1、 About phosphate detection
China Fisheries Channel reported that phosphorus in water exists in the form of organic phosphorus and inorganic phosphate. The detection of total phosphorus content requires heating and digestion of water for a long time, which can only be completed under laboratory conditions. The rapid detection of water quality is basically to test the inorganic phosphate in water. Although the detection value of phosphate can not accurately indicate the total phosphorus content in water, the higher phosphate can reflect the higher total phosphorus content in water.
2、 Phosphate ideal range
Phosphate is not toxic to fish. However, high phosphate can lead to a large number of algae in the water and indirectly affect the growth of fish. Over-propagating algae will consume a large amount of oxygen in the water, causing damage to the growth of fish. Phosphate has more significant effect on algae growth than nitrate.
Generally, when the phosphate detection value reaches 1mg/L, the water quality will be suitable for algae breeding. When the phosphate level reaches 2 – 3mg/L or higher, the algae growth will be difficult to control, and the algae explosion may occur at any time. Therefore, the ideal phosphate level should be below 0.05mg/L.
3、 Methods of reducing phosphate level
If the phosphate level is too high, the following methods can be used to reduce the phosphate level:
1. Water change: a large amount of water change can quickly reduce the phosphate level in the water. However, if the root cause of phosphate rise is not removed, changing water will only be a temporary solution.
2. Pond cleaning: removing sludge can effectively reduce the phosphate level.
3. Water quality treatment: the use of some phosphorus adsorbents and phosphorus removal chemicals can effectively reduce the phosphate in water, but this method is mostly used in aquariums and small fish ponds.
4、 Methods of controlling phosphate level
1. The main source of phosphorus in water to control the amount of fish feed is the feed left over by fish.
2. Phosphate may be used as a preservative in the feed of feed fish. Try to choose fish feed with low phosphate content.
3. Check the water quality of water source to avoid using the water source with phosphorus pollution.
4. Carefully select water treatment chemicals for water treatment or chemicals that change water quality may contain phosphate. When it is necessary to use chemicals for water treatment, try to use products with low phosphate content. When the water color turns green or changes, the first reaction of the farmers is that the algae is wrong. However, there is no way to judge whether it is really wrong. In fact, simple phosphorus measurement can help solve such problems. Only by learning to use instruments, using scientific basis to judge, and not listening to others' misleading, can scientific breeding be realized.