The crab polyculture technology

In recent years, the pond-cultivated river crabs have entered the period of meager profits. Binhai township fishermen in our district have boldly tried to raise crabs and catfish and have succeeded. On an average of 1/15 hectares, 100 kg of crabs are produced, 100 g per specification, 30 kg per carp, and 1 kg per tail. The average output value of 1/15 hectare is 2,500 yuan and the benefit is about 1,000 yuan. Every 1/15 hectare increases the benefit by 300-400 yuan. This efficient breeding mode makes full use of water space, forms a compound ecosystem where fishes and crabs coexist and benefit each other, reduces the incidence rate, and greatly improves the marketability of commercial crabs. The following technical points are summarized below.
1 After the pond clearing pond is exposed to the sun, every 1/15 hectares is disinfected with quick-lime 80kg clear pond to kill the enemy pests and pathogens. 7 days before the stocking of the crabs, the influent water is about 0.5m, and 60kg of Chicken manure is applied per 1/15ha. , cultivate planktonic food, make the water yellow green, transparency 30cm. And plant some grasses for the crabs to inhabit.
2 Seed stocking
2.1 In mid-May, 1,000 sticks of crabs will be stocked on each 1/15 hectare and the specifications will be 160-200 sticks/kg. The crabs require strong physique, complete limbs, no parasites, and no disease.
2.2 In late June, 30 pieces of desalted carp seedlings will be placed on each 1/15 hectare, and the specifications are 2.5-3cm. They require that the carp seedlings have the same specifications, quick action, normal body color, and no parasite or other diseases.
2.3 Stocking Precautions Carp life is more ferocious, Fish, crab polyculture should pay attention to control the timing of a good seedlings, and other crabs grow to about 60-80 / kg, the carp seedlings in the pond, to avoid the crab was injured. At the same time, large-sized crabs should be placed as far as possible.
3 Feeding management
3.1 Feeding Feeding Crabs Feeding Crabs Feeding on the principle of “mixing meat and vegetarian dishes with green spermatozoa”, the carp seedlings will be fed in the ponds before the fish ponds, and will be fed mainly with animal baits. As soon as possible, the crabs will grow to 60-80 kg/kg. In the whole breeding process, the total ratio of crabs with feeds accounts for about 30% of the fed amount. According to the growth of crabs, feeding and weather, etc., the amount of feeding should be controlled. Routines are added to the diet to prevent the occurrence of clam shell disease. Carp feeds full-price fish pellets and sticks to the four principles.
3.2 Water quality regulation The fresh water quality environment of crabs is controlled at 35cm. In the hot season, water is added 10cm a day until the highest water level, and EM biological preparations are sprayed 1-2 times to improve the water environment.
3.3 Disease prevention and treatment Laminate lime and calcium dihydrogen phosphate in appropriate amounts every month to improve water quality. Use 10kg per 1/15 hectare. Squid is a carnivorous fish, fish, crab nesting can eat extra small trash fish shrimp. Keeping the water fresh and greatly reducing the incidence of disease.
3.4 The patrol pond observes the color, escape prevention, feeding and clam shells every day. So that you can take countermeasures at any time.

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