Crab farming technology

Crab farming pond conditions: convenient transportation, quiet environment; abundant water, good water quality, pollution, drainage and irrigation convenience; pool bottom formation, pond slope ratio 1:2.5-3. Anti-escape facilities: There are mainly three forms of cement brick walls, calcium-plastic plate fences, and polyethylene mesh fences. At present, calcium plastic fences are commonly used. The calcium-plastic composite plates are compacted 20 cm around the concrete in the earthen bowl and fixed at intervals of 1 m with wooden stakes. Sterilize the clear pond: Remove excess silt, leaving only about 10 centimeters of silt, splashing with quicklime, 200-250 kg per mu, to achieve thorough disinfection of clear ponds, cleaning and removing wild and killing germs, improve Substrate, 7 days after the drug, that is, over the water 1, in order to remove the dirt, and then add water after the sun 3--5 days. The plants to be planted in crab ponds: To cultivate a pond crab, we must first plant a pond grass. Water plants are one of the natural foods that crabs love to eat, and they can also play a role in purifying water quality. It is also a habitat for crabs to escape from the enemy. Harmful place. The area of ​​aquatic weeds should account for more than 70% of the area of ​​ponds. The main species include black algae, Vallisneria, Elodea and so on. The black-leaf algae and Elodea species are mainly transplanted and cuttings are introduced, and the plants are planted by sowing. Crab ponds should be placed screws: Screws is one of the crabs like to eat natural food, but also to purify water. Before the stocking of crabs and the market and, put 300-500 kilograms of live screws per mu, in order to cultivate the basic bait of crabs. The selection of crab species: Selection of species with neat specifications, complete appendages, disease-free, injury-free, quick-acting Yangtze River water species of Eriocheir sinensis is appropriate. Crab pond rational stocking: general crab species stocking to achieve "three suitable" and "a temporary raise", namely the appropriate density, timely stocking, moderate specifications and stocking after the first raise. The stocking density of crabs is generally about 500--600 per acre, so that the crabs have ample space for life and growth. The time for the stocking of crabs is generally appropriate from the end of February to March of each year. If the stock is released prematurely, In winter, the number of casualties is heavier. When the water temperature rises too late, some of the crab shells will affect the survival rate of the lower pond. The stocking size of crabs should be 100--200 per kilogram. The size is too large. Each time the first shell is difficult, the damage is heavier; if the size is too small, the growth base is not large, affecting the market specifications. The temporary conservation of crabs is a transitional phase before the stocking of crabs. It is necessary to first set up a “holding zone” in the pool. The length of the holding period should be determined by the water temperature and the growth of aquatic plants in the pond. The area is about 1/5 of the stocking area. Scientific and rational feeding materials: Crab is an omnivorous animal of partial animal feed. In the feeding of bait, strict implementation of the scientific method of "four determinations and four readings" and mastering the principles of "preliminary fineness, intermediate greenness, and meat quality matching". Feed each time in the morning and evening, and the daily feeding amount generally accounts for 3--4% of crab body weight, and it is advisable to eat within 1--2 hours. In the initial stage of stocking, mainly animal feeds, mainly fresh fish, snail meat, etc., and then gradually increase the amount of vegetative concentrate feed, such as wheat, corn, soybean meal, etc., in high temperature season, do not cast For animal diets, less vegetable essence baits, and more crude fodder such as aquatic plants, pumpkins, potatoes, etc., enter the late stage of cultivation, for the river crab to promote growth and weight gain stage, it is necessary to increase the botanical concentrate feed and animal bait to ensure the crab Eat enough to eat. Control of crab pond water quality: Normal water depth is maintained at 0.6--0.8 meters, and high-temperature season is adjusted to 1--1.2 meters. The adjustment of water quality focuses on three aspects: First, constantly changing new water, generally changing the water once every 7-10 days. When high temperature, inject water 10-20 centimeters per day and change the water once every 3 days. The second is to adjust the pH of the water body, generally in the PH value of 7.5--8.5. The main use of quicklime adjustment, 7--10 days Quanchiposa 1 time, the amount of water per acre per meter of about 10-15 kg. The third is to use photosynthetic bacteria to regulate water quality, 3-3-5 kilograms per acre, the whole pool pouring water in order to transform the body of ammonia, nitrogen, hydrogen sulfide and other harmful substances, control the breeding and breeding of harmful bacteria. Crab fishing: Generally entered in October, according to the temperature and market conditions, timely fishing listed, the main tool is the ground cage.

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