Located in Shandong Peninsula, Changdao County is the only island county in Shandong Province. It is famous for its sea cucumbers, abalone, sea urchins, and scallops. At the same time, as China's formal accession to the WTO and the people’s material living standards continue to increase, both domestic and foreign markets Demand for Bohai Sea treasures is increasing. However, at present, the bottleneck that restricts the development of seafood and seafood production is the number and quality of seed. Therefore, it is of great significance to strengthen the construction of breeding facilities for seed and seedlings, improve the cultivation ability of seedlings, accelerate the development and domestication of new seedlings, and promote the rapid and healthy development of sea cucumber breeding. In recent years, many enterprises and self-employed residents of Changdao County have rapidly set off the construction of greenhouse nursery, seedling conservation, and tidal flat culture of sea cucumbers under the technical guidance of the County Fisheries Research Institute. Up till now, the county has established more than 500 nursery sheds. Each greenhouse is calculated based on an investment of 300,000 yuan. The minimum annual gross income can reach 650,000 yuan, and the net profit can reach more than 300,000 yuan. The economic benefits are very considerable. This article is a simple introduction to the design and construction work of nursery seedlings and nursery shelters for reference only. First, the location of nursery greenhouses Selection of sea cucumber nursery greenhouses should be located close to the beach, a slightly higher place, in order to facilitate the extraction of sea water, discharge of waste water. 1. Water intake The sea water intake requires that the seawater be clean, free of pollution, and free of debris; the water pump and faucet should be covered with a filter to reduce the entry of algae. 2. Sewage outlets and nursery ponds The discharge outlets for regular discharge of waste water should be far away from the water intake and should be no less than 50 meters away. 2. Treatment of greenhouses in greenhouses The underground basins in the greenhouse are ground-based structures. According to the needs of aquaculture, the pools must meet the requirements of non-leakage. Therefore, the anti-seepage treatment at the bottom of the pool, the junction between the pool bottom and the pool wall is particularly important. After the construction of the greenhouse was completed, a 10 cm gravel cushion was laid on the floor of the shed, and the C20 concrete was used to cast the floor on site. III. Design and construction (300 square meters of water body greenhouses as an example) 1. Nursery greenhouse size: The hollow brick for external walls of the greenhouse (size: 40 cm, 20 cm, 19 cm) is masonry, the net length is 35 meters, and the net width is 12 meters. Shed The flat mouth height is 2.2 meters, and the maximum dome height is 4 meters. There are aluminum alloy windows on the long side walls of the greenhouse, 6 on each side, and there are no doors and windows on the short side gables. The roof of the greenhouse is constructed of a rebar-beam structure with a span of 12 meters. It is covered with an entire black plastic cloth. The plastic curtain is covered with straw curtains and is firmly fixed to prevent wind damage. 2. The size of the pool in the shed The size of the surrounding wall of the pool is masonry with bricks (24 cm, 12 cm, 5 cm), and cement mortar No. 70 is used to make a joint. The thickness of the wall is 25 cm. The wall of the lagoon separated by the pool is 13 cm thick. The pool is divided into two along the width of the shed and symmetrically arranged. The middle is the sidewalk and drainage channel. Each small pond has a net length of 5 meters and a net width of 2 meters. The depth of the pool is determined by nursery and seedling preservation. If the nursery and seedling nursery, the pool depth is 1.2 to 1.8 meters, generally 1.5 meters; if only for seedlings, the pool depth is 0.8 meters. Each small pool is reserved for inlet and outlet, and the inlet is on the side of the outer wall. The water outlet is on the side of the sidewalk. The drain is 3 cm from the bottom of the pool and each valve is controlled. The small pools are not interconnected, and each is independent. There are 30 small water pools that can be laid in 300 square meters of water. The “five-layer work surface method†is used for plastering to prevent leakage. The sidewalk between the two rows of small ponds serves as a drainage channel and is 0.8 meters to 1 meter wide. 3. Boiler room winter and spring due to low temperature, low water temperature, is not conducive to seedlings, seedling protection, it is necessary to build a heating boiler room, heating to the shed to ensure the water temperature at 15 °C ~ 16 °C, which will help the healthy growth of sea cucumber seedlings. Heating fins can be mounted wall-mounted or placed directly into the pool. Heating forms plumbing, gas heating can be. For a large-scale breeding and preservation enterprise, taking 2,000 square meters of water as an example, if boilers are used for heating, only 70,000 yuan will be needed to burn coal for one year, plus pipelines, heat sinks and boilers will require large investment. In order to reduce investment, a seawater well can be drilled in place. Drilling a seawater well with a depth of 70 to 80 meters, only 80,000 yuan is required after supporting the pump, which can save the cost of burning the boiler. 4. The seawater temperature in the seawater in the seawater well is between 15°C and 16°C all the year round. It is close to the constant temperature. This temperature is the most prosperous temperature of the sea cucumber. The constant temperature water in the seawater well is pumped directly into the pool in the greenhouse and it circulates. It is not only beneficial to the growth of sea cucumber seedlings, but also can significantly reduce the cost, and can also solve the problem of poor control of heating and warming water temperature, which is a feasible way. 5. Transmission and Drainage Pipes PVC pipes with a diameter of 100 mm are fixed along the two long sides of the wall of the greenhouse, and three short pipes are provided according to the number of pools. The water is delivered into the pool. All three pipes have valves. control. Some self-employed households can reduce their investment by using portable hoses instead of fixed pipes to transfer water to each pool. The sidewalk also serves as an indoor drainage channel. The exit is on the side of a gable wall (water inlet pipes and outlet nozzles have been reserved during construction), and the discharged waste water is drained to the sea far away from the sea water intake via the outside drain pipe (diameter 150 mm). 6. Placement of ponds for inner breeding and keeping seedlings The standard sea cucumber nursery baskets are white plastic baskets. The baskets are in the shape of a four-edged table. The upper mouth is 43 centimeters and 40 centimeters in size, and the lower mouth is 33 centimeters and 30 centimeters in height and 40 centimeters in height. The small pool is generally placed in a basket of 3 to 5 rows, each row of 12. The top of the basket is 40 centimeters away from the surface of the water. The water depth should not be too large, otherwise the sea cucumber seedlings cannot withstand the water pressure. When raising the seedlings, hang 2 layers along the water, the bottom baskets are hung directly on the bottom of the pool, and the upper baskets are left at a distance of 20 cm to 30 cm. Generally, 50 to 60 eggs are hung in each pool; when keeping the seedlings, only one is hung. Floor. Normal seedlings can emerge from 10 days to 15 days. The sea cucumber seedling raising and seedling preservation techniques have been widely used in Changdao County, Shandong Province. It not only can solve the problem of low resistance to sea cucumber, improve the natural resources that are gradually depleted under the massive human capture, but also make the marine environment Recovery and improvement are important ways for coastal fishermen to increase their income. The application of this technology in coastal areas is of great significance.