Product crab efficient holding

Around October is a season of crab fishing. For crabs that have been harvested, they are not ready to be transported or sold overnight, or are left to be sold when the market is in short supply, or are waiting to be exported for export. In particular, there are a large number of commodities in the grass-dragging lake network and in the ponds and concentrated areas of crabs. The fishing period is concentrated, coupled with the high temperature in the early stage of the fishing. Some of the newly hatched shells are short-lived, which is not conducive to the transportation of crabs. It also requires special pools to be raised. Indoor holdings. Select ventilation, good insulation performance, clean rooms or warehouses with four walls. After cleaning, place the selected commercial crabs and spray them with fresh water once or twice a day to keep the interiors and crabs moist. According to the number and duration of holdings, feed a small amount of small fish and shrimp. At the same time, strengthen management to prevent escape. This method is suitable for high-volume short-term storage of commercial crabs, generally 3 to 5 days, survival rate of up to 90%. Crab cages are raised. Bamboo crabs are used to make crab cages of a certain size. They are drum-shaped. Wicker cages of a certain size and shape can also be made of wicker. The bottom of the crab cage is usually 40 cm in diameter, 40 cm in height, and 20 cm in diameter. There are also large crab cages or large crab loaches with a diameter of 100 cm or more at the bottom. Bamboo or iron strips can also be used to make rectangular crab pots or crab pots. According to the size and number of crab cages, they are stocked with carefully selected commercial crabs. The amount of stocking depends on the feeding and management level of the crab cage and the holding time, and the male and female can also be separately caged. For temporary raising, choose ponds or rivers with better water quality, deeper water levels, lay down wooden poles, place crossbars, and make springboards. Hang the crab cage (å•†å“) with merchandise crabs under the crossbar. The cage enters the water from 1 to 1.2 meters and the bottom of the cage is not muddy. After the crab cage is hung into the water, a certain amount of animal feed and green leaves are regularly fed into the cage, and at the same time, management is strengthened to increase the fat and weight of the crab. This method is convenient and flexible, and can be used for a long or short period of time. It is easy to raise and manage, and it is not easy to escape crabs. The survival rate is high, and it is generally above 95%. Earthen pond raising. In the concentrated production areas of river crabs, the ponds with better conditions are selected. The general area is 4 to 10 mu, the water depth is 1.5 to 2 meters, the bottom of the pool is a hard bottom, and a commercial crab pool is built, and anti-escape facilities are built. 15 to 20 days in advance clearing pond disinfection, after the disappearance of toxicity, can be raised on the merchandise crab. Feed baits and strengthen management. When they are to be sold, they are drained and pooled to catch the market. The cement pool is raised. At the edge of the crab pool or the lake, choose a suitable location, artificially build a concrete pool, which is generally 200 to 400 square meters. The walls are made of bricks, the cement is smoothed, the bottom of the pool is cement, or it can be hard mud. Depth 1 to 1.5 meters, and built into the drainage system and anti-escape facilities. Twenty days prior to raising, the whole pool is splashed with quicklime or bleached powder and disinfected in the clear pond. After the toxicity disappears, the commercial crab can be raised temporarily. The cement holding tanks should normally be built before the end of September when the commodity crabs are caught. Usually, the selected commodity crabs can be placed between 0.6 and 0.75 kg per square meter. If the holding time is short, the stocking density can be increased appropriately; Longer, it can be reduced accordingly. During the holding period, we must regularly and quantitatively feed animal baits such as small trash fish, and appropriate amounts of green feed. Feeding requirements for bait should be quality and quantity sufficient, fresh palatability, and even and reasonable, so that commodity crabs gain weight and increase fertilizer, and meet the requirements for listing and export. If you hold for a period of 1-2 days in a short period of time, you do not need to invest in bait. Just manage it carefully. Due to the high density of raised commodity crabs, the increased feeding of animal foods, and the high temperature, the water quality tends to be deteriorated. Therefore, regardless of the method used for temporary conservation, water quality management should be seriously performed. Normally the water depth is kept at about 1 meter. When the water temperature is above 10Â°C, pay attention to changing the water 2 to 3 days. When changing water, fresh river water should be used, and micro-flowing water can be used conditionally to promote crab growth, fattening, and keeping larvae. If you hold for a long time, you should deepen the pool water to more than 1.5 meters in winter. In the event of ice on the surface of the pool, ice should be increased in time to prevent oxygen from suffocating due to lack of oxygen in the pool surface.
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Posted on June 18, 2019