Excessive silt accumulation in the aquaculture ponds, excessive application of drugs, and excessive residual feed can cause water pollution. Biological control of aquaculture water pollution can begin with controlling aquaculture water quality, thorough dredging and disinfection, and promoting ecological farming. 1. Control water quality. Controlling the quality of aquaculture water is usually based on blocking and sedimentation. Blocking: Set fences made of bamboo foil or mesh at the inlet of water sources to prevent the entry of predator organisms, floating objects and suspended matters. The larvae incubate water, and add screens inside the fence. The screen material is nylon sieve. The size of the head depends on the application; factory-cultivated wastewater is sieved to remove feces, residual feed and suspended matter. Precipitation: A sedimentation tank is installed at the inlet of the culture zone, and the suspended matter is separated from the water by using sedimentation and floating. In particular, water bodies with large aquaculture areas and muddy water sources have settling ponds at the inlet and planted water plants in the ponds. 2, dredging and disinfection. Thorough dredging, disinfection and exposure before stocking will convert hydrogen sulfide and ammonia gas into harmful substances and improve water quality and sediment quality. 3, ecological farming. A large area of ​​shrimp and crab breeding water is transplanted with aquatic plants such as Vallisneria, Echinochloa, Elodea and so on to provide plant feed and habitat for shrimps and crabs, promote oyster shells and regulate water quality. According to the environmental and water exchange conditions, aquaculture species, seed specifications, breeding methods and other reasonable stocking, adjust the culture structure. 4, feeding methods. Feeding methods are artificial feeding of green feed and other plant feeds, to granular, automated development, input 100 kilograms of loose feed into the water, the loss of 23.4 to 27 kilograms, this part of the feed increased the temperature of the water temperature table. Feeding pellets can reduce feed loss and water pollution. 5, biological inhibition. The use of microorganisms in the water to oxidize and decompose organic pollutants, so that the water purification, and more for industrial farming. Microorganisms such as EM bacteria are introduced into water bodies to convert organic matter, ammonia nitrogen, and nitrite nitrogen in water bodies and sediments into beneficial substances, inhibit the growth of harmful bacteria, and prevent diseases.
Arch greenhouse is a kind of economical greenhouse, which is welcomed by the users with graceful curve form and low cost. It has beautiful appearance, fluent visual, reasonable structure and good performance for keep temperature. It is economical greenhouse because of its relatively low manufacturing cost. It can be applied in most areas of China. Double membrane greenhouse is used more in north of China, while single film greenhouse is used more in southern region. It can get maximum sunlight when visible light is within the scope of 0.4 to 0.7 microns and form a thick envelope, which can effectively prevent heat loss and prevent the invasion of cold air. Adopting a double membrane can greatly improve heat preservation performance of the greenhouse and save operating cost. The top cover material is polyethylene lifelong anti-fog and anti-dipping film po-covering. The outer of it has the function of UV protection and the inner has the function of preventing from the sets of dew. According to the needs of customers, the sides of the greenhouse can be covered with polyethylene lifelong anti-fog and anti-dripping po-covering or polycarbonate hollow plate.
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