How to raise crabs for the winter

Most species of crabs live in the sea or offshore areas, and some live in fresh water or land. At present, the number of artificial breeding is also relatively large. So, how to raise crabs for the winter?

First, how to raise crabs for the winter?

Clean up the silt in the pond in time and do a good job in disinfection management. Check the pond for loopholes, take preventive measures to avoid the invasion of natural enemies, but also avoid escape. Animal feed is mainly fed, supplemented by plant feed, of which animal feed accounts for 6070% of the total feed. Inspect them once or twice a day to pay attention to their foraging. When the water temperature is lower than 10 ℃, the feeding amount is reduced by 30.5% until hibernation stops feeding.

2. Culture techniques of crabs

1. Build a farm

In a suitable crab breeding ground, the water quality is good, the water source is sufficient, and the drainage is convenient. In order to ensure good air permeability, sandy land or sandy loam should be given priority to. The depth of water in the pond is controlled at about 1m, and the shallowest place can not be lower than 10cm. Built ponds, leaving several mounds, planting Reed, Zizania caduciflora, calamus and other aquatic plants. On the one hand, these aquatic plants are a good source of nutrients for crabs to eat. On the other hand, it is helpful to consolidate the river embankment and avoid water leakage caused by hole digging.

2. Variety selection

Variety is the key to achieve high yield. At present, most of them are the seedlings of Eriocheir sinensis. At the same time, to ensure a strong physique, neat specifications, but also have a good ability to adapt. Select good crab seedlings, first soak them in the pool for a few minutes, operate repeatedly for several times, observe the adaptability of crabs to water quality, and put them in when there are no adverse reactions. At present, the mixed culture of crab fry and other fish species is mainly used to provide a source of food for crabs on the one hand and improve the economic benefits of culture on the other.

3. Feed

To ensure that the food is fresh, mainly to put meat feed, appropriate amount with some vegetarian nutrition, especially some plant feed, so as to ensure the good water quality of the pond. The number of materials used should be determined according to the change of climate and temperature. In the hot summer, you can feed it once or twice. The specific number depends on the weight of the crab. If there is any unfinished residue, it should be salvaged immediately to avoid deterioration affecting the water quality.

4. Guard against escapes and natural enemies

Implement the daily inspection work well. Make at least one or two inspections a day, once in the morning and once in the evening, to pay attention to the foraging of river crabs. When there is an abnormal situation, we should immediately check whether there is a disease, so that we can actively use symptomatic medicine to avoid the spread of infectious diseases and affect the efficiency of breeding. With the increase of culture quantity, water hypoxia occurs from time to time, so the work of changing water and increasing oxygen should be done in time to reduce the high fatality rate caused by hypoxia. In addition, we should also check whether there are loopholes in the pond, do a good job to prevent the invasion of natural enemies, but also avoid escape.

5. Disinfection management

Remove germs and bacteria in the pond to create a good culture environment for healthy breeding of river crabs. The disinfection management of ponds should be done well before and after culture. Before entering the pond, the young crabs should be disinfected in advance and clean up the silt in the pond in time.

Crabs also hibernate in winter, so it is important to do a good job of daily inspection.