CATDOLL : CATDOLL: Can swimming crab seedlings be fed after metamorphosis?

1. Can swimming crab seedlings be fed after metamorphosis?

Swimming crab fry can be fed after metamorphosis.

1. Preparation before planting seedlings

1. Specifications of enclosure net for bird infiltration: The enclosure range is about 1 to 2 acres, the mesh size is 10 to 20 meshes, and the water depth of the shovel net is about 0.5 to 1.5 meters.

2. Water quality requirements: The best daily average pond water temperature is above 15°C, the nitrite is between 0.05mg/L and 0.5mg/L, the salinity is between 15‰ and 30‰, the pH is between 8.0 and 8.6, and the water contains a certain amount of beneficial algae.

3. Tools: If conditions permit, an oxygenator can be installed in the pond enclosure, using a PV pipe rack to connect the leather pipe and air stone.

2. Breeding methods after seedling release

1. Number of seedlings released: The number of seedlings released by the enclosure is related to the total area of ​​the pond. Based on the total area, the number of second-phase swimming crab seedlings released per mu is approximately 1,500 to 3,000.

2. Breeding methods and feed: The feed is mainly Artemia, clams, and chopped small fish meat. It can be fed with synthetic feed for swimming crab seedlings. The daily feeding amount is 30%-40% of body weight, once in the morning and evening, and can be supplemented once in the early morning. If there are fresh clams, you can feed more, about 1 to 2 bags every 3 to 6 days.

3. Notes:

1. Observe the metamorphosis of the spindle-shaped crab seedlings.

2. Observe the amount of bait.

3. Observe whether the swimming crab seedlings have signs of hypoxia.

2. How to improve the survival rate of swimming crab seedlings at the critical moment of swimming crab breeding

1. Strengthening cultivation Selecting swimming crabs cultivated in ponds as parents for strengthening cultivation in winter can not only ensure the quality of the parents, but also be unaffected by the market and sea conditions. Build a small shed as a cultivation pond. The bottom of the pond should be covered with a layer of sand about 375px, and equipped with oxygenation equipment and heating equipment. After the parent crabs enter the pond, feed them with fresh bait and change the water in time. 2. Prevent injuries Whether catching swimming crabs in the sea or in the pond, the movements should be light and fast, and the claws should be tied with thin rubber bands to prevent mutual killing. For short-distance transportation, they can be covered with wet straw and wrapped in a heat preservation box for transportation.

3. What should we pay attention to when breeding young swimming crabs?

1. Pond Selection and Preparation

1. The ponds in the Haiken area are east-west oriented and have a muddy bottom, which is suitable for the cultivation of young swimming crabs. The infrastructure such as water, electricity, and roads are complete, the water inlet and outlet are convenient, the pond embankment is solid, and the water depth is maintained above 1.2m. There are 3 ponds in total, covering an area of ​​150 acres.

2. Preparation before stocking seedlings:

① The pond was fully desilted and a ditch was dug around it with a width of 8m and a depth of 60cm.

② Thoroughly fill in gaps, leaks and reinforce the pond embankment, and expose it to the sun at the same time.

③ Disinfect the pond. Choose sunny weather for disinfection. Drain the pond water after 3 days. After 2 days of sun exposure, allow water to enter the pond at tide so that the shallowest water level is not less than 35cm. Then apply urea, superphosphate, and compound fertilizer to cultivate algae and plankton to provide the necessary basic bait for the release of crab seedlings.

2. Seedling placement

1. Stocking time: It is better to stock crab seeds early rather than late to extend the breeding period and improve the size of crabs.

2. Crab seedling selection: choose those with good vitality, strong individuals, no disease or disability, and intact bodies.

3. Stocking method: In order to increase the survival rate of crab seedlings, it is generally chosen to release the seedlings when the temperature difference between morning and evening is relatively small and the adaptability of the crab seedlings is relatively strong.

4. Stocking density: The stocking density should be based on the pond area and the size of the seedlings. About 5,800 to 6,500 seedlings should be stocked per mu.

3. Daily Management

1. Feeding: The bait mainly consists of small fish, small shrimps, shellfish meat and dried fish. Feed once in the morning and evening every day for the first 5 days after stocking, with a daily feed of 40 to 60 kg. After 15 days, the daily feed amount is 80 to 160 kg, and then gradually increase with the growth of individual crab seedlings.

2. Pond inspection and production record: Pond inspection is a very important task during the breeding period. In the early morning and evening, the water inlet and outlet gates, rubber flat nets, barriers, and lattice dikes must be carefully inspected. Closely observe the changes in pond water quality and the growth and activities of crab seedlings, and keep daily production records, such as water quality changes, feeding amount and frequency, weather, water change amount, crab seedling activities and growth, etc.

4. Disease prevention and control

Swimming crabs have strong disease resistance and rarely get sick. However, in summer, when the temperature is too high and the water change is insufficient, the water quality deteriorates and the transparency is low, the crab's shell is prone to parasites, which will directly affect the growth and molting of the crab, and in severe cases, cause death. In order to prevent this from happening, the water change must be appropriately increased, and quicklime, bleaching powder or tea seed cakes must be sprinkled regularly, which can not only disinfect and prevent diseases, but also help the crab molt and grow.

5. Capture Methods

① Drainage and catching method: Drain the pond water, then use an iron rake to slowly rake along the bottom of the pond, pick up the crabs, and catch them with a hand net.

② Crab cage collection method: Fix a bamboo pole 15m away from the dam in the pond, use a rope to pull the crab cage into the pond, and put some hiding objects in the crab cage. Collect the net once every 2 hours.

Swimming crabs with three tubercles are large crabs that grow in the ocean. They are rich in nutrients, so they have been favored by many consumers in recent years. However, in fact, in the process of breeding swimming crabs with three tubercles, various technical difficulties are often encountered. If certain breeding details are ignored, it is likely to lead to a phenomenon of reduced or even complete crab production. Swimming crabs with three tubercles have relatively strict overall requirements for the growth environment. Therefore, as a technician in crab farming, it is necessary to closely combine the crab farming of each process and improve crab farming in accordance with the basic idea of ​​adapting measures to local conditions. Up to now, the efficient seedling breeding and steady-state production breeding technology involved in breeding swimming crabs with three tubercles has been comprehensively improved, but it has not been truly perfected. In the future, in practice, technicians still need to summarize their experience and serve the overall level of the swimming crab farming industry under this premise.

The first point you need to pay attention to is the temperature during the breeding process. The second point is that you should change the water regularly, otherwise it will die. The third point is that this seedling is very difficult to raise. You should control the temperature well and spray some medicine regularly.

The swimming crab is a member of the Crustacea, Decapoda, and Portunidae family. It is large in size and is commonly known as swimming crab, white crab, and crab. It is an important economic crab species along the coast of my country. The swimming crab has delicious meat, rich nutrition, fast growth, and strong environmental adaptability, making it an important breeding species. So what issues should we pay attention to in the breeding of swimming crabs? Today, let us walk into the breeding world of swimming crabs.

You need to pay attention to the water conditions. When breeding, you must pay attention to the selection of varieties and the fluidity of the water.