First, strengthen feed feeding
The specific number and frequency of feedings per day depends on the speed of feeding, shrimp, crabs, weather, water temperature, and other conditions. From the point of view of food intake, the average fish is within 0.5 to 1 hour, shrimp and crab are suitable for eating within 1 to 2 hours, and the feeding time of green feed can be appropriately extended. The number of feedings per day is appropriate twice, in the morning and afternoon. When the weather is fine and the dissolved oxygen in the water is high, feed more; when the weather is hot or raining, and when the water quality deteriorates, the oxygen content of the water drops, the appetite of fish, shrimp and crabs decreases, and the feeding rate slows down. Stop eating. Feed must be fresh.
Second, rational fertilization
In order to maintain a certain degree of fatness, ponds mainly composed of fertilized fish such as cockroach, cockroach and tilapia should be maintained. The specific amount of fertilization should be based on transparency, weather, water color, and water quality. The transparency is preferably 25 to 30 cm; the water color is yellowish green, greenish brown and dark brown. If the weather is clear, fertilization may be appropriately increased. Otherwise, fertilization should be stopped. Specific fertilization should be carried out in accordance with the principle of “few timesâ€. When the water temperature is low, some organic fertilizers may be added. When the water temperature is high, in order to prevent the increase of oxygen consumption, some inorganic fertilizers may be added. Generally, 5 to 7 days are used once.
Third, strengthen water quality management
Frequently adding new water, constantly raising the water level, shrimp and crab ponds to raise the water level to 1.5 meters or more, and the high-yielding fish pond water level should be deepened to more than 2 meters. The old water in the pool should be replaced regularly and new water should be replenished timely. Generally 5 to 7 days for a water, first row after the increase, a change of 10 to 15 cm. When the water quality deteriorates, it is necessary to increase the amount of water to be changed, and one-fourth to one-third of the water can be changed at a time Remove residual feed and other contaminants from fish, shrimp, and crab left in ponds. Every day depends on the weather, water quality and other conditions in a timely manner to increase the oxygen aerator, if you encounter showers or hot weather, you should extend the boot oxygen time. At the same time, quicklime can be applied once every 15 to 20 days. In shrimp and crab ponds, photosynthetic bacteria or EM bacteria are preferably applied once every 15 to 20 days.
Fourth, pay attention to disease prevention
August is the high incidence of fish, shrimp and crab diseases. A variety of bacterial, viral and parasitic diseases can occur. Inadequate preventive measures may also cause widespread epidemics. The disease is mainly prevention. The main measure is to regularly disinfect the body of water, usually 15 to 20 days to disinfect it once. Use chlorine dioxide, dibromohydantoin, bleach powder or quicklime for regular disinfection of water bodies to prevent the occurrence of diseases. At the same time, vitamin C, immune polysaccharides, and viral additives should be added to the feed regularly. To seek accurate diagnosis of diseases, select high-quality, high-efficiency, low-toxic drugs, timely and accurate medication.
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