Will crabs drown if they stay in the water?

Crabs can't be drowned. It won't drown, because it breathes through its gills, so it can breathe freely in the water. It can breathe not only in water, but also in air, just to ensure enough oxygen. The crab's gills can store some water, so that it can breathe after landing. But the gills of crabs are different from those of fish. Its gills look like silk.

There are many kinds of crabs. There are about 600 kinds of crabs in China, including swimming crab, blue crab, frog crab and Guan Gong crab. Because of different geographical locations, there are also grades. The first category is lake crab, such as Yangcheng Lake and Jiaxing Lake. The second category is river crabs, such as Jiujiang and Wuhu; The third category is river crabs; The fourth category is crabs; The fifth category is the ditch crab; The sixth category is sea crabs.

Crab culture

1, enough water plants

In summer, some aquatic plants such as water peanuts and duckweed should be raised in the crab pond, or some emergent plants such as reeds and water bamboo should be planted to provide a cool habitat for river crabs. The area where aquatic plants are installed or planted in crab ponds generally accounts for about 30% of the whole pond area. Too much should be harvested in time and too little should be replenished in time. At the same time, rotten aquatic plants should be fished out in time to avoid deteriorating water quality and breeding germs.

2. Freshwater quality

The crab pond should always check the water quality, change the water frequently, remove leftovers and dirt in time, and keep the pond water clean. The water depth must be kept above 1 m to prevent hot water from scalding crabs. Generally, the water is changed from night to the next morning 10, every 3-5 days, with a depth of about 5 cm each time. The water source must be clean and pollution-free.

In order to increase the content of calcium ions in the water body when the crab molts, generally, 5 ~ 10 kg of quicklime is used per mu of water surface, and it is sprinkled in the whole pond once every 15 ~ 20 days after watering, which is beneficial to the healthy growth of the crab.