Crab Set
The crabs are suitable for raising fish in some lake areas. Take Jindeng Village, Jieshou Town, Gaoyou City as an example. The village has a breeding pattern of crabs and oysters with a total of 670 mu. One fish will increase income by about 1 million yuan.
The net enclosure facilities are surrounded by 2 layers of polyethylene mesh fences around the lake. The mesh is about 2 centimeters. A dense net is sandwiched between them to prevent crabs from fleeing. The bottom of the net is made of pebbles for sinking. The bottom of the cage is buried in the bottom mud. Cm and step on it. Surrounded by bamboo piles and plastic film fences, the height is about 50 cm higher than the highest water level in the lake. Water-grass cultivation can be used to plant wild grasses and other aquatic plants in the absence of water and grass resources in the Lake District.
Put live snails 150-200 kilograms per mu before the release of live snails Ching Ming, to provide natural active feed for river crabs.
Seed stocks are stocked in 11-12 months or in the following year from February to mid-March, when the water temperature is 4-8°C. In general, 120-150 crabs of 140-200/kg, 14 fishes of 7 tails/kg, and 5 fishes of 4 tails/kg are released per acre. Before the crabs are stocked, they are soaked in lake water for about 3 minutes and then raised for a while. After repeating 3 times, soak for 30 minutes with 10-20 g/L potassium permanganate solution or 30-50 g/L salt water for 30 minutes. In the upwind, climb into the water.
Feed feeding According to the size of crab fingerlings, artificial feeding is carried out in the early stage of the cultivation to meet the growth needs of crabs. From the 15th day after the stocking of the crabs, they were fed 3 times a day, ie, 7-8 am, 13-14 pm, and 18-19 o'clock in the evening, the daily dose was 15% of the total weight of the crabs; April , feeding 2 times a day, respectively, at 8-9 am and 17-18 pm, 30% of the daily feeding amount in the morning, 70% in the afternoon, and the daily feeding amount is 10% of the total weight of the crab in the pool - 15%. In March-April, minced fish and snail meat were mainly fed (70%), supplemented with cooked corn, squash, or potatoes (30%), and feed points were set around the perimeter of the mesh. Shallow water plants are appropriate. From May to July, with the growth of crabs and squid, natural feeds, such as aquatic weeds, snails, maggots, etc., can be eaten on their own, and the amount of artificial feeding can be appropriately reduced. During August-September, feed once a day at 17-18 pm, and the daily feeding amount is 2%-3% of the total weight of the crabs. Potatoes, wheat, corn, etc., with high plant protein content are mainly used ( 80%), supplemented with a small amount of wild fish and snail meat.
Day-to-day management adheres to day and night patrols, observe the feeding situation of river crabs and squid, strengthen the management of the fence facilities, find problems to solve in time, and prevent crabs from escaping.
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