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Ten strokes to improve the survival rate of fry
Seedling pool selection in Miaochi 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. Before raising fish fry for 10 days before stock raising, drain the pool water to remove weeds and dig excess 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 the fish fry carefully 1. In the hatching tank, stir the water into a swirl, and the fish fry 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. Xiatang 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, 2-3 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, they should choose to lay their seedlings 2-4 meters offshore. Density reasonably 80,000 - 100000 fry per mu. 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 of fish fry cultivation mainly to soy milk, 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. Rehabilitate water quality fish into the pool early, the water depth is controlled at 40-60 cm, after 7 days, every 2 days - 4 days water injection, each injection of 10 cm -15 cm, expand the fry growth space, keep the pool water "fat, live, Cool and 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. The patrol ponds were regularly observed every morning and evening, 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. During the fish disease prevention and control 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. Divided fish fry in a timely manner by 20 days -25 days of cultivation, grow to more than 3 cm, the pool should be promptly divided, reduce the density of the pool to promote the growth of summer flowers and summer flowers out of the pool specifications. 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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