Spring fish fingerling "disinfection bag" method

The "bag disinfection" method for fingerlings is a modern technique that has gained popularity among fish farmers in recent years. This approach is simple, cost-effective, and helps reduce the occurrence of fish diseases while ensuring a high survival rate. The process involves the following steps: 1. **Preparation and Operation**: First, place the nylon bag containing the fingerlings near the edge of the pond, making sure the bag's mouth is open. Allow the water inside the bag to settle. Then, carefully pour the disinfectant solution into the bag and monitor the fish's activity. After the recommended time has passed, release the fish back into the pond. 2. **Disinfectant Solutions and Soaking Times**: - A 3% to 5% salt solution can be used for 20 minutes to help prevent bacterial infections. - A copper sulfate solution at 10–15 mg/L for 15–20 minutes is effective against trichodina, gill flukes, and hairworms. - A bleach solution at 10 mg/L for 20 minutes helps prevent bacterial skin diseases and rickets. - A potassium permanganate solution at 20 mg/L for 20 minutes is useful for controlling various parasites and fungal infections. - A mixture of 8 mg/L copper sulfate and 10 mg/L bleaching powder for 20 minutes can prevent bacterial gill disease, red skin disease, and enteritis. - A combination of 5 mg/L bleaching powder and 3 mg/L caustic soda for 20 minutes helps control parasites and fungal infections like ringworm. - A fish and insecticide solution at 0.2 mg/L for 15–20 minutes can protect against gill diseases such as anchor worm, sword tail, and pine spores. 3. **Important Precautions**: - Always dilute the disinfectant according to the recommended concentration before adding it to the bag. Never pour the solution directly from its original container or use metal containers when preparing the solution. - The recommended soaking times are based on a water temperature of around 20°C. Adjust the duration if the temperature is significantly higher or lower. - It’s essential to closely observe the fish during the process and stop immediately if any signs of distress appear. This method not only enhances fish health but also reduces the need for more complex and expensive treatments, making it an ideal choice for small-scale fish farmers looking for practical and efficient solutions.

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