1, organic fertilizer feeding method
Generally, basal fertilizer is applied 7 days before the fry go into the pond to breed natural bait organisms for the fry to eat. After the fry enter the pond, the amount of topdressing is determined according to the water quality and fertility, the weather, the water temperature and the growth of the fry. Generally, the fertilizer is applied 1 time every day, and the whole pond is evenly sprinkled after adding water for pulping.
Four days after the fry enter the pond, if the fry float in the morning, they will return to normal after sunrise, indicating that the water fertility in the pond is moderate; If the head still floats after 8 am on a sunny day, it means that the water quality is too fat, and the amount of topdressing should be stopped or reduced; If the head does not float and the water color is light, the amount of topdressing should be increased.
2, cake powder feeding method
Grinding cottonseed cake, rapeseed cake or soybean cake into dry powder to feed fish. The advantage of this method is that that fee can be processed centrally and it is convenient to use. At the same time, the dry powder is evenly sprinkled on the water surface. With the help of the surface tension of water, the dry powder floats in the pool water for a longer time and has a higher utilization rate than soybean milk. It is fed three times a day.
3. Fertilizer feeding method
Before the fry go into the pond 15 days, apply base fertilizer first; After the fry go into the pond, the amount of topdressing should be determined according to the water quality, weather and the growth of the fry. Ammonium sulfate and calcium superphosphate should be topdressing every three days. When topdressing, the fertilizer should be dissolved in water and sprinkled evenly in the whole pond to prevent the fry from swallowing fertilizer particles by mistake and dying.
4, straw pulp feeding method
Processing aquatic plants such as water hyacinth, water peanut and duckweed into straw pulp to raise fry can reduce production cost. When in use, the whole pool is splashed, twice a day, depending on the water surface. The fry can directly eat some straw pulp particles, and the rest is decomposed in water, which plays a role in fertilizing water.
5, soybean milk feeding method
Generally, soybean milk is fed half a day after the fry go into the pond. First, the soybeans are soaked in water at a water temperature of about 25℃ for 6 hours. If the time is too long or insufficient, the quality of soybean milk will be affected. Generally, 1 kg soybean can be ground 15 kg soybean milk.
The ground soybean milk should be sprinkled on the water surface in time and evenly. Every morning and afternoon 1 time, 2 kilograms of soybean milk should be fed per mu of water surface every day within the day when the fry are in the pond 10. After 10, the feeding amount should be increased as appropriate according to the water color and fish growth, and generally 1 10,000 summer flowers should be raised.
Skills of fry quality identification
At present, most of the fry sold in the market are artificially propagated. Due to the influence of egg quality and hatching environment, the fry physique is different, which directly affects the later survival and growth. Therefore, farmers can distinguish the advantages and disadvantages according to the appearance, swimming ability and reaction ability of fry when purchasing.