Choosing a dual-speed aerator can be challenging for users, as it requires accurately assessing the operating conditions under numerous unstable environmental factors—including water temperature, animal species, animal density, water salinity, climate and temperature, natural wind speed and pressure, pond size and depth, water quality, fertilizer application rates, and feed consumption. Naturally, the water circulation flow rate is a critical factor in selecting the appropriate performance of a dual-speed aerator.

Choosing a dual-speed aerator can be challenging for users, as it requires accurately assessing the operating conditions under numerous unstable environmental factors—including water temperature, animal species, animal density, water salinity, climate and temperature, natural wind speed and pressure, pond size and depth, water quality, fertilizer application rates, and feed consumption. Naturally, the water circulation flow rate is a critical factor in selecting the appropriate performance of a dual-speed aerator.

1. The impeller-type aerator boasts excellent power efficiency and a large working area, making it suitable for four species of farmed fish.

2. The experimental results show that the hydro-turbine dual-speed oxygenator has excellent power performance, strong flow-promoting effect, and significant surface oxidation action, making it well-suited for shrimp and crab farming.

3. The dual-speed submersible aerator and the jet dual-speed aerator are suitable for deep-water aquaculture and long-pond aquaculture.

4. The small-area pond equipped with a water-spraying aerator can increase oxygen levels and is suitable for small fish ponds in garden-style tourist areas, but it cannot effectively increase oxygen in large-area ponds.

5. The deeper the water, the better the effect. The dual-speed aerator enables oxygen to dissolve smoothly in the water without harming the bodies of fish and shrimp. It is suitable for aeration in fish, shrimp, and fry ponds.

Among these, the turbine aerator is currently the most efficient type of aeration equipment. The principle behind the turbine dual-speed oxygenator is to induce convection and diffusion between the upper and lower layers of the water body, spreading oxygen throughout the surrounding area. Its four-blade impeller significantly increases the dissolved oxygen content in the water, making it particularly suitable for shrimp and crab farming.

Principles for using a dual-speed aerator:

(1) During sunny noons, run the aerator for 1–2 hours to fully harness its mixing effect, increase dissolved oxygen levels in the pond water, accelerate the circulation of substances within the pond, improve water quality, and reduce the occurrence of fish floating with their heads up. Be careful not to start the aerator on clear evenings, as this could cause premature convection between the upper and lower water layers, increasing oxygen consumption throughout the water column and making it easier for fish to float with their heads up.

(2) On cloudy and rainy days, phytoplankton photosynthesis is weaker, leading to insufficient dissolved oxygen in the pond water and increasing the likelihood of fish surfacing. At such times, it’s crucial to fully utilize the mechanical function of the aerator by promptly starting it up at night to directly boost the dissolved oxygen level in the pond water, thereby preventing fish from surfacing. Avoid starting the aerator at noon on rainy days. Starting it up at this time not only fails to increase dissolved oxygen in the lower layers of the water but also accelerates the consumption of dissolved oxygen in the pond, making it very easy for fish to float to the surface.

(3) During the summer and autumn seasons, water temperatures are high during the day, leading to high biomass and increased oxygen consumption. It is generally advisable to start the aeration equipment at dawn to increase dissolved oxygen levels. If there are signs of fish surfacing for air, the equipment should be immediately activated; it can only be stopped once the surface of the water is free of fish after sunrise.

(4) When the fertilizer application rate is high and the water quality becomes overly rich in nutrients, the aerator should be started at noon and early in the morning on sunny days to improve the dissolved oxygen levels in the pond water and prevent fish from surfacing for air. In addition to the weather conditions, water temperature, and water quality mentioned above, the use of a dual-speed aerator should also take into account the specific circumstances of fish farming. By closely monitoring the patterns of change in dissolved oxygen levels in the pond water, operators should flexibly adjust the start-up methods and timing to achieve rational usage, thereby enhancing both yield and efficiency.