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First, the aquaculture facilities pond area is suitable for 3 ~ 5 acres, depth 1 ~ 1.5 meters, slope ratio 1:2.5. The bottom of the pool is flat, and the bottom quality is in loam, and the slope is hard and the pond has good water retention. Adequate water supply, no water pollution. Drainage can be built and drained. Freshwater lobsters are less able to escape than crabs, but escape prevention facilities are essential. Usually use plastic film, wire mesh or calcium plastic plate, along the pool around the use of bamboo piles or stakes to protect the escape.
Second, prepare before restocking
1. Thoroughly clear the pond, disinfect the shrimp seedlings 20 to 30 days before stocking, drain the pool water, keep the mud about 5 centimeters thick, and renovate the ponds, using 75 kg of lime per acre. Thoroughly clear the pond for disinfection.
2. Apply enough basal fertilizer to compost 500-600 kg of livestock manure per acre to cultivate rotifers, cladocera, and copepod plankton, and provide appropriate feed for shrimp seedlings and shrimp species.
3. Plant aquatic plants in the pond Planted leaves of Hydrilla, Malaria, Elodea and other aquatic plants account for 1/3 to 2/3 of shrimp pond area. At the same time, a bamboo tube and a plastic tube are installed at the bottom of the pool to provide habitats, clam shells, and shelters for freshwater lobsters.
Third, the breeding of freshwater lobster
1. Broiler selection can choose broodstock from September to October in the previous year or from March to April of the same year. It requires individuals to weigh 30 to 50 grams, complete appendages, health and disease-free, strong activity, male to female ratio is 2:1 3:1.
2. Breeding freshwater lobsters can lay eggs 3 to 4 times a year, and the egg color is yellow. The amount of eggs held varies with the size of the broodstock and is generally between 500 and 2,000 grains. Each mus of 40 to 60 kilograms of broodstock can be used, and 3% salt water is used for bathing for 10 minutes before stocking to kill pathogens. In order to make full use of the water body and regulate water quality, 50 to 100 tails per mu can be mixed. During the cultivation period, fresh water grass, bean cake, wheat bran or compound feed can be fed, and a part of animal feed, such as chopped snail meat, livestock and poultry slaughtered leftovers, etc., can be added. Each year from April to May is the reproduction time of the freshwater lobster. The fertilized eggs hatch into the juvenile shrimp in the female's belly, and the incubation time takes 40 to 70 days. After juvenile hatching, the growth and development of juveniles are completed under maternal protection. Once the young shrimps leave the mother, they can take food and live independently. When a large number of juvenile shrimps are found in the breeding ponds, the seedlings should be harvested in time to cultivate the shrimps. At this time, the average length of the young shrimps is 0.8 cm. After 15 days of cultivation, the bodies are as long as 2.4 to 3 cm. Shrimp farming can be produced.
Author: Agri-forestry Bureau of Hanjiang District, Yangzhou City, Jiangsu Province
Freshwater lobster breeding technology points (on)
The freshwater lobster is known as crayfish, which has strong adaptability and can be widely used in freshwater lakes, rivers, ponds, gutters, rice fields and other water bodies. It is mainly distributed in the middle and lower reaches of the Yangtze River in Jiangsu, Zhejiang, and Shanghai. Up to 1200 to 2,000 yuan. In addition, astaxanthin, chitin and its derivatives extracted from the crustacean of lobster can be widely used in food, medicine, feed, agriculture and environmental protection, and its shrimp, shrimp yellow and whole shrimp export also rapidly increase. In general, the cultured lobsters have the advantages of low cost, wide marketability, and high yields. The lobsters are produced through the young shrimp (shrimp)-kid-shrimp-shrimp (broodstock) stages.