1. Causes of flooding in pools Causes pooling of fish in ponds to require a water-soluble oxygen concentration of 5 mg/l or more in order to survive safely and grow to 2 mg/l to 3 mg/l. , After less than 2 mg/l, it will seriously float the head, and when the floating head time is too long, it will flood the pond. Therefore, it will lack oxygen. First, the temperature difference in the water layer below the pool, the formation of convection surface lack of oxygen; Second, lack of light, phytoplankton photosynthesis oxygen decreased and lack of oxygen; Third, sudden changes in the weather and sludge consumption of oxygen in the pool bottom Hypoxia.
Second, forecasting method
1. Look at the weather forecast There are thunderstorms, abrupt changes in temperature, and floating heads in the evening. Floating heads will cause pans. After a day's south-easterly winds, the northwesterly winds will turn into floating heads at night. Overhead rainy days, small winds, low air pressure, and floating heads will appear. The weather is not raining and the water quality is strong. Once it turns fine, it will float, and it will flood the pond for a long time.
2, look at the color of the water forecast rich, low transparency, oxygen consumption, will float head; lower water-soluble oxygen, the upper layer of water-soluble oxygen can not be added to the lower water will float head.
3, look at feeding prediction 2 hours to 3 hours after feeding, not eating is not normal. If there is no disease, it shows that there is less dissolved oxygen in the water and it will float in the morning. When watching at night, if there are wild fish around the pond or the shrimps surface to the surface, it means that the fish in the pool floats; at the windward side of the pond, the fish will hear the sound of people walking, and they will be surprised to drill into the water, indicating that the head has floated, and vice versa.
Third, judging by floating heads before dawn, only to see the white catfish floating in the head, will immediately fall after hearing the alarm sounds of people; it is a frivolous head; after two o'clock in the middle of the night, in addition to flower heads, grass and squid The floating head, who hears that the alarming sound cannot sink, is a heavier floating head. At this time, it is necessary to prepare for rescue. It is predicted that it will cause flooding; at around midnight, except for the white pelicans and grass carp floating heads, the squid floats and listens. When the alarm sounds do not sink, it is a serious floating head. At this time, if the body color of grass carp has not changed, there is still time to rescue, such as grass carp due to lack of oxygen for a long time, body color has turned yellow, then flooding pond has caused, in addition to fish floating on the surface, most have sunk to the bottom of the water to death, that is Flooding the consequences of the pond.
IV. Measures to save pan-tang Once you start to form a pan-tang, you should turn on the oxygen immediately, and it is not until the next day that the sun stops. The oxygenation of the medicine can be relieved within 30 minutes. There are many varieties of drugs that can be used as described. If there is no time to rescue, after flooding the ponds, in addition to salvaging the fish floating on the water, use nets to catch fish sinking into the water, otherwise the fish will stink on the second day and can not eat, and the loss is even greater.
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