Using Dianchi Lake to Breed Brassica Technology

Using Dianchi Lake to Breed Brassica Technology

Brazilian bran, also known as South American salmon, is a tropical fish and is native to the Paraná River system in southern Brazil. It has strong adaptability, fast growth, wide appetite, large individuals, and disease resistance. Strong, easy to catch, fresh and tender meat, and high economic value, in 1996 the Zhejiang Institute of Freshwater Fisheries introduced the fish fillets of Brazil, and after intensive cultivation, it was successfully reproduced artificially in China for the first time in June 1998. . It has been widely tested in Zhejiang, Guangdong, Guangxi, Fujian, Shanghai, Jiangsu, Sichuan, Hubei, Hunan, Shandong, Jiangxi, Anhui, Hainan, Henan, Tianjin, Beijing and Xinjiang.
Liangshan County, Shandong Province is located in the lower reaches of the Yellow River and there are many lotus ponds. In order to explore the effects of breeding Brazilian bran in lotus ponds, in 2000, the author carried out the experiment of breeding brazilian bran in 5 mu lotus ponds in the aquaculture farms of the county, and achieved good economic benefits. Now it is introduced as follows: Construction of lotus ponds And clear

1. It is better to use clay as the soil that is used for turning clay to make lotus root. The clay has good water retention properties. In April, it began to turn over earth to make earthworms. The depth of earth turning is about 0.5 meters, making a 1.5-meter-high pool dam with a crest width of about 0.8-1.0 meters. In the pond, excavation of "back" shape or "field" shaped gutters, the pond area is made into 1 mu/piece.

2. After fertilizing and mixing ponds are well-established, 2000 kg of livestock and poultry manure will be applied per acre, and water will be mixed and pooled after fertilizing evenly. To prevent leakage of dams.

Selection and cultivation of lotus root

The selected lotus seeds are fresh, no cuts, and no buds. Uniformly planted, with a spacing of 1.5 meters and a spacing of 1.0 meters. The amount of lotus planted per acre is 150-200 kilograms, the planting depth is generally 0.15-0.2 meters, and the breadhead should be compacted. Clear pond and fish stocking

1. In order to kill the pathogenic bacteria that may exist in the pond, Qingtang disinfects 100 kg of lime per acre before and after the cultivation of lotus root. 10-15 days after the disinfection can be released.

2. The species of brazilian carp, stocked by fingerling stocks, was purchased from the Zhejiang Institute of Freshwater Fisheries and its specifications were about 4 cm. Fish stocking is generally conducted 10-15 days after the lotus planting. Stocking density is 1000 tails/mu. Before stocking, fingerlings are usually washed with 10 mg/L potassium permanganate for 30 minutes to kill pathogens that may be carried on fish.

Feeding management

Feeding and Feeding Brazilian bran is a partial eclipse of plant-based omnivorous fish and is very bulimia. Under artificial rearing conditions, the feed sources are very wide, and rice bran, bean cakes, wheat husks, bean dregs, peanut cakes, rapeseed cakes, moringa, distiller's grains, and a small amount of fishmeal, silkworm pupa powder, etc. can be fed. Rice bran, bean cake, and wheat husk are mainly fed in the early stage of cultivation, and squid compound feed is mainly added in the later stage. Feeding amount should be fed according to the size of the fish body according to the size of the fish. Generally, the freshly-fed fishes will feed 5% to 7% of the fish body weight, and 3% to 5% of the fish's body weight at adult fish stage. Feeding. Feeding volume is generally adjusted once a week, increasing by 15% on the basis of last week. The body weight was measured once a month to readjust the feeding amount. Feeding is usually done twice a day, ie once a day at 8:00 am, 40% of the feed for the whole day, and once at 4 pm, feeding 60%. The feeding area generally accounts for 10% of the total area of ​​the entire pool.

2. Water quality regulation During the high-temperature season, the weather is changeable, and the water quality is easily changed. If the water is too thick, yellow, white, and black, indicating that water quality has started to deteriorate, new water should be added in time to regulate water quality. Through reasonable feeding and use of quicklime, timely adjustment of the pool's fatness. At the same time, in order to maintain the stability of water quality, such as the pool water is oil green, brown green, brown, brown and blue, water quality fat and cool, not cloudy, transparency 30 cm, you can not change the water or less water.

3, tongtang observation This is the most basic daily work, requiring three times a day tour. In the early morning, the patrol pond mainly observes the activities of the fish and whether there are floating heads. At noon, the patrol pond mainly inspects the fish's activities and eating conditions. At dusk, the patrol pond mainly checks whether there is any leftover feed and whether there are floating head omens. When the weather changes abruptly in the summer season, the fishes are prone to floating heads. At this time, the patrol ponds should be increased once in the middle of the night so that effective measures can be taken in time to prevent flooding.

4. Disease Prevention and Control The disease prevention and treatment in Brazil is an important part of the aquaculture process, especially in high-density aquaculture, so it is necessary to do a good job of preventing and curing diseases. Disease prevention and control should adhere to the principles of "disease-free prevention, early disease prevention, and prevention-based treatment." Precautionary measures In addition to routine work such as drug clearing ponds and fingerlings disinfection, special attention should be given to the improvement of water quality, no deterioration of feedstuffs, and regular drug prevention. Usually every 2 days Quanchiposa 2 mg / l furazolidone or oxytetracycline, while the daily selection of sulfa drugs, antibiotics (dimethazine, chloramphenicol, chlortetracycline, oxytetracycline, etc.) mixed feeding in the bait. In the breeding process, due to the proper prevention effect, there was no phenomenon that a large number of dead fish occurred due to illness.

test results

1. Production After more than four months of breeding, the Brazilian oysters were harvested on October 10, 2000. A total of 1,879 kilograms of brazilian bran was harvested. Before the Spring Festival, lotus roots in the pond were dug and 8200 kilograms of lotus root were obtained.

2. The economic benefit is 30 yuan/kg in Brazil, and 1.5 yuan/kg in wholesale price at lotus root. The total income is 56370+12300=68,670 yuan. After deducting the total expenditure of 39,250 yuan, the net income is 29,420 yuan, and the output is 13,734 yuan per mu. The net income was 5884 yuan, and the input-output ratio was 1:1.75, which achieved good economic benefits.

Summary and Experience

Brazil is a tropical fish, the optimum growth temperature is 26-32 °C. However, due to the rapid growth rate and short growth cycle of Brazilian cockroaches, commercial specifications can be achieved after more than four months of breeding. Most regions in China can meet their temperature requirements and can be cultured. Because of its high economic value, Brazilian bran has rapidly become a new type of cultured species and has been widely promoted throughout China.

The use of lotus root pond breeding Brazilian bran, lotus root can provide oxygen for the Brazilian bran, but also provide some of the bait; while lotus root can use bran manure and some of the bait can be used as fertilizer, purify the water quality, thus improving the Brazilian bran breeding environment, It is conducive to the growth of Brazilian cockroaches; and it reduces the risk of breeding and opens up a new way of breeding Brazilian cockroaches.

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