The new technique of intensive breeding of male and female crabs in river crab

In recent years, the author has made an exploration of river crab rearing at Chenzhuang Village, Yifeng Town, Yandu District, Yancheng City, Jiangsu Province. The crab size is 100-175 grams, and the male crab size is 150-250 grams. The average yield per acre is 82.75 kg. 98% of the ideal results, compared with undivided ponds, specifications, production have improved significantly.

1. Pond conditions. A total of 8 test pools, a total of 6,670 square meters each, 5.3 hectares. The pond can store 1.5 meters of water, the slope ratio of the pond is 1:2.5, and the water source is sufficient. There are injection and drainage ditches around the pond, and aquatic plants are planted to purify the water. In the crab pond, plants such as Elodea and Vallisneria are planted to cover 70% of the water surface. Aquatic grass feeds both crabs and crabs. The escape prevention facilities are made of green gauze nets and plastic films, which are both simple and solid and save labor and cost. After the Spring Festival, dry pools, deforestation, and clear ponds are disinfected and 100 kg of lime are used per acre.

2, seed stocking. The use of dwarf crab species has a high survival rate, rapid growth, and large crab size. Restocking time is March. The male and female deer crabs were stocked in 4 pools and placed in 500 ponds per acre. Five catfishes were stocked and 10 catfishes were reared. The specifications were 167 grams per tail and the rearing ponds were stocked with 100 kg of live snails per acre before Chingming.

3, feeding and management. The aquatic plants in the pool can meet the feeding needs of crabs in the early stage, and pumpkins and small trash fish need to be fed in the middle and later stages. The main feed for crab special feed. During the whole period of feeding, 100 kg of special pellet feed for crabs and 150 kg of small fish were added for each mu.

Focus on the principle of prevention of diseases mainly based on ecology, no obvious epidemics of crabs have been seen in recent years. The main measure is to have a water source purification ecosystem around the culture pond; regularly sprinkle lime water in the water source area and the culture pond; change the water once a month in the spring of the pool, and change the water once a week in summer and autumn to keep the water quality good.

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