Penaeus vannamei is one of the three fine varieties of shrimp culture in the world at present, and it is also the fastest growing shrimp culture species in the coastal areas of Guangdong and Guangxi in the past two years. Penaeus vannamei has many advantages, such as fast growth rate, adaptability to changes in water environment, strong disease resistance, delicious meat, and high market price, so it is favored by many breeding companies. Penaeus vannamei is a new breeding breed in Guangdong and Guangxi. Many breeders lack understanding of the basic knowledge of its biological characteristics, breeding methods, feeding and management, and disease prevention and control, and often encounter such technical problems in aquaculture production. The relevant information, combined with Guangxi's two years of aquaculture practices, outlined the ecological habits of Penaeus vannamei and the issues that need to be addressed in the culture. I. Biological characteristics of Penaeus vannamei 1. Ecological characteristics: White penaeid shrimp has a thin carapace, a white and transparent body, and the outer edge of the tail fan is banded red, two long beards are pink, and the head thoracic armor is short. There are 8-9 teeth, the lower edge is 2 teeth, and the length of the adult shrimp is up to 23cm. 2. Living habits: (1) Water temperature The optimum growth temperature for Penaeus vannamei is 23-30°C. Stop feeding after 15°C, death will occur below 9°C, and water temperature greater than 35°C will have a greater impact on its metabolism; (2) ) The salinity adaptation range is 5-40 ‰, and the optimum range is 10-25 ‰; (3) The PH value adaptation range is 7.6-8.6. The optimum range is 8.0-8.3; (4) Dissolved Oxygen Dissolved Oxygen Requirements> 4ppm or more is good, not less than 2ppm; (5) ammonia nitrogen 0.2mg/L or less; (6) hydrogen sulfide 0.1mg/L or less; (7) transparency 30-60cm can be. 3. Shells and growth: In the early stage of cultivation, juvenile shrimps will be shelled once every 4-6 days. The prawns above the calendar age will be brightened once every two weeks. Before and after the first month and the fifteenth, the shrimps will be heavily shelled, and the growth rate will be highest in 60 days. Fast, after which the growth rate has slowed down significantly. 4. Ingestion habits: Penaeus vannamei is an omnivorous partial carnivorous animal, and its dietary protein content is not high (about 35%). It feeds during the day and at night, and less frequent meals can increase its growth rate. Second, the development of technology 1, site selection: Guangdong and Guangxi can be cultivated in most parts of the coast, to the end of the sand mud and fresh water supply at the construction of the pool as well. 2. Qingchi: Installed into the drainage net (60 mesh), use trichlorfon or cypermethrin to kill mixed shrimps and shellfish. Rinse 1-2 times with water, drain and disinfect with high-concentration chlorine preparation or iodine-containing whole oil once. The pond bottom acidic pond is treated with 50-100kg/alime of lime, and it is cultivated for many years! Day ponds are treated once with pool bottom improver, and the ponds are cleared as described above after exposure. 3, water: fresh seawater into 60-80cm, with ClO2 or iodine-containing disinfectant for disinfection, and then fertilize the water algae or seawater plant growth hormone and Other water 4-5 days to cultivate algae, cultivate the water to yellow green Or tea brown as well, PH control in 8.0-8.3. 4. Seedling rearing: The choice of seedlings should be large in size, smooth in appearance, and transparent in body. Muscles are not cloudy, agile to external stimuli, swimming is obvious directional, strong vitality, no disease, body length requirements are more than 1.0cm, the physical and chemical indicators of pond water quality should be close to the nursery water body. According to the feeding and drainage conditions of the rearing ponds and supporting facilities to determine the amount of seedlings released, the average ponds can hold 8,000-10,000 tails per mu, and the intensive breeding ponds can have 2.0-50,000 tails per mu. 5, to develop management techniques: Fangmiao within a month, the transparency of the pool water control in about 35cm, conditional ponds, fresh water can be drawn to reduce the pool water salinity. Under the gradual salinity, P. vannamei can tolerate the salinity changes of 1-2%, which has little effect on its growth. After entering the seedlings, depending on the development of planktonic plankton in the pond, the prawn material can be fed within 4-7 days, and the treated fresh fish or shellfish can also be used to feed the larvae. In the early stage of South American white shrimp rearing, the shelling is more frequent and the growth rate is faster. This period of nutrition must meet the needs of its growth. VC and shrimp can be fed with auxin and so on. The daily feed is 3-4 meals and the daytime is full day feed. Heavy 40%, dinner and night meal feeding 60%. According to the growth of shrimp to determine the amount of feeding. In the early stage of cultivation, the water quality of the pond may be changed, and a small amount of water may be added to change the water in the pool to keep the water in the pool fresh. In the middle and later periods, the amount of water and water shall be appropriately increased. The water body may be poisoned regularly by CLO2 or disinfectant containing iodine, and the water transparency of the pond is kept at 40-50cm. PH value control around 8.3, in the appropriate temperature and salinity conditions, generally develop 80-90 no accessible commodity shrimp specifications. Third, common diseases and control of white shrimp in South America In shrimp aquaculture, shrimp disease has always been the most headache for farmers. Shrimp aquaculture is a venture investment. In the cultivation of shrimp, the risks caused by diseases account for a considerable proportion of investment risks. As the South American white prawns adapt to the breeding environment and their resistance to disease invasion is stronger than other cultured shrimps, the introduction of new breeds is an inevitable trend in the development of aquatic aquaculture in our area, but as a natural organism Population, a sudden change in the environment. In the case of a change in the mode of survival, it is inevitable that the disease will be caused by the invasion of the disease. Therefore, the breeder must not take the chance to ignore the prevention of diseases. According to relevant data reports and two years of breeding practice, it is proved that the TSV is the biggest culprit in the breeding of white shrimps in South America. Its common pathological symptoms are: 0-1-5 grams of body weight, and stocking for 2-4 weeks. Shrimp is the most influential, and this type of virus is usually a highly pathogenic virus. The cumulative mortality rate can range from 5% to 95%. It often occurs during the massive shelling of shrimps. The shrimps are sub-acute to exacerbated. The body is very weak, the soft shell, the digestive tract have nothing (empty stomach, jejunum), surface pigments spread, these conditions are typical in the just after shelling or shelling, shrimps died a lot during the shelling process, only a very small amount Survivors of acute TS survived. At present, there is no effective method for suppressing this disease. It is generally believed that the disease is caused by the virus itself. According to the author's knowledge, in 1999, 200 mu of high-level pools in Guangdong's Suixi and other places and Guangxi's Hepu and other places in 400 hectares of semi-intensive intensive culture pools had caused pick-and-pull viruses, resulting in the loss of production and heavy losses. Penaeus vannamei white spot syndrome is also one of the common diseases of Penaeus vannamei. The main symptoms are: There are flower-like spots on the shell (usually plum-like spots), which are visible to the naked eye in severe cases, hepatopancreas enlargement, and microscopic examination. It can be found that cell mutations are often accompanied by active rod-shaped bacterial infections. The viability of the diseased shrimp decreases, the food intake decreases, and ciliates are easily attached to the body surface. The mortality rate of this disease is not very high and can be controlled after drug treatment. Jaundice disease, yellowing in the ankle, severe erosion, microscopic examination showing cocoon enlargement, weak caudal breathing, and inclusion of viruses, severe death can cause shrimp, this disease is generally due to heavy rain, high temperature, water quality changes Induced by the use of iodine-containing or complexed copper drugs to treat water quality, mixed with drugs can be cured after 3-5 days. To sum up, for the artificial breeding of Penaeus vannamei, as long as we understand its ecology, living habits, and create a good breeding environment, the breeding prospects are still very optimistic.
Specification:
Introduction:
This Grain Huller can hull multi grains. such as: millet ,sorghum, maize ,wheat ,barley ,oats ,soybeans , etc. The grains and husks can be separately completely by air flow.
It suitable for all kinds of grain processing factories, especially for family owned , small or medium size factories in rural areas.
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Model |
TYT-200 |
TYT-350 |
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Capacity |
80-90kg/h |
200-250kg for maize, beans etc 400-500kg/h for millet, sorghum etc |
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Grinding wheel size |
Φ190*Φ150*175mm |
Φ330*Φ280*205mm for millet Φ325*Φ275*205mmnfor wheat, barley Φ315*Φ265*205mm for maize, beans |
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Sieve hole size |
0.7*13mm for millet, wheat 1.2*13mm for maize, beans |
0.7*13mm for millet, wheat 1.2*13mm for maize, beans |
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Rubber resistance plate size |
165*40mm |
203*48.5mm |
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Shaft Speed |
2000r/min |
1450r/min |
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Power |
3kw |
7.5kw |
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Dimension |
380*340*800mm |
520*580*1000mm |
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Weight |
55kg |
135kg |
Grain Huller
Grain Huller,Grain Rice Huller,Grain Rice Maize Huller,Corn Grain Huller
SHIJIAZHUANG SYNMEC INTERNATIONAL TRADING LIMITED , http://www.seedgraincleaner.com