At present, the Qilin District has entered the summer high temperature and rainy period. At this stage, aquaculture tends to occur in hypoxia and floating heads. Attention must be paid to the floating heads of fish when the following situations occur.
1, due to the temperature difference between the upper and lower water temperature caused by rapid convection caused floating head such as summer daylight, high temperature, the upper water produces a lot of dissolved oxygen, while the lower layer produces a lot of oxygen debt, due to water resistance, upper and lower layer is not easy convection, early evening Afterwards, the surface water temperature dropped drastically (such as thunderstorms, northerly winds, etc.), resulting in a density flow that caused convection of the upper and lower aquifers, temporarily increasing the amount of dissolved oxygen in the lower layers, but was quickly consumed by reducing materials in the lower layers of the water to repay the oxygen debt. . However, when the amount of dissolved oxygen in the upper layer is reduced, no supplement can be obtained. As a result, the dissolved oxygen in the entire pond rapidly drops, resulting in a floating head. This may be accompanied by the rise of poisonous reducing substances and hydrogen sulfide from the bottom, causing pond fish to float.
2, due to lack of photosynthesis, the lack of dissolved oxygen in the water caused by the floating head in summer if the case of continuous rain, or fog, poor lighting conditions, phytoplankton photosynthesis intensity is weak, the amount of dissolved oxygen in the water, less, and the pool of each The respiration of organisms and the decomposition of organic matter require the consumption of large amounts of oxygen to cause the dissolved oxygen in the water to exceed the supply, thereby causing the fish to float.
3, due to a large number of zooplankton breeding float head spring rotifers or maggots to reproduce, they heavily filter phytoplankton, make the water turn clear, lack of oxygen due to photosynthesis oxygen production, and zooplankton respiration greatly increased, Pool water is mainly supplemented with oxygen by air incorporation, and it is far from meeting the need for oxygen consumption, causing fish to float.
4, floating head due to water quality is too fat or corrupted. Floating head due to the long sunny and not rain this year, the pool water temperature is high, coupled with a large number of feeding fertilizer, pool water is very fat, oxygen consumption, such as long-term no fresh water injection, easily lead to water quality too fat Or corrupted, causing floating heads.
5. If it is predicted that a floating head may occur, the corresponding measures should be taken immediately to increase the dissolved oxygen in the pool. If it is found that the water quality is too fat, new water should be added in a timely manner to improve transparency, improve water quality, and increase dissolved oxygen.
6. During the summer weather forecast, there are thunderstorms in the evening, then you can start the aerator at noon. Reduce the oxygen difference between the upper and lower water layers and repay the underlying oxygen debts as soon as possible.
7. When it is estimated that fish may float, fertilization should be stopped and feeding should be controlled. The water quality is strong, but the weather is normal. The feed should be eaten before dusk and eat no night food.
8. When the weather is not normal, feeds should be stopped or eaten less. The forage that has been dropped should also be removed to prevent floating heads and water injection when the fish floats.
1, due to the temperature difference between the upper and lower water temperature caused by rapid convection caused floating head such as summer daylight, high temperature, the upper water produces a lot of dissolved oxygen, while the lower layer produces a lot of oxygen debt, due to water resistance, upper and lower layer is not easy convection, early evening Afterwards, the surface water temperature dropped drastically (such as thunderstorms, northerly winds, etc.), resulting in a density flow that caused convection of the upper and lower aquifers, temporarily increasing the amount of dissolved oxygen in the lower layers, but was quickly consumed by reducing materials in the lower layers of the water to repay the oxygen debt. . However, when the amount of dissolved oxygen in the upper layer is reduced, no supplement can be obtained. As a result, the dissolved oxygen in the entire pond rapidly drops, resulting in a floating head. This may be accompanied by the rise of poisonous reducing substances and hydrogen sulfide from the bottom, causing pond fish to float.
2, due to lack of photosynthesis, the lack of dissolved oxygen in the water caused by the floating head in summer if the case of continuous rain, or fog, poor lighting conditions, phytoplankton photosynthesis intensity is weak, the amount of dissolved oxygen in the water, less, and the pool of each The respiration of organisms and the decomposition of organic matter require the consumption of large amounts of oxygen to cause the dissolved oxygen in the water to exceed the supply, thereby causing the fish to float.
3, due to a large number of zooplankton breeding float head spring rotifers or maggots to reproduce, they heavily filter phytoplankton, make the water turn clear, lack of oxygen due to photosynthesis oxygen production, and zooplankton respiration greatly increased, Pool water is mainly supplemented with oxygen by air incorporation, and it is far from meeting the need for oxygen consumption, causing fish to float.
4, floating head due to water quality is too fat or corrupted. Floating head due to the long sunny and not rain this year, the pool water temperature is high, coupled with a large number of feeding fertilizer, pool water is very fat, oxygen consumption, such as long-term no fresh water injection, easily lead to water quality too fat Or corrupted, causing floating heads.
5. If it is predicted that a floating head may occur, the corresponding measures should be taken immediately to increase the dissolved oxygen in the pool. If it is found that the water quality is too fat, new water should be added in a timely manner to improve transparency, improve water quality, and increase dissolved oxygen.
6. During the summer weather forecast, there are thunderstorms in the evening, then you can start the aerator at noon. Reduce the oxygen difference between the upper and lower water layers and repay the underlying oxygen debts as soon as possible.
7. When it is estimated that fish may float, fertilization should be stopped and feeding should be controlled. The water quality is strong, but the weather is normal. The feed should be eaten before dusk and eat no night food.
8. When the weather is not normal, feeds should be stopped or eaten less. The forage that has been dropped should also be removed to prevent floating heads and water injection when the fish floats.
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