Bioantibody Biotechnology Co., Ltd. , https://www.bioantibodymedical.com
To strengthen management of whiteleg shrimp in rainy season
In the recent cold and rainy weather, temperatures fluctuated rapidly, and prolonged rainfall led to an increase in harmful substances in the water, causing algae die-off. This resulted in significant stress among shrimp in many ponds, especially affecting first-stage seedlings across most areas. The losses were considerable, and with production still recovering, the recent heavy rains have once again posed a serious threat to the culture of *Litopenaeus vannamei*. Therefore, farmers are advised to take the following measures to minimize damage.
First, it is recommended to cultivate a diverse range of aquatic organisms in the pond to help maintain shrimp body condition and support a stable water environment during heavy rain. To manage algal growth, beneficial microorganisms such as EM bacteria, photosynthetic bacteria, and chemical heterotrophic bacteria can be alternately applied. Follow the manufacturer’s instructions for dosage, and apply them every 10–15 days under normal conditions. If the water quality deteriorates, increase the frequency accordingly.
Second, during heavy rain, shrimp consume large amounts of vitamin C. To boost their immunity, add 2–3% vitamin C to the feed. Additionally, spray vegetable oil—such as soybean, peanut, or rapeseed oil—onto the feed at a ratio of about 1 part oil to 10 parts feed. This combination has proven effective in reducing stress and improving survival rates.
Third, within 1–2 days after a storm, abnormal conditions often occur. Therefore, aquaculture managers should closely monitor the pond, regularly check for any unusual signs, and observe changes in water quality and shrimp behavior. If there are signs of sudden shrimp deaths, test the water for high levels of ammonia, nitrite, or other harmful compounds. Ponds with large numbers of dead plankton require extra attention and preventive measures should be taken in advance.
Fourth, after heavy rain, dissolved oxygen levels in the pond often drop significantly. It is important to remove the upper layer of water quickly and keep aerators running continuously to maintain a healthy environment for shrimp. Adjust the water quality carefully to prevent a sharp decline in pH. You can use zeolite powder at a rate of 10–20 grams per cubic meter, or add 2 kg of glucose and 200 grams of vitamin C per pond. Alternatively, apply 5 kilograms of lime water per acre to stabilize pH levels.
In addition, after heavy rain, water quality changes can lead to reduced appetite in shrimp. At this time, it is advisable to reduce feeding slightly. Once the weather stabilizes and water quality improves, normal feeding can be resumed gradually. Taking these steps will help ensure the health and survival of shrimp in challenging conditions.