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I. Selection and stocking of crabs in the end of February or early March, choose the authentic Yangtze River water system, health and disease-free deduction crabs, no more than 200 specifications per kilogram. If crabs are brought back from the beach, they should be stored in closed cages for more than 48 hours, made of screens and sealed boxes, with a long zipper as the top seal, four corners fixed with bamboo poles, bottom The bottom of the pool is more than 30 centimeters, and the reserve density per square meter is no more than 5 kilograms. Because the water in the beach cultivation pond has a certain degree of salinity, the deducted crabs directly placed in the freshwater pool will crawl around due to incompatibility and cause escape, thereby reducing the catch rate. Inland rivers and locally grown crabs can be placed directly into fish ponds. The amount of stocking is about 100 per acre. For example, snails, shrimps, etc., can increase the amount of stocking properly. Otherwise, the amount of stocking should be reduced.
Second, the feeding of food organisms before the Ching Ming Festival put live snails per mu 150 kg, and in May to put egg shrimp 1.5 kg per mu.
Third, appropriate feeding When the water temperature reaches 18 °C, should be appropriate feeding. At the edge of the pond around the beach, more bean cakes, miscellaneous fish or cooked wheat and corn were introduced. The amount of feeding should not be excessive, and it should be finished on the same day. In the middle and late September, the crabs have passed the last oyster shell. At this time, there are not many snails and shrimps in the fish ponds, and they should be supplemented with bait. Generally, they are fed with bean cakes, small junk fish, chopped pumpkin silk, and hawthorn silk.
Fourth, set the aquatic grass belt in the fish pond around 1 meters away from the shore, with Alu bamboo or bamboo poles, bamboo Zhu Zizi tied into a straw box, box into the water peanuts and duckweed, for crabs habitat, feeding.
V. Pay attention to the prevention of fisheries from entering the pond. Apply net clothing to the water intake to prevent crabs from “eating on the water†and escape. At the same time, after entering the water, you must take a picnic tour once in the evening to drive the river crabs ashore.
Six, timely arrest and hold In early October, most of the crabs gonadal maturity, began to carry out reproductive migration. At this point, the listing should be promptly captured. Can be caught in cage nets or traps or manually captured in shallow water. Some of the captured crabs are not full enough and need to be placed in cages for raising and fattening. A hard plastic mesh sheet is used for the netting and is fully closed and sewn to the cage frame. A small window is left on the top of the cage, and the window door can be opened and closed for watering, feeding and crabs. After the cages are in place, place them in the side of the fish pond, and expose the top of the water above 50 cm and the underwater about 1 meter, and put the appropriate amount of water peanuts. Generally do two boxes, separated male and female, holding capacity of 10 to 15 kg / square meter. The feed is mainly based on small fish or cooked soybeans. After half a month of feeding, the cage will be shifted. The bottom of the tank must be removed at the bottom of the tank in order to avoid breaking the claw tip and causing the crab to die. This can improve the quality of crabs, and at the same time it can be extended to the Spring Festival to increase prices and increase profits.
Fish pond nesting crab enhancement technology
In 2002, we began experimenting with fish pond nesting crabs. In 2003, 78 acres were raised and 6,900 dungeons were released. In 2004, it reached 1,363 mu. There were 110.9 thousand crabs for crabs, 9927 kg of crabs, and 7.2 kilograms of mu. The output value was 442,200 yuan and the average mu was 324.4 yuan. The specific method is as follows.
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