The Effect of Dissolved Oxygen on Water Quality
Dissolved oxygen in the water body is one of the most important factors in the aquaculture environment. In the aquaculture water body, dissolved oxygen is not only a comprehensive reflection of the physical and chemical properties of the water body and biological processes, but also an important parameter of the production performance of aquaculture ponds.
Dissolved oxygen in the water body is not only the basis for the respiration and metabolism of various aquatic organisms, the level of dissolved oxygen directly reflects the quality of the water body, which is closely related to the survival and reproduction of aquatic organisms and the self-purification of the water body.
For the rule of change of dissolved oxygen in aquaculture ponds, previous researchers have made a lot of studies, but for the rule of change of dissolved oxygen in the coastal mudflat aquaculture environment is very little research, especially the lack of time change and its influence on the analysis of factors.
Seasonal changes in dissolved oxygen levels are mainly related to changes in seawater temperature and the activities of aquaculture objects, of which temperature is particularly important. When the water temperature is low, the oxygen content in the water body will increase with the solubility of oxygen in the water and rise; on the contrary, the oxygen content in the high temperature water body will be reduced due to the decrease of its solubility; especially in summer and winter, the water temperature and the level of dissolved oxygen form an obvious contrast.
The level of dissolved oxygen in the water body and the level of chlorophyll A is positively correlated, the main is Haraoka is affected by plant photosynthesis. That is, under light irradiation green plants absorb inorganic salts and C02 to synthesise organic matter and produce oxygen, and the reduction of C02 in seawater leads to a relative increase in the proportion of HC03- and C032-, and therefore an increase in pH.
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