What are the common varieties of shrimp seedlings? What are the methods of raising seedlings?

Crayfish as the "king of midnight snacks", good taste, high nutrition, in people's demand for food is still relatively strong. Although the crayfish market has ups and downs in recent years, but as a traditional aquaculture industry, its heat has been high. In order to achieve the purpose of culture and improve the income of culture, the management of shrimp fry cultivation stage is particularly important. So how to raise shrimp seedlings? What are the common varieties? Let's get to know it.

What are the common varieties of shrimp seedlings?

1. Australian freshwater crayfish seedlings: this species is suitable for large area farms and needs to spend the winter in winter.

2. Shrimp seedlings: this species is suitable for breeding in fish and shrimp ponds without a winter shed in winter. The position of salty and fresh water is the best, catching shrimp on the market during the Spring Festival.

3. Japanese flower shrimp seedlings: this variety can be used in June and July, requiring more than 7 squares of salt water and a silica sand bottom. if it is managed properly, the harvest is still good.

4. Macrobrachium rosenbergii seedlings: when it is difficult to cultivate Penaeus vannamei, this species is a good alternative and supplementary species.

5. South American clay seedlings: this variety is suitable for soil pond culture, especially mixed culture, because the price of soil seedlings is lower and the risk is less, so it can be used as a complete set of culture.

6. Crayfish seedlings: crayfish, as a new bright spot of aquaculture in South China, whether it is breeding technology or market consumption, it is believed that most farmers are more aware of it.

What are the methods of raising seedlings?

1. Prepare the pond

Be sure to make preparations for the pond before releasing the shrimp fry. First of all, the pond must be cleaned and maintained, and it is best to turn the bottom. At the same time, the pond mouth should be disinfected, cleared, killed natural enemies and disease sources, and thoroughly filtered when entering the water to prevent natural enemies and competitive creatures from sneaking into the pond. Aquatic plants should be complete, floating plants, submerged plants, water plants had better be able to take into account, the area of about 60% of the whole pond, can also appropriately increase artificial shelter.

2. Seedling release operation

Whether the water quality index meets the requirements is tested again one or two days before release, the first is salinity, the salinity of the seedling farm is 18 grid, the suitable salinity range of shrimp seedling is 18 ±2 grid, the second is temperature, the optimum growth temperature of shrimp seedling is 28032 ℃, and the last is release time, it is best to choose morning or evening and keep the water temperature above 25 ℃, during this period, the temperature and air pressure are relatively low and closer to the transport environment of shrimp fry.

Shrimp fry usually come out in P4 stage, which is bound to produce stress after nearly 20 hours of transportation. One hour before entering the pond, adjust inflation to reduce the injury of shrimp fry, sprinkle VC or polysaccharide anti-stress drugs in the whole pond and supplement palatable bait in time to reduce the stress reaction of shrimp fry and restore their physical strength. According to the stocking density planned by the water volume of the culture pond, the rearing density of shrimp fry generally ranges from 5000 to 70, 000 tails per square meter of water. The cultivation time and management should be based on personal habits and experience.

3. Seedling management

The activity of shrimp seedlings was observed by 20min after release. If the shrimp seedlings sink to the bottom or swim against the current, the shrimp seedlings can be fed 1-2 hours after release, Artemia nauplii or Prawn Crackers, and the initial feeding amount is ten thousand 5g/ and ten thousand 1g/ respectively. It is necessary to change water and adjust salinity within 1 week after seedling release, and the stress is large, so it is necessary to supplement brine to strengthen the physique.

4. Late cultivation.

In the process of cultivation, change the water once every 7-10 days, change the pool water 1 stroke 3 each time, keep the dissolved oxygen content of the pond water more than 5 mg / L, and sprinkle it with 20 grams of quicklime water every 20 days or so to regulate the water quality and increase the content of free calcium in the water, and provide the calcium needed for the growth of shrimp seedlings during molting. After 25-30 days of cultivation, the shrimp seedlings can reach 3 cm in length after 5-8 times of growth and molting.

Generally speaking, the breeding and cultivation of shrimp seedlings is relatively simple for veterans, and can reproduce shrimp seedlings on their own, which can save a lot of introduction costs. However, in order to improve the reproduction rate and survival rate of shrimp seedlings, it is far from enough to rely on experience alone. only when all the key links are linked up, can we ensure that the release and cultivation of shrimp seedlings can be carried out smoothly.

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