Thoroughly clear the fry before laying the seedlings for 10 days before stocking to drain the ground water, remove the weeds, and dig up excessive silt. Use 1500 kg of quicklime to convert the whole pond into water to kill bacteria and strange insects. Predators. When entering the water, the inlet should be filtered with a double-layer dense net to prevent wild fish from entering the pond. After the fish pond is filled with water, it is necessary to regularly inspect the pond every morning. If frog eggs and aquatic plants are found, they must be promptly removed. Fry pond selection area of ​​20 square meters to 30 square meters. The water depth is from 1m to 1.5m. The pool embankment is solid and does not leak water. The water source is sufficient. The water injection and drainage are convenient. The fish pond should be leeward and sunny, rectangular and east-west direction. The fry pool should not be too large and the water body should not be too deep. If it is too large, it is easy to form wind waves, fish fry will collide with the wall of the pool with wind and waves, which will reduce the survival rate; if it is too deep, it will be difficult to increase the water temperature. If the area is too small, the water temperature changes quickly and it is difficult to control the living conditions of the fry. Scientifically selecting the quality of fry fry directly affects the survival rate of fry. The methods to identify the quality of fish fry are: 1. In the hatching tank, the water body is stirred into a swirl, and the fry can march against the water at the edge of the swirl to be a good seedling. 2. Take a small amount of fry into the dish, the fry lively and lively, the body is clean, the mouth blows the water surface, and the fry can swim against the water. After the water is drained, the fry is left to struggle at the bottom of the pan, and the head and tail are bent to form a circle. Raising fish fry points 1. "Test water" after the pond: the day before fry release, take a few fish fry on the fish net cage, observed one day, if the fish activity is normal, you can put seedlings. 2. Fertilizer ponds: Zooplankton (rotifers) in fertilizer and water ponds are at the peak of their breeding season. After the fry pools, there are plenty of natural foods that can increase the survival rate of fry. Generally, organic fertilizer is applied at a rate of 200 kg to 300 kg per 667 square meters of water. After the fish pond is fertilized for 6 days to 7 days, rotifer breeding reaches a peak period. At this time, fry can be used as a pond. If the water temperature is low, the pool may be postponed for 2 days to 3 days. 3. Feed the pond: Before the pond, put the fry into a slightly larger plastic basin. Take 2-3 egg yolks per 10,000 fry. Dilute the yolk smash with water. Filter through a 40 mesh polyethylene mesh cloth. Sprinkle evenly in the basin and put it in the pool after 20 minutes. 4. Temperature regulation under the pond: When the fry is transported to the pond mouth. Note that the temperature difference between the oxygen bag and the fish pond cannot exceed 3°C. If the temperature difference is too large, the oxygen bag should be placed on the surface of the fish pond. When the water temperature in the bag approaches the temperature of the fish pond, the fry is slowly placed in the pool. In case of storms, the upper hand should be placed 2m to 4m offshore. In order to cultivate fish fry reasonably, only one species should be placed in one pool, and it is not suitable for polyculture. 80,000 to 100,000 fish fry per 667m2 are stocked. Density is too low, can not fully use the water body and bait; high density, easy to cause floating head of the fry, or due to lack of food to reduce the growth rate of fry. Cast enough feed, timely fertilization of fish fry to feed soy milk, supplemented by fertilization. Sprinkle the milk a few times and spread it evenly. The bait should be "three times and two full ponds" (that is, three times a day, three times a day, including two full-time splashes and one splash around the fish). Is splashing, can not be put on hold too long, every day 667 square meters of water taken from 3 kg to 4 kg of soybeans, grinding feed. After 5 days, in addition to the pulp, it is necessary to add extra concentrates such as bean dregs and bean cake paste. Fertilization can increase the nutrient elements of water, and promote the growth and reproduction of natural food organisms. When the water quality of the fish pond is light and the natural food is not enough, it is necessary to top-dress fertilizer in time. Generally, 5 days after the fish enters the pond, fertilizer is applied once every 2 to 4 days, and 80 kg to 100 kg of organic fertilizer is applied every 667 square meters of water. Adjusting water quality In the early stage of the fish entering the pond, the water depth is controlled at 41 cm to 60 cm, which is conducive to raising the water temperature and promoting the growth and reproduction of food organisms. After 7 days, fill the water every 2 days to 4 days. Each injection of water is 10 cm to 15 cm deep. Water injection should pay attention to the flow of water into the pool straight, the water injection time can not be too long, so as not to prolong the flow of fish, consume physical strength, affecting growth or triggering the racehorse disease. The patrol ponds will be patrolled once a day, and the water quality and turtle activity and growth will be observed to determine the amount of feeding and the amount of fertilizer to be applied. Diseases should be promptly treated and cleared of dead fish. Timely pond fry is cultivated from 20 days to 25 days. When it grows to more than 3 cm, it should be divided into pools in time to reduce the rearing density, promote the growth of summer flowers, and increase the summer flower outlet specifications. Before the summer flower goes out, it takes 2 days to 3 days to pull the net to exercise. Before pulling the net, it is necessary to stop for 1 day. The operation should be light and the speed should be slow. Do fish disease prevention and treatment work fry summer flower stage, the main fish diseases are horse disease, white head white mouth disease, white skin disease. During the incubation period, lime water is splashed once every 5 days to 7 days. Every time 667 square meters of water is used, 15 kg of lime is used to clarify the water body and prevent fish diseases. When the racehorse disease occurs, the rams can be used to cut off the fry mad swimming route, stop the water injection, and increase the amount of feeding and fertilizer appropriately. When whitehead white mouth disease and white skin disease occur, 1 g/m3 of bleaching powder or 0.2 g/m3 of strong chlorine fines may be used to splash the ground and disinfect the floor water for 2 days.
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