Disposable Plastic Ear-Nose-Throat Examination Kit,including Ear Speculum,nasal speculum,Tongue Depressor.Widely usd in clinic and hospital for medical examination.
One Kit Contents:
1. Disposable Plastic Ear Speculum/1pcs
2. Disposable Nose Speculum/1pcs
3. Disposable Plastic Tongue Depressor /1pcs
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Ecological farming techniques for managing stocking densities involve the integration of crabs, shrimp, and fish in polyculture systems, along with the cultivation of aquatic plants and the introduction of snails. These methods are designed to create a balanced and sustainable aquatic environment that supports healthy growth while reducing environmental impact. The following six key aspects outline the core components of this system.
1. **Pond Conditions**: The pond should be between 2 to 10 mu (approximately 1.3 to 6.7 acres) with an average water depth of 1 to 2 meters. The bottom should be flat, free of excessive silt, and well-drained. The soil must meet national standards (GB15618-1995) for environmental quality to ensure safe and productive aquaculture.
2. **Water Quality Requirements**: The water source must be clean, free from industrial, agricultural, and domestic pollution. It should comply with the Ministry of Agriculture standard NY5051-2001 for freshwater aquaculture water. This ensures minimal discharge into rivers and prevents self-pollution within the pond.
3. **Anti-Escape Facilities**: To prevent escape, the pond should be enclosed with materials like aluminum sheets, thick plastic films, or calcium plates. These should be buried 20–30 cm underground and extend 50 cm above ground. Stakes or bamboo poles should be placed every 50 cm, and the corners should be rounded. A 1–2 meter high dike can also help prevent escapes. An outer layer of polyethylene mesh, 1 meter high, is recommended for easy inspection and maintenance.
4. **Pond Cleaning and Disinfection**: Before stocking, excess silt should be removed, and the pond should be exposed to sunlight for about a month. Lime (70–100 kg per acre) is applied to improve soil quality and eliminate pathogens. Sodium pentachlorophenol is not allowed as a cleaning agent. After cleaning, the water should be filtered through a 60-mesh nylon bag to prevent wild fish and eggs from entering.
5. **Aquatic Planting and Snail Stocking**: Aquatic plants such as Vallisneria, Hydrilla, Elodea, and floating peanuts should occupy about 30% of the pond area. They provide shelter for crabs, help purify water, and serve as natural feed. Snails are introduced to consume plankton and organic matter, acting as a live food source. This combination improves product quality, reduces costs, and increases overall yield.
- **Planting Methods**:
- *Vallisneria and Hydrilla*: Sow 50–150 g per mu after soaking seeds in water for 1–2 days. Spread or drill the seeds into fine mud.
- *Yile Grass*: Use asexual cutting method in March–April, at 5–10 kg per mu.
- *Water Peanuts*: Cut and place around the pond edge, maintaining a 2-meter width. Remove excess weeds during the growing season to avoid oxygen depletion.
- **Snail Stocking**: Introduce 200–300 kg of snails before April to ensure they grow alongside the crabs.
6. **Crab Holding Area**: In the early stages of crab stocking, a dedicated holding area (1/3–1/5 of the pond) is established in the deep water zone. Crabs are kept here until mid-May when the snails and plants have grown sufficiently before being released into the main pond.
**Stocking and Feeding Management**:
- **Crab Stocking**: Prefer locally bred crabs for better survival rates and disease resistance. Stocking should occur between late November to December or early February to April. Maintain a density of 500–800 crabs per mu, with sizes that are uniform and free of deformities.
- **Shrimp Stocking**: Release shrimp in mid-May. Use healthy, yellow-green shrimp of 4–6 cm size, at 3 kg per mu. Feed them with manure and soybean meal to promote growth and provide live food for crabs.
- **Fish Stocking**: Add 30–60 carp per mu to help control algae and improve water quality. Fish should be 10–20 per kilogram in size.
**Feeding Practices**:
Feed crabs with a mix of commercial feed, snails, fresh fish, and plant-based foods like wheat, soybean meal, and corn. Adjust feeding based on the growth stage: early (March–June) focuses on animal-based feeds, mid (July–August) on plant-based feeds, and late (August–November) on a combination of both. Feed 1–2 times daily, adjusting amounts based on consumption and health.
**Water Quality Management**:
Maintain clear, oxygen-rich water with a temperature between 26–30°C and transparency of 35–50 cm. Regularly add fresh water every 5–7 days, especially in summer. Keep aquatic plants at 30% coverage to regulate temperature. Use lime and biological agents like EM bacteria to improve water quality and prevent disease.
**Disease Prevention**:
Focus on ecological management, including regular disinfection, healthy stock selection, and good water quality. Use only approved, low-toxicity drugs if necessary, following guidelines from the Ministry of Agriculture. This approach minimizes the risk of disease outbreaks and ensures sustainable production.