The water in the fish pond is light, the dissolved oxygen in the water is high, and the fish is not prone to hypoxic floating head phenomenon; the water quality is rich, the fish bait has many creatures and grows fast, but the oxygen-depleted floating head often occurs at night, and even there is the risk of pan fish being dead. . Therefore, artificial measures should be adopted to regulate fertilizers and regulate dissolved oxygen. The criteria for good water quality are: fat, live, tender and cool. The water quality regulation measures for the fish ponds are introduced throughout the year as follows:
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First, the four seasons of fertilization (organic fertilizer) to regulate the quality of water organic fertilizer produced by the decomposition of a large number of nutrients, is conducive to the proliferation of plankton, to provide a rich feed for fish.
1. Winter base fat enough. In winter, the water temperature is low, the dissolved oxygen is high, and the oxygen consumption is low. At this time, a large amount of basal fertilizer is applied. After long-term decomposition, there will be no drastic decrease of oxygen. When water temperature rises in the spring, the water quality turns strong, and feed organisms in the pond water will multiply, which is beneficial to the growth of fish. The method is more than a small amount, the amount of fertilizer is about 40% of the whole year, and generally about 750 kilograms per acre pond.
2. Spring fertilizer supplement. From March to May, plankton has been massively propagated, and fish consumption has increased significantly. It is about to enter the peak of plankton breeding. At this time, fertilization materials should be added. The methods are many times, accounting for about 25% to 30% of the total amount. .
3. Summer fertilizer control. From June to August, it is in the high temperature season, which is the period with the largest amount of feed. The amount of oxygen consumption is large, and high-yield ponds are generally not fertilized. The water quality is indeed lighter, and the amount of fertilization is much less, and the amount of fertilizer is about 10% of the total amount.
4. Autumn fertilizer. September-October, when the autumn season is high, the amount of bait has been gradually reduced, this time should be less than a few, to ensure that the fish grow fat later, the amount of fertilizer accounts for about 20% to 25% of the total amount of fertilizer.
When applying organic fertilizer, it must be done before the fermentation. Organic fertilizers are generally used in early spring and late autumn. Summer hot season should always be followed by chemical fertilizers. Fertilizer fish on the one hand can be fat and water, promote the growth and reproduction of plankton, is conducive to the growth of whitefish; on the other hand can provide fish with a high dissolved oxygen, low oxygen consumption of a good ecological environment, to prevent fish floating head in the summer is very good Effect. Application of "a small number of times" as a principle, generally once every 5 to 7 days, each time 5 kg of ammonium bicarbonate, 5 kg of phosphate fertilizer. If there are more silt in old ponds, less nitrogen fertilizer should be used and more phosphate fertilizer should be applied. If ponds with small amount of ponds or organic fertilizers are newly opened, more nitrogen fertilizer should be used and less phosphate fertilizer should be applied.
Second, the four seasons of water injection regulation of water quality Adding new water can bring oxygen and some of the lack of nutrients in pool water, accelerate biological metabolism and increase the activity space of fish.
1. The water depth in winter is about 1 meter when it is planted in shallow winter. The water is easy to be fat and the water temperature is easy to rise.
2. In spring, the water level is gradually increased from 2 to 2.5 meters in March to June.
3. Although summer plus ground summer is close to the highest water level, in order to adjust the water quality, a new water is added every 5 to 7 days, each time adding 15 to 25 centimeters of water. Water is best when water is added at 2 or 3 pm at noon. At this time, flushing can promote convection on the water in the pool and bring the surface high dissolved oxygen water into the lower layer. The surface water is then saturated by the photosynthesis of phytoplankton and increases. The amount of dissolved oxygen reduces and avoids floating fish heads and increases the utilization of feed.
4. In the autumn and fall of water, from September to October, the water level in the rivers will drop, and the stocks will be large. To ensure that fish have ample space and stable water quality, it is necessary to add water to maintain the water level.
Author: Yifeng Town Fisheries Station, Yandu District, Yancheng City, Jiangsu Province