Hepu Eriocheir sinensis, also known as Hepu hairy crab and stone crab, is mainly distributed in Nanliujiang River of Hepu, Guangxi, Qinjiang River Basin of Qinzhou and the mouth of Fangchenggang River. Hepu Eriocheir sinensis has the characteristics of delicious meat, rich nutrition, and high economic value. It is one of the high-quality breeding fish with high development value. In order to speed up the promotion of the Hepu crab cultivation and help the majority of farmers get rid of poverty, the author combines the main technical experience with the following two years of breeding practices. 1. The selection of aquaculture ponds The choice of water sources is sufficient, the water quality is good, there is no pollution, drainage and irrigation are convenient, and the environment is quiet where the pool is built. The pond area is suitable for 700-300 square meters, and the water depth is 1-1.5m. The bottomsoil is preferably sandy loam soil, which has good ventilation performance and is conducive to the growth of benthic organisms such as snails, cormorants and aquatic grasses. The bottom of the pool is a “well†shaped ditch or row of ditch, which facilitates the hiding of hairy crabs. Hairy crab hi burrowing cave, can put bamboo, tile and other artificial crab cave. The crab pool is built around a 50-60cm high wall and is protected by double-layered membranes. It is tilted 60 degrees inside the crab pond and has rounded corners. 2. Before clearing the water in the clear pond, drain the pool water first and remove the excessive silt at the bottom of the pool to expose the sun. In the first half of the month before the release of crab seedlings, 75-150kg of lime per acre was used to sprinkling the whole pond in the pool to kill pathogens and wild fish, and to increase the calcium content in the crab pond and adjust the pH value. 3, planting aquatic plants in the crab pool planting water peanuts, water hyacinths and other aquatic plants. Provides feed, habitat, and shelter for growing crab shells and purifies water. Water plants cover 1/3 of the pool area. 4, crab seedlings stocking selection specifications, physical health, physical fitness, disease-free, no injury, crab crawling active stocking. Drug poisoning crabs, the survival rate is low, do not buy. The stocking density depends on factors such as crab pond size and conditions and feeding and management level. General crab size 80-120 only / kg, can be placed 30-40 kg per mu, before entering the pond, should be soaked in the pool water 2-3min, repeated 2 times until the crabs step enough water into the crab pond In order to improve the survival rate of crab seedlings. 5, daily management 5.1, water quality management Hepu hairy crab water conditions are relatively high. After the crabs are released, the water is changed 1-2 times a week. The amount of water exchanged accounts for 1/3 of the total volume of the pool water, so that the water in the crab pool is kept fresh, live, and cool, the PH value is kept at 7-9, and the water-soluble oxygen in the pool is maintained. More than 5mg/L, the transparency of more than 40Cm. Regular use of quicklime to adjust the water quality of the pool, 1m water depth per acre dose of 10-15kg, in order to increase the calcium content in water, is conducive to smooth hairy crab shell. 5.2 Feed management Hairy crabs, especially animal feed, in addition to adequate water supply, fish, shrimp, snail, potato, bran, and artificial pellet feed are also required. Daily dose is generally 8% -12% of its weight, and according to the weather, water temperature, water quality, etc., as well as hairy crab eating conditions, timely adjustment of feeding amount. Feeding twice a day, the amount of rations in the morning at 6:00-7:00 accounts for 30% of the daily dose, and 70% at 17:00-18:00. When feeding, animal and plant feeds should be matched to each other to avoid feeding a single feed, causing picky eaters, anorexia, and affecting growth. 5.3 Disease Prevention and Control After each water change, disinfect with bleaching powder or quicklime; add half-baked oyster shell crab bait once every two months, feed 2 times, and regularly feed oxytetracycline baits once, every time 3-5d. On the first day, the dosage was 0.2g per kilogram of crab and halved on the second day. 5.4. Strengthen guarding, prevent theft and escaping from theft, and often drive off predators. 6. When the hairy crabs of most hairy crabs have matured, they should choose the right time to catch them on the market in time to prevent crabs from escaping. The fishing method can be water-harvesting, that is, installing a net at the outlet of the pond and opening the outlet so that the water flows out. The hairy crab crawls into the cocoon with the water. When almost drained, water is added to the pond, and then the water is discharged again. repeatedly.
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