(1) With large and small ponds, the ratio of large ponds to small ponds is 3:1.
(2) The small ponds were planted with Elodea after the disinfection in the dry pool at the end of October, and the planting area was 60-70% of the pond area.
(3) The water level of the small pond is controlled at about 30 cm. After the aquatic plants grow up, the crabs are released and gradually deepen the water level.
(4) After the crabs enter the small pond, when the water temperature reaches 8°C, they feed the high-protein crab full-grain pellets to enhance the crab's constitution, and the feed rate is about 1%; until around March, the water temperature exceeds 10°C, and every day Feeding of high-protein crab whole-grain pellets began, and the feed rate was about 2%.
(5) After the disinfection of the dry ponds in large ponds, black algae are planted around the middle of March. The method of planting buds with black vines was adopted. The row spacing was 0.5 meters and 0.5 meters, and 3 to 5 buds per hole were inserted into the mud. The sprouting amount was about 1.5 kg/mu. When the water temperature rises above 15°C, it begins planting Vallisneria. Vallisneria sophora is sown in shallow water areas where the water level in the pond does not exceed 20 cm. The seed amount per mu (calculated on the actual planting area) is about 150 g.
(6) Large ponds have lived 100 kg/mu of snails in the end of March and early April, and live bolts have been used for 300 kg/mu in mid-August.
(7) Before and after May 10, use cages to catch crabs from small ponds. Select crabs of a size greater than 20 grams per catfish and put them into large ponds. The density of crabs in large ponds ranges from 800 to 1,200 per mu.
(8) Large ponds raise small amounts of earthworms, cockroaches and earthworms and are not allowed to stock other fish.
(9) Large pond water level control: In the middle and early April, the water level is controlled at 30 to 50 centimeters. In May, the water level is controlled at 60 to 80 centimeters. In June, the water level is maintained at 100 to 120 centimeters. In July and August, it is maintained at 130. Water level of ~150 cm, and water level of 100 to 120 cm in September and October.
(10) The crab pond water plants require the top to be 10 to 15 cm below the water surface. Once the plants are exposed to the surface of the water, the plants will be cut in time and the plant height will be maintained at 30 to 40 cm.
(11) According to the growth characteristics and nutrient requirements of crabs, whole crab feed with different crude protein content is fed before and after each shell.
(12) Regular use of probiotics and environmental modifiers to improve water quality and sediment quality.
(13) supporting microporous oxygenation equipment to increase the dissolved oxygen in the pool water.
(14) Adhering to the principle of “disease-free prevention, early disease prevention, and prevention-based treatmentâ€, comprehensive preventive measures are taken to reduce or prevent the occurrence of crab disease.
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