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Winter aerators: Why can't they be stopped?
Many farmers believe that the water temperature is low in winter, fish activities are reduced, and oxygen consumption is reduced, so the aerator can be discontinued. However, this view is wrong. In winter ponds, the aerator still needs to be used scientifically, otherwise it may lead to serious hypoxia problems and affect the survival rate of fish over winter.
The invisible killer of winter hypoxia
In winter, the surface of the pond freezes or the water temperature decreases, and the water stratification phenomenon is obvious, and the exchange between the bottom water and the upper water decreases. At the same time, the photosynthesis of phytoplankton in the water weakens, and the oxygen production decreases significantly. In addition, the decomposition of organic matter at the bottom of the pond consumes a lot of oxygen, resulting in extremely low dissolved oxygen in the bottom water. If an aerator is not used, fish may decline and even die due to chronic hypoxia.
Principles of scientific use of aerators in winter
Adjust the boot time according to the weather
In winter, the aerator does not run all-weather, and needs to be flexibly adjusted according to the weather and changes in dissolved oxygen. Turn on the aerator for 1-2 hours at noon on a sunny day, use the aerator to agitate the water body, break the stratification, and transfer the upper layer of highly dissolved oxygen water to the bottom layer. On cloudy or snowy days, you can turn on the aerator for 2-3 hours in the afternoon, but avoid turning on in the early morning, because the dissolved oxygen is the lowest at this time, and turning on will accelerate oxygen consumption.
Select the appropriate type of aerator
In winter, it is recommended to use an impeller-type aerator or a microporous aerator. The impeller-type aerator has strong water lifting capacity and can effectively break the stratification; the microporous aerator can precisely aerate and is suitable for high-density breeding. Avoid the use of a water wheel-type aerator, whose aerating effect is poor at low temperatures.
Control boot duration and frequency
In winter, the aerator should be turned on for a total of 4-6 hours per day, which can be divided into 2-3 times. The specific can be adjusted according to the dissolved oxygen monitoring data to ensure that the bottom layer of dissolved oxygen is not less than 3mg/L. If there is an ice layer in the pond, holes need to be punched on the ice surface, and then the aerator can be used to facilitate gas exchange.
Maintenance and maintenance of aerator in winter
Antifreeze and lubrication
The aerator is outdoors for a long time, and anti-freezing measures need to be taken in winter. The motor part should be covered with a rain cover to prevent snow from infiltrating. Bearings and gears need to be filled with low temperature resistant lubricating oil to ensure the normal operation of the machine. Check the oil level before each use, and replenish it in time when it is insufficient.
Clean up ice and debris
The impeller of the aerator is prone to freezing, which affects the operating efficiency. The ice and debris on the impeller should be removed before each use. At the same time, check whether the floating body is damaged to prevent water from sinking. When not in use for a long time, it should be cleaned and stored indoors.
Common misconceptions about oxygenation in winter
- Myth 1: If the water temperature is low, there is no need for oxygenation
- In fact, the metabolism of fish decreases at low temperature, but the bottom oxygen consumption is still serious, and intermittent oxygen increase is required. - Misunderstanding 2: The more the aerator is turned on, the better it is
- Excessive oxygenation will cause excessive disturbance in the water body, affecting the dormancy of fish and increasing the stress response. - Misunderstanding 3: Only look at the dissolved oxygen meter data
- The dissolved oxygen meter data needs to be comprehensively judged in combination with weather and water temperature, and cannot be blindly relied on.
Practical skills of scientific oxygenation
With microecological preparations
When using an aerator in winter, microecological preparations such as Bacillus can be regularly sprayed to decompose the bottom organic matter, reduce the oxygen consumption factor, and reduce the oxygen consumption at the root.
Reasonable feeding management
In winter, fish feeding is reduced, and the feeding amount should be appropriately reduced to avoid residual bait corruption and oxygen consumption. A small amount can be fed at noon on sunny days to enhance fish physique.
Monitoring dissolved oxygen and water temperature
Install the online dissolved oxygen monitoring system to grasp the water changes in real time. When the dissolved oxygen is lower than 3mg/L, turn on the aerator immediately. At the same time record the water temperature to provide a basis for adjusting the startup strategy.
Winter aerator use case sharing
A farm insists on the scientific use of an aerator in winter. It is turned on for 2 hours at noon every day, and with micro-ecological preparations, the survival rate over winter is as high as 95%. The control pool without an aerator has a survival rate of only 70%, and there are many diseases in spring.
conclusion
It is not that the aerator is not used in winter, but should be used scientifically. Reasonable startup, careful maintenance, and misunderstanding can ensure the safe overwintering of fish and lay a solid foundation for breeding in the coming year. From today on, pay attention to winter aerobic, so that your breeding efficiency can be improved to a higher level.
