Yangcheng Lake hairy crabs will be absent from the Mid-Autumn Festival table. Why is the output of hairy crabs delayed?

Because the continuous high temperature in summer is not conducive to the growth of hairy crabs.

Hairy crabs are regarded as the standard of Mid-Autumn Festival table, but this year, due to the abnormal climate, the production of hairy crabs was delayed and could not appear on the Mid-Autumn Festival table. When the high temperature continues in summer, the water temperature of hairy crabs remains high for a long time, which will lead to the decrease of dissolved oxygen concentration in water. Hairy crabs are prone to lack of oxygen when they grow, and they will suffocate and die after a long time. Therefore, the output of hairy crabs has been greatly reduced this year, and the growth rate of hairy crabs that have not died has also slowed down significantly.

Because the amount of dissolved oxygen in high-temperature water decreases, the number of microorganisms in the water will also decrease, and the growth and reproduction of organisms such as algae will be affected by temperature. After their number is reduced, they will not be able to provide enough food for hairy crabs, leading to major problems in food sources. Those hairy crabs that are not suffocated by hypoxia will also be malnourished, and their growth rate will be much slower than in previous years.

For these reasons, the annual output of hairy crabs in Yangcheng Lake decreased by about 20% compared with previous years, and the time for these hairy crabs to enter the last molting was also delayed a lot. Although those hairy crab farmers have taken various measures to make hairy crabs appear on the Mid-Autumn Festival table as scheduled, such as increasing oxygen in water, changing water and planting aquatic plants, they still failed to solve the problem. The effect of continuous high temperature on crab growth is difficult to reverse.

Due to the continuous high temperature in summer, Yangcheng Lake hairy crabs are absent from the Mid-Autumn Festival table. At this time, the influence of natural weather cannot be changed by human beings. However, a large number of hairy crabs should be listed before and after the National Day, which can catch up with a sales peak and should make up for the economic losses of farmers. If they are not listed as scheduled before the National Day, these farmers will suffer huge economic losses and affect their annual economic income. Moreover, the production was greatly reduced, and the sales season was missed, which was a fatal blow to farmers. Now a large number of farmers are pinning their hopes on the Mid-Autumn Festival market, hoping to gain something by then.