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The change of dissolved oxygen at the bottom is an important indicator that reflects the health of fish and shrimp, and can make a scientific reference for the management of bottom quality and water quality.
Use the oxygen measuring instrument to grasp the changing rules of dissolved oxygen in the water. Dissolved oxygen should be recorded four times a day: once at 05:30 in the morning and at a lower stage of dissolved oxygen in the day; at twice at 08:30 in the morning, it can be used to start feeding The basis is three times at 15:30 in the afternoon, the stage of higher dissolved oxygen in a day; the fourth time is at 23:00 in the evening, which can be used as a basis for whether to open all aerators. Through long-term observation and recording, it is possible to predict changes in sediment and water quality and adjust in advance.
1. The change of dissolved oxygen at the bottom should not exceed 7mg / L in a day. This is an important indicator of fish and shrimp health. The bottom quality and water quality are both good, suitable for the growth of fish and shrimp.
Special attention: in the early stage of aquaculture, if harmful algae are produced due to the unbalanced algal phase, although the dissolved oxygen at the bottom changes normally, fish and shrimp may also become ill. Therefore, in the early stage of farming, microbial preparations for removing organic matter from the bottom of the pond and cultivation of beneficial algal phases should be regularly placed; in the mid-to-late period of culture, microbial preparations for removing organic matter from the bottom of the pond and degrading nitrite and ammonia nitrogen should be regularly placed to reduce the organic-induced Hypoxia, cultivate beneficial bacteria phase and algae phase; regularly put the powder fired from shells to increase the total alkalinity of the cultured water body, the suitable total alkalinity for shrimp culture is 100-200, more than 300 or less than 60, shrimp are all Not easy to raise. Stable pH value, suitable pH value for breeding is 7.8-8.6.
2. The dissolved oxygen in the bottom changes within 8-9mg / L within a day, indicating that the pond culture environment is in a sub-healthy state, the water quality is relatively fertilizer, the algae tends to be rich, and the bottom quality changes in an undesirable direction, and the bottom of the pond begins to breed a large number of harmful bacteria, Ammonia nitrogen, nitrite and hydrogen sulfide cause fish and shrimp to grow slowly.
Treatment methods of aerator manufacturers: A. Reduce feed and mix with microbial preparations to enhance fish and shrimp physique; B. Kill some excessively propagated algae (such as spilling chlorine dioxide at 6:00 in the morning); C. Pond Bottom: Oxygenation and disinfection at the bottom (such as sprinkling hydrogen peroxide or dry sprinkling of oxygenation agent at more than 11:00 pm), applying microbial preparations at noon on the third day, cultivating beneficial bacterial phases, and cultivating the habit of regularly using microbial preparations; D. shelling Powder to increase the total alkalinity of the water body and stabilize the water body.
3. The change of dissolved oxygen at the bottom exceeds 10mg / L within a day, indicating that the fish and shrimp breeding environment is in an unhealthy state, the bottom quality is severely blackened, the water quality is severely over-fertilized, the algae are too rich, and the shrimp crust is soft or even stagnant, which is very likely to cause death. Or other diseases.