The practice of aquaculture production shows that the pond retains 15 cm to 20 cm thick silt, which can play a role in maintaining fertilizer, supplying fertilizer, and buffering water quality. However, if the sludge is too thick, it will not only weaken its beneficial effect, but also reduce the capacity of the pond water body and reduce the living space of the cultured objects; the organic matter in the sludge will be oxidized and decomposed under the action of microorganisms, and will consume water-soluble oxygen, causing the fish to float and overturn the pond; Ammonium, hydrogen sulfide, and other reduced intermediates that are toxic to fish inhibit the growth of aquatic products. Many parasites of aquatic products or dormant worm eggs and pathogenic microorganisms of intermediate hosts are trapped in silt, leading to outbreaks and epidemics of fish diseases. . According to the determination, the siltation thickness of intensive fish ponds generally increases at a rate of about 10 cm per year. The improvement of pond silt is generally carried out in the winter and spring seasons. First of all, drain the pool water and perform mechanical desilting by artificial or mud pumps; then, the frozen soil drying pond should be disinfected with quicklime before the irrigation water is put into use. In the normal aquaculture production process, submersible underwater dredging machines can be used to allow dredging with water under conditions permitting, and some upright or submerged plants can be planted in ponds to absorb the organic matter in the sediments. Improve the role of sludge.
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