"With 10 years in the shrimp industry, 5 years I vannamei culture in the form of industry with an area of 6 hectares, the victory more, but risks still threatening" - Mr. Nguyen Ngoc Toan (Hoa Thanh village , Ninh Hai Commune, Ninh Phuoc district, Ninh Thuan province) reveals.
2014, under the guidance of the National Agricultural Extension Center, Toan applicable models vannamei farming industry at VietGAP Rules, an area of 2 ha. After training on Rules VietGAP, he realized four important contents of VietGAP culture is food safety; disease free; environmental safety and social security.
From their knowledge, he decided Full compliance processes and not the use of antibiotics and chemicals during shrimp. He said the steps are as follows:
Step 1: Prepare the water to settling ponds (ponds lined canvas)
After carefully preparing pond (drained, washed canvas, drying, disinfection), affordable and mesh netting to prevent birds compartment crab, cuffs, fiddler ... taking water in through the thick fabric filter bag to remove the larvae , shrimp, crabs, fiddler handcuffs, trash fish, insects ... (wait for the new clean water obtained), using Ca (ClO) 2 to disinfect water, dose 2 kg / 1,000 m3 of water, paddle continuously in 1 day then use to BKC, dose 2 liters / 1,000 m3, 2 days after using limestone (CaCO3) dose of 70 kg / 1,000 m3, soluble fell pond to stabilize pH, using EDTA dosage of 5 kg / 1,000 m3 to remove heavy metals and alkaline stability.
Step 2: Deal watercolor in pond
When brought water into the pond, carried water coloring formula 4: 2: 1 (for every 4 kg molasses + 2 kg of rice drunk + 1 liter EM), incubated with 40 liters of water, time 4-5 days , after fermentation, fall into the pond to water coloring doses of 400 liter / 1000 m3, fell continuously for 3 days was up beautiful watercolor, ensure good development for shrimp.
Step 3: Select and Stocking
- Choose shrimp: shrimp Drop P15, shrimp have bright colors, all sizes, healthy, have been quarantined by professional bodies, shrimp negative about the disease: MBV, white spotted, yellow head, IMNV, Pancreatic cottage ...
- Release the right season, timing cool to drop (in the evening), density of 100 individuals / m2.
Step 4: Take care, management
- Feeding: Choosing foods with protein from 32-38%, with clear labels, reputable, feeding 4 (right quality, right quantity, right time, right place), click food size of shrimp age. On feeding 4 times (morning, noon, early afternoon, evening), especially pay attention to fan water shrimp oxygen 24/24. After the 3 day culture began using EM probiotics, dosage 1 liter / 1000 m3, periodical 5-7 days once applied (depending on water color to determine EM fertilizer, if not dense watercolor Fertilizer anymore). If water appears more algae, the water exchange (1/3 water in the pond), attention must be replaced at night, the next morning to bioproducts applied EM When the temperature is higher than 340C and lower than 240C, down 20% food. Toan said, probiotics (CPSH) is useful in the pond because CPSH decomposition of the organic material, food scraps, toxic gases ... clean pond, water color stability, inhibit behavior harmful organisms, promote beneficial microbial development, improve the health of shrimp, large shrimp so fast, less illness, greater efficiency culture is very different form.
- Care: In the breeding process, he always observed watercolor and health to handle the daily shrimp (deciding the amount of food, bioproducts, additional water ...). Regularly additional water and minerals in food for shrimp, in addition to feeding more Vitamin C, liver, fed continuously from the 20-day-old shrimp until harvest. The cost of using probiotics and supplements 10,000 VND / kg commercial shrimp.
- Environmental management of water: Every day, he proceeded to measure factors such as temperature, pH, DO, NH3, salinity, alkalinity, timely processing.
Step 5: Harvesting
Toan said, during feeding, he does not use any antibiotics, chemicals to prevent disease treatment; of 6 ha of shrimp, Toan apply VietGAP farming 2 hectares, 4 hectares not apply VietGAP. Results comparisons showed VietGAP ponds, large shrimps, beautiful color, high survival rate, not diseased, yield 15 tonnes / ha / crop; no VietGAP pond, risk more, the average yield of only 10 tonnes / ha / crop. Meanwhile shrimp VietGAP permanently higher price of 15,000 VND / kg (shrimp same size). Results harvest, with 2 ha of shrimp VietGAP, after 71 days of culture obtained 30 tonnes (54 shrimp / kg), the selling price 162,000 VND / kg, 4.86 billion revenue, profit 2.2 billion. Mr. feed 2 crops / year, profits of 4.4 billion / 2 ha / year.
To learn and apply models of shrimp VietGAP Nguyen Ngoc Toan Tran Van Nam households in Hoa Thanh village (Ninh Hai Commune, Ninh Phuoc district) has been successful with 10 ha, production this year to reach 200 tons of commercial shrimp. He said the application of livestock VietGAP helped limit the shrimp disease and high efficiency beyond expectations.
From the positive results above, Aquaculture Branch Ninh Thuan province has built model VietGAP shrimp 'and certification VietGAP for 4 on sand shrimp farms with 20 hectares. Certificate force 2 years and 3 months extension in time registration renewal.