaculture processes

Change the bottom

About chemical reforming and biological reforming: Chemical reforming works with chemical oxides and oxidizes organic matter at the bottom. It is effective and has a short duration. It is suitable for ponds where the sediment quality has deteriorated. Personally think that: high temperature is also the best use of chemical change, can quickly improve the bottom material, to prevent the leftover material and feces in the high temperature environment by harmful bacteria fermentation pollution pool bottom. The biological bottom reform is mainly the decomposition of organic matter by the bacillus, which plays a role of slowly changing the bottom, and has a long duration. It is suitable for the early breeding process of feeding less material, not having a large amount of leftovers and feces, and using biological bottoms at this time. Change the sustainability to keep the bottom good.

The amount of used change: depends on the breeding animals and breeding density, can not blindly explain the amount. Like shrimp farming, the density is generally higher, the amount of feed is larger, the sediment and water pollution can be faster, and the amount must be increased. Such as the end of the net deodorant type (per potassium hydrogen sulfate) per package 2 acres, poor use of the bottom 1 mu, but should pay attention to the use of time, can not be used in the molting, otherwise prone to irritation, resulting in dead shrimp. Generally recommended to use at night, one can oxidize organic matter, equivalent to indirect oxygenation; the second is that the algae will be partially settled in the evening, you can kill part of the treatment of the water too thick phenomenon. Bottom net degradable type (sporogenous degeneration) 5 acres per bag, the best at noon on sunny days.

The frequency of use of Diversion: The color of the mud at the beginning of cultivation is generally 10 days to 15 days; the latter is generally 5 to 7 days. In this year's Changyi area, according to this usage, after the shrimps were successfully farmed, the bottom sediments of the whole pool were very good, showing a yellowish color. Personally think that a small number of times less than a one-time sufficient amount, like the capture of the hills, each sent 10 soldiers in the past to be exterminated, it is better to send hundreds of one-time, one after another to win. Each time a small amount, the concentration is too low, the effect is not obvious, even if the use of multiple times is not necessarily effective. However, care must be taken to ensure that it is sufficient, not excessive. Excess can lead to other problems.

Some old farmers think that the bottom of the pool is clear and relatively clean. Can it be changed at the end? There is a case this year, an old farmer, the early shrimp cultivation is very good, the head is significantly larger than the surrounding, because the bottom of the pool is fresh, coupled with less feed, that the shrimp can eat, not bad, so There is little change at the end, and eventually the shrimp is raised to the end of the 70-year-old row of ponds. The author believes that even if it is the bottom of fresh water, you only need to feed the shrimp. The shrimp cannot be eaten in 100%, nor can it be fully digested. There will always be organic bottoms, and a series of heterotrophic bacteria (most of them harmful Bacteria) are easy to breed, and prawns will soon have problems. As we all know, shrimp is living in the bottom of the pool, and it does not control the quality of the sediment. In the environment where heterotrophic bacteria (mostly harmful bacteria) clump, how can the shrimp be without problems? What's more, the poor quality of the sediment will affect the water quality, which will eventually affect the health of the shrimp.

Water transfer

In the early stage of cultivation, attention should be paid to water transfer and water color. The water color is not so important in the middle and later stages. If the pH, nitrite, ammonia nitrogen, and other indicators of the test water are normal in the later period of culture, the shrimp feeding is also very good. There is no need to pay much attention to the water color. In the later period, due to the large amount of feed, there are a lot of exogenous organic substances such as protein added in the water, and the water color is easily affected. At this time, as long as regular beneficial bacteria are added to the water to maintain the balance of the bacteria and maintain the normal water quality, the shrimp can feed normally. The best water transfer. Green, yellow and green, etc. written common water color, is difficult to maintain. By the end of the cultivation, the ponds with unpleasant water color often have better shrimps, which is often referred to as “drinking water and raising good shrimps”. The author observed that the ponds in the later period when the water color changed from abnormal suddenly became very easy to develop.

Calcium supplement

The growth of the shrimp is accompanied by the molting of the skin. The early moltings are very frequent, and the skin is regularly moulted twice a month when it grows. When the shrimp shell is hardened, it needs to absorb calcium, which requires the addition of calcium and phosphorus. Calcium strength is generally used at 1 mu per bottle. Sometimes it feels that the effect of calcium supplementation is not obvious. At this time, it is best to supplement vitamins with viridolithia, which can promote the absorption of calcium.

Detoxification

Detoxification is very important! In particular, detoxification is most needed after bunge down. After the algae will produce algal toxins, long-term accumulation in the shrimp's hepatopancreas, and ultimately will destroy the hepatopancreas, that shrimp will not be saved! Therefore, detoxification products need to be used after each fall of the algae, such as natural detoxification of water, used per bottle of 1 acre, with glucose better. If ponds that often do not pay attention to detoxification are caught in algae, shrimp will generally develop disease and it is difficult to breed successfully.

Intestinal health care

It is recommended that long-term use of natural water Kang Chang Kang (10 ml -15 ml / kg of feed) spices, mix 1 meal a day, can be added to promote the establishment of beneficial intestinal flora, promote growth, prevent enteritis, enhance immunity. Personal observation, long-term spices shrimp, gut is significantly thicker and darker than unstirred shrimp, such shrimp digestion and absorption is good, like a natural long.

Vibrio

One of the keys to successful breeding this year in Changyi is the control of Vibrio, and it is used regularly for Yibukang bacteriophages (1 acre per bottle), usually once a week. The sufficient amount of effect is to directly suppress pathogens such as Vibrio. In other parts of the world, the incidence of shrimp is caused by bacterial diseases. The main reason may be that there is no attention to the suppression of pathogenic bacteria such as Vibrio, or the amount of shrimp is not enough.

In the later stages of cultivation, it is very important to change the water. At this time, the amount of feed is very large. It is impossible to rely on medicines to maintain the bottom. Drugs can only be reduced. At this time, if the conditions are appropriate, the bottom of the dirty water can be replaced every day, to add fresh water, both to improve water quality, but also promote shrimp feeding. Therefore, shrimp is best equipped with an oxidation tank to aerate the water for replacement.

Feeding concept throughout the farming process

Pre-culture

Feeding of Penaeus vannamei seedlings was done twice daily, 6 am and 6 pm respectively. Changyi shrimp aquaculture generally has more early water quality and maintains abundant algae in the water. Less feeding of feed can allow shrimp to eat more nutritious natural food, and can reduce the sediment pollution caused by previous feed overfeeding. The amount of feed to be fed is increased every day, and it can be increased by 10%. After about half a month of breeding, the body length of the shrimp can be increased by 2 or 3 centimeters on the loading stand.

In the middle and late breeding

At this time generally feed 4tons, there are 6tons, see personal preferences. In principle, the higher the number of feedings, the better the food intake of the shrimp and the faster the growth, but the higher the ratio, the more likely it will be to deteriorate the bottom of the pool, resulting in deterioration of the aquaculture environment and causing a series of serious problems. Observing the time of eating, everyone in Changyi had different opinions, one hour for observation and three hours for observation. With personal experience, it is advisable to eat for 2 hours. Usually after 1 hour, it indicates that the amount of feed is insufficient, the shrimp growth will be slow, and the shrimp that feeds poorly will feed. Even if some of the shrimps cause illness, they will not be reflected on the material table; Too long, the feed soaked in water for a long time, it is easy to cause the loss of nutrients and pollute the water. And prawn has gluttonous behavior. After an overeating, an anorexic phenomenon will occur, leading to material loss.

Hard Candies

Hard Candies,Toffee Candy,Scotch Candy,Nougat Candy

JINJIANG XIEXIANG TRADE CORP., LTD. , https://www.xiexiangfoodstuff.com