Spring fish fingerling "disinfection bag" method

The "bag disinfection" method for fingerlings is a newly developed and widely adopted technique by fish farmers in recent years. This approach is simple, cost-effective, and helps reduce fish diseases while maintaining a high survival rate. The process involves the following steps: 1. **Preparation**: Place the nylon bag containing the fingerlings on the edge of the pond, ensuring the bag's mouth is open. Allow the water inside the bag to settle and match the temperature of the pond. 2. **Disinfection Process**: Carefully pour the prepared disinfectant solution into the bag. Observe the fish’s activity during the treatment. Once the required time has passed, gently release the fish back into the pond. 3. **Drug Solutions and Soaking Times**: - A 3%–5% salt solution can be used for 20 minutes to prevent bacterial infections. - A 10–15 mg/L copper sulfate solution for 15–20 minutes helps control fungal infections like trichodina, gill rot, and anchor worm disease. - A 10 mg/L bleach solution for 20 minutes is effective against bacterial skin diseases and rickets. - A 20 mg/L potassium permanganate solution for 20 minutes helps manage parasitic insects and fungal infections. - A mixture of 8 mg/L copper sulfate and 10 mg/L bleach for 20 minutes prevents gill disease, red skin disease, and enteritis. - A combination of 5 mg/L bleach and 3 mg/L caustic soda for 20 minutes controls parasites and ringworm. - A 0.2 mg/L fish insecticide solution for 15–20 minutes protects against gill parasites such as anchor worms, humpback gills, and pine spores. 4. **Important Precautions**: - Always dilute the disinfectants properly before adding them to the bag. Never pour concentrated solutions directly into the bag or use metal containers when handling chemicals. - The recommended soaking times are based on a water temperature of approximately 20°C. Adjustments may be needed if the temperature differs significantly. This method not only ensures healthier fish stock but also improves overall aquaculture efficiency. It is especially useful for small-scale farmers who need an affordable and practical way to maintain fish health. By following these guidelines carefully, fish farmers can significantly reduce disease outbreaks and enhance productivity.

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