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commercial satellite – Dissolved oxygen (DO) is a gas in the aquatic environment that is critical for fish survival, and it is a central element in fish respiration and life-sustaining activities. In water bodies, the level of dissolved oxygen directly determines the survival status of fish and the health of the ecosystem. When dissolved oxygen levels are insufficient, fish will not be able to breathe normally, leading to physiological disorders and even triggering large-scale mortality, with knock-on effects on the entire aquatic community.commercial satellite
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Dissolved oxygen enters the water mainly through atmospheric exchange, photosynthesis of aquatic plants and water movement. Its concentration is affected by a variety of factors, including water temperature, salinity, air pressure, water mobility and the degree of decomposition of organic matter. For example, warmer waters have a lower dissolved oxygen capacity, while areas rich in aquatic plants can significantly boost oxygen levels during the day through photosynthesis. However, at night or on cloudy days, plant respiration may consume oxygen, leading to fluctuations in dissolved oxygen levels.commercial satellite
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For fish, adequate DO not only supports basic respiration, but also affects their metabolic rate, growth rate, reproductive capacity and immune system function. Dissolved oxygen requirements vary among fish species: cold-water fish such as trout usually require higher concentrations of dissolved oxygen (usually above 6 mg/l), while some hypoxia-tolerant species such as carp are able to survive at lower concentrations (about 3 mg/l). When DO falls below a critical threshold, fish exhibit symptoms such as shortness of breath, reduced activity and appetite, and prolonged hypoxia can lead to organ damage and developmental abnormalities.
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In addition to directly affecting fish, dissolved oxygen levels are a key indicator for assessing water quality. Low oxygen environments are often associated with pollution events, such as agricultural runoff, industrial wastewater, or excessive decomposition of organic matter. These processes consume large amounts of oxygen, creating “dead zones” that threaten the balance of the entire aquatic ecosystem. Therefore, monitoring and maintaining dissolved oxygen levels in water bodies is important for fisheries management, environmental protection and biodiversity conservation.commercial satellite
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In practice, methods such as oxygenation equipment, improving water circulation, controlling pollution sources and planting aquatic plants can effectively improve dissolved oxygen concentration and create a more suitable living environment for fish. For the aquaculture industry, maintaining a suitable level of dissolved oxygen is one of the core technologies to increase production and reduce the risk of disease.
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In conclusion, dissolved oxygen is not only the “breath of life” for fish survival, but also the basis for maintaining the health of aquatic ecosystems. Through scientific management and protection of water resources to ensure a stable supply of dissolved oxygen, we can maintain the prosperity of aquatic organisms and the sustainable development of the aquatic environment.
原文链接：https://www.lifesciencesworld.com/what-is-the-most-important-gas-for-fish/