The experience of mixed culture of river crab and sea bass in pond

1 pond cleaning

After exposure to the sun, the pond was disinfected with quicklime 80kg every 15 ha to kill enemy organisms and pathogens. 7 days before stocking, the crab seedlings were fed with 0.5 m of water, and chicken manure 60kg was applied every 15 ha to cultivate plankton bait to make the water yellowish green and transparent 30cm. And plant some aquatic plants for river crabs to inhabit.

2 Seedling stocking

In the middle of May, 1000 buckle crabs with specifications of 160,200 were released per 15 ha. Crab seedlings are required to be physically strong, complete in limbs, free of parasites and disease.

2.2 in late June, 30 desalinated sea bass fry of 2.5-3cm were put in every 15 ha, which required neat specifications, agility, normal body color and no parasites and other diseases.

2.3 precautions for stocking perch is ferocious in nature, so the time difference between fish and crab mixed culture should be controlled. When the crab fry grows to about 60-80, put the perch fry into the pond to avoid damage to the crab. At the same time, large size crab seedlings should be put in as far as possible.

3. Feeding and management

3.1 Feed feeding river crabs adhere to the principle of "combination of vegetarian elements and combination of green essence". Before sea bass fry go down to the pond, buckle crabs are mainly fed with animal bait, so that the number of buckle crabs can grow to 60-80 as soon as possible. In the whole process of breeding, the proportion of full-price compound feed of river crab accounts for about 30% of the total amount of feed. The feeding amount should be flexibly controlled according to the growth, feeding and weather of river crabs. Molting element is added to the diet regularly to prevent molting failure. The perch is fed with full-price fish pellet bait and adheres to the four principles.

3.2 Water quality control river crabs like fresh water quality environment, transparency is controlled in 35cm, enter the high temperature season, add water 10cm every day until the highest water level, and sprinkle the whole pool with EM biological agents 1-2 times to improve the water environment.

3.3 Disease prevention and control sprinkle appropriate amount of quicklime and calcium dihydrogen phosphate every month to improve water quality. 10kg is used for every 15 ha. Perch is a carnivorous fish, fish, crab culture can eat excess small miscellaneous fish and shrimp. Keep the water quality fresh and greatly reduce the occurrence of diseases.

3.4 observe the color of the water, prevention of escape, eating and molting every day. In order to take measures at any time.