NY/T 5155-2002 Technical specification for the cultivation of pollution-free food Omi oysters
Some standard content:
ICS65.150
Agricultural Industry Standard of the People's Republic of China
NY/T5155—2002
Pollution-free Food
Published on July 25, 2002
Technical Specification for Aquaculture of Crassostrea gigas
Implemented on September 1, 2002
Ministry of Agriculture of the People's Republic of China
NY/T5155-2002
This standard is proposed by the Ministry of Agriculture of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Aquatic Products Standardization. The drafting unit of this standard is: Guangxi Zhuang Autonomous Region Ocean Research Institute.
The main drafters of this standard are: Yan Bing, Liang Guangyao, Tong Wanping, Yang Jialin, Lan Guobao, Du Xiaodong, and Wang Aimin. 198
1 Scope
Technical Specifications for Harmless Food Crassostrea Gould Cultivation NY /T 5155---2002
This standard specifies the technical requirements for the collection of seedlings, seed quality and cultivation of Crassostrea Gould under the environmental conditions of pollution-free cultivation.
This standard is applicable to the semi-artificial collection of seedlings and hanging cultivation of Crassostrea Gould, and can also be used as a reference for the cultivation of tidal flats. 2 Normative References
The clauses in the following documents become the clauses recommended by this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB3097
Seawater quality standard
GB11607Fisheries water quality standard
Pollution-free foodWater quality for marine aquaculture
NY 5052
NY5154Pollution-free foodOysters of the Yangtze River
3Seedlings
3.1Environmental conditions for seedling collection sitesbZxz.net
3.1.1Site
The wind and waves are small, the tide is smooth, there are mudflats or inner bays on both sides of the estuary where natural or artificial oysters of the Yangtze River are cultivated, and there are no pollution sources. The low tide water depth is 10m to the intertidal mudflats where the dry exposure does not exceed 15 days per month and the dry exposure does not exceed 4 hours per day. 3.1.2Water quality
The water quality of the sea area around the seedling collection site meets the requirements of GB11607, and the water quality of the seedling collection site meets the requirements of NY5052. 3.1.3 Bottom
Muddy bottom, muddy bottom, sandy muddy bottom and rocky bottom. 3.1.4 Salinity
Salinity range in seedling season: 3.87~~19.61. 3.1.5 Water temperature
Water temperature in seedling season: 24℃~31℃. 3.1.6 Site preparation
Tidal flat site, sowing mark, 1hm per piece, digging and building, artificial removal of harmful organisms and debris; deep water site, demarcation of scope, bamboo signs.
3.2 Timing of Seed Collection
During the breeding season of the Omiya oyster (May to August), measure the salinity of the seawater in the seed collection area every three days, observe the sperm and spawning of the broodstock, and examine the number of larvae of the Omiya oyster under the trawl microscope. When the salinity of the bottom seawater drops below 15.67 at high tide, and the plump, milky-colored soft parts of the broodstock become thin and transparent, place the seed collector for seed collection within 8 to 10 days; when the expected number of larvae in the shell reaches 25/m3 to 60/m2, place the seed collector for seed collection within 5 to 8 days. 3.3 Seed Collector
3.3.1 Types
NY/T5155-2002
Seed collectors include cement columns, cement sheets, rubber wire cement ropes, etc., and can also be used according to local conditions. Equipment with abundant sources, economical and durable; it is strictly forbidden to use condensing materials.
3.3.2 Quantity
Cement pillars (4.5cm×5cm×50cm) 12 pieces/m2 to 18 pieces/m2, cement sheets (12cm×12cm×1.3cm) 15 pieces/m2~25 pieces/m. Rubber cement ropes (s0.8cm~1cm, length 80cm) 30 pieces/m2~45 pieces/m. 3.4 Seedling method
3.4.1 Umbrella seedling collection method
Used in intertidal mudflat seedling collection sites. The middle cement column has a planting depth of 15cm~20cm, and the rest are built around the middle column in an umbrella shape (called "from"), with a planting depth of 5cm~10cm and an angle of about 60°. The "clusters" are arranged in rows, and the direction is consistent with the flow of the tide. 3.4.2 "Well" shaped seedling collection method
Applicable to seedling sites with hard bottoms such as rocks. Cement columns are stacked in a "well" shape, with 4 to 10 layers of columns per male, and 2 columns per layer. 3.4.3 Hanging seedling method
Applicable to seedling sites from the lower area of the intertidal zone to a depth of 10m at low tide. First, use a grid frame, float, etc. to build a stand, and then hang the seedling attachment on the stand.
3.5 Effect inspection
Determination Periodically go to the sea for inspection, clean the silt, observe and count the amount of oyster seedlings attached. If there are too few oyster seedlings attached, clean the seedling attachment device and then collect them. 4 Seedlings
4.1 Quality requirements
4.1.1 Specifications
Shell length is more than 5mm.
4.1.2 Seedling attachment density
The average seedling attachment density on the seedling attachment device should be 0.2 seeds/cm2. 4.1.3 Sensory broadcasting standards
4.1.3.1 Seedling attachment devices are uniform.
4.1.3.2 Seedling attachment devices with more than 40 seeds, 23 seeds, and 18 seeds on a single cement column, cement sheet, or rubber wire cement rope, respectively, should account for more than 90% of the corresponding seedling attachment devices.
4. 1.3.3 The seedlings are mainly brown-red in color, growing flat and without raised shell edges. 4.1.3.4 The attachment area of other attached organisms on the seedling attachment device accounts for less than 10% of the total area of the seedling attachment device. 4.2 Inspection method
Sensory inspection, place the sample to be inspected in a temporary holding pool or tank, and then observe and inspect it individually. 4.3 Inspection rules
4.3.1 Seedlings should be inspected when they are delivered for sale. The inspection items are carried out in accordance with 4.1. 4.3.2 Batch measurement
The batch is the one delivered in batches.
4.3.3 Sampling method
Randomly sample at multiple points for one inspection batch, and sample 10 each from the upper, middle and lower attachment devices, with the sampling quantity not less than 100 attachments. 4.3.4 Determination of inspection results
If there are any items that do not meet the quality requirements specified in 4.1 after inspection, additional samples should be taken from the original inspection batch for re-inspection. If there are still unqualified items after re-inspection, the batch of seedlings shall be judged to be unqualified. 5 Growing technology
5.1 Growing field environmental conditions
5.1.1 Site
Waters from the lower intertidal zone to the shallow sea area with small waves, smooth tides and no pollution. 5.1.2 Water quality
Should comply with the provisions of NY5052.
5.1.3 Bottom
Silty bottom, muddy bottom or sandy muddy bottom.
5.1.4 Water temperature
6 C~32 C.
5.1.5 Salinity
6. 49~32. 74.
5.2 Stocking time
NY/T 5155—2002
After the oyster seedlings are attached, they are temporarily raised in the seedling collection field for 3 to 6 months. When they grow to a shell length of more than 5mm, they are transferred to the grow-out field for growth. 5.3 Growing method
5.3.1 Grid type
Applicable to waters with a depth of less than 2m from the lower intertidal zone to low tide. The size of the grid structure varies from place to place, and it is made of cement piles or wooden piles, logs, bamboo, etc. Hanging culture, the spacing between seedlings is 30cm~40cm. 5.3.2 Floating raft type
Applicable to inner bays with a depth of more than 4m at low tide, small wind and waves, and relatively calm. The size of the floating structure varies from place to place and is composed of logs, bamboo, buoys, cables, anchors, etc. For hanging culture, the spacing between seedlings is 20cm~40cm. 5.3.3 Longline type
Applicable to offshore aquaculture areas with a low tide water depth greater than 4m. The frame is composed of piles, cables, buoys, middle ropes, cross cables, floats, etc. For hanging culture, the spacing between seedlings is 20cm~~40cm.
5.4 Management work
5.4.1 Adjusting density
The density of Oysters on the attachment: cement column 25 grains/piece~50 grains/piece, cement sheet 15 grains/piece~29 grains/piece, rubber wire cement rope 12 grains/piece~23 grains/piece.
5.4.2 Layout of aquaculture area
Each area of aquaculture site is a breeding unit, with a distance of 10m to 25m. The actual area used for aquaculture accounts for 15% to 25% of the water area.
5.4.3 Daily management
5.4.3.1 Elimination of harmful organisms and attached organisms Capture and remove carnivorous gastropods, scare or trap carnivorous fish and crabs, wash and remove attached organisms, etc. 5.4.3.2 Adjustment of aquaculture water layer
In the season when attached organisms are attached in large numbers, the water layer should be lowered appropriately. 5.4.3.3 Typhoon prevention
Before the typhoon arrives, reinforcement and transfer work should be done well. The oyster strings can also be sunk to the bottom of the sea and resettled after the typhoon. 5.4.3.4 Emergency Disposal
When red tide or oil spill occurs in the adjacent or aquaculture sea area, the oysters should be transferred in time. If they have been contaminated, they should be destroyed on the spot. 6 Fattening
6.1 Environmental conditions of the fattening farm
In the upper part of the bay or near the estuary, other conditions are the same as those of the grow-out farm. 6.2 Fattening timing
NY/T5155--2002
1 to 3 months before harvest; transfer must avoid the breeding period. 6.3
Farming method
Omi oysters are peeled off from the attachment and transported to the fattening farm. Holes are punched on the top of the shells to string them together and stick them on ropes with cement. They are then raised in suspension. The stocking density during the fattening period is one-third of that during the grow-out period.
7 Harvest
7.1 Specifications
Shell length is more than 15 cm.
September to May of the following year.
8 Purification
Oysters produced in areas where the water quality does not meet the requirements of Class I of GB3097 should be moved to Class I areas for temporary culture for more than 15 days until they meet the requirements of NY5154.
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