Aquatic environment health is crucial for the survival of all aquatic species, including fish, shrimp, plants, and invertebrates. Monitoring the level of dissolved oxygen in the water supply is the most effective method to ensure the well-being of the aquatic environment.

Dissolved oxygen refers to the oxygen that has dissolved into the water, either through aeration or diffusion from the surrounding air. Adequate levels of dissolved oxygen are crucial for the health of fish and other aquatic life. A decline in the quality of the aquatic environment can lead to insufficient dissolved oxygen levels, which can negatively impact the well-being of the organisms. If the level of dissolved oxygen in the water becomes too low or too high, it can lead to deterioration of the aquatic environment. To ensure that the dissolved oxygen level is appropriate, it is important to understand and select the right dissolved oxygen sensor for your system.

What is dissolved oxygen? Why it is important to maintain dissolved oxygen concentration in water?

Water and other liquids contain dissolved oxygen, which is in a non-compound form. This type of oxygen is important for assessing water quality because it is vital for the organisms that inhabit it. When studying lakes, dissolved oxygen is considered the second most important component in a body of water, with only the water itself being more significant.

When the level of dissolved oxygen in water becomes too high or too low, it can have a negative impact on the water's quality and aquatic life. Non-compound oxygen is oxygen that has not linked to another element, leaving free molecules of O2 in the water. Fish, plants, invertebrates, and microbes are among the aquatic creatures influenced by dissolved oxygen levels since they rely on it for respiration.

The important role of dissolved oxygen in aquaculture

1. Provide oxygen necessary for the life activities of farmed animals

From the perspective of energetics and biochemistry, animals eat to convert the energy stored in food into energy that is necessary for their own life activities and can be directly used, and the oxygen inhaled through breathing provides a guarantee for the ultimate realization of this conversion through biochemical reactions at the molecular level. Once there is a lack of oxygen, these biochemical reaction processes will be terminated and life will be declared over. In practice, people have a relatively clear understanding that oxygenation can solve the problem of farmed animals floating and prevent pond flooding, but because of this, many farmers only regard oxygenation as a "life-saving" measure, and do not fully realize that low oxygen has already caused harm to farmed animals and the water environment before this.

2. It is conducive to the growth and reproduction of aerobic microorganisms and promotes the degradation of organic matter

Aerobic microorganisms are crucial to the degradation of organic matter in water bodies. Under aerobic conditions, feces, leftover bait, biological corpses (including dead algae) and other organic debris entering the water body are gradually degraded into various soluble organic matter by various extracellular enzymes produced by microorganisms, and finally become simple inorganic matter to enter a new material cycle, thereby eliminating organic pollution in water bodies. All of these require the participation of oxygen.

3. Reduce the effects of toxic and harmful substances

Oxygen can directly oxidize toxic and harmful substances in water and bottom sediments, reducing or eliminating their toxicity. Oxygen has strong oxidizing properties and can directly oxidize highly toxic hydrogen sulfide (H2S) and nitrite (NO2-) in water into low-toxic sulfates, nitrates, etc.

4. Inhibit the activity of harmful anaerobic microorganisms

Under anaerobic conditions, anaerobic microorganisms become active and perform anaerobic fermentation of organic matter, producing many malodorous fermentation intermediates, such as cadaverine, hydrogen sulfide, methane, ammonia, etc., which cause great harm to farmed animals. Under low oxygen conditions, water bodies and bottom sediments turn black and smelly, mainly because hydrogen sulfide in them produces black precipitation when it meets iron. Higher dissolved oxygen in water bodies will inhibit such harmful anaerobic microorganisms and help create a suitable breeding environment.

5. Enhance immunity

Sufficient dissolved oxygen in water can also help improve the tolerance of farmed animals to other adverse environmental factors (such as ammonia nitrogen, nitrite, etc.) and enhance resistance to environmental stress. Animals in a continuous low dissolved oxygen environment have reduced immunity and weakened resistance to pathogens. Studies have shown that when the dissolved oxygen in the water is insufficient for a long time, the susceptibility of spotted forktail to bacterial diseases increases.

How to monitor Dissolved Oxygen in Water?

Optical dissolved oxygen meters use a special dye to measure the dissolved oxygen levels. Yosemitech has specially launched a dissolved oxygen sensor for aquaculture, adopting fluorescent materials independently developed by our self. No need for oxygen consumption, flow rate restrictions, electrolytes, maintenance, or calibration. This dissolved oxygen meter demonstrates outstanding resistance to interference and stability. It has a built-in temperature sensor, automatic temperature compensation.

Y505-A Dissolved Oxygen Meter for Aquaculture-Water Quality Sensor Manufacturer-Yosemitech (yosemitesensors.com)

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