During the summer high temperature period, the main sign of the quality of the culture ponds is the amount of dissolved oxygen in the water. Using the biological estimates of the dissolved oxygen in the pool, the water quality can be grasped to provide a basis for the scientific management of water quality. 1, see the fish reaction. Different aquatic animals have different requirements for dissolved oxygen in the water. In the pond, there are some aquatic animals that require high dissolved oxygen, such as carp and squid. Through observation, these oxygen-tolerant fish reactions can Estimated dissolved oxygen in water, under normal circumstances, the dissolved oxygen in water is greater than 4 mg per liter, no adverse reactions of fish, and dissolved oxygen is less than 4 mg per liter, the fish prone to adverse reactions, when these fish cluster water surface, When the air is directly swallowed and the floating head phenomenon occurs, the dissolved oxygen in the water drops to about 1 milligram per liter. When the fish swim wildly and lie on the surface of the water and suffocate, that is, when the pond is formed, the deep oxygen in the water is lowered to Increase 0.4-0.6 mg, in this case need to increase oxygen. 2, see how much phytoplankton. Phytoplankton carries out photosynthesis in water, absorbing carbon dioxide and releasing oxygen, thus increasing the dissolved oxygen in water, especially the green algae in water. It grows vigorously in the summer, absorbs
Nitrogen Fertilizer and carbon dioxide, and releases a lot of oxygen at the same time, making the dissolved oxygen in water up to one litre. 10 mg. Therefore, when Quanchipia sprays water disinfection and sterilizing medicine in summer, it is necessary to prevent the death of large numbers of green algae, cause oxygen deficiency in the pool, cause floating head phenomenon, and even cause flooding. 3, see the size of water grass coverage. Water plants in the ponds can increase dissolved oxygen by photosynthesis, absorption of nitrogen and carbon dioxide, and release of oxygen. When the water and grass cover in the pond reaches 1/2 of the whole pond, the dissolved oxygen in the water can reach more than 10 milligrams per liter at noon during the sunny day, and when the water grass covers 1/3 of the whole pond, the dissolved oxygen in the water can reach 8 milligrams per liter. The higher, so planting aquatic plants in ponds is an effective way to increase dissolved oxygen. 4, see the water color. The water is too light and there are few phytoplankton. The dissolved oxygen in the water generally does not exceed 5 milligrams per liter. When the water is too dark, the organic matter rots and decomposes, the dissolved oxygen is consumed, and the water quality deteriorates. At this time, the dissolved oxygen in the water is very low, generally not exceeding 4 milligrams per liter. Appropriate water color is bright green, yellowish green or dark green, which is the phenomenon of large-scale propagation of green algae. Under the water conditions, the dissolved oxygen in the water can reach 10 milligrams per liter.
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