CATDOLL : CATDOLL: Can crabs be raised in fresh water?

1. Can crabs be raised in fresh water?

Crabs can be raised in fresh water. Except for a few sea crabs, most crabs live in fresh water areas.

Crab (scientific name: Brachyura) is a crustacean with a wide distribution. In biological taxonomy, it is the same species as shrimps, lobsters, and hermit crabs. Common crabs include hairy crabs (river crabs, hairy crabs, clear water crabs), swimming crabs, etc.

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2. How to breed hairy crabs

The Chinese hairy crab is a kind of river crab, and its scientific name is Chinese mitten crab. It is widely distributed along the long coastline of my country from Liaohe River in the north to the Pearl River in the south. Among them, the Yangtze River system has the largest output, the most delicious taste, and rich nutrition. To breed hairy crabs, you need to select some excellent crab seedlings with high survival rate for breeding. It is recommended to use lake water breeding, select and maintain an area with high water quality as the breeding area, and set up fences and sluices. After that, plant some aquatic plants in the water to improve the water quality, and put the crab seedlings in it. When breeding, it is necessary to feed with live small fish regularly, so as to ensure that the hairy crabs get sufficient nutrients and grow better.

For specific details, you can find technical posts on the Internet for reference.

1 Hairy crabs are lake crabs and can be farmed in freshwater. Just find a water area connected to the lake, renovate it into a pond, take drainage measures to prevent it from crawling away, and then select hairy crabs with vigor and good quality and put them in the pond. Then feed them some small fish, shrimps and other foods, and properly cultivate some aquatic plants to ensure the survival of the hairy crabs. How to keep hairy crabs alive at home for a few days 2 Generally, the hairy crabs you buy home will be eaten as soon as possible within a short period of time. There is no need to keep them according to the above method. You can take the following measures to keep them temporarily: 1. Refrigerate: 3 days (1) Select hairy crabs with vigor and touch their eyes with your hand. If they are not sensitive, eat them first. Do not keep them any longer, otherwise they will die easily. (2) Tie the hairy crabs' feet and claws with cotton ropes or palm leaves to reduce the hairy crabs' physical consumption. (3) Then put them in the refrigerator's freezer and control the temperature at about 5-10 degrees Celsius. (4) Cover the crab with a wet towel to keep the crab moist and hydrated. (5) Observe the crab every day. Pick out and eat the crabs that are not vigorous enough. The crabs with sufficient vitality can be kept. 2. Temporary storage in a plastic bucket/basin: 3-5 days (1) As in the first step of the refrigeration method, pick out the crabs with good vitality first. (2) Put the crabs into the plastic bucket/basin one by one, without stacking them. (3) Then add water to half the height of the crab's body to moisturize it, but the water cannot cover the crab completely, otherwise it will die of lack of oxygen. (4) The bucket/basin does not need to be covered, just put it in a cool place. Check the crabs every day and eat the crabs that are not vigorous enough as soon as possible. Usually, when the temperature is not high, the crabs can be kept for more than 5 days. 3. Temporary storage in a bathtub: more than 7 days or longer (1) Similarly, pick out the crabs with good vitality first. (2) Gently pour the crabs into the bathtub. (3) Add water until the crab can stand up on its eight legs and breathe on the water surface. (4) Add a small amount of small fish and shrimp according to the storage time and quantity. This method can generally store crabs for more than 7 days or even longer. The survival rate of good quality crabs can reach more than 95%. What kind of water should be used to raise crabs? 3 Lake water or river water. Hairy crabs are not seafood, but a type of lake crab. They only need fresh water. Usually, water in waters connected to rivers and lakes is fresh water. You can get some of it to temporarily raise crabs, but don't add salt to it like raising sea crabs. If the salt concentration is too high, it will accelerate the death of crabs. At the same time, don't use tap water, because it contains harmful substances such as chlorine, which will also cause the rapid death of crabs. The water temperature for temporary raising crabs is 4 not less than 5 degrees Celsius at room temperature. Hairy crabs will hibernate at a temperature of 5 degrees Celsius. If the temperature is lower, the hairy crabs will be at risk of frostbite. Therefore, in order to ensure the freshness of the hairy crabs during temporary storage, the temperature should be adjusted above 5 degrees Celsius, and the optimal temperature is around 15 degrees Celsius.

3. Can I add salt to fresh water to raise small crabs? I heard that they can't survive in fresh water.

The Buku Xiaona can be cultured in fresh water.

The scientific name of the sea crab is: Portunus trituberculatus.

For sea crabs to survive, there must be a lot of sodium ions in the water. On the other hand, the permeability and rolling resistance of sea crabs themselves are relatively high. If sea crabs are directly farmed in freshwater, they will easily die due to pressure changes. Therefore, sea crabs need to be farmed without salt water. You can go to the market to buy special breeding and sea salt. Or you can use seawater for farming.

Water quality requirements for breeding sea crabs: the water temperature should be above 18°C, the daily temperature difference should be less than 8°C, the salinity should be 18-32, the pH value should be 7.8-8.6, the ammonia nitrogen content should be less than 1 mg/L, the dissolved oxygen in the water should exceed 5 mg/L, and the water transparency should be maintained at 30-40 cm.

Expansion and promotion information:

Salinity control for crab farming:

The suitable salinity is 13-38, and the most suitable salinity for growth is 20-35. The salinity for wintering is 28-35. If the salinity is lower than 8 or higher, they will stop eating and moving, and all will die after one day.

Marine crab breeding precautions:

1. Clean the pond

The consolidation of a pond mainly involves removing excess silt from the bottom of the pond, loosening the bottom of the pond and exposing it to the sun, and maintaining supporting facilities such as pond embankments, gates, and canals.

2. Prevention and treatment of bacterial diseases

To prevent the spread of bacterial diseases, breeding management should be strengthened, mechanical damage should be avoided, and sick crabs should be removed in a timely manner.

Reference source: Baidu Encyclopedia - Swimming Crab

4. Can crabs be raised? How to raise them?

Container: You can use fish tanks or basins to raise crabs. It is best to have a cover and the water should not be too deep. Feeding: You can feed crabs with small fish, shrimps, egg yolks and other foods. The amount of food each time should not be too much. Water quality: Freshwater crabs should be raised in fresh water, and sea crabs should be raised in sea water. It is best to change the water once a week. Water temperature: It needs to be kept above 15 degrees. Sunbathing: You can let them bask in the sun, but the time should not be too long. Cleaning: Clean the crab's body and container regularly.

1. Can crabs be raised? Crabs are an animal that we are very familiar with, and they can also be raised. Raising crabs is not particularly simple, and there are many issues that need to be paid attention to. For example, many factors of the water environment, feeding, and sunbathing, etc., all need to be done well, otherwise it will affect the growth and development of crabs, and even cause their death.

2. How to raise crabs 1. Container: To raise crabs, you first need to prepare a container. You can use a fish tank, and it is best to have a cover to prevent the crabs from running out. A basin is also OK, so as to prevent the water from being too deep and causing harm to the crabs. You can also put some sand in the water. When you first start raising crabs, they will not be able to adapt, but they will be fine after a few days.

2. Feeding: Feeding crabs is also an important task. There are many simple foods that crabs can eat. The most common ones are small fish and shrimps. In addition, there are egg yolks, red nematodes, etc. You can also let them eat some grass. Each time you feed them, let them finish eating within half an hour. Don't feed them too much, which will cause too much food to remain in the water and easily make the water dirty.

3. Water quality: It is relatively convenient to breed river crabs. You can get some river water or lake water, or you can use tap water at home directly. However, tap water needs to be exposed to the sun before use. It is more troublesome to breed sea crabs, because they generally cannot adapt to freshwater environment, and they need to simulate seawater environment. During the breeding process, the water also needs to be changed regularly, generally once a week.

4. Water temperature: Water temperature has a great impact on the appetite of crabs, so it is best to keep it appropriate. Generally speaking, it is more suitable to keep it above 15 degrees, as they have a strong appetite and grow better.

5. Sunbathing: You can let them bask in the sun for a while, but not for too long.

6. Cleaning: When breeding crabs, you need to clean their bodies regularly. You can fix their bodies first, and then use tools such as toothbrushes, shower gel or soap to scrub their bodies. The container can also be properly cleaned to prevent the crabs from getting sick.