Conditions of adult crab culture pond:
Convenient transportation, quiet environment;
Abundant water, good water quality pollution-free, convenient drainage and irrigation;
The bottom of the pool is flat, and the slope ratio of the pool stem is 1:2.5-3
Escape prevention measures:
There are mainly cement brick wall, calcium plastic board fence, polyethylene mesh fence in three forms. At present, calcium-plastic fence is widely used. The calcium-plastic fence is buried 500px in soil around the ridge, and is fixed with wooden piles one meter apart.
◆ Sterilization and disinfection:
Remove too much silt, leaving only about 250px silt, with the whole pool of quick lime splashing, 200-250kg per mu dosage, in order to achieve a thorough disinfection of the pond, in addition to the impurity in addition to the wild, killing bacteria, improve the substrate, 7 days after medicine, that is, water 1 times, in order to eliminate dirt, and then sun pond 3-5 days after adding water.
◆ Selection of crab species:
It is advisable to select the species of Eriocheir sinensis with neat specifications, complete appendages, no disease, no injury and quick movement in the Yangtze River system.
◆ Scientific and reasonable bait casting:
River crab is a kind of omnivorous animal. In bait feeding, the scientific bait feeding method of "four determination and four observation" is strictly implemented, and the principle of "fine in the early stage, green in the middle, meat and vegetable combination" is mastered. Feed the crab once in the morning and once in the evening. The daily feeding amount generally accounts for 3-4% of the crab's body weight, and it is advisable to eat it within 1-2 hours.
In the stage of promoting fat gain, plant concentrate feed and animal feed should be increased to ensure that crabs eat well.
◆ Crab pool water quality control:
Generally, the water depth is kept at 0.6-0.8m, and the temperature season is adjusted to 1-2m. Water quality
Regulation focuses on three aspects:
Frequently change new water, generally 7-10 days to change water, high temperature water injection 10-500px every day, 3 days to change water.
It is to adjust the pH of the water body, generally master between pH 7.8-8.5. The main use of quicklime regulation, 7-10 days the whole pool pouring once, each mu each meter of water depth in the amount of 10-15kg.
Is to use photosynthetic bacteria to regulate the water quality, the amount of 3-5kg per mu, the whole pool pouring, in order to transform the water of ammonia nitrogen hydrogen sulfide and other harmful substances, control the breeding and reproduction of harmful bacteria.
