Amaranthus is one of the four major cultured shellfish in China. It is widely distributed in the coastal areas of China. In the inner bays where winds and waves are calm, the tides are unimpeded, and fresh water is injected, the tidal flats in the middle and low tide areas are suitable sites for the growth and reproduction of earthworms. It is a wide-tempered marine organism with normal water temperature of 8-30°C, suitable for seawater with a specific gravity of 1.005-1.020, and the main bait is a weak planktonic diatom and benthic diatom which is easy to sink, and organic detritus. . Scorpion dioecious, one-year sexual maturity, breeding season is generally in autumn that September and October. Zhejiang Sanmen Bay and Yueqing Bay natural sea area are rich in seed resources. Each year, “Equinox,” “cold dew,” “frost,” and “winter” are spawned in four seasons. Artificially-cultivated fish are collected from the sea. After the collection, intermediate breeding and restocking are conducted to develop product specifications in the breeding area.
First, the entire seedlings with seedlings during the breeding season in Fujian, Zhejiang coastal 9 to November, the peak period is October, Shandong, 3 to September. The fertilized egg undergoes cleavage and hatches and develops into D-shaped larvae. After a period of planktonic life, mature metamorphosis, and after a brief attachment life, the fertilized egg is transferred to buried life. At temperatures of 20 to 24°C, it takes 7 to 10 days from the fertilization of the eggs to the entry into benthic camp burrows. We need to artificially set seedlings when we grow into D-shaped larvae.
(A) The site is calm, smooth, with fresh water injected into the coastal inner bay, seawater specific gravity between 1.008 to 1.018, breeding season water temperature 15 ~ 20 °C, pH value of 7.8 ~ 8.6, flat terrain slightly tilted tidal flat area The bottom quality is better with a mixture of mud and silt.
(II) Miao-tsai cultivation During the “Equinoxes” to “Cold Dew” period, the seedlings will be dug and built, and the selected seedlings will be divided into several rectangles arranged in rows to serve as seedlings. Banks and trenches are left between rows and rows. The seedlings are 30 meters and 10 meters in size and are oriented perpendicular to the channel. The shore base is 0.6 to 0.8 meters wide, the channel width is 2 to 3 meters, and the depth is 0.1 to 0.15 meters. The surface mud of the mudflat was dug up and a trapezoidal embankment was built around the seedlings. The embankment height was 0.3 to 0.5 meters. The width of the embankment depends on the size of the storm. The waves are wide, but the width is narrow. Generally, the width is 0.8 to 1.2 meters, and the width is about 0.3 meters. A gap is left on each of the two embankments parallel to the channels on both sides for water intake and drainage. In places where winds and waves are relatively large, Miaowa is built into embankments on the outskirts. Its specifications are 1.4 meters wide, 0.4 meters wide, and 0.6 meters high. The cross section of the embankment is slightly arcuate, surrounded by black polyethylene paper or mixed with straw and mud to construct the embankment. The gap between the embankment and the trench remains the same size as the trench. All embankments must be compacted, and it is advisable to build 1/3 of the height of each tide to filter the water and increase the strength of the embankment.
(C) Preliminary preparations
1. After the construction of the extermination vaccine plant is completed, use a 1:700 "triazophos" liquid 150 g/mu or 1:600 ​​"marathon" liquid 250 g/mu to spray on the seedlings. , crabs, snails and other predators.
2. After the construction of the drug, the soil is loosened every other day and loosened. The depth of soil is 0.2 to 0.3 meters. Then, the soil is finely crushed and evenly divided by smashing the soil. Water will be stored in a timely manner after the construction and the water depth will be maintained at about 0.3 meters. The best time for water storage is more than half a month, so that new sludge can be produced in the seedling shoots.
3. The closer to the date of attachment, the higher the seedling volume. In the midst of a tidal wave and a tidal wave, it should not be smooth. Pingshuo work will strive to be carried out within 1-3 days before the advent of the seedlings. The water will be drained from the pool, and the sludge will be flattened and lightened with a wooden board or mud horse on the entire gravel floor. , surrounded by a lower bulge. The seedlings with more water content are often flattened and have better seedlings. Repeatedly, only after each batch of larvae is attached, it is sufficient to gently push and smooth the oil on the surface, and it is not advisable to use too much force, otherwise it is easy to damage the previously attached seedlings.
In order to correctly grasp the seedling-attaching time and timely correcting, we must do a good job in forecasting. The specific approach is: during the breeding season, daily inspection of intimal gonad development and sperm-egg emissions; examination of sea larvae development stages and the number of changes, when the sea larvae abruptly reduced, indicating that the larvae have been attached. It has been found through practice that the time from the fertilized egg to the larvae varies with the temperature of the water, so that the prediction can be accurately made and the leveling can be carried out in a timely manner.
(d) Management measures
1. Surface management After the seedlings are attached, the water can be stored for 7 to 8 days to accelerate the growth of the seedlings. After 20 days with seedlings, ditches are excavated around the seedlings that have been overly thin and muddy. This will reduce the moisture on the surface and keep the mud soft and solid. This will not only stabilize the original seedlings, but also increase the amount of seedlings.
2. Miao Miao inspection found that the embankment collapsed in a timely manner to repair and repair; smashed the surface was stormed into pockets in time to fill the leveling; gutter clogging in time to clear. The seedlings of seedlings are sorted out once a month.
3. Water management After the winter solstice, the ditch should be properly filled with shallow water to increase the water content of the seedling soil. After winter, water should be kept warm to prevent seedlings from freezing to death; the weather is warmer, the embankment is drained, the tide is kept open, and seedling growth is promoted; when it is clear and not rainy, when the proportion of seawater exceeds 1.018, freshwater regulation is required.
4. In addition to killing predators by covering the seedlings with nets, traps, shots, and other methods can also be used to expel fish, snails, crabs, ducks, and other predators. For insecticides with severe predators, use insecticides as appropriate.
(e) Harvesting of seedlings begins from December each year to March of the following year, and seedlings can be collected when the seedlings reach 1.5 centimeters. The harvest period in the south is from the lunar calendar in December to March in the following year and harvested in large quantities in the January and February of the lunar calendar. Harvested twice a month, during the tide. Harvesting methods are as follows:
1. Screening of depressions suitable for Yamiaoping. With hands or mallets, the seedlings are dug together and the mud is dug up to the center of the earthworms. When the tide rises, the seedlings in the lower layers are drilled upwards and concentrated on the surface. In this way, the density of the seedlings will increase by 1 time, and will be 2 or 3 times. After the overlap, dig a puddle next to the seedlings to store water. In the midst of the flood, the seedlings in the center of the seedlings are placed under the tide, and even the mud is dug up and placed in the screen. The soil is washed in the puddle and the net seedlings are obtained. .
2. Washing, also known as litter washing, is suitable for the harvesting of seedlings from seedlings. The seedlings were stored on the day before the seedlings were collected. The next day, with the six-tooth rake on the seedling lice, it was repeatedly shaken with muddy mud, and the water was stirred into mud. After a little sedimentation, the seedlings floated on the surface of the water, and then they were picked up with a net and washed.
3. Washing is a combination of the first two methods of washing seedlings, the first stack of soil, and then stir into the water storage mud, and use Miao network picked up.
4. Hand to capture the value of seedlings with little seedlings or missing after washing, as well as wild seedlings, no value of washing seedlings. When the seedlings grow to about 3 centimeters long, they are captured one by one by hand. This method is inefficient.
Second, the middle of the nursery seedlings When the juvenile shell length reached 1 mm, they were moved to the outer sea or shrimp ponds to start the intermediate cultivation of seedlings. From the attachment of juveniles, after about 110 days, it can be grown into commercially available seedlings with 1.2 to 1.5 cm in length.
(1) The environmental requirements are selected to be smooth in the upper and middle sections of the high tide area and the middle tide area, the beach surface is smooth, the coating quality is stable, the tide is smooth, and the flow velocity is slow. Mud or silt, less enemy predatory biomass, rich dietary biomass. Sea water temperature 8 ~ 32 °C, and more stable; salinity 8 ~ 33; pH value of 7.8 ~ 8.6.
(B) Site Preparation
1. The whole construction of the pond is completed 20 to 25 days before stocking. A low dam with a width of 300 cm and a height of 50 cm around the painted surface of the seedling shall be cultivated. The surface of the bottom of the pond shall be 20 to 30 cm below the outer surface of the pond, and the inside of the dam shall be 20 to 30 cm deeper than the bottom of the pond and 50 to 50 cm wide. 100 cm of edge ditch, leaving the inlet of the lower corner of the pond, when the tide rises, the seawater can flood over the pond dam, and after the ebb tide, the beach fills 30-40 cm. The pond area is suitable for 200-600 square meters.
After the whole tidal flat cultivated by the pond, a fence should be set up. A 20 to 40 mesh nylon screen should be set around the nursery to set a fence with a height of 1.5 to 2.0 meters.
2. Remove the predator pests and paint the surface, use a 20 to 40 mesh bag to scrape off predators such as snails and crabs. The use of drugs to clear the enemy, commonly used Qingtang drugs and methods of use.
(three) seed selection and stocking
1. The selection of intermediate seedlings The seedlings are clean, uniform in size and less in impurities; the shells are complete, the shells are less, the shells are brighter and whiter, and they have luster; the fresh vitality is strong, with a smell of grass. Hand wipes the surface of the seedlings and the seedlings immediately produce a contraction response. Hit the seedlings on the edge of the device and make a buzzing noise.
2. In principle, seedling density is small, the sea area fertilizer, benthic diatoms grow well, and the stocking density is high; otherwise, it is low.
3. Seedling method to put seedlings to avoid heavy rain, fog and other bad weather. Using natural beach cultivation, sowing seedlings are conducted at low tide. Smaller size seedlings, hand and seed in the water slowly spilled. Larger seedlings of the seedlings are hand-applied on the painted surface and gently wiped so that the seeds adhere to the painted surface.
(IV) Cultivate and manage the seedlings under the inspection of logistics and store, drain and repair the ponds in time. Frequent removal of predator organisms, keeping the surface flushed and draining, no accumulation of water. Always check the survival and growth of the seedlings. During the cultivation process, the seedlings are regularly planted, loosely coated, and smoothed. In frosty weather, the pond should be filled with water. Before and after the beginning of spring, seedlings were reared in a timely manner according to the density and growth of the seedlings.
(e) Harvesting of seedlings from the first month to the Ching Ming Festival, with a seedling length of 1.5 to 2.0 cm, can be collected and sold. Before washing the seedlings, turn the seedlings on the surface and close them with water. In the second wave, mix the mud by hand and paste them. The seedlings will be plucked out of the mud surface. The seedlings will be collected by the sea catcher or scraped seedlings. Get up and wash in clean water.
(6) Seedlings shall be filled with utensils such as baskets or plastic baskets, covered with 2 to 3 layers of gauze soaked in water to prevent drying, and refrigerated vehicles are the best means of transportation. During transportation, they are protected from sun exposure, rain and wind. The temperature is below 20°C, and it is resistant to dry transport for 48 hours; when the temperature is above 20°C, it is maintained for about 36 hours.
Author: Zhejiang Sanmen Fisheries Technology Extension Station Zhejiang Fisheries Technology Extension Station

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