?? 1, pond preparation ponds require sufficient water, good water quality, without any pollution, an area of ​​more than 10 acres, water depth of about 1.5 meters. The fence is surrounded with materials such as asbestos tiles, cement boards, etc. The fence is buried 20 centimeters below the earth and 50 centimeters above the earth. The pool water was drained in winter and the excessive silt was excavated. The sun was frozen for about 1 month. Then the water was injected and disinfected with quicklime. The dosage was 75 kg per mu.
Second, planting aquatic plants Clearance pond clearing after about 10 days, the pool surface transplanting Izao, per acre with 40 kilograms of tender stems, every 10 meters cutting 1 line. In the first half of April, we planted 5-meter-wide bittergrass in a gap zone with 1 kg of grass per mu. The empty belt is planted with a bag of reeds or wormwood and other emerged plants every 30 square meters, and about 1.5 square meters of floating plants such as water peanuts and duckweed are transplanted and fixed with a bamboo basket to prevent drift.
Three, put snails in early April in each mu put fresh snails 300 kilograms, let it reproduce naturally, as the crab's natural food. During the breeding period, supplement according to the density of snails in the pool.
?? Fourth, all stocks of seedlings must be stocked before the end of April. Each acre is released: 400 to 400 crabs per kilogram; about 50 grams of large-sized carp species weighing 50 grams per carp; 50 to 70 fishes of carp and carp exceeding 10 cm in length. In addition, the 2-3 kilograms per year of species, 2-3 kilograms of shrimp in every other year, weigh about 2 kilograms per carcass weight of about 100 grams, so that they naturally reproduce shrimp and fish for carp feeding.
?? 5, bait feed the crabs bait is mainly wheat, bran, small trash fish, pig blood and livestock waste, later fed part of the feed pumpkin, sweet potatoes and so on. Take the method of “two fine intermediatesâ€, combination of meat and vegetables, reasonable collocation, and fixed-point feeding. Feed once a day in the afternoon and check on the next day. If there is any surplus, reduce the amount of feeding. The daily feed amount of the feed is generally arranged according to about 7% of the weight of the crab.
?? VI. Daily management First, always add new water, keep the transparency above 35cm, and change the water in the hot season. The second is to sprinkle lime once every 20 days, each time 10-15 kilograms per acre, can prevent fish and crab diseases, but also improve water quality, adjust the pH value, but also increase calcium, promote crab shell and growth. The third is to check whether the anti-escape facilities are damaged or not, and add net bags to the drains to prevent escape and enemy invasion.
In response to the recent decline in the price of crabs and the low efficiency of raising crabs, Jiangsu Yandu County Aquatic Farm raises squid in crab ponds, which has yielded 63. 5 kilograms of productive crabs and 13 kilograms of carp. Good results. The culture method is as follows: