Summer is the main season for fish growth. As a result of increased feed input, increased water temperature, and increased fish metabolism in farmed fish ponds, summer fish ponds are prone to fish disease transmission and flooding. Therefore, summer fish farming must first raise water. The quality of water quality is the key to success or failure of fish rearing in summer. Drug improvement There are two main types of drugs that are suitable for improving water quality: First, quicklime. The quick release of lime to adjust the water quality can not only regulate the pH of the water body, reduce the toxic gases, but also inhibit the reproduction of the bacteria and prevent the occurrence of fish diseases. However, it is necessary to use a fresh piece of quicklime, the amount of which is 15 to 20 kilograms per mu when the water depth is 1 meter, and the whole pool is splashed after the slurry, generally 20 to 30 days. The second is the use of photosynthetic bacteria products. Photosynthetic bacteria can be used in aquaculture to make the water quality of the water body reach fat, live, tender and cool. It can reduce and reduce the phenomenon of floating heads and pans, and can prevent bacterial fish diseases and improve the fish's feeding and digesting ability and immune function. . Use it once every 20 days. When using it, it should splash evenly in the whole pool. Open aerator in the sunny afternoon 2 ~ 3 pm to adjust the water quality, in order to promote water convection, increase the pool dissolved oxygen and emit toxic gases; continuous high temperature and rainy days boot, do not boot in the evening; the weather is hot and boot time can be extended, noon boot The time is shortened; the boot time is shortened when the weather is cool, and the boot time is extended in the middle of the night. Adding new water and new water can increase dissolved oxygen and nutrients in the water, flush organic matter and toxic substances in the fresh water pool, and restore the balance of ingredients contained in the pool water. Usually, water or water is changed once every 10 to 15 days. Each time new water is added, it accounts for 1/3 of the total pool water. If the pool water is seriously deteriorated, it should be discharged 1/3 and then injected with new water. The time for adding water should be selected before 2 to 3 o'clock in the sunny afternoon. It is forbidden to add water in the evening so as to avoid causing convection in the upper and lower layers and causing the fish to lose oxygen. The purpose of the mixing pond bottom is to loosen the bottom mud and mix the upper and lower aquifers to promote the decomposition of organic matter in the bottom of the pool, increase the fat source in the water, and release sediments and adsorbed nutrients and trace elements in the sediment to prevent harmful substances in the pool. accumulation. Method of operation: 1 person under the pool with long handle tweezers or stir directly with his feet. 2 Pull the ropes on the shore like pulling a net. 3 polyculture of ground fish. 1 to 2 weeks of agitation or rolling, should be carried out when the weather is clear and windy, so as to avoid flooding the pool. The control of bait fertilizer is a season for fish growth in summer. Therefore, it is necessary to strengthen feeding and allow fish to eat well. The amount of fish fed should be sufficient within 2 hours. Do not allow excess food, otherwise it will waste food and pollute the water body. In addition, according to the thinning condition of the pool water, a small amount of chase fertilizer material. Top dressing types include manure, green manure and chemical fertilizers. Generally, 200 kg of manure urine or 300 kg of green manure or 2 kg of urea are applied every 10 days for each mu. Fertilizer can be applied in a ratio of 1:2 for nitrogen and phosphorus to maintain good quality. Water quality.
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