Australian freshwater lobster breeding technology (Part 2)

(2) Water quality: Suction sewage 1 times every 1 day to remove residual bait and excreta, every 10～4.Breeding method
(2) Special pond incubation: The picked out egg-bearing shrimp must be raised in a special pool, and the water depth is controlled at about 40 centimeters. The egg-bearing shrimp are isolated and put into the spawning pool, which is composed of an iron frame and a polyethylene mesh with a length of 28～30℃, so that the color of the fertilized eggs gradually deepens from light yellow, yellow, orange, red to dark red. The egg balls are slightly enlarged and elongated, eye spots appear, appendages form, and finally the egg membrane falls off to form juvenile shrimp. 5.Cultivation and management of juvenile shrimps After the spawning frame is removed, the juvenile shrimps should be fed open feed in time in the original pond, twice a day, with compound feed in the morning and palatable animal feed in the evening. The water depth is maintained at 40～60cm, and the water temperature is 25～26℃ in the early stage. When the juvenile shrimps are cultivated to 3. Shrimp cultivation management and methods
After using the dry pond in winter, remove excess silt from the pond, leaving 10~20 centimeters of mature soil. The cleared silt can be used to repair and strengthen the pond ridge. 2.The main method of pond cleaning and disinfection is quicklime, and disinfection must be done 15 days before shrimp are released. 3.The water source at the water inlet and cultivation water inlet is good and pollution-free. The water inlet must be installed with a water inlet filter, generally using 80 mesh sieves. The amount of compound fertilizer used in cement pools is 15～20 per mu, so that the pH value of the pool water is between 7.5～8.5 and the transparency is 4.The shrimp stocking time is from late April to late May. The water temperature is stable at 5.Things to note when releasing seedlings. The water level in the pond when releasing seedlings should be 0.8～6.Proper baiting
When the medium-term specifications are 6～10 cm, the daily feeding rate is 5%, and the daily feeding amount per mu is 7～10 kilograms. (3) Feeding method: generally twice a day, in the morning and evening, mainly in the evening (accounting for 80% of the whole day), and do the " four determinations and four looks7.Water quality management Water quality requires maintaining "fat, refreshing, lively and tender". Microbial agents are used from mid-May to mid-September, and the aerator is activated at noon on a sunny day for 1 to 2 hours to increase dissolved oxygen in the pool and eliminate ammonia nitrogen and other harmful substances in the water. 8.Daily management: Do a good job patrolling the pool diligently. In the morning, you mainly check whether there is any residual bait in order to adjust the amount of bait for the day. Measure the water temperature at noon.9.Prevention and control of enemies and diseases The main enemies include rats, frogs, water centipedes, etc. In normal times, rodent control work should be done in a timely manner. In spring and summer, frog eggs, tadpoles, etc. need to be removed frequently in the pond. 10~15 kilograms. Put a small amount of aquatic plants on top, and fasten the box lid with wire before transportation. Expenditure 39,716 yuan, including: shrimp seeds 15,000 yuan, feed 4,700 yuan, fertilizers 2016 yuan, water and electricity bills 2.The shrimp seedling breeding area is 280 square meters, the seed shrimp 1539 group, the breeding shrimp seedling size is 18.2 yuan, including: shrimp species 2.2 yuan, feed 0.5 yuan, water and electricity bills 8 yuan, pool rent 2.4 yuan, labor 3.The output of cement pond breeding is 6473kg, the price is 70 yuan per kilogram, and the output value is 123 yuan, feed 32 yuan, rent 32 yuan, fertilizers and fertilizers are 0.4 yuan, and water and electricity bills4.Pond breeding output5449kg, yield per mu227kg, price18.1 yuan, including: shrimp seedlings 10.6 yuan, feed 4.1 yuan, fertilizers 0.4 yuan, water and electricity bills1.Adjust the size of the parent species. Due to the late introduction and small size of the parent species, the parent species needs to be adjusted to 10～907 kilograms (1.36 kilograms/ square meters), and the profit per mu can reach 24145 yuan. Patent query