Dissolved-oxygen levels can be high during most of a 24-hour period, but the response of culture species appears to be affected primarily by the lowest dissolved oxygen concentration during the night. It is generally accepted that the minimum daily dissolved oxygen concentration in pond culture systems is of greatest concern. Plants and algae do photosynthesis during the day and wind adds oxygen at night. Dissolved oxygen levels below about 6 mg/L can begin to have detrimental effects on pond life. Farmers use fertilizers to increase crop growth. Beneficial bacteria out-compete algae for available nutrients thus eliminating the aggressive blooms that can cause dissolved oxygen sags. Oxygen content of pond water. Farmers use fertilizers to increase crop growth. Dissolved oxygen is reduced by the biological decay of organic material such as decaying plants and animals or animal and human wastes. Algaecides reduce oxygen content as they kill off algae and create organic waste. Fish load is not the only consideration. Without oxygen life on earth in its present form would not be possible. Explanation: The presence of farm means cultivation of rice, sugar, wheat, sugar canes, Flowers, Vegetables etc. The more farms the less the oxygen concentration levels. This process is called Eutrophication. If drop waterhyacinth, duckweed or water spinach to make shelter when it's sunny, them gather together in a corner of the pond, do not drop more than 1/3 of the pond surface. The hotter the water the less oxygen it can hold, therefore cold water holds much more oxygen. Many farms also produce large amounts of animal waste. As the algae and other water plants grow they will consume the dissolved oxygen presence in the water of the pond and make oxygen depletion/ reduction in the pond. The common error, however, is to rely on more oxygenating plants as these only have some effect. Draw conclusions: Based on your data, how do farms affect oxygen levels in the pond? 11. By eliminating stratification and reducing the chances of dense algae and phytoplankton blooms, a pond owner can keep dissolved oxygen levels high and eliminate the stressors to the fish populations. Rectifying a lack of oxygen is simple enough. Draw conclusions: Based on your data, how do farms affect oxygen levels in the pond? Farmers use fertilizers to increase crop growth. There are many factors that affect the DO concentration in fish retailing tanks. This also applies to for life in water and thus to your pond. The oxygen plants produce is released into the pond water and maintains high levels of oxygen in the pond. Figure 11. Many farms also … In sequence of importance they include: Through the water surface by diffusion. Salinity, water temperature and atmospheric temperatures also affect dissolved oxygen. When it rains, excess fertilizer and waste can run off into nearby ponds and streams. A DO reading of 7 mg/L is desirable, and any reading above that should be considered excellent. The nutrients in these substances can … It happens in two major ways. Many farms also produce large amounts of animal waste. - Do not feed and fertilize with excess doses. Overcome the lack of oxygen in the pond: - Pond needs aeration. Oxygen content of the pond water can be influenced by two methods; by change of flow rate, and by aeration of pond water. Pond water is provided with oxygen through a certain number of sources. This will reduce the concentration of dissolved oxygen. Artificial control of the oxygen budget of water of fish ponds in this case means technical and practical measures which have direct effect on the dissolved oxygen content of the pond water. A lack of dissolved oxygen is the most common cause of fish kills in ponds. The temperature of your pond water has a profound effect on the amount of dissolved oxygen available in the pond. 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