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Second, semi-artificial seedlings The law refers to the seedlings in the natural sea area, artificially created by the seedlings for the attachment of different types of seedlings to increase the amount of attachment, known as semi-seedlings. At present, this method has accumulated rich production experience in China, and it can be summed up as follows: the mode of seedlings with seedlings and seedlings with seedlings, etc.
1. Tillering and replenishing Tillering is a key point attached to the seedlings, which allows the original site where no seedlings can be propagated to be transformed into a suitable place for seedling growth, thereby expanding the seedling production base. In the coastal areas of Fujian, there has been widespread development of seedlings. Due to the different topography and geology in different parts of the country, the construction of seedlings is various.
(1) The ditches with a width of 40 cm and a depth of about 10 cm will be integrated into the ditches of seedlings. The seedlings will have a width of 3 to 5 meters and a length of 10 meters. The film is called Miao Ping. There is no need to build embankments on this floor, and there are fewer expenses, so you can make full use of the tidal flat.
(2) The nursery nest is suitable for places with large wind waves or high tide areas. Excavate the embankment around the depression, keep the embankment at a height of 0.6m to 1m, and open a 50cm wide nozzle on the side of the ditch to reduce the wind and waves. Because of its concave seedlings such as nest, so called. The nest area is 60 cubic meters to 130 cubic meters.
(3) The seedling shoots are suitable for high school tide areas with little wind and waves. Dug up the earth and pile up on both sides and above the seedlings to form seedlings with dikes on three sides. The embankment height is generally 0.5 meters to 1 meter, and the width is 2 meters to 3 meters. The surface of the embankment is highway-shaped, and each embankment is 660 cubic meters to 1320 cubic meters.
The three types mentioned above all have one thing in common: the whole process can be divided into three steps: 锄埕, 耙埕 and 畦, where 畦 is the key to 埕. Pingyi is used to flatten the spatula 1 to 2 days before the juveniles are attached. Each batch of spawning larvae must be flattened before spawning. This multiple breeding method is a good measure for stable production and high yield of the seedlings, but it is only applicable to seedlings with high moisture content. It is worth proposing that the prediction of the insects and their seedlings is a research result in recent years. It is based on the pro-spawning time, the larval floating time, and the meteorological conditions, and forecasts the time for the attachment of the insect larvae in order to determine the level in time.畦 date. Practice has proved that timely growth of seedlings can increase the amount of seedlings attached, which is a key to seedling production.
2. Wai Tong with seedlings This is a widely used seedling method along the coast of Zhejiang. Miao Tong is similar to the seedlings nest in Fujian. The difference is: Miaotang is small, with 8m 8m and 8m 10m. Species; excavate soil to build embankments, the embankment width 1.2 to 1.4 meters, about 0.5 meters high; seedlings around the embankment, leaving a water in and out of the ditch, a width of 1 meter, 10 cm below the surface of the pond, into the drainage ditch and The coast is vertical; when the pond is used, the painted surface shall be leveled, smashed and smoothed to block the water outlet, and the water shall be filled with 30 cm to 50 cm in order to deposit new mud. The water outlet shall be drained only 2 to 3 days before the seedling is attached. , Then use the push stick to gently tilt the flat surface of the pond toward the inlet and outlet, which is beneficial to attach the seedlings; after 10 to 15 days after the seedlings are attached, use the pusher to lighten the surface of the seedling pond every 3 to 4 days. Lightly push back and forth twice, scratching the topsoil for 1 month, which keeps the coated surface moist and prevents the seedlings from moving. However, this continuous flat coating operation must be very careful, preferably when the tide just exits the painted surface. (Yang Wei)
Seedling seed collection method
First, the collection and cultivation of wild seedlings This method is mainly popular in coastal areas such as Yuhuan, Yueqing and Ninghai in Zhejiang. Net bags can be used to collect the juveniles scattered on the expansive shoal and put them in temporary pond culture. The area of ​​temporary ponds is small, only a few dozen square meters, surrounded by squats, and a water outlet is opened above and below the pond so that the tide can advance and retreat. Juveniles will be replumbed, finely chopped and leveled at the bottom of the pond 1 to 2 days before stocking, in order to facilitate the burrowing of the caves. Temporary ponds should be selected where small tides can also reach 1 meter into the water. The stocking density depends on the seedling size. During the holding period, the pond can also store about 15 cm of water after low tide, which is conducive to the cultivation of benthic diatoms. During the winter, it is necessary to prevent the dam from leaking water, and when it is cold, the depth of water storage should be increased to prevent the seedlings from freezing. When the juveniles are cultured to 4 mm to 8 mm, the seedlings need to be removed from the pond and the seedlings grow to about 1 cm in length and can be moved to a breeding farm for breeding.