Hairy crab rearing methods
Pond conditions
Planning the construction of 20 high-standard ponds, a single pond area of 15 acres, in which the deep water depth of 1.5m, shallow water depth of 0.6m, the slope ratio of 1:2.5. Aquaculture ponds have sufficient water sources, fresh water and pollution-free, easy drainage and irrigation, loamy soil substrate, lush aquatic grasses, the environment is more secluded.
Installation of anti-escape facilities
Bamboo poles to support the non-drip plastic film for the anti-escape wall, fixed with wire, tight, buried underground 15cm ~ 20cm and tamped, the ground 40cm ~ 50cm higher, the corner of the pond into an arc.
Pond clearing and cultivation of bait organisms
Snap crabs stocked 15 days before (April 13), the application of quicklime 75kg / mu, water slurry evenly sprinkled after the whole pond to completely remove the pond hostile organisms. After clearing the pond into the water, strictly prevent frogs, snakes, rats and harmful fish into the pond. 10 days after disinfecting the pond water, start fertilizing to propagate the basic bait organisms, the amount of fertilizer for the fermented cow and pig manure 100kg/mu, urea 1.5kg/mu, calcium superphosphate 3.0kg/mu, so that the transparency of the water in the pond reaches 40cm. planted in the pond Rutilated grass, duckweed, zucchini, and other aquatic plants, the area of the total area of the pond, 1/3, in order to improve the ecological environment of the water body of the pond, to prevent the disease of hairy crabs, and at the same time, for the hairy crab feeding and eating, and for the water to be used to feed the water. The pond is also a good place for the crabs to feed and live.
Selection and stocking of crab species
Crab species selection requires robust, neat specifications, body color green and yellow, complete appendages, disease-free purebred Huanghekou hairy crabs.
On March 28th, the specifications of the 120/kg ~ 150/kg of button crab seedlings into the pond, stocking density of 5kg/mu, and in the stocking of the concentration of 4% of the saline disinfection of 15 minutes before stocking.
Water quality management
The water quality of the crab pond should be clear, clean and rich in dissolved oxygen. Crab ponds regularly change water, so that the dissolved oxygen in the water body to maintain more than 5mg / L, and throughout the breeding period of the pH value of the water body is always controlled in the 7.5 ~ 8.7. June to September high temperature season, crab ponds every 10 days to replace the water 1/4 ~ 1/3, and keep the water level before and after the water change is basically the same to prevent the water level of frequent large changes affect the hairy crabs feeding and moulting.
Breeding management
When feeding, adhere to the principle of reasonable mix of fine, coarse and green feed, animal bait accounted for 35%, aquatic grass accounted for 45%, and all kinds of roughage accounted for 20%, the daily feeding amount of hairy crabs 3% to 5% of the body weight, and the specific daily feeding should be adjusted at any time according to the growth of hairy crabs, the weather, and the quality of water, etc. The feed is placed in the set feed table. The feed is put on the feed table for checking the feeding situation of hairy crabs, and the feed is fed subject to the completion of the next morning.From May 2 to September 12, the full-price river crab feed and plant bait with added chitin are fed; after September 12, animal bait, such as wild miscellaneous fishes and animal scraps, is fed to enhance the body quality of hairy crabs. Regularly patrol the pond 3 times a day, morning patrol is mainly to see whether the hairy crabs lack of oxygen floating head, check the feed table with or without residual bait, whether the hairy crabs moult, in order to determine the amount of feeding throughout the day; midday patrol is mainly to see the color of the water, water clarity and quality of the water is good or bad, to observe whether there is anomalous phenomena, there are no sick hairy crabs; evening patrol is mainly to check the hairy crabs to eat whether it is normal, the escape prevention facilities are safe, whether there is a hostile organisms in the pond. Especially in the windy, rainy weather should be strengthened day and night patrol, and do a good job of breeding records.
Disease control
Crab disease is more popular in July to September, you can regularly use drugs to prevent. Splash drugs every 10 days, use bleach 1g/m3, dibromohydantoin 0.2g/m3, and two kinds of drugs are used alternately; use zeolite powder 20kg and photosynthetic bacteria 2.5kg/mu evenly splashed every 10 days to keep the water environment stable.
Nutritional value of hairy crabs
Crabs are rich in nutrients, containing a variety of vitamins, including vitamin A is higher than other terrestrial and aquatic animals, vitamin B2 is 5-6 times more than meat, 6-10 times higher than fish, 2-3 times higher than eggs. The content of vitamin B1 and phosphorus is 6-10 times higher than that of general fish. Every 100 grams of edible part of crab contains 17.5 grams of protein, 2.8 grams of fat, 182 milligrams of phosphorus, 126 milligrams of calcium, 2.8 milligrams of iron. In addition to rich in calcium, crab shells also contain crab red pigment, crabs, etc..
The crab is not only a delicacy in the food, as a medicinal also has a strange function. The herb gleanings" said: "The function is not only scattered, but also can be used as a medicine. Its function is not only scattered, and can and blood also. The motherland medicine that the crab is cold and salty, crab meat has a heat, blood knot, continue to break the injury, and nourish Yin and other functions; its shell can clear heat and detoxification, break the accumulation of pain.
Modern research has found that crab shell contains a substance? Chitin, chitin can be extracted from a substance called ACOS-6, which has a low-toxicity immune-activating properties, animal experiments have confirmed that the substance can inhibit the proliferation and metastasis of cancer cells. Lu Xun said: ? The first time to eat a crab is very admirable, not a warrior who dares to eat it? Crabs have terrible shapes and pincers, so it takes some courage to start eating crabs. But it can be said with certainty that the Chinese nation is the earlier know how to eat crabs of the nation. Zhouli contains? Crab Xu? , is said to be a crab sauce, visible as early as two thousand years ago, crabs have appeared as food on the feast of our ancestors. The Northern Wei Dynasty's Jia Si Fo's "The Essentials of Qi Min" introduced the "Hidden Crab Method" for pickling crabs. Hidden Crab Method , which took the method of eating crabs one step further. Later, Lu Guimeng's "Crab Zhi", Fu brachy's "Crab Spectrum", and Gao Xisun's "Crab Liao" were all monographs about crabs, and the Chinese people's knowledge of crabs was enriched even more. Distribution of hairy crabs