The technology for raising blue crabs in seawater aquaculture ponds can overcome all the above drawbacks. At the same time, it will be convenient to observe the growth of green crabs and the advantages of arresting them. The technical points for raising crabs in seawater aquaculture ponds are as follows: 1. Conditions for seawater aquaculture ponds: it is convenient to enter and drain water. The water quality of seawater is fresh and not polluted. The ph value is between 7.8-8.5. The sediment is suitable for sand and silt quality to prevent mud. 2. Aquaculture Ponds Qingtang Water: The pool water is drained and exposed, and 50-60 kg of quicklime clear pond is used per acre for 15 days prior to planting, to kill harmful fish and harmful microorganisms, and improve the aquiculture pond bottom. In the 4-5 days prior to planting, use 10ppm tea seed cake to further clear the pond, thoroughly remove trash fish, fish eggs, etc., and then use the 60 mesh inlet net to filter the water to 60 cm water level, fertilize properly, and cultivate the pool water. Then mariculture species such as prawn, white shrimp, squid, squid, mudskipper, and shrimp shall be stocked to fully utilize the mariculture tanks. 3. Cultivation of blue crabs: The green crabs purchased by the farmers must be placed in small ponds or cages for intermediate breeding. The feeds to be fed are mainly annual insects, copepods, and fishes. The amount of daily feeding begins. For the green crab seedlings with body weight of 100-200%, the daily feeding amount gradually decreased as a percentage of the weight of the green crab seed, but the daily feeding amount gradually increased. Therefore, feeding should be based on the principle of not leaving the bait overnight, feeding 1-2 times a day, after 15-30 days of cultivation, crab crab shells can grow to 4-5 centimeters before reaching the cage specifications. 4. Line hanging and lifting technology: The crude iron wire is used to parallel line the sea aquaculture ponds, and the two ends are fixed. Every 1.5-2 meters is framed one by one. The empty tank can be used to manage the blue crab. Take a cage with a diameter of 35-50 cm, and use a wall thickness for the cage and a plastic frame for the upper end. Trawl nets have a diameter of 15 cm and are made of thin wire to feed. After that, the nets will be stretched and fixed on the rack line. On average, two cage cages will be lifted per meter. The line will be at least 30 cm above the pool water level. According to the water conditions, 500-1000 can be kept per acre. Each cage is stocked with a crab species with a crust width of 4-5 cm. 5, aquaculture management: the ideal food for cage blue crabs for live shellfish, snail blue crab can be double chelation shellfish, snail crush and eat it, the remaining live bait is not deteriorating water quality. Feed once a day for 3-5 days, and vote for more. Use dead animal feed to master the amount of feed in order to prevent water quality deterioration. Water quality management mainly determines the intake and drainage according to the transparency of the pool water, especially during the high temperature period in summer, the water exchange volume should be increased to ensure that the pool water is fresh and sufficient to dissolve oxygen. 6, mating and fattening: green crab grow to more than 250 grams each, the season in the fall, the green crab has reached the mating period, the cage of blue crabs will be put to the breeding pond, let it mate to ensure food supply to increase crab yellow And plump, improve the crab taste to get a higher sales price. 7, harvest: 15-30 days after the maturation of fattening, according to the weather and market conditions, timely arrest and sale.
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