Fumin Fushan tells you why Penaeus vannamei farmers need to supplement mineral elements after heavy rain.

Fumin Fushan tells you why Penaeus vannamei farmers need to supplement mineral elements after heavy rain.

In the process of shrimp culture, weather change is a major factor affecting the success rate. If prevention is not in place, it is easy to cause huge losses. With the maturity and deepening of shrimp culture technology, some farmers will use Vc, oxygen-increasing products and immune polysaccharide products to improve the resistance of shrimp and prevent stress loss before and after heavy rain. Some farmers also realize that the rain will cause stress molting of prawns, so they should supplement calcium in time to prevent molting failure and soft shell stealing. However, most farmers do not pay enough attention to the rainy day prevention plan. The changes of calcium and magnesium in the pond after rain were measured for Minfushan, and the reason why mineral elements should be supplemented after rain was explained through the data.

Typhoon "Nibert" landed on the southeast coast of China, causing damage to Putian area in Quanzhou. Although it didn't have a great impact on Fuqing Jiang Jing area, the heavy precipitation brought by the typhoon brought some troubles to the shrimp pond.

The precipitation started at No.8 foundation pond and basically stopped at No.0/kloc, and the water level rose by 20cm. The concentration of calcium and magnesium in 1 #, 3 #, 5 # and 7 # foundation ponds were randomly selected for determination, and the obtained data are as follows.

The initial concentrations of calcium and magnesium in the four selected ponds are different, which accords with the diversity of pond system. However, after the rain, except for the 5# pond, the calcium ion in 1#, 3# and 7# ponds decreased by about 60ppm, and the magnesium ion in all four ponds decreased by 50ppm.

Because the calcium and magnesium concentration of rainwater itself is lower than 10ppm, it will dilute the calcium and magnesium in the pond after entering the pond. In addition, shrimps are often shelled under pressure after rain, which will lead to a significant decrease in the concentration of calcium and magnesium in the pond. However, farmers may not pay much attention to the changes of calcium, magnesium and hardness in the pond because of problems such as testing equipment and time arrangement, but these indicators often affect the success rate and aquaculture yield of the whole shrimp, which has very important evaluation significance.

Insufficient calcium, magnesium and hardness in the pond will cause the following problems:

1. Inverted algae and bacteria in the pond, destabilization system, secondary algae poisoning, anoxia, etc.

2. Shrimp can't be shelled, and the hard shell is difficult. The immune defense line is destroyed, and it is easy to be infected by Vibrio, or even die directly.

3. After the weather is fine, the shrimp has poor vitality, many pigment spots on its body and slow feeding.

4. The lack of calcium and magnesium in the pond makes shrimp more susceptible to heavy metal poisoning, and the corresponding regulatory enzymes of bacteria and shrimp are abnormally constructed.

5. The pond buffer system is destroyed, and the pH will be unstable after the weather improves.

The traditional hardness supplement of customers mainly depends on quicklime, but the mineral elements in lime are limited, mainly calcium, which has poor solubility, so it is really rarely used, and the pH of the pond soars after use, which is undoubtedly worse for some shrimps with poor conditions. The operation steps are complicated, which brings great difficulties to the operation.

So, how to supplement calcium, magnesium and hardness after a rainstorm? Before the rainstorm, mineral elements, mainly calcium and magnesium, should be supplemented in time to enhance the buffering capacity of water body and reduce the sudden drop of calcium and magnesium hardness caused by rainstorm. Replenish again after heavy rain, quickly restore algae phase, meet the absorption of mineral elements by shrimp, and shell in time.

Hailianke's products are good in calcium and magnesium, rich in calcium and magnesium and various mineral elements, and the compound ratio is reasonable. Many shrimp farmers in China generally report that after using calcium and magnesium, the water color is refreshing, the proportion of algae phase is reasonable and the shrimp color is beautiful. Mainly the bacteria, algae and shrimp in the pond need mineral elements such as calcium and magnesium as raw materials for normal survival and physiology. Appropriate mineral elements can be used to re-establish the micro-ecosystem of the pond, so that the water color and shrimp can be quickly restored and the breeding rhythm can be facilitated.