What should be paid attention to in raising crayfish in summer?

First, make preparations before stocking: the pond should have good intake and drainage facilities. Bamboo slices and gauze should be used around the pond to surround the 50-centimeter-high anti-escape wall.

Set up shrimp habitats in aquaculture waters, such as rubble, bricks, stones, nets, old tires, grass dragons, etc. as shrimp nests for shrimp concealment and defense against enemies.

Water hyacinth, water peanut, water floating lotus, Zizania caduciflora and other aquatic plants are planted around the pond, the coverage of which is generally 1 to 3 of the surface of the pond, to facilitate lobster shade and breed lobster's favorite plankton.

Generally, newly-built lobster ponds can be cleaned with quicklime water, with 100 kilograms per mu. If lobsters are raised in old ponds or lakes, silt should be cleared, trimmed and exposed. 10-15 days before stocking shrimp seedlings, 50 kilograms of quicklime per mu should be used for dry pond disinfection. At the same time, completely eliminate the predatory wild enemies such as catfish, Loach, black fish, snakes and rats in the pond.

Shrimp fry 10-15 days before stocking, usually lame pig manure per mu of water? 200 kg, cultivate plankton and provide appropriate amount of organic detritus as shrimp feed.

Before the pond enters the water, it is best to install a water barrier net of 60 to 80 mesh to prevent the enemy from entering the water. The depth of the pool water is kept at 50-80 cm, and the transparency is between 30-40 cm.

Second, stocking shrimp fry: shrimp fry should be stocked in the morning and evening on a sunny day to breed 6000cm 8000 young shrimps per mu or 4000cm 6000 young shrimps 3cm long. The specifications of shrimp fry released in the same pond are neat and consistent. At the same time, it can raise about 50 grams of flowers, 300 million 400 silver carp and 200 mackerel in pond water.

The third is careful bait: minced fish and minced meat are used within 3 days after seeding, and small mixed fish, minced meat or formula feed are put in 1 month after 3 days. When the shrimp fry grows to 6-7 cm, all can be fed with crushed snail, clam and appropriate amount of plant feed such as wheat, wheat bran, corn, cake or formula feed. The daily feeding amount is to be full, finished, and no residual bait is left. Generally, crayfish and crayfish are fed at 15% to 20% of body weight and adult shrimp at 5% to 10% of body weight, which can be adjusted according to the eating condition of shrimp. Feed twice a day, once in the morning and once in the evening. The evening feeding accounts for 70%-80% of the daily feed. The bait should be placed around the pond and dispersed appropriately, and more lobsters should be thrown in places where lobsters are concentrated to facilitate their feeding.

Fourth, water quality management: the lobster grows fast, the metabolism is exuberant, and the oxygen consumption is large, so the water quality of the shrimp pond should be kept fresh, adding water 15-20 cm deep every week, to ensure that the water quality is fresh, clean, and have enough dissolved oxygen, and the transparency of the pool water is controlled above 35 cm deep. When the day is overheated, the pool water should be properly deepened to stabilize the water temperature. Strictly prevent water quality from industrial pollution, pesticide pollution and chemical pollution.

When the dissolved oxygen in the water is low, the water quality is aging, or in case of thunderstorm, muggy days, continuous cloudy days and other bad weather, the amount of bait should be reduced or stopped, and pay attention to observation. If it is found that the lobster responds slowly, swims to the shore, floats and climbs to the shore, it shows that the hypoxia is serious and it is necessary to inject water or turn on the aerator to increase oxygen in time.

Fifth, disease prevention: check frequently, patrol ponds frequently, and pay attention to lobster foraging, activity, growth and molting, so as to take necessary technical measures in time. Remove the moss in the pond in time; often check the filter screen at the inlet and outlet to prevent the escape of lobster or the entry of wild fish and other pests due to broken filter. Always pay attention to whether there are enemy creatures in the pond, such as water rats, water snakes, water birds, frogs and fish, etc., and get rid of them in time if so.

Shrimp seedlings should carry out body surface disinfection before going into the pond to prevent pathogens from being brought into the pond, regularly disinfect shrimp ponds with quicklime, often add new water to keep the pond water clean, and add a variety of vitamins to shrimp feed to enhance shrimp immunity.

Sixth, timely fishing: generally raised for about 2 months, when the lobster weight is more than 50 grams, can be caught on the market, fishing lobsters using shrimp cages, ground cages, purse seine and other methods to catch large and stay small.