Summer is the golden season for fish growth, so scientific management of ponds is also particularly important. In summer, the water temperature is higher, the reproduction of pathogens is accelerated, and the growth and metabolism of fishes are enhanced. As a result, the possibility of fish diseases increases, and the spread of infection increases. Therefore, the summer pond fish farming should start with the following five aspects.
First, fertilization
Summer is the period with the largest amount of feed, and it is also a time when fish grows vigorously and consumes large amounts of oxygen. Organic fertilizers are not advocated but inorganic fertilizers should be used to reduce the pollution to pool water. The specific fertilization amount is determined according to the pool water, water quality, weather conditions, etc. The transparency of the pool water is generally kept at about 25 cm, and the water color is tea brown, green brown, yellow green, and oil blue. Fertilization time is generally selected sunny morning Quanchiposa. Due to the increase of nitrogen content in summer water, it is recommended to use water-soluble phosphate fertilizer during fertilization. Generally, calcium phosphate is applied 2~3 times per month, and the dosage is 5~6 kg per acre. Usually, after 3 to 5 days of application of phosphate fertilizer, the phytoplankton in the pond will have a peak and the ammonia nitrogen content will drop. At this time, according to the water quality management requirements, new water should be added to prevent the water from becoming too concentrated.
Second, adjust the water quality
Regularly adding new water can bring in nutrients such as iron, manganese and silicon that are lacking in oxygen and water. It can also dilute the organic matter in the pool water and the toxic substances in animal metabolism, thereby restoring the balance of ingredients contained in the pool water. General fish ponds should be filled with fresh water 3-4 times a month, about 30 cm each time.
Third, feeding
It is better to feed 80% satiety in summer, if it is put in too much, because the water temperature is higher, the residual bait will cause the water quality to deteriorate quickly, and the pathogens will multiply and cause a variety of fish diseases. If fish eat too much, they are also susceptible to enteritis. The specific feeding amount should be flexibly controlled according to weather, water temperature, water quality, and fish feeding conditions.
Fourth, anti-floating head
The anti-floating head must be grounded on a patrol pond. Look for floating heads before and after the dawn. Check the fish's feeding situation in the afternoon and check the weather and the signs of floating heads at the sunset. Anti-floating head should maintain good water quality. Reduce the storage of fish in ponds. For those fish ponds that often suffer from severe floating heads, a part of the market should be captured in time. If the water quality of the pond is high, the plankton breeding is excessive, and it is necessary to use drugs to kill some of the water and reduce the consumption of dissolved oxygen in the water. Fish floating head rescue method: 1. Immediately inject new water, increase the oxygen content of water. 2. Start aeration machine oxygenation, stop feeding fertilizer. 3. Use 10 kg of yellow mud per acre and 20 kg of salt, add water to mix and splash the whole pool, or 2.5 kg of quicklime powder, add water to make a slurry, and sprinkle the entire pool with first aid.
Fifth, prevention and treatment of fish diseases.
Summer is the season of fish disease, so we must do a good job of prevention and treatment of fish diseases.
1. Disinfection: Including the pre-disinfection of fish ponds, disinfection of fish species before stocking, and disinfection of water bodies.
2. Operate meticulously in fishing, transportation, stocking and other activities to prevent fish injuries.
3. Find fish diseases and take effective measures to perform symptomatic treatment in time. The order of medication should be correct. In general, insecticide should be followed by insecticide.
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