Summer is the main season for growing farmed fish. As a result of increased material inputs to the fish ponds, higher water temperatures, increased metabolic capacity of fish, and the influence of climatic factors such as high temperature and drought, fish disease transmission and flooding occur, and the quality of water becomes The key to fish rearing in summer. Therefore, summer fish farming should first raise water and do a good job in the water quality management of fish ponds. 1, dredging transformation. Improving the pond's ecological environment is one of the technical measures to control water quality. The water in the pond is too fat. The consumption of large amounts of oxygen at high temperatures in the summer can easily lead to floating or flooding of the fish, and it is not easy to manage the net. Therefore, dredging must be carried out to remove excess silt from the pond and keep the silt thicker by 10-15 cm. 2, drug improvement. There are two main types of drugs that are suitable for improving water quality: First, quicklime. The quick release of quicklime to adjust the water quality can improve the pH of the water, reduce toxic gases, control the reproduction of pathogens, and prevent the occurrence of fish diseases. However, it is necessary to use a fresh piece of quicklime, the amount of which is 15-20kg per 667m2 when the depth of water is 1 meter, and the whole pool is splashed after plasm, generally once every 20-30 days; the second is the use of photosynthetic bacteria products. For aquaculture, the water quality can be increased to fat, live, tender, and cool, and it can reduce or reduce floating heads and flooding ponds, and it can prevent bacterial fish diseases and improve the fish's feeding and digestion ability and immune function. The use concentration is 510-6 for the first time, 310-6 for the future, once every 20 days, and the whole pool should be sprayed evenly. 3, open aerator. In the sunny day, noon, 2-3 hours 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, the boot time at noon shortened; Reduce the boot time when cool, increase the boot time at midnight floating head. 4, add new water. The injection of new water can increase the dissolved oxygen and nutrients, flush the organic matter and toxic substances in the fresh water pool, and restore the balance of the ingredients contained in the pool water. Generally, water or water is changed every 10-15 days. The amount of fresh water added to the water accounts for 1/3 of the pool water. If the pool water is seriously deteriorated, 1/3 of the pond water should be drained before injecting new water. The time for adding water should be sunny. It should be carried out before 2-3 o'clock in the afternoon. Water should not be added in the evening to avoid convection in the upper and lower water layers, causing the fish to lose oxygen. 5, stirring the bottom of the pond. The purpose is to loosen the sediment and mix the upper and lower aquifers to promote the decomposition of organic matter in the bottom of the pool, increase the source of fertilizer in the water, and release sediments, adsorbed nutrients and trace elements in the sediment to prevent the accumulation of harmful substances in the pool. Method of operation: 1 person under the pool with a long handle rake or stir directly with his feet; 2 on the shore as dragging the same rope as the drag network; 3 polyculture of the underlying fish. 4 Agitate or flip once in 1-2 weeks. Do it in sunny weather and windy conditions to avoid flooding. 6, control bait fertilizer. Summer is the peak season for fish to eat, so it is necessary to strengthen the feeding and let the fish 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 quality. 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 fertilizer. Generally, every 667m2 is topped with 200 kg of human excrement per day for 10 days, or 300 kg of green manure or 2 kg of urea. Fertilizer can be regulated in a ratio of 1:2 for nitrogen and phosphorus, and can be well regulated. Fish water quality.
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