(1) Selection of shallow aquaculture breeding sites (1) The terrain is relatively flat, and after the ebb tide, a broad intertidal zone can be exposed, and some dried water must be accumulated on the beach. (2) The sediment is hard, with sandy bottom and muddy bottom as the best. (3) Small waves, clarified water quality and smooth flow. (4) There must be a certain amount of freshwater inflow and rich nutrient salts. (5) The proportion of seawater changes within the range of 1.005-1.025. (6) Changes in seawater temperature As long as it does not freeze in winter, the summer temperature does not exceed 35°C. Breeding methods (1) Sapling rearing: When the river saplings are more than 5-6 cm long, the shoal is properly sorted to remove the algae, and then the sorghum seedlings are sprinkled neatly on the shallows for cultivation. The density of seedlings is preferably about 30 cm from each growth base. After 3 months of culture in the South, the length of the algae is generally about 1m, and it will not reach the harvest standard until June and July in the north. Although this farming method is relatively simple, but as long as properly managed, the fertile sea area, the per mu dry products up to 100kg or more. (2) Coupling farming: Bamboo sticks are made of bamboo, 15cm long and 0.5-0.7cm wide, and they are cut into a groove-shaped jaw at the top of the sign at 1 cm to clamp the seedlings of the river lice. During the operation, about 10cm length of G. striata was unplugged from the original growth base. After finishing, the bamboo shoots were clamped and the seedlings were clamped. The ebb tide was planted at a spacing of 50cm and plant spacing of 20cm. Generally, 6000-7000 trees are planted in Mu, after 2-3 months of cultivation, the operation can reach more than 1m. (3) Net curtain seedling cultivation: In the shallow intertidal flats, select a flat and slightly watery place, penetrate a small distance from a certain distance, and fix the net curtains. Each mesh clips a cluster of gizzards. Seedlings are cultivated in Jiangyan. Cultivation management (1) Miao Miao and nursery: Due to the impact of wind and waves, the seedlings are not firmly clamped or the seedling stakes are not inserted deeply, and they are often lost or lodged. Therefore, after checking the seedlings, they should be checked frequently and found that the seedlings or lodging should be promptly filled or uprooted. (2) Removal of predator organisms: during the cultivation period, river leeks, as well as other algae such as Enteromorpha, etc. compete for nutrition, hindering the growth of river otters, snails, waterfowl, and fish, etc., often feeding on river otters. These should be timely. Try to rule out. (3) Scrubbing floating sludge: When there is floating sludge on the surface of the algae, it must be cleaned in time, otherwise it is not good for growth. (4) Overwintering measures: In the northern part of the Yangtze River, where winter weather is cold, it is necessary to take overwintering measures. (2) Selection of cocoon-cultivated aquaculture sea areas (1) The trend is smooth, the winds and waves are small, the breeding equipment will not be damaged, and the river algae body will not be easily broken off. (2) The water quality is fertile and there is inflow of fresh water. (3) The water quality is clarified and the transparency is relatively high. After the ebb tide, the water depth is 2-5m in Shanghai. Breeding method Aquaculture water depth is generally 2-3m, floating rafts are equipped with 6-8 floating rafts, float rafts are each about 30m in length, 7 bamboo floats are used with a length of 2m, and floating rafts are fixed at both ends by cables. The floating raft is parallel to the raft and the distance is 3m. It is set in the downstream direction. Miao Miao Wild Miao Miao (also available polyethylene) diameter 1-1.5cm, flat raising clip rope length 3.6m, hanging clip rope length 1.8m, pitch 25cm, every 16cm from the seedling rope A cluster of 1-3 seedlings per cluster. Breeding management (1) Regulation of the water layer, the shallow light in the water layer is too strong, which can lead to the death of the river pupa; the deep layer of water in the water layer is weak, and the river larvae grow slowly. It is advisable to adjust the water layer for general breeding to 20-40cm. (2) For fertilization, there is a large gap in nutrients in the sea area. Fertilization should be considered in the poor sea areas in the north. For example, the ganoderma genus was soaked twice a week for 1 hour with 0.1% ammonium nitrate solution. (3) There are many factors that are unsafe for safe nursing and squatting aquaculture production, especially for seasonal winds, which often causes great losses to production. Therefore, the truss should be frequently subjected to safety care.
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