The pond area is 5~10 mu, the water depth is 1.5~2 meters, the slope ratio of the pond is 1:2 to 1:3; the bottom of the pond is slightly inclined to the drainage outlet, and the sludge is kept 20~30 centimeters deep; Convenient, convenient transportation, electricity, abundant water, fresh water.

Prepare before breeding

Qingtang: Use the winter free time to drain the pool water, freeze and sun-tank for 30 days, then use 100-150 kg of quick lime per acre to clear the pond.

Planting aquatic plants: Before planting, the bottom of the pond, slopes, etc., are cultivated to account for 30% of the estuary area, such as Vallisneria, Hymenocallis, and water peanuts. During the cultivation process, aquatic weeds are easily eaten and decayed by crabs, so they should be added in a timely manner. The transplanted plants must be washed and then disinfected with quicklime or bleach solution to ensure a good habitat and growth environment for the farmed animals.

Water injection and fertilization: watering 50 centimeters deep before stocking, depending on the pond's fatness, the amount of mu applied by fermented organic fertilizer is 100~200 kg, and the fertilizer water and palatability bait when deducting crab ponds are cultivated.

Seed stocking

From February to March, 500 stocks of 180 to 200 crabs per kilogram were stocked, and each liter of water was prepared with potassium permanganate or zinc sulphate 10 mg for 15 minutes before stocking. The stingray fingerlings have to be cultivated locally, with neat specifications and robust physique. The stocking size per acre in March is 150 fish fry per 100 kg.

Daily management

Feeding: The feed is mainly based on whole crab formula feed, with fresh feed such as snail, chilled fish and aquatic grass. In the whole process, chitosan and galactomannan oligosaccharides were added, which were 0.03% and 0.2% of the fed amount respectively, and were preferably added at the time of production in the feed processing factory. During the stocking period, 200 mu of mussels are put into stocking and the water grass is kept in the conventional proportion. As a natural live bait, all live baits should be washed and disinfected. Feed 2 times a day, 9am, 5pm-6pm, and feed 2/3 of the daily feed in the afternoon; Daily dose is 3%~7% of crab weight, 9~10 months Mu crushed snails or small trash fish over 100 kilograms. After the end of November, do not feed, enter the fertilizer winter.

Water quality management: Maintain the water level 50 to 60 cm in the early stage, add water 1 to 7 to 10 days, add water 10 to 20 cm deep; add water 1 to 5 to 7 days after May, the water level to maintain 80 to 100 cm; after the end of July 3 to 5 days, add water, change the water once, the water level to maintain 100 to 150 cm. If the air temperature is too high and the water quality is too fat or poor, large water changes or biological agents may be used to regulate the water quality. In the middle and late period, 20 to 30 days, use lime to disinfect once and use 5 kg per mu. From July to September, microbiological agents are often used to regulate water quality, such as EM bacteria, photosynthetic bacteria, and Bacillus, usually for 15 days. The transparency of the water body is 30-40 cm in the early stage and 40-60 cm in the middle stage.

Day-to-day management: Two morning and evening patrols are conducted twice, mainly to observe the water quality and the feeding, disease, and growth of the farmed animals. In particular, observe whether the crabs have dull movements and the phenomenon of the beach, and find that abnormalities are timely adjusted for management measures. Timely removal of residual grass bait to keep the water clean; excessive water should be sparse, too little to add, maintain a certain proportion of water to regulate the pond environment, ensure normal growth of crabs. During the growing season, at noon on the sunny day, oxygenation and water addition are frequently performed and water changes are performed for 1 to 3 hours. The dissolved oxygen per liter of water is maintained at 5 mg or more, and the ammonia and nitrite contents are controlled at 0.2 to 0.5 mg and 0.05 to 0.1 mg, respectively. .

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