Non-polluted aquaculture technology of Chinese sturgeon in greenhouse

In recent years, the Chinese sturgeon breeding in Jinhua City, Zhejiang Province has developed very rapidly. At present, the number of farmed fish in the city has exceeded 15 million, and the output is over 6,000 tons. The output value has reached over 300 million yuan. Chinese sturgeon breeding has become a characteristic pillar industry of Jinhua fishery. Although greenhouse farming is characterized by low product quality and frequent use of drugs, it has been criticized by many people in the industry. However, the greenhouse cultivation cycle is short, the production cost is low, and the market is widely sold. This breeding mode still has a strong vitality. Greenhouse cultivation now accounts for more than 80% of the city's sturgeon culture, and it is growing rapidly. This also benefits from the promotion of pollution-free healthy breeding techniques of Chinese sturgeon in greenhouse cultivation. Moreover, as long as strict compliance with the requirements of pollution-free breeding in breeding, is strictly prohibited the use of illicit drugs, scientific and rational use of input products, so that the product meets the pollution-free standard requirements, the market should accept the Chinese sturgeon products of greenhouse cultivation. In recent years, the price of greenhouse Chinese sturgeon has also shown a rise. Here is a summary of the non-environmental pollution cultivation technology of Chinese sturgeon in Jinhua City as follows:
Environmental conditions breeding base must comply with the provisions of GB/T 18407.4. It is quiet and well-watered, and there are no sources of pollution nearby. Aquaculture water must comply with NY5051 regulations.
Design and construction of greenhouses and aquaculture ponds The construction of greenhouses should comply with relevant building management regulations, have good thermal insulation properties, and be equipped with appropriate heating, aeration, and drainage and other equipment. General 10,000 square meters supporting 3 sets of 0.5 tons of boilers, 2.2 kilowatts of oxygen aerators 10, pellet feed 2 sets, 150 cubic meters of heating pool, management of auxiliary room 200 square meters and other facilities.
Aquaculture pond construction should meet the requirements of living habits of Chinese sturgeon. The size of Dianchi Lake is uniform, each area is 15m2 to 20m2, pool height is 0.6m, and the top of the pool wall stretches inwards from 8cm to 10cm to prevent flight. The feed table is made up of 3 meters long and 0.5 meters wide board or cement prefabricated board, submerged under water 15 centimeters. A net bag is set in the pool for concealment of Chinese sturgeon. The mesh bag is made up of 3 layers and 4 layers without knotted mesh. It is square, 40 centimeters long, and the net bag is diagonally suspended, with a spacing of 20 centimeters, a nesting distance of 15 centimeters, and a net pocket of 10 centimeters to 15 centimeters from the bottom of the pool. The exposed surface is 5 cm to 10 cm.
Selection and hatching of quail eggs Selection of eggs weighing 3 g to 5 g, white light (animals) occupy 1/3 to 1/2 of the surface of the eggs, clear outlines, pale yellow or light red plants, egg surface luster, No spotted fertilized eggs.
Place the incubator box with quail eggs in neatly stacked into the hatchery room, heat the infrared lamp, control the temperature of the hatchery room at 30°C~31°C, control the air humidity at 85%, and control the humidity of the sand at 8~12. %. After 40 days to 45 days, the quail eggs hatched.
The hatching process should be well-watered, ventilated, up-and-down, and predator control.
Rinse and rinse the fish before stocking, and use fresh lime 150 mg/L to 200 mg/L or bleach 10 mg/L for disinfection.
Choose no injury, no defects, and vigorous childishness. The specifications of the same childish pool should be neat, with specifications greater than 3g. The juveniles before stocking were bathed with potassium permanganate 20 mg/l for 20 minutes. The sterilized juvenile can be placed in a 2% slurry water that has been fortified with a larval opening for about 1 hour. When stocking, gently place the boxes or baskets containing the sterilizers into the water so that the worms can climb out and swim in the water. 35 to 40 animals per square meter of water are stocked.
Feed management feeds shall comply with the juvenile feed formulated in NY5072 and SC/T1047. Feed additives shall comply with the provisions of the “Regulations on the Administration of Feed and Feed Additives” of the State Council [Decision No. 266] of the State Council.
It is forbidden to add hormones and artificial colors. Daily feeding is 5% to 8% of carcass weight. Feed pellets were made into soft pellets using a pellet mill before feeding, and the pellets were put on the feed table at regular intervals. The pellets were injected 3 times a day and once every 8 hours.
Day-to-day management conducts a patrol pool inspection half an hour after feeding, and controls the feeding situation of the cockroach to adjust the feeding amount; check the anti-escape facilities; observe the behavior of cockroaches; if any abnormality is found, it shall be promptly handled; Objects; timely removal of residual feed, cleaning the feed table; view the water color, the amount of water temperature, smell the smell, do a good job in breeding logs.
The water quality management changes the water according to the situation of the water color in time, generally change the water once a month, change 1/3 each time. The pool water should be controlled to be slightly alkaline. The transparency of the water body should be 25 cm to 35 cm. The water color is yellowish green or dark brown. After changing the water, each pool is evenly sprayed with compound microbial preparations to regulate water quality.
Disease prevention and control The greenhouse cultivation has a high degree of intensification and a high density of cultivation. Therefore, it is easy to breed pathogens and cause diseases. Therefore, strict prevention and control of diseases are required for greenhouse cultivation. However, in the prevention and control process, strict implementation of "NY5071-2002 pollution-free food and fishery drugs use guidelines" and "NY5070-2002 pollution-free food aquatic products in fishery residues limit" implementation. We must adhere to the principle of "comprehensive prevention and active treatment" and emphasize the principle of "prevention from treatment and prevention and control", promote ecological comprehensive prevention and control, use biological agents, and use Chinese herbal medicines as much as possible to prevent and control diseases and insect pests.
Application of healthy breeding techniques, appropriate control of the culture density, enzyme added probiotics, vitamins, etc. in the feed to promote the digestion and absorption of nutrients, improve the ecological environment of aquaculture water. If abnormal growth is observed, use 0.3 ppm to 0.5 ppm Povidone Iodine for Quanchiposa, or 1 ppm glutaraldehyde for Quanchiposa.
The use of fishery drugs must strictly comply with the relevant regulations of the State Council and the Ministry of Agriculture and prohibit the use of fishery medicines that have not obtained production licenses, approval numbers, and product implementation standards; the use of prohibited drugs is strictly prohibited. After the use of fishery drugs, it is necessary to strictly implement the withdrawal period.
Each batch of Chinese sturgeon harvested is harvested twice. When 35% of the Chinese sturgeon reached the 0.35 kg specification, the first fishing was performed, and 0.35 kg of the Chinese sturgeon was caught on the market. Two months after the first fishing, the second fishing was performed, and all the remaining Chinese sturgeons in the pool were captured and listed.
The pollution-free culture of the postscript is not only technically pollution-free, but also implements the management philosophy of pollution-free standardization in aquaculture management, and establishes a quality control system that focuses on the management of input products such as seedlings, feed, and fishery medicine, and The "three records" and other standardized management records are the core quality management systems, so as to ensure the application and implementation of pollution-free aquaculture technology.

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