Fish always have certain signs in front of floating heads. Grasping these laws will help prevent floating heads and reduce economic losses.
1. Forecast based on the weather forecast and the weather conditions of the day: In summer, when it is overcast, low pressure, weak wind, heavy fog and other adverse weather, floating weather may occur in the early morning when the evening weather turns cloudy, thunderstorm showers or water quality is too fat.
2. Forecasting according to the characteristics of the season: Under normal circumstances, the water temperature in spring and summer will gradually increase, the food intake of fish will gradually increase, the water quality will gradually turn fat, and the storage of pond fish will be large. In case of sudden changes in weather, it is prone to floating heads. . In the continuous rainy weather in summer, the light intensity is weak, and the photosynthesis of phytoplankton is not strong, and floating heads are most likely to occur. In autumn, adult fish have reached commercial specifications, and there are large amounts of adult fish in ponds and water quality fertilizers. Although the temperature is decreasing day by day, the amount of oxygen consumed in pond water is increasing, and floating weather is prone to occur with slight changes in weather.
3. Prediction based on water quality: In summer, the concentration of plankton in the water body is large. In case of abrupt changes in the weather, especially if the temperature suddenly drops sharply, it will easily cause a large number of deaths of plankton and the water quality will suddenly become clear. At this time, water oxygen consumption factor With rapid increase, serious floating heads and flooding ponds often occur.
4. According to the fish's feeding situation, it is predicted that if there are few fish feeding during feeding, no food is consumed, and no fish disease is found, it can be concluded that the water quality of the fish pond is not good, and the dissolved oxygen in the water body is low. This phenomenon is generally more pronounced when the first meal is given in the morning; if the last meal in the afternoon is also the case, there is a high probability that the head will float early at night and should be noticed.
It can be judged by observing the feeding conditions of grass carp. Under normal conditions, grass carp usually feeds in the food field and can only see the grass piles being tossed or the grass being dragged to the surface. If the grass carp eats on the side of the haystack, or even swims around the grass, this is also a sign of low oxygen in the pond. In this case, the floating head is prone to occur.
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