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To strengthen management of whiteleg shrimp in rainy season
In the recent cold and rainy weather, sudden temperature fluctuations and prolonged rainfall led to an increase in harmful substances in the water, causing the death of algae. This resulted in widespread stress among shrimp in many ponds, particularly affecting first-stage shrimp seedlings. The losses have been significant, and with production still not fully recovered, the recent heavy rains pose a new threat to the farming of *Litopenaeus vannamei*. To help farmers manage this situation effectively, here are some key recommendations.
First, it's important to promote biodiversity in the pond by cultivating various aquatic organisms. This helps maintain shrimp body condition and stabilizes water quality during heavy rain, reducing their stress levels. Algae growth can be controlled by alternating the use of beneficial microorganisms like EM bacteria, photosynthetic bacteria, and chemical heterotrophic bacteria. Follow the recommended dosages, and apply them every 10–15 days under normal conditions. If water quality deteriorates, increase the frequency accordingly.
Second, during heavy rains, shrimp consume large amounts of vitamin C, so it’s essential to supplement their feed. Add 2–3 grams of vitamin C per kilogram of feed, and mix in vegetable oil (such as soybean, peanut, or rapeseed oil) or cod liver oil at a ratio of about 1% of the feed. This combination enhances shrimp immunity and improves their survival rate.
Third, after a storm, monitor the pond closely for 1–2 days, as this is a high-risk period. Regularly check for any signs of abnormal behavior, changes in water quality, or individual shrimp deaths. Investigate the cause promptly to address the issue before it escalates. Pay special attention to ponds where there are many dead plankton, as these may indicate poor water conditions. Proactive measures, such as water testing for ammonia and nitrite levels, should be taken to prevent further damage.
Fourth, after heavy rains, oxygen levels in the pond often drop significantly. It's crucial to remove the upper layer of water quickly and keep aerators running continuously to maintain good water circulation and support shrimp growth. Adjust water quality to prevent a sharp decline in pH. You can add 10–20 grams of zeolite powder per cubic meter of water, along with 2 kg of glucose and 200 grams of vitamin C per pond. Alternatively, apply about 5 kilograms of lime water per acre to stabilize pH levels.
Additionally, following heavy rains, shrimp often eat less due to changes in water quality. Reduce feeding appropriately during this time. Once the weather stabilizes and water conditions improve, gradually resume normal feeding practices.
By taking these steps, farmers can better protect their shrimp and minimize the impact of unpredictable weather on their aquaculture operations.