In aquaculture, the amount of dissolved oxygen is a crucial parameter. It is not only related to the survival of aquatic organisms, but also directly affects the efficiency of aquaculture. So, what factors affect the amount of dissolved oxygen in aquaculture ponds?
1.Changes in temperature
As the seasons change, the water temperature changes accordingly. You may have noticed that on a hot summer day, a thin film of oxygen sometimes appears on the surface of a fish pond or pool. This is because as the water temperature increases, the solubility of oxygen decreases, resulting in a decrease in the amount of dissolved oxygen in the water body. At the same time, high temperatures also enhance the respiration of aquatic organisms and microorganisms, further increasing oxygen consumption. Dissolved oxygen analyzers
2.Fluctuations in air pressure
Changes in air pressure also have a direct effect on the amount of dissolved oxygen. When the air pressure decreases, the solubility of the water body decreases, which means that the amount of oxygen that the water body is able to hold decreases. Especially before a rainy day or typhoon, the amount of dissolved oxygen in the pond usually decreases significantly due to the decrease in air pressure.
3.Photosynthesis of algae
Many people may not know that a large part of the dissolved oxygen in water bodies is produced by algae through photosynthesis. In the presence of sufficient light, algae are able to use light energy for photosynthesis to produce large amounts of oxygen. However, if algae are not abundant or subject to environmental stresses (e.g., pollution, high water temperatures), their photosynthesis is inhibited, resulting in a decrease in dissolved oxygen.
4.Effect of stocking density
In aquaculture, culture density is an important economic indicator. However, too high a culture density can lead to increased respiration in aquatic organisms, which in turn increases oxygen consumption. When oxygen is consumed in excess of what the water body can provide, hypoxia occurs, and in severe cases, it can even lead to the mass death of aquatic life.
5.Decomposition of organic and inorganic matter
It is inevitable that some organic and inorganic residues will be produced in the culture ponds. These substances consume a large amount of oxygen during their decomposition. Especially when the organic content is too high, the bacteria will multiply and accelerate the decomposition process, resulting in a rapid decline in the amount of dissolved oxygen.
In order to maintain the appropriate level of dissolved oxygen in aquaculture ponds, we need to pay close attention to the changes in these factors and take appropriate management measures. For example, increase the frequency of water changes during high summer temperatures, reasonably control the breeding density, and regularly clean up the bait and sediment. Only in this way can we ensure the healthy growth of aquatic life and the efficient aquaculture.