It is a large tropical large-scale economic fish that has a fast-growing, large individual, a mixed diet, a strong disease resistance, a high catch rate, a delicious meat, and a rich nutrition. Breeding advantages. The breed was first introduced into the county in 1998. From 2001 to 2004, our station successfully carried out high-yield aquaculture pond demonstration for freshwater ponds for four consecutive years in Lianyungang Cooperative Farm. The output per acre was maintained at about 1,000 kg, and the economic benefits were considerable.
First, pond conditions. The farm is located in the northern part of the suburbs, close to the branch of a river near the Shijiu River, away from factories and residents living area, adequate water sources, excellent water quality, water and drainage system separated, without any pollution sources around. The breeding pond is rectangular, extending east to west, with an area of ​​0.57 hectares, a water depth of 1.5-2 meters, a flat bottom, a slope ratio of 1:2.5-3, and a 3 kW impeller-type aerator.
Second, the pond preparation. Every winter, the pond must be dry and exposed, and clear lime should be used for quick-drying around April 15 of the second year. Dry ponds, fresh lime consumption of 75 kg per mu; wet clear pond, lime consumption of 150 kg per mu. Ten to 15 days before stocking, the pond water depth should be adjusted to 1.2-1.3 meters and aerators should be installed.
Third, seed stocking
1, stocking time. Freshwater pelicans, a tropical fish, have poor resistance to low temperatures. Only when the water temperature is maintained above 20-22°C can the fingerlings be released. General stocking time is mid-May and must not be later than the end of May. It is best to choose sunny noon when stocking.
2, seed sources. The fish species stocked are from the Tianbang Fisheries Research Institute of Xiangquan Town, He County. The fish species cultivated using the hot spring resources are robust and well-proportioned.
3, stocking quantity and specifications. Due to the many breeding advantages of freshwater pelicans and the superior pond conditions, we are putting in a standard of 1200 tails per acre. For convenience and morning market, stocking specifications are 12-15/kg. Before stocking, soak in 3–5% sodium chloride solution for 5–8 minutes and hold in a pond for 2-3 hours. In addition, in order to improve the water quality of ponds, 100 species of squid species with a size of 6-10 tails/kilogram will be placed at a ratio of 6:1 per acre.
Fourth, feed feeding
1, fixed point. That is, the fixed feed feeding site is convenient for both freshwater and whitefish to eat, and it is also convenient for the staff to check the fish's eating and drinking conditions.
2, qualitative. That is, feeds with mildewed feeds are not fed. Feed types include: wheat, soybeans, rice bran, animal carcasses, waste from slaughterhouses, and special compound feeds. In the case of moldy feeds, they should be stopped immediately. For rotten animal feed, feeding frequency and feeding amount should be reduced. Otherwise it affects the quality of adult fish. We mainly choose wheat, black soybeans and special compound feeds in production to ensure that the crude protein content in feeds is ≥ 25%.
3, timing. Feeding was conducted 4 times a day, which was 9 o'clock, 11 o'clock, 14 o'clock and 16 o'clock respectively. At 9 o'clock and 14 o'clock, freshwater white peony pellet feed was fed, and 11 o'clock and 16 o'clock were fed with a mixture of wheat and black soybean.
4, quantitative. When feeding, the amount of feed should be determined based on the growth rate, growing season, and weather of the freshwater fish. The body weight of the fish was measured every 10-15 days, and the feed rate and feed amount were determined according to the weather temperature. In general, during the growth period of freshwater ferrets, the initial feeding rate is 3-4%, the medium-term 4-6%, and the late 7-8%.
V. Daily management
1, water quality management. In order to ensure the fresh water quality of the breeding ponds, it is usually 15-20 cm per 15 days or so. During the high temperature period of July-August, at least 10 cm of water should be added every 5-10 days.
2, patrol pond. Its purpose is to observe the fish's eating and feeding conditions, activities, and pond water quality. We must insist on doing a good job of patrolling the pond every morning, and carefully observe the activities of the fish. The high temperature of the noon, the weather is hot and rainy, it is necessary to tighten the patrol pond. If there is any abnormality, take appropriate measures in time.
3, disease prevention and treatment. As a kind of fish with strong disease resistance, freshwater whitefish is not susceptible to diseases. In the breeding process, the following prevention work should be focused on.
(1) Prevention of Bacterial Diseases: Quicklime should be splashed at a dose of 15-20 mg/kg in a timely manner to improve water quality and prevent bacterial diseases.
(2) floating head Pan Tang: Every morning and noon in sunny summer days, aerators should be opened in a timely manner to increase the amount of dissolved oxygen in the water to prevent floating heads from occurring.
6. The key to the high-yield technology of freshwater and whitefish is when the fish is stocked. The specifications of the fish should not be too small, and the specifications should strive to be consistent and not excessively large. It is even more important not to deliberately consider a variety of fish species in order to consider future rounds of catching and listing. Keep the same pond.
Second, freshwater whitefish are omnivorous demersal fish. When the main animals are raised, the ponds must not be stocked with other demersal fish, otherwise it will affect the yield per mu.
Third, freshwater white storks are generally stocked in mid-May, and the water temperature remains stable at 20-22°C. Premature stocking, unstable temperature, easy to affect the survival rate; too late, it will affect the growth rate, is not conducive to the morning market.
Fourth, fresh water and white fleas have a large amount of food and have a bad taste. When feeding, it must be done according to four methods. In production, we found that freshwater white storks eat and die.
First, pond conditions. The farm is located in the northern part of the suburbs, close to the branch of a river near the Shijiu River, away from factories and residents living area, adequate water sources, excellent water quality, water and drainage system separated, without any pollution sources around. The breeding pond is rectangular, extending east to west, with an area of ​​0.57 hectares, a water depth of 1.5-2 meters, a flat bottom, a slope ratio of 1:2.5-3, and a 3 kW impeller-type aerator.
Second, the pond preparation. Every winter, the pond must be dry and exposed, and clear lime should be used for quick-drying around April 15 of the second year. Dry ponds, fresh lime consumption of 75 kg per mu; wet clear pond, lime consumption of 150 kg per mu. Ten to 15 days before stocking, the pond water depth should be adjusted to 1.2-1.3 meters and aerators should be installed.
Third, seed stocking
1, stocking time. Freshwater pelicans, a tropical fish, have poor resistance to low temperatures. Only when the water temperature is maintained above 20-22°C can the fingerlings be released. General stocking time is mid-May and must not be later than the end of May. It is best to choose sunny noon when stocking.
2, seed sources. The fish species stocked are from the Tianbang Fisheries Research Institute of Xiangquan Town, He County. The fish species cultivated using the hot spring resources are robust and well-proportioned.
3, stocking quantity and specifications. Due to the many breeding advantages of freshwater pelicans and the superior pond conditions, we are putting in a standard of 1200 tails per acre. For convenience and morning market, stocking specifications are 12-15/kg. Before stocking, soak in 3–5% sodium chloride solution for 5–8 minutes and hold in a pond for 2-3 hours. In addition, in order to improve the water quality of ponds, 100 species of squid species with a size of 6-10 tails/kilogram will be placed at a ratio of 6:1 per acre.
Fourth, feed feeding
1, fixed point. That is, the fixed feed feeding site is convenient for both freshwater and whitefish to eat, and it is also convenient for the staff to check the fish's eating and drinking conditions.
2, qualitative. That is, feeds with mildewed feeds are not fed. Feed types include: wheat, soybeans, rice bran, animal carcasses, waste from slaughterhouses, and special compound feeds. In the case of moldy feeds, they should be stopped immediately. For rotten animal feed, feeding frequency and feeding amount should be reduced. Otherwise it affects the quality of adult fish. We mainly choose wheat, black soybeans and special compound feeds in production to ensure that the crude protein content in feeds is ≥ 25%.
3, timing. Feeding was conducted 4 times a day, which was 9 o'clock, 11 o'clock, 14 o'clock and 16 o'clock respectively. At 9 o'clock and 14 o'clock, freshwater white peony pellet feed was fed, and 11 o'clock and 16 o'clock were fed with a mixture of wheat and black soybean.
4, quantitative. When feeding, the amount of feed should be determined based on the growth rate, growing season, and weather of the freshwater fish. The body weight of the fish was measured every 10-15 days, and the feed rate and feed amount were determined according to the weather temperature. In general, during the growth period of freshwater ferrets, the initial feeding rate is 3-4%, the medium-term 4-6%, and the late 7-8%.
V. Daily management
1, water quality management. In order to ensure the fresh water quality of the breeding ponds, it is usually 15-20 cm per 15 days or so. During the high temperature period of July-August, at least 10 cm of water should be added every 5-10 days.
2, patrol pond. Its purpose is to observe the fish's eating and feeding conditions, activities, and pond water quality. We must insist on doing a good job of patrolling the pond every morning, and carefully observe the activities of the fish. The high temperature of the noon, the weather is hot and rainy, it is necessary to tighten the patrol pond. If there is any abnormality, take appropriate measures in time.
3, disease prevention and treatment. As a kind of fish with strong disease resistance, freshwater whitefish is not susceptible to diseases. In the breeding process, the following prevention work should be focused on.
(1) Prevention of Bacterial Diseases: Quicklime should be splashed at a dose of 15-20 mg/kg in a timely manner to improve water quality and prevent bacterial diseases.
(2) floating head Pan Tang: Every morning and noon in sunny summer days, aerators should be opened in a timely manner to increase the amount of dissolved oxygen in the water to prevent floating heads from occurring.
6. The key to the high-yield technology of freshwater and whitefish is when the fish is stocked. The specifications of the fish should not be too small, and the specifications should strive to be consistent and not excessively large. It is even more important not to deliberately consider a variety of fish species in order to consider future rounds of catching and listing. Keep the same pond.
Second, freshwater whitefish are omnivorous demersal fish. When the main animals are raised, the ponds must not be stocked with other demersal fish, otherwise it will affect the yield per mu.
Third, freshwater white storks are generally stocked in mid-May, and the water temperature remains stable at 20-22°C. Premature stocking, unstable temperature, easy to affect the survival rate; too late, it will affect the growth rate, is not conducive to the morning market.
Fourth, fresh water and white fleas have a large amount of food and have a bad taste. When feeding, it must be done according to four methods. In production, we found that freshwater white storks eat and die.
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