How to cure the incurable diseases of fish and shrimp and crab at high temperature

Zhejiang News Client reporter Lai Yichen Zhao Jing Sharing Alliance Three Gate Station Chen Lingling

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Recently, the three -door temperature once broke through 43 ° C, refreshing the highest record in the same period. Seeing that the reading of water thermometers of 100 acres of breeding ponds has risen all the way, Fang Jun, a blue crab breeding household in Huaqiao Town: "The weather is too hot, and the blue crabs in the pond are prone to 'illness', and they will die every day."

Water quality monitoring data shows that the continuous high temperature and rainy weather leads to high water temperature and large evaporation, and the salinity of the seawater in the breeding pond rises to twice the usual usual. Fang Jun said that the seawater and salt are high, and the osmotic pressure in the crab body is not well adjusted. In addition, it is now intensive and high -density breeding, which is prone to hypoxia.

"Crab cannot molt the shell, the meat is long, the shell is not long, and the swelling is swollen to death." Although Fang Jun, who raised crabs for more than ten years, could probably guess the reason for the death of the crab, but still helpless.

"The breeding ponds are at the seaside, and there is no condition to cause a large amount of fresh water to reduce the salinity. What I can do now is to open more oxygen pumps to make the crabs be as good as possible." At the side of Fang Jun's breeding pond, the reporter saw that ten A few oxygen pumps rang, spreading flowers. Right now, he and many surrounding farmers live in the small house by the pond, taking care of day and night. "The electricity fee costs 5,000 yuan a month, which is about 3,000 yuan more than usual."

However, the cost of breeding continues to increase, but the crabs in the pond grow slowly. Under high temperature and heat, farmers are hard and worried.

Chen Caixiang, a villager in Totou Village, told reporters that at this time in the past, the crabs had three to two to a half pounds. "

Chen Caixiang said that one week before the Mid -Autumn Festival, the wholesale price of the blue crab can be 90 yuan to 100 yuan or even higher, and the festival will fall to about 60 yuan per catty. If the crab is too late to grow well and be reluctant to sell it cheaply, then the next golden period will wait until the spring next year, and it will need to raise a small amount of cost, which increases a lot of costs. "How to calculate, it's all a loss," he said.

Difficulty murmurs caused by high temperature weather not only troubles the three -door blue crab breeding. In Linhai, Huang Yuanming's South whitening pairing shrimp of shrimp was also a little strange disease. Under the environmental conditions of high salinity, high temperature, and highlights for a long time, the use of the original biological preparations has become smaller, and the large area of ​​cyanobacteria in the pond has caused the water quality to deteriorate and the phenomenon of dead shrimp intensified. Huang Yuanming couldn't do it: "My more than 180 shrimp ponds have to lose more than 200,000 yuan each."

Freshwater farming is not spared. "Once the fish has a red point, it will soon die." From mid -July, 30 acres of fish ponds in the black fish farming in Linghu Town, Nanxun District, Huzhou City, buried more than 600 in the same way every day. Black fish died of illness. "In April, let's go down in April, and it is already about 2 pounds of adult fish. It's a pity to die!" He said sadly.

How to relieve the dilemma of aquaculture at high temperature? The reporter asked the relevant experts from the Aquatic Promotion Station of the Provincial Agricultural and Rural Department. They suggested that the local aquatic department technicians help farmers to reduce water temperature as much as possible and improve water quality; they must also strengthen fine management and improve their own immunity.

At present, in Taizhou and Huzhou, local aquaculture experts are making suggestions for farmers through online communication and offline visit. "In addition to daily training, we are also being taught by a group of experienced" earth experts' among grass -roots farmers, and then they will drive the surrounding farmers to strengthen guidance with pointing. " introduce.

"Improving the water level of the farming pond is conducive to the cooling of the water body. At high temperature, shrimp and crab breeding should be kept more than 1.5 meters deep, and the fish should be maintained by more than 2 meters." "It is recommended to take the" rotation "measures, choose large individuals to go on sale to reduce breeding, reduce breeding Density, increase survival rate "" appropriately reduce the amount of feeding, feed to seven minutes "," Select fresh high -quality feed with high protein content, but do not feed ice fresh feed, it is easy to rot It is recommended to be passed on to the two places farmers.

"Under the existing conditions, I am raising the water level as much as possible, and it is 20 cm away from the expert's suggestion." Pang Tu Lin said that he plans to dredging his fish pond to meet the water depth requirements of more than 2 meters at high temperatures. Essence

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