Using new technology to raise fattening shrimp

Fengma Yi Village, Hengli Town, Nansha District, Guangzhou City. Xu Zhihua contracted 60 mu of pond to raise Penaeus vannamei. In 2007, under the guidance of agricultural technicians, he used enzyme technology and fish and shrimp fertilizer, and achieved a net income of 5000 yuan per mu.

Xu Zhihua carried out comparative experiments in two ponds. The No. 1 pond was sprinkled with enzyme bacteria, fertilized and watered with fish and shrimp, and 50,000 shrimp fry were released per mu. He applied sparingly, without using water purifying agents and fungicides throughout the process, but there was no phenomenon of floating head and dead shrimp, and the survival rate of shrimp was more than 95%. When harvested four months later, 1750 kilograms of shrimp were collected and about 800kg could be stored in the pond. He has a net income of 5000 yuan per mu, with remarkable economic benefits.

Xu Zhihua's No. 2 pond covers an area of 5.5 mu, which is the same batch of shrimp seedlings as No. 1 pond in the same period, with the same stocking density, but it is managed by conventional methods. In early May, the No. 2 pond was suddenly covered with cyanobacteria, prawns swimming in the pond, not eating bait, and dozens of dead shrimp appeared on the edge of the pond every day. Xu Zhihua applied enzyme bacteria and fish and shrimp fertilizer in the No. 2 pond. Three days later, the cyanobacteria disappeared, the phenomenon of floating head of prawns decreased, and they resumed eating bait. No dead shrimp was found after May 23. At the time of acceptance on June 21, the No. 2 pond had collected 800kg shrimp on the market, and there were still about 750kg shrimp in the pond, with an average yield of 281.5 kg per mu. The bait in No. 2 pond decreased relatively, but the drug cost increased, and the net profit was about 630 yuan per mu.

Under the condition of the same shrimp fry stocking at the same time and the same density, when enzyme bacteria and fish and shrimp fertilizer were applied throughout the No. 1 pond, the water culture effect was good, the survival rate of shrimp was high, the growth rate was fast, and the cost of drugs such as water purifier and fungicide and part of the bait cost were saved. the net income is 4370 yuan more than that of the No. 2 pond managed by conventional management.