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1.1 The water quality requirements are pollution-free, less windy, smooth, and salinity suitable, and a small amount of fresh water injection is better.
1.2 The quality of the beach requires a smooth, stable mid-low tide area. The surface has 5-10 cm of soft mud, and the bottom is more suitable for the sandy bottom. The mud or sandy sediment with less than 70% of sediment content is also acceptable.
2 Seining farms to set fences and remove predators is of vital importance in raising the survival rate of the culture.
2.1 Enclose the entire farm with a 0.8cm mesh weaving net. The height of the net is 2-3m (or 20cm when the net is exposed at high tide). The bottom of the fence is buried 20cm deep in mud, and it is tightly packed with mudbags.
2.2 The fence is laid at intervals of 5-6 m with 1 strut support. The upper, middle and lower walls are fixed firmly to the struts. The strut diameter is 3.5 cm and the bottom part is inserted into the mud 50 cm deep. And use polyethylene rope to tension the stay.
2.3 There are active net gates near the shore to facilitate management personnel's entry and exit. Net gates are normally closed.
2.4 Use a 1‰ chemically pure triazophos aqueous solution to spray evenly on the beach surface in the fence to eliminate the enemy's hazards completely.
3 Whole Beach Construction
3.1 The farm will be divided into culture areas of 20 mu in size, and then each culture area will be divided into 40 farming films of 50m in length and 7m in width in the direction of fluctuations. A large drainage ditch with a width of 60cm and a depth of 35cm was left in each breeding area, and a small drainage ditch with a width of 30cm and a depth of 20cm was left in each culture film to ensure smooth drainage.
3.2 Each farming piece is pushed with mud from both sides to the middle with a pusher plate. It is formed into a slightly convex shape in the middle. It is slightly lower on both sides of the road (about 20cm higher on both sides), and then the surface of the frogs is lapped with dense teeth. The mud mud ploughs and mixes well to ensure that the beach surface is delicate, soft, flat, and free of stagnant water.
4 Seed purchases are generally purchased from the late February to the beginning of April in Zhejiang Province to Yueqing and Yuhuan. When buying seedlings, they must strictly control the quality and resolutely put an end to the purchase of waste seedlings, overnight seedlings, and water seedlings. Good seedlings have the following five characteristics: a. Shell thickness, jade Baise, translucent, shell front yellow, shell edge is blue, sometimes with light red water pipes. b. The seedlings are plump and strong, the two shells are closed naturally, the shell edges are flat, and the individual size is neat. c. Vibrating Miao baskets. The two shells of the seedlings are immediately closed. They emit a buzzing sound and sound, and there is no response when they shake again. d. Dead seedlings, broken shells less than 5%, less impurities, clean. e. Place the seedlings on the surface of the beach and quickly extend enough to drill into the mud. The activity is lively and the potential for submerged drilling is rapid.
5 seed transport
5.1 Use aquatic product turnover boxes to hold seedlings and refrigerate trucks. The entire transportation process cannot exceed 70 hours.
5,2 The seedlings received will be washed several times with local seawater to thoroughly wash the sludge and prevent seedlings. And try to pick the net impurities, dead seedlings and broken shell seedlings.
5.3 Use fresh water before loading to avoid stickiness of the seedlings and facilitate long-distance transportation.
5.4 Each box is loaded with 2/3, about 12.5-15kg, separated by bamboo rows between the upper and lower layers to prevent pressing seedlings and squeezing seedlings.
5.5 The top layer is covered with 3 to 5 layers of gauze soaked in water, and the lowermost layer of plastic ice cubes is cooled.
5.6 Every 4 hours during transportation, spray with clean fresh water to reduce the temperature, spray 10-15kg each time, and spray the water to vibrate the seedling box before the number of vibrations. This will cause the seedlings to retract into the water pipe, avoiding excessive water absorption and affecting the survival rate.
6 Seed play
6.1 The returned seedlings will be immediately released into the sea by FCL to restore the physical strength of the frog seedlings, adapt to the local water quality environment as soon as possible, and increase the rate of the shoals.
6.2 Calculate the number of frogs to be newly planted in each piece. Take the method of grabbing the seedling box in one hand and gently picking it in the other along the small drainage ditch to prevent damage to the seedlings.
6.3 When seedlings are seeded, they should strive for uniformity, moderate density, and no wind or rain sowing.
6.4 Immediately after the tide has exited the beach, the seedlings shall be planted immediately to ensure that the seedling work is completed within half an hour before the flood tide, ensuring that the seedlings have sufficient time for the beach.
6.5 Seedling density should be properly adjusted according to factors such as water quality in the sea area, quality of the beach, and seed quality. Water quality fertilizer, good beach quality, high quality and quantity of seedlings, and the density of intensive culture can be slightly larger, and vice versa is slightly smaller. In addition, the mudflats with a high sediment concentration are increased by about 30% compared to soft mudflats, and the seedling volume is increased by about 20% in the low-tide areas compared to the high-tide areas. Generally, 200,000 - 250,000 seedlings are played 1.5cm per acre. Granules are more suitable.
7 Develop management of seedlings for special management after stocking, and visit the beach every day. Two days after seedling, the survival rate of the frog seedlings was checked from the dead skin and pod bore of the beach surface, and if the survival rate was low, the seedlings should be promptly filled. Check whether the struts are inverted, whether the fence is damaged or not, and regularly clean and wash the surface of the fence to prevent water plugging. Check whether the flat surface of the beach is filled with water and find that mud loss has been filled in a timely manner. In particular, after large winds have passed, water must be drained in time. Regularly dredge the drainage ditch around the fence and in the farm, and found that the silt deposition should be promptly scraped to ensure the smooth flow of water. At any time to clear the enemy, the invading birds will light firecrackers to drive away; jade snails and crabs will be caught in time; find the goby fish cave and use a small wooden stick wrapped with cotton balls to pick up the triazophos and point it in the cave. It kills.
8 After harvesting and breeding for 6 months, the length of the shell can reach more than 5cm and 70-100 grains per kg. Usually harvested in October-November that year. The harvesting method for earthworms is relatively simple. In the soft mudflats of the beach, it can be directly inserted into the beach to take the earthworms; the beach with the harder mudflats can be used to turn the earth till harvesting; the mudflats can be used on the mudflats where the density is relatively thin. take.
Pelican beach cultivating technology
1 Selection of aquaculture sites According to the ecological habits and aquaculture characteristics of alfalfa, the following two aspects are mainly considered when selecting aquaculture sites.