The aquaculture environment encompasses the atmospheric conditions, the water in which fish grow, and the overall water quality of the fishery. To ensure the safety and quality of aquatic products, this environment must meet specific national standards, such as "Environmental Requirements for Production Environment of Agricultural Products for Safety and Quality of Harmless Aquatic Products" (GB/T 18407-2001), "Fisheries Water Quality Standard" (GB/T 11607-89), and "Water Quality of Non-polluted Food Freshwater Aquaculture" (NY5051-2001). These guidelines help maintain a clean and healthy habitat for farmed fish.
1. **Selecting Suitable Aquaculture Water**
When choosing water for herring farming, it's essential to select areas with a pristine ecological environment, sufficient water supply, and no direct contamination from industrial waste, agricultural runoff, urban sewage, or medical waste. The surrounding area should also be free from potential pollution sources that could affect the water quality. It is crucial to avoid locations where upstream waters are polluted, as this can negatively impact the entire aquaculture system.
2. **Pond Cleaning**
Sediment buildup in ponds consists of organic matter such as fish remains, leftover feed, feces, and other debris. While some decomposition helps provide nutrients for aquatic life, excessive sediment can lead to harmful substances like hydrogen sulfide, methane, and organic acids. These compounds can accumulate in the water, harming the health and growth of herring. To prevent this, it's recommended to drain the pond and remove excess silt every one or two years, keeping the sediment layer at around 20 cm. Exposing the pond bottom to sunlight and freezing can also help eliminate pests, parasites, and harmful bacteria.
3. **Pond Disinfection**
To improve the pond environment and prevent diseases, regular disinfection is necessary. Common disinfectants include:
- Quicklime at 200–250 mg/L or lime water at 20–25 mg/L.
- Bleaching powder at 20 mg/L or 1.0–1.5 mg/L.
- Sodium dichloroisocyanurate at 0.3–0.6 mg/L or trichloroisocyanuric acid at 0.2–0.5 mg/L.
These treatments help eliminate pathogens and create a safer environment for fish.
4. **Water Quality Management**
The water quality directly affects the survival and growth of herring in the pond. Effective management ensures that the water supports a healthy ecosystem. Maintaining optimal conditions includes keeping the water clear (25–40 cm transparency), ensuring dissolved oxygen levels exceed 4 mg/L, and maintaining a pH between 7 and 8.5. The water should be rich in plankton, organic matter, and nutrients, meeting the “fat, live, tender, cool†standard for high-quality aquaculture. Proper water management acts as a critical link in achieving pollution-free fish farming.
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Introduce and promote China pharmaceutical companies` APIs and intermediates to oversea market. Introduce and promote oversea pharmaceutical companies` API and intermediates to China market.
VOLSEN is capable and authorised to handle the import and export of pharmaceutical products globally - yet our expertise lies in importing from Korea
We import and export Functional Medicinal Products from Korea, working closely with our counterparts to ensure timely release from customs.
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