The pond area is suitable for 1-3 mu. 10-15 days before entering the pond, the fry is sterilized by the dry clear pond and uses 75-100 kg of lime per acre. The pond is filled with water 0.5-0.6 meters deep, and the water injected into the pond must be strictly filtered with a 60-mesh sieve. The fry hatched out of the membrane for 3-4 days, and the fry stocking density was 5-150,000 tails per mu. Quanchi splash soy milk, soybeans with 3-5 kilograms of water per acre. Day-to-day management is the same as summer fish breeding methods for common fish such as eel, grass, and grass carp. After 20-30 days of cultivation, when the size of the big white fish reaches 2-3 cm, it is kept in separate ponds.
Fish breeding
In Heilongjiang Province, large whitefish fingerlings have to be cultivated for 2 years. In the first year, one-year old fingerlings are cultivated, and in the second year, two-year old fingerlings are cultivated.
(1) Pond conditions and preparation: The pond area is suitable for 3-4 mu and the depth of the pond is 2-3 meters. 10 days before entering the pond, the fish species will be disinfected with dry ponds. Each pond has 75-100 kg of quicklime or 5-10 kg of bleaching powder. Each mu of fermented fermented manure 200-300 kg. Pond water 0.6-0.8 m deep.
(2) Fish species stocking
Incubation of 11-year-old fish species: From late April to early May, 0.8 to 10,000 tail fish species are 2-3 cm per mu. From late May to early June, 800-1000 tails of squid Wucai with 1.5-2 cm in size per mu, and the ratio between squid is 2:1-3:1.
22-year-old fish species cultivation: From late April to early May, the stock of 8-10 cm large white fish per acre stocking size 3000-4000. From late May to early June, carp carp was stocked again, and the ratio between stocking and carp was the same as that of 1 year old fish breeding.
(3) Feeding management
One-year-old fish species: Feed fresh fish or formulated feed. If you are feeding fresh fish, fresh fish will be twisted into fish gizzards and sprinkled in the whole pool. Feed it once a day and feed it at 9am. The daily feeding rate is 5%-15%. If the compound feed is fed, the fish body will start to feed when it reaches 3.5 centimeters, and the compound feed will be made into small soft pellets at the beginning, and gradually transition to feeding dry hard pellet feed. The crude protein content of the compound feed should reach More than 40%.
2nd-age fish species: 15cm before feeding the fish, whole pool sprinkled. Feed it once a day and feed it at 9am. Daily feeding rate is 3%-8%. After 15 centimeters, chopped wild fish were fed and a feed stand was set around the pond. Feed 2 times a day, and feed each at 9 and 15:00. Daily feeding rate is 5% -10%. Can also be fed formula feed, feed crude protein content requirements of 38% -40%.
(4) Daily management: First, adjust the water quality, diligently fill water, and keep the depth of water 1.5 meters in summer. The second is the patrol pool, pay attention to observe the fish activities and eating conditions, and find that abnormalities are dealt with promptly. The third is to do a good job of prevention and treatment of fish diseases. Feeds to be fed should be fresh. Sprinkle the dibromohydantoin once every 15 days and disinfect the pool water. Use 0.1 g per cubic meter of water.
Adult fish culture
1 pond conditions: the pond area is suitable for 5-15 acres, the pool depth of 2-3 meters, the bottom of the pool is flat, the bottom sludge thickness does not exceed 20 cm. The pond is easy to inject and drain, and the water source is sufficient. The water is fresh and pollution-free. It is best to have a small amount of plants in the pond, but also to plant a small amount of plants. The pond is equipped with a 3-kilowatt impeller aerator.
2 Preparation before stocking: First, clear pond disinfection, 15 to 20 days before the fish stocking, dry clear pond disinfection, use 75-100 kg of lime per acre or bleach 5-10 kg. Clear pond disinfection 4-5 days, the pond water injection 50-60 cm. The second is fertilization. Before the fish species are stocked for 7-10 days, 100-200 kilograms of fermented manure is applied per acre pond to cultivate zooplankton and other bait organisms. The third is to set up the feed station, take 1-2 feed stations in the pond, and feed the area of ​​3-4 square meters, set in the middle of the water body.
3 Stocking of fish species: Stocking fish species from mid-April to early May. The stocking species require uniform specifications, robust physique, and no disease or injury. Before the fish enters the pool, the fish body is sterilized with saline solution with a concentration of 30 g/l, and the time is 10-15 minutes. Large white fish into the general plan of mu yield 200-300 kg. Fish stocking specifications are determined based on the fish market specifications for the local market. If the market demand for commercial fish size is 350-500 grams, 500-800 tails of 30-80 grams of large white fish are stocked per acre. If the market demand for commercial fish is more than 1,000 grams, 200-300 tail fish species will be 350-500 grams per acre. In addition, 800-1000 squid per acre stocking size of 200 grams or more, 40-50 squid of 200 gram or more.
4 Feeding management: Feeds can be fed in the following three categories: First, live bait fish, sized from 1/5 to 1/4 of the body length of large whitefish, preferably equipped with live bait fish ponds to ensure a steady supply of bait fish. Live bait fish can choose low-value fish such as squid fish, wheat ear fish, squid, and squid. The second is fresh fish, which needs to be minced or chopped and then fed. The third is compound feed, requiring the feed crude protein content of 35% -40%, feed particle size of 2-3 mm. The compound feed can be processed into sinking pellet feed or extruded floating pellet feed. The use of artificial compound feeds to replace fresh fish with less leftover bait can reduce the pollution of water bodies, protect the pond water environment, improve the quality of commercial fish, and can also reduce feed costs.
Live bait fish are generally fed 5-7 days. The amount of live fish is 1-2 times that of big white fish in ponds. For example, the size of the large white fish species that are fed with fresh fish is 30-80 g. One month before feeding, the fresh fish is first twisted into fish after the fish is fed, fed 2 to 3 times a day, and fed daily. The rate is 8% - 10%. One month later, fresh fish were chopped and fed into fish. The size of the stocked large white fish species is 350-500 grams, and fresh fish can be cut into sections for feeding. Feed 2 times a day, the daily feeding rate was 2% -8%. The compound feed was fed twice a day, each time feeding, and the daily feeding rate was 0.5%-5%. It is advisable that the amount of fish fed each time is within 2 hours of fish consumption, and the amount of each feed of compound feed should be within 1 hour of the fish. According to the fish's food, activities and weather conditions, the amount of feeding can be flexibly controlled.
The live bait fish can be directly put into the pool, and the bait fish can be separated from the water for a few minutes before feeding, so that the bait fish can slow down after entering the water, so as to facilitate the hunting of the whitefish. The minced fish gizzards began to be sprinkled on the whole pond, and then the feeding range was gradually reduced to attract large whitefish to the feed table for feeding. The chopped fish is put on the feed table and fed to the fish. It can also be directly sent to the pool water. Subsidiary pellet feed can be fed at a fixed time, and domestication and feeding methods can be adopted. The method is the same as that of carp. Extruded buoyant pellet feeds should be selected at the upper winds, and the determined feed amount can be directly poured into the pool water. It should be noted that during feeding, fresh fish can not be fed at the same time with compound feed. Generally, fresh fish are fed in the early stage and compound feed is fed in the later stage. In addition, black light can be set on the surface of the pond during the summer to attract insects to feed fish, and lights can be turned on in the middle of the night.
The feed coefficient of live bait fish and fresh fish is generally 4-6, and the feed coefficient of compound feed is generally about 2.
5 Water quality regulation: After the fish species enters the pond, fresh water should be added every 7-10 days, and the water depth should reach 1.5-2 meters in July to supplement the water supply and maintain the water depth. If water quality is found to be aging, change the water. In July-August, lime water is splashed every 15-20 days, and 10-15 kilograms of quick lime are used per acre of water. Every day in the summer, aerators are opened for 1-2 hours. In addition, photosynthetic bacteria can also be used to regulate water quality.
6 daily management: First, a daily tour pool, pay attention to observe the fish activity, eating conditions, weather and water changes. Check fish growth regularly. Remove dead fish, leftover baits, and other debris in a timely manner. The second is to strengthen the prevention and treatment of fish diseases, feeds should be fed fresh. Before the fish enters the pool, the fish body is soaked with 1% salt water for 10-15 minutes. Found fish disease, timely symptomatic treatment. Third, the white fish are violent and easy to lose scales. Care should be taken when stocking and pulling nets.
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