Experience of mixed culture of river crab and sea bass in summer

This mixed culture model of river crab and perch makes full use of water space, forms a compound ecosystem of coexistence and mutual benefit of fish and crabs, reduces the incidence, greatly improves the listing quality of commercial crabs, and increases the income of breeding. The main technical points are summarized as follows:

Pond cleaning

After the pond was exposed to the sun, the pond was disinfected with 80 kilograms of quicklime per mu to kill enemy organisms and pathogens. 7 days before the release of crab seedlings, put in 0.5 meters of water, 60 kilograms of chicken dung per mu, cultivate plankton bait, make the water color yellowish green, transparency is 30 centimeters deep, and plant some aquatic plants for river crabs to inhabit.

Seedling stocking

Crab seedlings in mid-May, 1000 buckle crabs per mu, 160 million per kilogram, crab seedlings require physical fitness, complete limbs, no parasites, no disease.

In late June, 30 desalinated sea bass seedlings were released per mu, with a body length of 2.5 cm to 3 cm, requiring neat specifications, agility, normal body color and no parasites and other diseases.

Note: perch is ferocious in nature, mixed culture of fish and crab should pay attention to control the time difference of releasing larvae, and only when the crab fry grows to 60-80 per kilogram, can the perch fry be put 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.

Feed feeding

The feeding of river crabs adheres to the principle of "the combination of meat and meat and the combination of green and essence". Before the sea bass fry go down to the pond, the buckle crabs are mainly fed with animal bait, so that the buckle crabs can grow to the standard of 60 million per kilogram 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 principle of "four determinations".

Water quality control

The river crab likes the fresh water quality environment, the transparency is controlled at 35 cm deep, enters the high temperature season, adds water 10 cm deep every day, until the highest water level, and sprinkles the whole pond with EM biological agents for 1 to 2 times to improve the water environment.

Disease prevention and cure

Sprinkle an appropriate amount of quicklime and calcium dihydrogen phosphate every month to improve water quality, with a dosage of 10 kg per mu. Perch is a carnivorous fish, mixed culture of fish and crab can eat excess small miscellaneous fish and shrimp, keep the water quality fresh, and greatly reduce the occurrence of diseases.

Pond patrol management

Observe the water color, escape, eating, molting and disease every day, so as to take measures at any time.