Fish ponds are free in the winter

The silt in the fishpond pond is due to the continuous accumulation of dead organisms, fish manure, residual feed and organic fertilizers, etc., together with sediment mixing, gradually formed at the bottom of the pool. Dredging is the removal and improvement of these sludges. With the application of high-density and intensive farming models, the pond's stocking density increases, and the dredging of ponds is particularly important.
Pond dredging has the following advantages: 1. Dredging can improve water quality, reduce the production of ammonia, hydrogen sulfide, methane and other harmful gases from organic matter fermentation, and improve the living environment of fish. 2. dredging sludge to remove pathogens, reduce the incidence of fish diseases. 3. dredging to increase the depth of the pond, to increase fish activity space, the density of fish in the pond a corresponding reduction in the growth rate accelerated. 4. cleared sludge as a fertilizer in the cultivation of green fodder.
The dredging of the pond is usually done during the winter and spring free time. The pool water is drained first, and artificial or mechanical (mud pump) dredging is performed, and then the frozen soil is dried. Before the influent water is put into use, the quick lime is used for disinfection again. Mechanical dredging There are two main types of dredging: 1. After the fish is sold out in winter, the pool water is drained and exposed for a period of time. The bulldozer is used to push the mud at the bottom to the bottom of the pool, and the bottom is pushed flat to leave no mud. This method is more suitable for high-yield fish ponds. 2. After selling fish in winter, leave about 20 centimeters of water in the pool. Drain the mud at the bottom with a high-pressure water gun. Then use a mud pump to pull the mud out of the pool. After leaving the bottom, leave 5 to 10 cm thick at the bottom. Sludge. This method is more suitable for cultivating fish ponds with less density.

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