The place suitable for raising crabs has good water quality, sufficient water and convenient drainage. In order to ensure good air permeability, sand or sandy soil should be the main material. The water depth in the pond should be controlled at about 1m, and the shallowest part should not be lower than 10cm.
Leave a few mounds in the completed pond and plant aquatic plants such as reed, water bamboo and calamus. On the one hand, these aquatic plants are good sources of nutrition for crabs. On the other hand, it is beneficial to consolidate the river bank and avoid digging holes and leaking water.
Extended data:
management measure
Crab feeding management, river crabs like to eat fresh ingredients. Therefore, daily feed management prohibits those feeds that have been stored for a long time and deteriorated. At present, it is still necessary to give priority to meat feed, and use some nutritious vegetarian food in moderation, especially plant feed, to ensure good water quality in the pond.
The amount of materials used should depend on the change of climate and temperature. In hot summer, feed 1 ~ 2 times. The exact quantity depends on the weight of the river crab. If there is unfinished residue, it should be salvaged immediately to avoid deterioration and influence on water quality.
Crab breeding management, strengthen daily feeding management, and implement daily inspections. Patrol at least 1 ~ 2 times a day, once in the morning and once in the evening, and pay attention to the feeding situation of river crabs. In case of abnormal conditions, it is necessary to immediately check whether there is any disease, and actively use drugs to prevent the spread of infectious diseases from affecting the breeding efficiency.
With the increase of the number of aquaculture, water hypoxia happens from time to time, so it is necessary to change water and increase oxygen in time to reduce the high mortality caused by hypoxia. In addition, it is necessary to check whether there are any loopholes in the pond, do a good job of blocking and preventing the invasion of natural enemies, and avoid the situation of escape.
The disinfection management of crabs can eliminate germs and bacteria in ponds and create a good breeding environment for the healthy breeding of river crabs. Disinfection management of ponds should be done well before and after breeding. When young crabs enter tang qian, they should be disinfected in advance, and the mud in the pond should be cleaned in time in winter. In the process of aquaculture management, the disinfectant selected should be low in toxicity and quick in volatility to avoid environmental damage caused by disinfection.
Reference: Baidu encyclopedia-crab