The polyculture of crab and shrimp is very important

The crab sets up the green prawn, and the pond “cultivates the water” should first plant the grass. Generally, at the end of January, the yellow silk grass is planted on the gorge of the pond. In early March, Elodea is planted along the pond embankment, and at the beginning of April, it is placed on the surface of the pond. Plant seedlings of Vallisneria species, and then plant them with black algae. In the high-temperature season in summer, there are no plants growing in ponds, and some floating plants (water peanuts, water hyacinth, etc.) are surrounded to ensure that the planting area of ​​aquatic plants is 1/3 to 1 of the pond area. /2. In the pond, put snails in suitable quantities. Put them on for the first time before and after Ching Ming. Put 200 kg of fresh snails per acre, and put them in the beginning of July for the second time. Put 200 kg of snails per acre, avoid them at noon and spread evenly ( Do not pile one place).

One week after pond clearing, it is necessary to detoxify and regenerate water. Use "Clear Water Safety" half a bag to detoxify the water body per acre. The fermented human and animal manure and fertilizer water can be used for fertilizer and water, which can provide palatable shrimp and crabs with a suitable active bait. At the end of February, the species of river crabs will be put into use, and 120 to 140/kg river crabs will be planted per acre. In early March, 1200 to 1500 fish/kg of green shrimps will be planted at 3 kg per mu. G/tail of 10 squid. The seedlings were sterilized with 4% saline before bathing for 6 minutes to kill germs on seedlings. It is worth noting that the crabs were first raised in ponds in the deep waters of the ponds in March and April. After the first harvest of green shrimps in May, the seine nets were removed and allowed to move freely in the ponds.

The dissolved oxygen in the pond water is the key to breeding crabs and shrimps. It is better to lay a microporous oxygen aeration pipe. It is switched on in hot weather in the evening to 8:00 in the morning. Normal weather is switched on in the middle of the night to 7:00 in the next morning. It is turned on for 2 hours every 2 hours. Ensure that the dissolved oxygen in the pond water is maintained above 5 mg/l. A biological agent such as a water conditioner and a sediment improver is applied once every half month, and a water body disinfectant (mainly bromine and iodine) is applied once. Each month, Chinese medicinal herbs, immune polysaccharides, multivitamins and other baits are fed once to prevent the onset of disease.

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