Artificial Breeding of Production Techniques of High-grade Alternary Juvenile Silver Trout

First, the seed cultivation (a) Pei Miao Tong fish pond area of ​​2-4 mu, depth of 12-15 meters, drainage and irrigation convenience, flat bottom, pond sturdy, no water leakage. (b) 7-10 days before the fish ponds are sterilized in the clear ponds, use lime or bleach or tea gluten. (3) Fertilizer water quality Five days before the fish seedlings in the pond, 200-300 kg of organic fertilizer is applied per acre as a base fertilizer, and deepen the pond water to 07 meters. When water is drained, filter it with a dense net to prevent wild fish and debris from entering the pond. (d) fry stocking 1, fish fry pond with a small amount of fish in advance to determine whether the pool water drug disappeared, and pull a net, clear pond eggs, turtles, debris. The temperature difference between the water temperature and the pond water in the container of the fish seedlings in the pond at the time of the lower pond does not exceed 5°C. After the long-distance transport of fish fry, the pond must first be placed in the pond water to float for a period of time, so that the water temperature in the bag is similar to the temperature of the pond water before the bag is opened. While adding the pond water, slowly pour the fish. Into the pond. 2, stocking density of 100,000 to 150,000 tailstock per mu. (V) Feeding and management 1. Feeding and fertilizing the fish After seeing the water in the pond, apply 20-30 kg of organic fertilizer per acre per day; or plow grass in Xiangyangtang, about 150 kg per mu, every 2-3 The grass is turned once a day. In the ten days after the fry, the soybeans were fed twice a day, three to four kilograms of soybeans were used per mu, and the soaked peanut bran was fed after ten days. The amount of feed was gradually increased according to the growth of the fry. 2. Inject the water every 7-10 days in stages, add 20-30 centimeters of water each time, and gradually increase the water depth to about 15 meters. 3. Strengthen management Observe the weather, water quality and fish activity every day to facilitate the control of feeding, fertilization, and fish disease, and promptly remove weeds, frog eggs, and fleas to increase the survival rate. (F) Fish fry ponds are reared for 20-25 days, and the total length is about 3 cm. After the nets are trained, they can go out of the pond for commercial fish breeding. If they are to be put into the ponds, reservoirs or large adult fish ponds (above 10 mu), they must be reared in ponds for 20-30 days so that large-scale fish species larger than 5-6 cm can be used. Stocking to ensure the survival rate of fingerlings. Second, adult fish breeding (A) farming methods 1, fish ponds into fish ponds into fish ponds in addition to the conventional implementation of carp, carp, grass carp, carp and other fish, the increase of stocking per acre high-type heterogenetic silver crucian 150 - 200 tails, appropriate feed some peanut bran, bean bran and other concentrates, feeding 6-8 months later, when individuals generally reach 300-500 grams before they catch up for listing. In the main turtles, squid, and frog ponds, 100-150 tails of mixed-breeding high-yield silver oysters per mu, do not need to increase feeding, but only after they are raised for more than 300 grams for 6-8 months, they are listed for sale. However, if the adult fish pond is used to raise bottom fish such as tilapia and squid, it is not possible to stock high-yield silver oysters. Because the high-type heterotrophic silver cockroaches are gentler and their food habits are similar to those of these fish, their growth rate and survival rate will be affected. 2. Into the main pond for fish ponds (1) Preparation of fishponds: The area is 3 to 10 acres, and the water depth is 2 meters or more. It is convenient for drainage and irrigation. There is 20-30 centimeters of silt at the bottom of the pond and the pond is strong. Before the fish species are stocked, 100-150 kilograms of lime (or 7-10 kilograms of bleach, or 50 kilograms of tea bran) shall be used for clearing poisonous ponds. Then apply basal fertilizer to fertilize the water quality. 300-500 kg of organic fertilizer or 10 kg of inorganic fertilizer (5 kg of nitrogen fertilizer and 5 kg of phosphate fertilizer) per mu. Fertilizer application time should be chosen from 9am to 11am on sunny days. (2) Stocking of fish species: All kinds of fish should count down the pond. Five to six centimeters of high-grade heterotrophic silver cocoon 1200-1500 tails are stocked per acre. With 50-80 tails per mu for stocking, 30-50 tails per mu, and 100-120 tails per mu, grass carp and carp are stocked for 2 to 3 batches each year. (3) Feeding and fertilizing: Feeding twice a day is performed in the afternoon and afternoon. The amount of daily feeding is 5%-7% of the fish's body weight, and it can be reduced to 2%-4% in the later period. The feed contains peanut bran, bean bran, etc. with a protein content of more than 30%. After the fish is under the pond, fertilizer is applied regularly to keep the water quality cool. 3, fish ponds raise the family of fish to raise the conventional density of fish, increase feeding 5-6 cm high-type heterotrophic silver cockroach 100-150 tail, feed feeding according to the conventional, do not increase the amount of feeding, after 5-8 Month rearing, with an average of more than 300 grams per individual, was launched. (b) daily management 1, feeding to achieve "timing, qualitative, quantitative, positioning." In the typhoon weather and rainy weather, feeds should be reduced as appropriate. 2. Apply topdressing fertilizer regularly. Apply 300 kg of organic fertilizer per acre for every 7-10 days or 8 kg of inorganic fertilizer (3 kg of urea and 5 kg of superphosphate). 3, water quality regulation to keep the water cool. In May-June and September-October, water is added once every 10 days, 20 centimeters each time, and water is added every 5-7 days in July-August, adding 30 centimeters each time. 4. Diligent patrol ponds. Observe the patrol ponds once in the morning and evening. Observe the fish activities and feeding conditions. Check whether the pond foundation is firm and whether the entrance and exit gates are safe. 5. Establish Tangtou records to record the weather conditions, the amount of feeding, the amount of fertilizers, and the medication situation, so as to summarize and improve.

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