Solve the mystery of culturing ricefield eel in thin film ponds

Q: can you introduce the technical characteristics of soilless culture of Monopterus Albus in still water in impervious membrane pond? Answer: the cost of building ① pool is low, the cost per square meter is less than 25 yuan (including piping facilities, labor costs and plastic film, etc.), the service life is 8 years, and the construction speed is fast, which overcomes the defects of high cost and slow construction of cement pool. And convenient maintenance, once the film cracks or holes, can be welded with plastic hot air welding torch; ② reclamation, such as no longer breeding, it is easy to restore the original land properties, suitable for the development and use of collective construction land after land transfer; ③ can be farmed all the year round to avoid the shortcomings of concentrated cage breeding season (June to September) and high seedling price, which can be reduced by 10 yuan per kilogram of seedlings. While overwintering is relatively easy, the water temperature is relatively high, and it can be sold at the highest price of eel before and after the Spring Festival, which can be sold by about 10 yuan per kilogram of eel. ④ uses less water and has a wide range of adaptation, so it can be cultivated either in courtyard or on a large scale; it can be cultured indoors (including balcony and roof) or outdoors; it can be cultured in fresh water or in saline-alkali land. ⑤ saves labor, has the same culture area, and is safe in operation; when diseases and insect pests occur in ⑥, it is easy to observe and take measures in advance, with no dead corner, good disease prevention and control effect, low drug cost, very smooth pool wall, no damage to the surface mucosa of rice field eel, and can prevent the occurrence of fish disease. The survival rate is 10% higher than that of the cage. In the low temperature season, the water temperature of ⑦ is often higher than that of cement pond, which is beneficial to prolong the feeding period of Monopterus Albus, the quality of cultivated Monopterus Albus is well controlled, the water is changed thoroughly, the shelf life of water is long, and there is no pollution to the water, and the income of by-products such as Loach and small miscellaneous fish is 20 yuan / fish.

Q: does membrane pond culture need to change water frequently? What about "symbiosis of fish and vegetables"? A: thin film pond culture uses special fish nests instead of soil, and water plants and water quality improvers are used to improve water quality. although the pond is small, the water quality can be maintained in a stable state by growing vegetables such as water celery and hollow vegetables on the surface of the water. Finally, there is no need to change water for raising eels and no more fertilization for growing vegetables. Generally, we require a change of water every 30 days in the spring and autumn season, but only once a half a month in summer. Usually, we only need to add part of the water lost due to evaporation. The patented technology of "symbiosis of fish and vegetables" is a major discovery made by Dr. Zhou Wenzong in the field of ecological breeding. In the fish-vegetable symbiosis system, aquatic vegetables can absorb nitrogen, phosphorus and other nutrients discharged by fish metabolism in cultured water, remove 80% of suspended matter and 70% of organic matter in water, and reduce biological oxygen consumption by 90%. And the PH value in the water can be kept in the standard range. Aquatic vegetables can also disinfect the water body (the plant fungicides secreted by its roots can kill 90% of the pathogens), making the fish pond water self-repairing. The full-price compound feed configured in this fish-vegetable symbiosis system contains high-quality raw materials such as fish meal and bone meal, which happens to supplement the supply of trace elements. The vegetables and fruits successfully planted are hollow cabbage, celery, lettuce, tomato, virgin fruit and strawberry.

Q: can the impervious membrane really guarantee a service life of eight years? A: in 2005, we began to use HDPE impervious membrane with smooth surface thickness 0.35mm to breed. The impervious film is made of high-quality high-density polyethylene primary resin made by Italian automatic geotechnical production equipment through three-layer co-extrusion technology, which is produced according to American GRI standard and ASTM test standard, non-toxic, environmental protection and rapid construction. The main composition is 97.5% high density polyethylene and about 2.5% carbon black, anti-aging agent, antioxidant, ultraviolet absorber, stabilizer and other auxiliary materials, which have good heat and cold resistance, good chemical stability, acid, alkali, organic solvent corrosion resistance, high rigidity and toughness, good mechanical strength, good resistance to environmental stress cracking and tear strength. It has excellent anti-puncture ability, can resist most plant roots, high anti-seepage coefficient, anti-aging, anti-ultraviolet, strong anti-decomposition, and can ensure the service life of the impervious film for eight years. And environmentally friendly and non-toxic. After several years of demonstration and promotion, we have continuously optimized and improved the construction technology and breeding technology, gradually standardized and programmed, produced better results, have been warmly welcomed by the majority of farmers, and have broad prospects for development.

Q: the impervious film is black, and the water temperature of the fish pond must rise very quickly in the heat of summer. No matter how good the shading treatment is, the water temperature can easily reach or exceed the high temperature limit of the eel, and the eel is not a dead fish. A: this inference is "very wrong"! You do not know, the film pond soilless ecological culture of rice field eel inhabit the lowest layer of the pool, although the temperature in the external air reached 37 ℃ above, but we through three-dimensional ecological culture, planting towel gourd, grapes, etc. play a sunshade effect, and then grow vegetables and transplant aquatic plants in the water, not only to purify the water quality, but also to play the effect of shading. Therefore, in general, the water temperature at 15cm below the water surface is only about 33 degrees, and in June, July and August in summer, the water level is generally around 30cm, and the water temperature is lower. Therefore, the water temperature at the bottom of the pool generally does not rise and fall suddenly.

Q: you use Fushou snail and field snail in the film pool as an ecological chain to maintain the natural balance of the ecosystem. As we all know, snails are the intermediate hosts of many germs. Won't using them increase the incidence of Monopterus Albus? Answer: Fushou snail has a wide diet and can eat the leftover feed and accumulated feces of Monopterus Albus, which can purify the water quality to a certain extent. We add 2 jin of Fushu snail or field snail to each 20-square-meter pond. While strictly sterilizing and disinfecting, we scientifically restrain the occurrence of ricefield eel disease by controlling the quantity. We do not arbitrarily put Fushu snail or field snail in rice eel pond.

Q: I think we all know that the temperature difference between inside and outside the greenhouse is very large. The fish ponds need to change water. The water temperature of the fish ponds inside the shed is relatively high, while the water temperature outside is relatively low. Will Monopterus Albus not catch cold?. A: there is a certain difference in water temperature inside and outside the greenhouse. Generally, the difference is about 5 degrees. Generally, we only need to change the water to 1/3 of the pool water volume. Don't you know "seedling training"?