Crayfish culture technology

Lobster culture technology training includes: seedling density, pond cleaning and disinfection, shrimp seedling selection, aquatic plant planting, feeding principle and disease prevention.

1, seedling density

No matter what kind of culture mode, the density of lobster culture must not be too high. Even the intensive culture density of Tangkou should be controlled at 80 ~ 100 kg per mu, and the density of polyculture mode should be reduced to 50 ~ 60 kg per mu.

High-density seedling raising will bring great pressure to pond environment and management. It is easy to cause the specifications of lobsters to be too small, and shrimps are easy to die due to factors such as lack of bait, poor breeding environment and lack of oxygen.

2, pool cleaning and disinfection

Cleaning and disinfection of ponds can effectively kill harmful organisms in ponds, such as catfish, snakehead, snakes and rats, wild miscellaneous fish competing for food, such as carp and crucian carp, and pathogenic bacteria. Commonly used methods include lime disinfection, dry lime disinfection and water disinfection.

Dry disinfection method: use 50- 100kg of quicklime per mu, sprinkle it all over the pond, dry the pond for 3-5 days, and then pour in fresh water. Disinfection method with water: the water depth per mu is 1 m, and after being dissolved in water with 125 to 150kg, the quicklime is evenly sprinkled all over the pond.

3. Selection of shrimp fry

Choose shrimp seedlings with neat stocking specifications, strong physique, complete appendages, clean body surface, no injury, no disease and strong activity, and local high-quality shrimp seedlings are the best.

4. Planting of aquatic plants

Aquatic plants are natural bait for lobsters, which provide them with a place to live, shed their shells, provide shade and avoid enemies. At the same time, they can also increase dissolved oxygen, reduce temperature, adjust and purify water quality and improve sediments.

At present, the common aquatic plants are Elodea nuttallii, Hydrilla verticillata, Ceratophyllum crispus, Potamogeton crispus, millet grass, Alternanthera philoxeroides and so on.

5. Feeding principle

Feed feeding adheres to the principle of "five fixed", and is adjusted according to the season, weather, water quality and shrimp activities, and a food table is set up to observe the feeding situation of lobsters.

Lobster's diet is mixed. At the early stage of seedling release, rotifers, cladocera, copepods or aquatic animals in ponds were fed artificially with small miscellaneous fish and minced meat.

Feeding animal feed, artificial compound feed and small miscellaneous fish and other plant feed in the middle and late stage.

6. Prevention and treatment of diseases

Sterilize the water regularly, and spray quicklime slurry 10 to 15 kg every 667 square meters every 10 to 20 days. If sick shrimp is found, it should be diagnosed in time and treated with drugs that meet the national fishery drug standards. Never use drugs blindly.