Laizhou City, Shandong Province is an important bay scallop factory seedling cultivation base, shrimp pond seedling maintenance base and shallow sea breeding base. As an intermediate link between the cultivation of seedlings and shallow-sea breeding, Shouchi pool seedlings has gradually moved towards standardization, scale, and industrialization. The main technologies are introduced as follows. I. Preparation 1. Bao Miao equipment: Bao Miao 100 million, the reference amount of various equipment: specifications 60 meters of floating raft 15, can be used instead of 360 strands of rope; raft 30, sandbags can be used instead; falling stone 1000; Miaosheng 180 shares, 3.5m/root requires 1500 roots; 50 seedlings need 3,000 heads, 40 heads need 3000 to 5000 heads, 30 heads need 15,000 heads, and specifications are usually 3040cm. 2. Shrimp tank selection: The shrimp pond area is estimated to be 100 million juvenile shellfish 10 acres or about a million acres of commodity seedlings. East-west direction, sand bottom or hard bottom, depth of water more than 1.5m. The maximum daily water exchange capacity is more than 20%. Normal drainage can be carried out during the mid-tide period. The water quality in the open sea is pollution-free. The inflow channel is far from the estuary and sewage outlet, and the seawater salinity is below 35‰. 3. Clearing pond fertilizer: Keep the seedlings in the pond before removing the sludge and weeds in the bottom of the pool, then level the bottom of the pond, compact the edge of the pool, and sterilize with bleaching powder of 30 to 50 ppm or quicklime (500 ppm). Juveniles enter the pool for 7 to 10 days before entering the water for 0.5m or less, applying 3 to 5ppm of nitrogen fertilizer and 0.3 to 0.5ppm of phosphate fertilizer. Into the seedlings 2 to 3 days before the maximum water level. The transparency of the fertilizer is 60-80cm, and the color of the water is yellow-brown, yellow-green, green, and light green. 4. Truss setting: The seedling rake is set after the clear pond, the direction is perpendicular to the inflow and outfall, and it is 20m away from the water inlet and outlet. The distance between the rafts is 3-5m, and the float is tied every 3-4m. Second, juvenile out of the pool and transport 1. Out of the pool time: First, according to the long-term weather forecast, at least 2 to 3 days without storms and cold currents; Second, the shrimp pond minimum water temperature above 13 °C and stable for many days, salinity Below 35 degrees, other physical and chemical biological indicators are within the normal range. Third, the nursery pool has gradually completed the cooling and brightness enhancement exercise, the water temperature is below 20°C, and the shrimp pool temperature difference is within 2°C, and the salinity difference is less than 5‰; The shellfish size is more than 400μm, and the quality and quantity of the juveniles are agreed upon. The fifth is that all personnel, equipment and transportation tools are ready. Followed by the conditions permit, they can first go through the "test water" and formally go out. 2. Quality inspection: First of all, it is necessary to investigate and inquire about the origins, specifications, time for egg maturation, cultivation conditions, medication conditions, feeding varieties and other issues. Then combined with microscopy, visual observation, swing test, cooling test, etc., to check the Pei seedlings density distribution, feeding, vitality, specifications and other indicators, comprehensive assessment of juvenile seedling quality. 3. Juvenile count: The number of eye-point larvae and metamorphosis were used as a reference, and both parties used a common sampling method. Sampling should be representative, generally sampling 4 to 5 points below 20m3, and taking more than 6 points for large pools. 4. Outing method: Cut the attachment base according to the size of the seedlings and the seedling density. The 3040cm seedling bags are filled with 50,000 seedlings per bag. Each bag is loaded with a bag and fixed in the bag wall with a polyethylene wire hanger or pin. , to prevent the attachment of multiple stacks. The binding method is a 2 bag family with a cluster spacing of 15-20 cm. Approximately 50cm should be left at the end of the seedling rope, and the attachment base should be longer for the net clothes, and the brown curtain can be shorter. The tapping operation should be carried out gently, quickly and accurately, and tightly connected to reduce the shedding or mechanical damage of the juveniles. 5. Juvenile transport: Usually after bagging and dry transport, long-distance transport should be carried out at night. The time should not exceed 6 hours. Before loading the seedlings, clean the carriages with seawater first, and then spread the seaweed grass or sponge or cotton cloth that has been thoroughly soaked in seawater for about 10cm. The bundled seedling bags are arranged on the kelp grass, a layer of seedling bags and a layer of kelp grass, and the kelp grass is placed on the uppermost layer, and can be arranged in a maximum of 3 to 4 layers. About 2,000 bags per car. After the equipment is installed, it is sprayed with seawater until it flows into the compartment and it is covered with white cloth. If the air temperature is high and the weather is dry during transportation, warm-keeping vehicles and refrigerated trucks should be used. The ice bags should be placed in the compartment to cool down, and the clean seawater should be sprayed every 2 hours or so. 6. The juveniles shall enter the pool and hang the seedlings: the personnel, vessels, and drop stones of the shrimp pond shall be properly arranged in advance, and the juveniles shall be unloaded directly onto the boat after the arrival of the juveniles, and a wet cloth shall be placed on the seedlings. When hanging the seedlings, take it gently to prevent falling rock pressure. Pay attention to adjust the length of the seedling rope, the position of the drop stone and the length of the falling stone line so that the uppermost seedling bag is under 30cm below the water, and the lower seedling bag does not touch the bottom, and no air bubbles are allowed in the bag. After the juveniles arrived, they suddenly encountered windy rain and temporarily added falling stones to the top of the head water. If possible, they could raise them in the nursery. Third, the daily management 1. Seedlings washed: juveniles into the pool 3 to 4 days, every time in case of strong winds, after the timely lifting of the seedlings bag, washed floating mud, to avoid plugging the mesh, so that bags inside and outside the water bait get exchanged. During operation, lightly lift it gently so as not to scrub the juveniles on the wall and on the attachment base. 2. Sub-bags: For some seedlings in the pool out of the seedlings due to the density of the seedlings and too much of the situation, in the juveniles into the pool stable to adapt to 1 to 2 days, they must promptly check the attachment base cut , Sparse by bagging method. When the bag is out of the bag, the bag is less than 50,000 and more uniform. Usually, when the beetle has not migrated to the old bag wall after 5 to 10 days after entering the pool, the attachment base is removed and the bag is dropped into the 40-head bag. 3. Water quality regulation: When juveniles enter the pool, water is mainly added. After 3 to 5 days, water flows for 1 hour every day. The daily water exchange rate gradually increases from 5% to about 10%. After the shellfish grows to 1.5~2.0mm, the daily water exchange rate is about 15%, and the natural sea area is simulated as much as possible to create a flowing water environment. Observe daily indicators such as water temperature, salinity, transparency, and water color to remove debris from the pool. When large numbers of protozoa proliferate or death from the death of monocytic algae causes abrupt changes in the color of the water, large water changes should be made immediately. Transparency more than 80cm should be top-dressed in a timely manner, topdressing inorganic fertilizer, the amount of each time not more than 500g/mu, nitrogen and phosphorus ratio of 10:1. 4. Growth observation: The shell height is usually measured about 5 days and the attachment of shellfish is observed at any time. If the growth rate of Pui seedlings is slower than normal, the reasons should be analyzed as soon as possible from the aspects of water quality, bait, bagging density, bag weight, juvenile quality, climate water temperature, etc., and be quickly improved. 5. Timely seedlings: When seedlings are seeded for 2 to 3 mm after 15 to 20 days, 30 seedlings are seeded. The method is to shade the windshield and brush the seedlings with brush or brushing, then collect the seedlings, wash the impurities, and concentrate on the plastic basins. According to the volumetric method, count and fill the 30-headed bags, and the density is 1000-2000. Grain/bags. When separating the seedlings, it is necessary to avoid the backlog of the seedlings in the pots for a long time, digging the seedling containers into cups, smooth edges, and leaking holes at the bottom and the four walls. After the end of sub-seedling, the density of the bait species and various water quality indicators shall be closely monitored to observe the attachment, distribution and growth of the shellfish seedlings. Fourth, the product shellfish out of the pool 1. Specifications Quality: According to the usual habits, as long as the Pui Miao brush seedlings quantitative into the 30 seedlings, specifications 3mm or so, that is, the product of shellfish. The quality of the shellfish is bright and bright, the ventral edge is thin, the shell thickness is moderate, and the fullness of the silk is more, and the toughness is strong. After being detached from the seedling bag, it can be reattached in a short time and the size is uniform. The deformed seedling and the disabled seedlings account for 5%. Below, it grows faster during the entire seedling maintenance period. 2. Counting method: Individual counting method is generally adopted, that is, 5 to 10 seedling bags are randomly selected from the same batch of seedlings as the sample count, the average number of each seedling bag is calculated, and the total number of seedlings is calculated according to the total number of seedling bags. Counting should pay attention to the consistency of the sample and the overall. If the supply and demand parties disagree with the counting method and the counting results, they shall re-sample the re-inspection after the agreement is reached, and the result of the re-inspection shall prevail.
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