The recent heavy rainfall in the Guangdong region has impacted the South American shrimp culture. In the cold air weather some time ago, the temperature changed rapidly, and the rainy weather continued for a long time, resulting in the increase of harmful substances in the water and the death of algae, which caused a large area of ​​shrimp ponds to undergo stress response. Most of the first-stage shrimp seedlings in most areas were affected. The loss is not small. In the case where production has not been fully resumed, the recent heavy rains will undoubtedly pose a threat to the culture of P. vannamei. Therefore farmers are reminded to do the following work.
1. Try to cultivate the diversity of aquatic organisms in the pond as much as possible to maintain a certain degree of body fat. In order to maintain a relatively stable pool water quality during heavy rain, reduce the stress response of shrimp. The algae phase of water bodies can be regulated by alternately sprinkling beneficial microorganisms such as EM bacteria, photosynthetic bacteria, and chemical heterotrophic bacteria, and the amount of algae can be fully injected according to the instructions. Usually, it is applied once every 10-15 days. If the water quality is bad, the amount should be increased. .
2. When heavy rain occurs, add enough vitamin C to feed to increase shrimp resistance. In heavy rain, shrimp consumes a large amount of vitamin C. We must add 2 to 3 inches of vitamin C to the diet, and then spray vegetable oil (soybean oil, peanut oil, rapeseed oil, etc.) or cod liver oil for aquatic products in the proportion of about 1 part of the feed. The effect is good.
3, 1-2 days after the storm is prone to storm, therefore, in the management of aquaculture to strengthen the pool, at any time to analyze the abnormal situation, check; changes in water quality, the death of individual shrimp should be carefully observed, The reason for this is to find a solution to the problem. There are more abnormal death of shrimp, first check the water quality, with or without ammonia nitrogen, nitrite and other high. The aquaculture ponds with a large number of dead plankton should pay special attention and do preventive work in advance.
4, after heavy rain, pay attention to oxygen and water transfer. After the rain, the amount of dissolved oxygen in the shrimp pond water was significantly reduced, some of the upper water was discharged as soon as possible, and the aerator was continuously turned on to maintain the normal growth of the shrimp and the ecological balance of the water body. At the same time to adjust the water quality to avoid a substantial drop in pH, can be used zeolite powder spill, the amount of 10-20 grams per cubic meter of water, in addition to each pond can also put 2 kg of glucose and 200 grams of vitamin C, or splash lime water per acre 5 About kilograms to prevent the pH of the pool water from falling drastically.
In addition, due to changes in water quality after a heavy rain, many prawns of prawns, food intake decreased sharply, at this time should be appropriately less feed. When the weather is gradually stable, water quality will be adjusted and normal feeding will resume.
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