Huge round pots with a diameter of about 4 meters next to each other, fish such as long-necked bream, California bass, etc. swim in it happily ... On October 30th, we went to the fish girl aquaculture in Cantouzui Village, Anfusi Town, Zhijiang, Zhijiang Professional cooperatives, a “zero-emission” intensive new fish farming model for rearing aquaculture, have opened the eyes of reporters.
The cooperative has built a total of 16 aquaculture tanks. By the pond beside the tanks, the planted aquatic plants grow vigorously. "The tank is made of food-grade PE environmentally friendly material, and the water in the tank is connected to the water in the pond," said Yang Jun, deputy director of the Municipal Fisheries Station. "The metabolites produced by fish fall to the bottom of the tank and are then pumped to the solid on the land In the liquid separation tower, after sedimentation and solid-liquid separation, the solid metabolites are concentrated on the bottom of the tank, and are directly taken out for processing and reused.
Pointing to a separation tower standing on the shore, Yang Jun said: "The supernatant is filtered, aerated, biologically purified, etc., after removing ammonia nitrogen, it is returned to the pond for recycling. The aquatic plants and biological brushes in the pond can be reused. Further purify the water.
Yi Aiwu, the director of Yuya Cooperative, is a native middle-aged woman who returned to her hometown to start a business. Last year, when the cooperative was just set up, she was worrying about what kind of fish to raise. A message came out: The scientific research team of Professor He Xugang from Huazhong Agricultural University's Fisheries College has developed a new breeding model, namely the "zero-emission" captive system for ponds. Cooperative test unit.
"Adhering to the green ecology and taking the road of high-quality development will be the development direction of fisheries in the future." Encouraged by experts from the Municipal Fisheries Station, Yi Aiwu decided to introduce a new model by investigating and studying at Huanong Public Security Base and Yiye Farm Base. During the construction of the base, Professor He Xugang and the municipal aquatic station experts repeatedly visited the base for technical guidance. Last July, the third "zero-emission" captive demonstration base in the province and the first pond in Yichang were successfully completed.
"The species we try to cultivate are mainly high-end famous fish, and the breeding density is more than 3-5 times that of conventional ones. The trial survival rate is very high, the fish grows fast, almost no antibiotics are used throughout the breeding process, and the quality of the commercial fish is excellent and no mud. The fishy smell has achieved the goal of breeding in the year and the income of the year. "Yi Aiwu's words revealed comfort.
In order to maximize the water quality of the surrounding ponds, the cooperative has installed aerators, set up artificial biological floating islands, and floated aquatic plants such as water spinach. Yi Aiwu said, "Next, more biological brushes will be set up in Waitang. Biological floating beds and ecological floating islands should appropriately increase the planting area of aquatic weeds and properly place filter-feeding fish to regulate water quality and beautify the environment. "
The concept of "zero emissions" is advanced. What is the actual effect? During the interview, the reporter learned that from March of this year, Yichang and Zhijiang aquatic products stations will test the water quality outside the circle and after treatment every half a month. From the results of multiple tests, the treated water quality fully met the freshwater discharge standards.
"This model has been rated as the top ten leading agricultural technologies of the Ministry of Agriculture and Rural Affairs in 2019. The breeding capacity is 70 kg / m3 or more, the breeding efficiency is more than 20%, the drug use reduction is more than 50%, and the breeding tail water is 100% recycled. A "zero-emission", green ecological, and recyclable breeding model, "said Yang Jun. Since the completion of the Yuya Demonstration Base, nearly 1,000 people in the industry have come to visit and inspect. In September this year, Ji Bingxuan, vice chairman of the Standing Committee of the National People's Congress, spoke highly of the model when he visited the base.
Feng Depin, the director of the Municipal Fisheries Station, said that the Municipal Fisheries Station will vigorously promote the successful experience of the captive system of the fish girl cooperatives, summarize the experience and measures for the treatment of aquaculture tailwaters, and compile the standards for the "Technical Specifications for the Ecological Treatment of Freshwater Aquaculture Tailwaters". Adjust the breeding structure, change the breeding method, and guide fishermen to establish a green and healthy breeding concept. At the same time, it promotes ecological farming modes such as fish and vegetable symbiosis, reduces endogenous pollution, ensures normal water quality indicators, develops modern intelligent fisheries, and composes a new chapter in the development of green and high-quality fisheries.