Thermal Insulation Covering Quilt Insulation Blanket,Farm Insulation Quilt,Heat Preservation Facilities,Winter Greenhouse Cold Insulation Quilt Changzhou Green Nets Co.,Ltd. , https://www.czglnets.com
Earthen pond closed shrimp farming mode
In an effort to prevent the outbreak of shrimp viruses, some aquaculture farms have experimented with various breeding methods, such as high-density shrimp farming, brine-to-freshwater shrimp cultivation, and industrial-scale shrimp production. However, due to the high initial investment required, many small-scale farms and individual households find it challenging to adopt these techniques. In recent years, the Sanzhonggang Aquaculture Farm in Binhai County, Jiangsu Province, has successfully implemented a closed earth pond shrimp farming model. This approach is not only cost-effective but also highly efficient, with a high survival rate that has attracted attention from neighboring farmers. Below are the key technical details of this model:
1. **Pond Conditions**
The location of the shrimp pond should be in a coastal area where the water is free from pollution caused by industrial wastewater from sugar mills, paper factories, and starch processing plants. The natural water depth should be over 60 cm, and the minimum annual salinity fluctuation should not drop below 1 inch. Freshwater can be drawn from well systems.
2. **Inlet Gate Setup**
Since the system is a closed earth pond, there is no need to bring in seawater during the later stages of farming. Therefore, only one inlet gate is required. For every 10 acres of pond, a 1-meter-wide inlet is installed with three gates inside the chamber. A filter mesh is placed in the outer tank, and the middle gate is about 20 cm wide for easy water level adjustment. The inner tank features a conical filtration net made of waterproof material.
3. **Preparation Before Stocking**
(1) Drill wells within the ponds to ensure continuous freshwater supply. A pump capable of delivering 100 cubic meters per 5 acres should be installed.
(2) After cleaning the pond, fill it with 10 cm of water and apply 80 kg of lime per acre. Once the lime is fully mixed, remove the slurry using a shovel or bamboo raft.
(3) After disinfection, drain the water, install a 60-mesh sieve and a conical mesh bag (8 meters long and 100 meters in total), and secure the bottom of the gate with cotton cloth or sacks to prevent gaps. Initially, leave a block at the lower part of the gate to avoid excessive water flow into the mesh bag. Within two to three days, fill the pond to a depth of 60–70 cm and seal the gate with clay to prevent leakage.
4. **Stocking Density**
Depending on the pond depth, the stocking density varies:
- For a water depth of 1–1.3 m, stock 8,000–10,000 tiger shrimp per acre, and 10,000–12,000 white shrimp per acre.
- For a depth of 1.4–1.8 m, stock 19,900–130,000 larvae per mu and 13,000 Penaeus vannamei seedlings per mu.
- Seedling size: Prairie shrimp 1–1.2 cm, South American white shrimp 0.8–1.2 cm.
5. **Feeding Schedule**
Feed according to the shrimp’s body length. Before reaching 6 cm, feed 3 times daily: 30% at 6:30, 50% at 18:00, and 20% at 23:30. After 6 cm, increase to 4 meals: 25% at 6:00, 15% at 10:30, 40% at 18:00, and 20% at 23:30.
6. **Water Quality Management**
After stocking, add well water every two days, increasing the water level by 5 cm each time until the desired depth is reached. During hot summer months, maintain full water levels. Two days before a storm, fill the pond to the top to allow rainwater to overflow naturally through the gate, preventing sudden drops in salinity and pH that could harm the shrimp.
7. **Disease Prevention**
Monitor changes in water color and bottom conditions. Disinfect the pond and improve sediment quality regularly. Apply 1.5 ppm of bleach every 15 days and use zeolite (20 kg/acre) or lime mud to enhance the bottom. Administer a medication course every 15 days for 3–5 days. Feed the shrimp with a mixture containing 0.3% vitamin C, 2% allicin, and a suitable amount of cod liver oil.
This model has proven effective in reducing disease risks while maintaining high productivity and cost-efficiency, making it a promising solution for small-scale shrimp farmers.