Aquaculture households often find that: "old water" is mostly copper-green or dark green, yellow when the more serious, brown or grayish gray, water quality, mixed, transparent, less than 20 cm, low dissolved oxygen, fish easy to float . The water color of "Lao Shui" does not change daily. There are many phytoplankton in the water, but most of them are non-digestible species such as cyanobacteria. The massive reproduction of phytoplankton causes the pH of the pool water to be high, which is not conducive to fish growth. This should be adjusted in the following way. After one year of pond cultivation, ponds in clear ponds will contain silt containing large amounts of organic matter and bacteria. Therefore, after each breeding period, it is necessary to conduct dredging and disinfection to remove harmful substances such as ammonia nitrogen and nitrite so as to improve the water quality. Disable quicklime When the water quality of the fish pond is in the "old water" state, quicklime application should be prohibited to improve the water quality. Because quicklime can make the pH of the pool further increase, it can accelerate the over-breeding of cyanobacteria. Adding new water and changing water is an effective way to solve pool water aging. The new water must be filled with good quality water, no pollution and rich dissolved oxygen. The number of water changes can be flexibly controlled according to the principles of looking at the sky, seeing the colors, and seeing the transparency. Open aerator in accordance with the "three open and two can not open" principle of the rational use of aerator, increase dissolved oxygen in water, promote material circulation, transform and decompose the bottom of the pool of harmful substances. Scientific investment in reducing the fish's feed coefficient, reduce the pollution of the feed water quality, should use the regular manufacturers of pelleted feed. Do not apply organic fertilizer, reduce nitrogen fertilizer, and appropriately increase phosphate fertilizer according to pond water quality. Transplanting Aquatic Plants Transplanting water hyacinths, water peanuts, and other aquatic plants in a fish pond can reduce ammonia and other harmful substances in the water. It can also absorb nitrogen and phosphorus in the water, reduce the pool water and improve water quality. The water quality improver or microecological preparation is not suitable for the ponds with poor water conditions or water exchange, and water quality improvers or microecological preparations are regularly applied during the aquaculture process to increase the oxygen at the bottom of the pond, degrade the harmful substances, and improve the water quality. surroundings. The use of filter-feeding fish to feed a suitable amount of filter-feeding cockroaches, cod fish, and allogynogenetic crucian carp can effectively control the excessive growth of phytoplankton such as blue-green algae and reduce the content of organic debris in ponds. Squid Tube,Frozen Squid Tube,Various Size Squid Tube,Frozen Illex Squid Tube Zhoushan City Shuangying Aquatic Products Co., Ltd.  , https://www.shuangying-aquatic.com