NY/T 5069-2002 Technical specification for pond culture of eel for pollution-free food
Some standard content:
ICS65.150
Agricultural Industry Standard of the People's Republic of China
NY/T5069—2002
Replaces NY/T5069-2001
Pollution-free Food
Issued on 2002-07-25
Technical Specifications for Pond Culture of Eels
Implemented on 2002-09-01
Issued by the Ministry of Agriculture of the People's Republic of China
NY/T5069-2002
This standard amends the contents of some chapters and articles in Appendix A of NY/T5069-2001 "Pollution-free Food Standard". This standard was proposed by the Ministry of Agriculture of the People's Republic of China.
Technical Specifications for Pond Culture of Eels". During the revision, the original standard was deleted. The drafting unit of this standard is the Pearl River Fisheries Research Institute of the Chinese Academy of Fishery Sciences. The main drafters of this standard are Huang Zhanghan and Lu Maixin. The previous versions of the standards replaced by this standard are: NY/T5069--2001. 144
1 ScopebzxZ.net
Pollution-free food
Technical specification for pond culture of crab
NY/T 5069--2002
This standard specifies the production index and feeding cycle, environmental conditions, stocking mode, feeding method and mechanical equipment of pond culture. This standard is applicable to crab pond culture.
2 Normative references
The clauses in the following documents become the clauses recommended by this standard through the use of this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB/T9956 Quality standard for black carp fry and fingerlings GB/T11777 Quality standard for silver carp fry and fish germplasm GB/T 11778 NY5051 Pollution-free food Water quality for freshwater aquaculture Pollution-free food Guidelines for the use of fishery drugs NY 5071 NY5072 Pollution-free food Safety limit of fishery compound feed SC 1004 Eel compound feed SC/T1008 Technical specification for conventional pond fish fry and fingerling breeding Specification for the use of feed drug additives [Announcement of the Ministry of Agriculture of the People's Republic of China (2001) No. [168]] 3 Production indicators and feeding cycle See Table 1 for production indicators, commodity specifications and simple feeding cycle. Table 1 Production index, commodity specifications and feeding cycle Stocking specifications/(tails/kg)
500800
500-800
4 Environmental conditions
4.1 Pond
Feeding period/month
Commodity specifications/(tails/kg)
Expected production/(kg/ha)
7500~10500
12 000~~15 000
Eel seed pond Each pond has an area of 0.35ha~0.50ha, and a water depth of 1.2m-~1.5m. Mature pond Each pond has an area of 0.5ha~1.0ha, and a water depth of 1.5m~2.0m. The thickness of the silt at the bottom of the pond is about 10cm, with a slope ratio of 1, 1.5~2. 4.2 Water source
The water source is sufficient, the water quality is fresh, the irrigation and drainage are convenient, and the inlet and outlet are separated. 4.3 Water quality of the pond wall
4.3.1 Main physical factor indicators
See Table 2 for the main physical factor indicators.
NY/T 5069.-2002
Feeding season
April~October
November~March of the following year
4.3.2 Main chemical factor indicators
See Table 3 for the main chemical factor indicators.
17. 0~8. 5
Dissolved oxygen/(mx/1)）
4~11
4.3.3 Main biological factor indicators
See Table 4 for the main biological factors.
Main physical factor indicators
Transparency/cm
Water temperature/（
Table 3 Main chemical factor indicators
Ammonium nitrogen/（mg/L）Hydrogen sulfide/（mg/1.）0～~2
Table 4 Main biological factors
Dominant species and biomass of phytoplankton/（mg/L）Biomass of zooplankton/（mg/L）Chlamydomonas, Suspension spherical algae, Chlorella vulgaris, biomass 2545
4.3.4 Other physical and chemical factors
Other physical and chemical factors should comply with the provisions of NY5051. 5 Stocking model
Green (green bean) color
Chemical oxygen demand (COD)/(mz/L)
Biomass of benthic animals/(mg/L)
5.1 Pond cleaning
Pond cleaning methods and cleaning medicine dosage should comply with the provisions of SC/T1008. Requirements for pests
Prevent snakes, water birds and ferocious
fish from harming the fish
5.2 Quality of eels
The eels to be stocked are white eels that are fed artificial compound feed. They should be of uniform size, healthy and disease-free, and active in swimming. 5.3 Stocking time
Large-sized eels can be stocked all year round. Black eels with a size of 500/kg to 800/kg are stocked from late March to June each year. 5.4 Grading and stocking density
For large-scale farms, eels weighing 500 to 800 kg are raised into edible eels weighing more than 400 g/eel. The grading method and stocking density of eel ponds of different levels are shown in Table 5. Table 5 Grading and stocking density of eels raised in ponds Pond level Free-range specification/(lip/kg) Out-of-pond specification/(/kg) Stocking density/(tail/ha) Number of days of feeding/d500800
225 000~195 000
105000~135000
45 000--75 000
22 500~30000
For the sub-tanks with a weight of 100 fish/kg,
the rest will continue to be raised in the original tank
For the sub-tanks with a weight of 25 fish/kg35 fish/kg
the rest will continue to be raised in the original tank
For the sub-tanks with a weight of 7 fish/kg~ 10 tails/kg
, the remaining original ponds continue to be copper-raised
to reach the market specifications and be put on the market in batches
5.5 Pond city area matching
In the year of stocking eel species, the proportion of the four levels of pond area for black eels (500 tails/kg~800 tails/kg), young eels (100 tails/kg), ball eels (25 tails/kg35 tails/kg) and adult eels is 1:1:3:5. The following year, as the eels continue to grow and are put on the market, all kinds of ponds are transformed into adult ponds.
6 Feed management
6.1 Feed
6.1.1 The feed used should comply with the provisions of NY5072 and SC1004. 6.1.2 The drugs added to the feed should comply with the provisions of the "Specifications for the Use of Feed Drug Additives". 6.2 Copper feeding
NY/T5069—2002
When the water temperature reaches above 12°C, it is necessary to feed every day. When the water temperature is between 12°C and 22°C, feed once a day at 2-3 pm. When the water temperature is above 23°C, feed twice a day at 6-8 am and 4-6 pm. The feeding amount should be flexibly controlled according to the different growth stages and seasons of eels. In the stage of young eels and middle eels, the feeding amount accounts for 6%-8% of body weight, and in the stage of adult eels, the feeding amount accounts for 2%~~4% of body weight.
6.3 Water quality adjustment
6.3.1 Physical adjustment
Common physical adjustments are:
-flushing and water addition. From late autumn to early spring, the eel pond water is changed once a month, and the amount of water changed each time is 10% to 20% of the pond water; water is added twice a month in summer, and the amount of water added each time is 5% to 20% of the pond water; on the eve of a typhoon, in thunderstorms, and when the eel pond is lacking oxygen, the amount of water change can be increased.
Mechanical adjustment. The aerator is turned on at night and at noon, and the operation time at noon is 2h to 3h; on the eve of a typhoon, in thunderstorms, the operation time of the aerator can be appropriately extended.
6.3.2 Chemical adjustment
Common chemical adjustments include:
When the pH value of the pond water is below 7, quicklime can be sprinkled throughout the pond, with the amount used each time being 225kg/ha to 375kg/ha, until the pH value of the pond water is between 7.5 and 8.5.
When the water transparency of the pond is greater than 35cm in summer and greater than 30cm in winter, the amount of water change should be appropriately reduced or 5kg of compound fertilizer or 2kg of urea plus 3kg of compound fertilizer per hectare of water surface should be used for spraying throughout the pond to increase the biomass of phytoplankton in the pond water and improve the dissolved oxygen and water quality of the pond water.
6.3.3 Biological Regulation
Common biological regulation methods include:
Each pond should be stocked with 750 to 1,200 silver carp and bighead carp of 0.25kg to 0.5kg each to control the reproduction of "lake indigo". The quality of silver carp and bighead carp should comply with the provisions of GB/T11777 and GB/T11778; when there are a large number of benthic animals in the pond, 150 to 225 black carp of about 250g per hectare can be stocked. The quality of black carp should meet the requirements of GB/T9956; appropriately mix bottom-dwelling omnivorous fish to remove residual bait from the pond bottom and prevent water quality from deteriorating; when the eels grow to the specifications for leaving the pond as shown in Table 5, they should be caught and put on the market or raised in separate ponds to maintain a more suitable density to stabilize the water quality. 6.4 Daily Management
6.4.1 Pond Inspection
Once in the morning and afternoon. In the morning, observe the changes in pond water color, whether there are floating heads, eel diseases, etc., and check whether the pond foundation has leakage; in the afternoon, focus on observing the changes in pond water color, the fertility of the pond water, and the feeding of eels, and decide whether to flush, add water, or increase the time of the aerator according to the weather conditions.
6.4.2 Preventing eels from floating and flooding the pond
When the density of eels is high, there is a lot of silt at the bottom of the pond, or before a typhoon, when the storm causes a sharp convection of the upper and lower water layers, the pond water will be deprived of oxygen, causing eels to float. When the zooplankton in the pond reproduces in large numbers and the phytoplankton decreases sharply, eels will also float or flood the pond. Prevention methods should be handled according to the measures in 6.3.
6.4.3 Cleanliness and sanitation of the pond
NY/T50692002
During the breeding period, quicklime should be sprinkled throughout the pond once a month, with the dosage of 225kg/ha375kg/ha each time, to improve the water quality and keep the pond water clean and hygienic.
6.4.4 Prevention
Whenever eels are harvested and the pond is cleaned, the pond base should be thoroughly checked, snake and rat holes should be blocked, and repaired. In particular, the inlet and outlet should be thoroughly inspected to prevent the eel net from escaping.
6.5 Prevention and control of eel diseases
6.5.1 Adhere to the principle of "prevention first, prevention and control combined". 6.5.2 Thoroughly clean and disinfect the pond. Carefully operate to avoid fish injuries. Do not stock diseased eels in the pond. 6.5.3 The use of drugs to prevent and control eel diseases shall be carried out in accordance with the provisions of NY5071. 7 Mechanical equipment
Each 0.2ha~0.3ha pond is equipped with a waterwheel aerator. For ponds with a water depth of 2m or more, in addition to a waterwheel aerator, a 1.5kW impeller aerator should be added in the center of the pond; each 1.3ha~2.7ha pond is equipped with a 3kW axial flow pump for water addition and injection. If the head is too high, a centrifugal pump is required. According to 70% of the total power load of the pond, a standby power generation equipment is configured to prepare for power outage emergency.
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