In fish farming, the proper use of aerators is crucial for maintaining water quality and preventing issues like "floating fish." The timing of when to turn on the aerator plays a key role in ensuring that oxygen levels remain balanced throughout the pond. Activating the aerator at the right moment can significantly improve water conditions and avoid many common problems.
For instance, turning on the aerator during midday on a sunny day might not be ideal. At this time, the surface water is warmer, while the deeper layers are cooler, creating a temperature and oxygen gradient. If the aerator is started too early, it may not effectively mix the water layers, leaving the lower part of the pond with insufficient oxygen. However, if the aerator is activated at the right time, it helps to circulate the water, reducing temperature differences and replenishing oxygen in the lower layers.
On cloudy mornings, when sunlight is limited, phytoplankton produce less oxygen through photosynthesis. This leads to a poor overall oxygen level in the water. Starting the aerator early in the morning, especially when dissolved oxygen levels are low, can prevent fish from experiencing "floating head" due to oxygen deficiency before sunrise.
During rainy nights, prolonged cloud cover limits sunlight, which in turn reduces oxygen production by phytoplankton. To avoid fish dying from lack of oxygen, it's important to run the aerator during the middle of the night when oxygen levels are at their lowest.
In the evening, when the sun sets and photosynthesis stops, the upper layer of water no longer receives new oxygen. If the aerator is turned on at this point, the already low oxygen in the upper layer won't be replenished, and the oxygen in the lower layer will be rapidly consumed. This can lead to severe oxygen depletion overnight, increasing the risk of fish floating in the early morning.
Additionally, the duration of aerator operation also matters. During hot weather, it's better to run the aerator for longer periods, while in cooler conditions, shorter intervals are sufficient. In the middle of the night, longer operation is recommended, but during noon, it should be kept shorter. After fertilization, the aerator should be used for extended periods, whereas it should be turned off if no fertilizer is applied. Windy days call for longer running times, while calm days require shorter sessions.
By carefully managing both the timing and duration of aerator use, fish farmers can maintain a healthier aquatic environment, reduce stress on fish, and ultimately improve the overall productivity of their ponds.
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