Seedling pool selection
The fry pool requires a solid dike, no water leakage, adequate water supply, and easy injection and drainage. The pond should be leeward, rectangular, and east-west. The fry pool should not be too large, the water body should not be too deep, too large and easy to form wind waves, fish fry collision with the pool wall, affect the survival rate; too deep, the water temperature is difficult to increase. The area is too small, the water temperature changes quickly, and the living conditions of the fry are difficult to control.
Pre-cleaning pond
Ten days before stocking, the fry was drained and the weeds were removed to remove excessive silt. After each block of 1500 kg of quicklime water, the whole pool is splashed to kill germs, parasites and enemy pests. When entering the water, the inlet should be filtered with a double-layer dense net to prevent wild fish from entering the pool. Discover frog eggs and aquatic plants and remove them promptly.
Choose fish carefully
1. In the hatching tank, the water body is stirred into a swirl, and the fry can swim against the water at the edge of the vortex as a good seedling.
2. Take a small amount of fry into the dish, the fish are active and clean, the body is clean, the mouth is blown to the surface, and the fry can swim against the water. After the water is drained, the fry is left struggling vigorously at the bottom of the pan, and the head and tail are bent into loops as good seedlings.
Under the pond preparation
1. "Test water" after the pond. One day before stocking, take a few fish fry in the fish pond cage and observe for one day. If the fish activity is normal, you can put the seedlings.
2. Fertilizer pond. Fertilizer pond standard is that the zooplankton (rotifer) is in the peak of breeding season. After the fish is put into the pool, there is a natural food with plenty of palatable ingredients. After 6 days to 7 days of fertilization in the general fish pond, rotifer breeding reaches a peak period, so the fertilization time should be 7 days to 8 days before the fish pond. If the water temperature is low, it can be 2 days to 3 days ahead of schedule, 200 kg -300 kg of organic fertilizer per acre.
3. Feed the pond. When the fry were in the pond, two to three yolks were fed per 10,000 fry. The method is to put the fry into a slightly larger plastic basin, dilute the egg yolk with water, filter it through a 40-mesh polyethylene net cloth, and evenly sprinkle it in the basin. Wait another 20 minutes and put it in the pool.
4. Adjust the temperature of the pond. When the fish is transported to the pool mouth, note that the temperature of the oxygen bag and the fish pond can not be different by 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, slowly put the fry into the pool. . In case of storms, the upper hand should be placed 2m to 4m offshore.
Reasonable density
80,000 to 100,000 fish fry per acre. Density is too low to make full use of water bodies and bait. If the density is too high, the floating head of the fry can be easily caused during the cultivation process, or the growth of the fry can be inhibited due to insufficient feed.
Timely fertilization
Fry cultivation is mainly based on soy milk feeding, supplemented by fertilization. The amount of soymilk spilled was more than a few times, and evenly spilled. Every day, the bait should be “three times and two full ponds†(that is, 3 times for 1 day, 2 of which is less than the whole pond splash, and 1 is splashed around the pond). Soymilk should be freshly ground and must not be put on hold for too long. Every day, 3kg - 4kg of soybeans per acre are required. After 5 days, in addition to the pulp, additional bean curd, bean cake paste and other fine ingredients are required.
When the water in the fish pond is light and the natural food is not enough, it is timely to top-dress. General fish fry 5 days into the pool, every 2 days - 4 days topdressing 1 times, each time organic fertilizer applied per acre 80 kg -100 kg, to ensure that the fish pond has a certain natural food organisms for fish feeding.
Rebalancing water quality
When the fry enters the pool, the water depth is controlled between 40 cm and 60 cm. After 7 days, water is injected every 2 days to 4 days. Each time 10 cm to 15 cm is injected, the fry growth space is enlarged, and the pool water is kept “fat, live, and coolâ€. Tender." Water injection should pay attention to the water flowing into the pool straight, the water injection time can not be too long, so as not to prolong the flow of fish and consume physical strength.
Time patrol
Each morning and evening, the patrol ponds were observed once and the water quality was observed to determine the amount of feeding and the amount of fertilizer applied. Observe the activity and growth of the fish and find that the disease is treated and cleared in time.
Fish Disease Prevention
During the incubation period, lime water is splashed once every 5 days to 7 days, and 15 kg of lime are used per acre to clarify the water quality and prevent fish diseases. When the racehorse disease is onset, it is possible to cut off the fry mad swimming route and stop the water injection, and increase the amount of feeding and fertilizer appropriately. When whitehead white beetle disease and white skin disease occur, 1 g/m3 of bleaching powder or 0.2 g/m3 of strong chlorine is sprayed in the whole pool per acre to disinfect the pool water for 2 days, and the pool is divided in time to reduce the density in the pool.
Timely pooling
The 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 density in the pool to promote the growth of summer flowers and improve the specification of summer flowering ponds. Before the summer flowers go out of the pool, 2 days to 3 days of net exercise are required. To stop eating for 1 day before pulling the net, the operation should be light and the speed should be slow.
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