Caged crab technology

Sanwa crab is a large crab produced in China. It has a delicious meat and has a high economic value. After two years of trial and trials in Yanqing Farm, Jincheng Town, Laizhou City, Shandong Province, it has successfully summed up a set of scallop farming equipment for the “caged-in-a-race crab” technical experience and achieved remarkable economic benefits. Now the situation is described as follows: First, the seed source 1. Natural seedlings: In mid-July to mid-August, acquisition of 50 to 100 g of natural juvenile crabs in the sea area was carried out, and the number was calculated as 3,600 birds/mu. The earlier the acquisition time, the better, the early seedlings are small, the price is cheap, and the number of individuals per unit weight is large. Relatively few investments. 2. Artificial seedlings: The crab seedlings cultivated in nursery farms in June were cultivated in the cement pool and reached a depth of 3 to 4 cm before being cultivated in the sea area. Second, aquaculture Due to the mutual killing of the crabs, a cage of 1 juvenile crab is placed in each cage and raised in a scallop farming truss in the offshore area. The aquaculture sea area should be located in a relatively gentle offshore area or a scallop aquaculture center area, so as to reduce damage to the crab body caused by the loss of bait caused by the currents bringing the bait out of the culture cage and the swing of the cage in the current. Third, daily management Feeding: The bait is mainly composed of fresh low-value oysters (sea red, etc.), and the amount of feeding is determined according to the growth of the crab and the amount of residual bait, and is generally controlled at 7-10% of the body weight of the crab. In the meantime, feeding crickets can be relatively more. The number of feedings is determined according to the ingestion intensity. Generally, the weight is 50-100g, and it is fed twice every 3 days. When the body weight is 15Og-200g, it is fed once every 2 days. When the body weight is larger than 25Og, it is fed once a day. 2. Clearing the bait and removing dirt: Because the residual bait is generally caught by the crab crab and smashed with the tide, the bait can be removed, the dirt is removed, and the dead crab is removed at the same time in the feeding process, and it is not necessary to perform the task alone; when the cage is seriously dirty, , can be properly caged. 3. Pressure cages: The weight of the breeding cages is relatively light, and it is easy to cause death due to injuries due to wind and waves. Therefore, it is necessary to use a drop stone or a sandbag to release the cage on the bottom layer of the breeding cage to reduce the damage caused by wind and waves. In the month of November, when the temperature of the cultured sea area dropped to 10-15°C, the food intake of the crab decreased, and even stopped feeding. At this time, it should be timely harvested or sold for overwintering. The survival rate could generally reach 80%-90%. IV. Artificial Seed Breeding In June, 50000 -60,000 crab seedlings with a specification of 20,000/kg were purchased from the nursery plant. The polyethylene plastic bag was used to transport water with oxygen and the survival rate was over 90%. In a total of 300 cubic meters of water in a number of concrete pools, shading, oxygenation management; feeding Artemia mainly feed, with chopped seared red meat and other bait. V. Economic Benefit Analysis Income: The average weight of the crab during harvest in November was 225g per animal. According to the 80% survival rate, the crab produced 648kg per mu, the selling price was 60 yuan/g, and the mu income was up to 3888O yuan. 2. Mu fee: Seed fee: 3,600 per mu, each average 0.8 yuan -1 yuan, 288O ~ 3600 yuan; bait fee: an average of 5 kg of small fish per cage, 2,000 yuan; labor costs, utilities, etc. Other expenses: 5,000 yuan; a total of l0600 yuan 3. Profit: 2828O yuan/mu 6. Notices 1. Naturally harvested crabs have higher survival rate and faster growth than artificially cultivated crabs. When harvesting, natural crabs generally weigh 150-250 g, while artificial crabs only grow to about 100 g. 2. During the breeding and feeding process, care should be taken with care, especially when the crabs of the oyster shell are in the culture cage. Vertical cages should be maintained during operation to prevent collision between the crab and the breeding cage. The water should slowly diffuse into the water to prevent the cage from squeezing the crab and causing the crab to die. 3. As far as possible, the bait is mainly based on fresh and low-value moths: First, moths live in seawater for a long time, which ensures the freshness of the bait and does not pollute the water quality; second, the crabs are free to ingest and the residual bait is not easily carried out by the tide. Outside the cage, to reduce the loss of bait; Third, the feeding amount of alfalfa can be larger, feeding time interval longer, suitable for large-scale farming. Since the feeding of chicken heads, livestock and poultry organs, etc., can easily affect the future taste of crabs, it should be avoided as much as possible to feed them as bait.

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