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1. Causes of insufficient dissolved oxygen in aquaculture
(1) High temperature
The solubility of oxygen in water decreases with the increase of temperature, for example, in an atmosphere of pressure, the water temperature rises from 10°C to 35°C, the solubility of oxygen in pure water can be reduced from 11.27 mg/l to 6.93 mg/l. The high temperature will cause the dissolved oxygen to decrease. In addition, fish and other organisms consume more oxygen at high temperatures due to increased feeding movement is also an important reason.
(2) Excessive breeding density
Fish farming is bent on the pursuit of high production, fry mu stocking is too large, beyond the normal stocking amount. In this way, fish and water biological activities respiration increased, of course, oxygen consumption also increased.
(3) Decomposition of organic matter
The decomposition of large amounts of organic matter causes high bacterial activity, which consumes a large amount of oxygen in the water and therefore tends to cause hypoxia.
(4) Hypoxia caused by oxidation of inorganic substances
Oxidation of hydrogen sulphide and nitrite present in farm pond water and pond sludge can occur, resulting in the consumption of large amounts of dissolved oxygen.
3. Fish hypoxia response conditions
When mild hypoxia, fish and shrimp appear irritable, from the surface of the water can clearly see the waves of fish and shrimp swimming, individual fish and shrimp head out of the water, breathing faster; severe hypoxia, a large number of fish and shrimp will float head, or even die.
Therefore, choosing dissolved oxygen sensors to monitor the dissolved oxygen content values in water in real time will help to identify water quality problems and make timely adjustments and improvements, which will help the production value of aquaculture and maintain healthy water quality.
