Still using an aerator as a “lifesaver”? You’re so out of touch!

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2020-11-25

An oxygenator is a crucial piece of equipment for fish farming—indeed, it’s safe to say that no fish farm can do without one. Yet some people only turn on the oxygenator when the fish start showing signs of distress, treating it merely as a “life-saving device.” In reality, however, the oxygenator shouldn’t be viewed as a “life-saving device” at all; rather, it should be used as a “productivity-enhancing tool.” Why is that? You need to understand that many abnormal water quality indicators are actually caused by insufficient oxygen levels. Why do nitrite levels exceed the standard? Why do ammonia and nitrogen levels spike? Why does hydrogen sulfide become excessive? It’s because of inadequate dissolved oxygen in the water, which allows leftover feed, fish waste, and decaying algae to break down into these harmful substances. And even before the fish start showing signs of distress, these harmful substances have already begun accumulating. If you treat the oxygenator solely as a “life-saving device,” sooner or later those harmful substances will accumulate beyond acceptable levels—and by then, turning on the oxygenator won’t make much difference anymore.

An oxygenator is a crucial piece of equipment for fish farming—indeed, it’s safe to say that no fish farm can do without one. Yet some people only turn on the oxygenator when the fish start floating at the surface, treating it merely as a “life-saving device.” In reality, however, the oxygenator shouldn’t be viewed as a “life-saving device” at all; rather, it should be used primarily as a “productivity-enhancing device.”

Why is that so? You need to understand that many abnormal indicators in water are actually caused by insufficient oxygen levels. Why do nitrite levels exceed the standard? Why do ammonia-nitrogen levels spike? Why does hydrogen sulfide exceed the limit? It’s because of inadequate dissolved oxygen in the water—when oxygen is scarce, leftover feed, feces, and dead algae in the pond get broken down into these harmful substances. And even before the fish start showing signs of floating at the surface, these harmful substances have already begun to accumulate. If you treat an aeration machine merely as a “lifesaver,” sooner or later, harmful substances will still exceed the permissible limits. By then, no matter how much you run the aeration machine, it’ll be too late to make much difference.

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The 25th China International Fisheries Expo will be postponed to October 27–29, 2021. The 25th China International Fisheries Expo will be postponed to October 27–29, 2021.

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The relationship between water convection and dissolved oxygen levels in aquatic bodies: The introduction of an aeration device can effectively regulate dissolved oxygen levels.

Although fish floating to the surface can be caused by a variety of factors, in addition to excessive stocking density, overloading the total fish biomass, and poor water quality, the convective properties of water are also a major factor that cannot be overlooked. Simply put, when water temperature is low, its specific gravity (or density) increases, causing it to sink; conversely, when water temperature is high, its specific gravity (or density) decreases, making it float upward. Understanding and mastering the principles of water convection will greatly facilitate the smooth operation of aquaculture. On warm days, after being heated by the sun during the day, the warmer, lighter water tends to stay on top. As the sun sets and the air temperature begins to drop, the upper layer of water cools down, increasing its density, and gradually starts to sink. If the nighttime temperature remains relatively high, the water cools down slowly, and the upper layer won't reach the bottom of the pond until early morning. This is one of the main reasons why oxygen levels tend to drop sharply from late night into early morning on hot days. However, if a heavy rainstorm occurs in the evening, the situation changes dramatically. The cold, heavy rainwater quickly sinks to the bottom of the pond, stirring up sediment, leftover feed, fecal waste, biological residues, and other organic matter from the pond bottom and bringing them into the middle and upper layers of the water. These harmful organic substances rapidly deplete the dissolved oxygen in the water. Before dawn even breaks, the dissolved oxygen in the water may be completely used up, leaving the fish vulnerable to oxygen depletion and causing them to float to the surface—a phenomenon known as "floating and surfacing." Therefore, sudden heavy rainfall in the evening or at night can also lead to oxygen depletion and fish floating to the surface.

2020-11-12

How to choose an aerator?

Oxygenators are used to increase the oxygen content of water bodies. There are many types of oxygenators available, including impeller-type, paddle-wheel type, aeration-type, air-injection type, spray-type, and jet-type oxygenators. Oxygenation helps save fish and ensures high yields. According to measurements, each ten-million-unit impeller-type oxygenator can add more than 1.8 kilograms of oxygen to the water per hour—enough to meet the respiratory needs of several tons of fish for an entire hour—and can promptly address oxygen deficiency in pond fish. After using oxygenators, the production conditions of fish ponds have shifted from natural ecosystems to artificially controlled ecosystems, thereby breaking through the limitations on fish yield imposed by still-water ponds under natural conditions.

2020-11-12