The pond area of 4 to 10 acres is appropriate, the depth of 1 to 1.5 meters, the slope ratio of 1:2.5. The bottom of the pond is flat, the substrate to loamy soil is good, the slope of the pool of the soil is hard, the pond retains water, water level is easy to regulate. The water source is sufficient and the water quality is not polluted. In accordance with the pattern of high irrigation and low drainage, build a good intake and drainage canal, so that irrigation, drainage. Crayfish escape ability is strong, must improve the construction of anti-escape facilities. Usually with plastic film or calcium-plastic plates, along the ridge around the bamboo or wooden stakes to support the fence to prevent escape.
Two, stocking preparation
1, thoroughly clean pool disinfection shrimp seed stocking shrimp fry before 20 ~ 30 days, drain the pool, remove too much silt, refurbishment of the ridge, 75 kilograms of quicklime per acre, or bleaching powder, bleaching powder, such as drugs, thoroughly clean pool disinfection.
2, the full basal fertilizer per mu of rotting animal manure 500 to 600 kg, cultivate rotifers and branch angle class, copepods plankton, shrimp fry shrimp species to provide palatable bait.
3, planted aquatic plants in the pool planted rotifers black algae, Malayan eye, Ileaginous algae and other aquatic plants, the area of shrimp pool area 2 / 3. At the same time, set up mesh, or set up bamboo tubes, plastic tubes, etc., for the Crayfish to provide habitat, moult, hiding place.
Three, shrimp fry shrimp seed stocking
1, breeding mode can be used in a variety of breeding modes. (1) summer stocking mode. To stock the first batch of young shrimp hatched in the year mainly, stocking time in mid to late July, young shrimp specifications for more than 0.8 cm. Stocking 30,000 to 40,000 tails per mu. (2) fall stocking mode. Cultivated in the year to stocking of large-size shrimp fry or shrimp species-based, stocking time in mid-August to September. Shrimp fry specifications of 1.2 cm or so, stocking 25,000 to 30,000 tails per mu; shrimp species specifications 2.5 to 3 cm, stocking 15,000 to 20,000 tails per mu. A small portion of the end of the year can be marketed specifications, most of the following year to June to July fishing market, commercial shrimp weighing only 25 grams, mu yield of 300 to 500 kilograms. (3) winter and spring stocking mode. Generally in December or the following year, March to April stocking. To stock the year does not meet the listing specifications shrimp-based, specifications for each kilogram of 100 to 200, per mu stocking 15,000 to 20,000 tails. After the winter and spring breeding, to 6 ~ July catch and market, commercial shrimp weighing up to 30 grams, mu yield 400 ~ 500 kilograms.
2, seed quality shrimp fry shrimp seed quality requirements are: (1) neat specifications. Juvenile shrimp specifications in 0.8 cm or more, shrimp species specifications in about 3 cm. The same pond stocked shrimp fry shrimp species specifications to be consistent, a put enough. (2) robust, complete appendages, disease-free and injury-free, strong vitality. (3) Shrimp fry shrimp species are artificially cultivated. If it is a wild shrimp species, it should be released after a period of time after domestication, so as to avoid mutual fighting and killing.
3, notes: (1) winter stocking choose a sunny day in the morning, summer and fall stocking choose a sunny day in the morning or rainy day, avoid sun exposure. (2) shrimp seed stocking with 3% to 5% salt water bath for 10 minutes before stocking, kill parasites and pathogenic bacteria. (3) shrimp species purchased from abroad, because of the long time away from the water, should be slightly treated before stocking. Shrimp species in the pool water immersion for 1 minute, lift and set aside 2 to 3 minutes, and then immersed for 1 minute, and so on 2 to 3 times, so that the shrimp species of the body surface and gill cavities to absorb enough water before stocking, in order to improve the survival rate. (4) feeding crayfish pond, appropriate mixing some bighead carp, to improve water quality, make full use of bait resources.
Four, scientific feeding
Chelidonian crayfish miscellaneous diet, and more gluttonous. Feed feeding, grasp the following three points.
1, in accordance with the crayfish with the long development stage of nutritional needs, to improve the combination of feed and feeding. Crayfish baby shrimp, juvenile shrimp stage, to rotifers, branching horns, copepods and aquatic insect larvae, etc. for food, adult shrimp stage of animal feed, plant feed. Shrimp seedlings, shrimp seed stocking, to timely application of fertilizer, fertilization of water quality. In August to October Crayfish rapid growth stage, feed more bran, soybean cake and green feed, appropriate feed to animal feed. 11 to December Crayfish wintering, to feed animal feed.
2, according to the crayfish habits and feeding characteristics of feeding. Crayfish crayfish in the night activities for food, and has a competition for food, gluttony habits. Feeding feed to adhere to the daily morning, afternoon feeding once, mainly in the afternoon, accounting for 70% of the day's feeding; take quality, quantity, timing feeding methods, feed enough to feed evenly, to ensure that each shrimp are full, to avoid competing with each other for food.
3, according to the weather, water quality changes and shrimp activity feeding situation reasonable feeding. Crayfish growth of suitable water temperature of 20 ~ 32 ℃. In August to October crayfish feeding, daily feeding can be arranged according to the weight of the pool shrimp 6% to 10%, dry feed or feed according to 2% to 4% co-ordination, and according to the weather, water quality and shrimp activity feeding situation appropriate increase or decrease. Continuous rainy weather or water quality is too thick, you can feed less, when the weather is good, more appropriate feeding; a large number of shrimp moult less feeding, more feeding after moult; shrimp onset of the season less feeding, more feeding when the growth is normal. Both to let the shrimp eat well, but also to reduce waste and improve feed utilization.
Five, daily management
1, the establishment of the pool inspection system. Daily inspection of the pool, found abnormalities in a timely manner to take countermeasures.
2, regulating water quality. Maintain the shrimp pool dissolved oxygen in 5 g / liter or more, pH value of 7 ~ 8.5, transparency of about 40 cm. Every 15 to 20 days to change the water, each time the water 1/3. every 20 days to splash a lime water, each time 10 kilograms of quicklime per mu. Keep the water level stable, not high and low.
3, strengthen the habitat moulting place management. Shrimp pool always keep more aquatic plants. Large numbers of shrimp molt is strictly prohibited interference, immediately after the molt to increase the feeding of high-quality palatable feed, to prevent each other, to promote growth.
4, escape prevention and disease prevention. Flood season to strengthen the inspection, to prevent the escape of shrimp. Do a good job of disease control and enemy removal.
VI, commercial shrimp fishing and transportation
1, fishing. Can be in June to July and November to December to focus on fishing. The first land cage net, hand net and other tools to catch, and then finally dry pool capture. You can also catch big and leave small, year-round fishing.
2, transportation. Commodity shrimp usually dry shipping with Styrofoam boxes, can also be shipped in plastic bags, or refrigerated trucks. Transportation to keep the shrimp body moist, do not squeeze, in order to improve the survival rate of transportation. China Organic Agriculture Network