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Cultivation of blue crabs in mariculture ponds
Crab meat is delicious and nutritious, and the market price is high. It has diversified sand habits, nocturnal habits, and no drilling habits. The traditional aquaculture technology in Cixi City is mainly polyculture of blue crabs and other seawater species. This method of pond rearing has great troubles, mainly in the following aspects: 1. The density of blue crabs is not high, and the space for aquaculture waters cannot be fully utilized. 2. Green crabs have the characteristics of killing each other and other marine aquaculture species, affecting the yield of blue crabs and other cultured species. 3, feeding the amount is often not good, excessive feeding amount will cause accumulation of residual bait, water quality of the breeding pond, too little feeding amount will exacerbate the blue crab fratricide, affecting the survival rate of blue crab breeding. The technology for raising blue crabs in seawater aquaculture ponds can overcome all the above drawbacks. At the same time, it will be convenient for observing the growth and arresting advantages of green crabs. The technical points for raising crabs in marine aquaculture ponds are as follows: I. Conditions for marine aquaculture ponds The water quality of the seawater is fresh and not polluted. The PH value is between 7.8-8.5. The bottom quality is suitable for sand and silt quality, and the mud quality is eliminated. Second, marine aquaculture pond Qingtang water: The pool water drained dry, 15 days before the release of seedlings per acre with 50-60 kg of lime clear pond, kill fish and harmful microorganisms, improve aquaculture pond substrate. 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. Third, the middle crab cultivation: the green crabs purchased by farmers must be placed in small ponds or cages for intermediate breeding. The feeds fed are mainly insects, copepods, and gills. The daily feeding amount starts. 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. Fourth, wire hanging and lifting techniques: the use of crude wire in the sea aquaculture ponds parallel line, fixed at both ends, every 1.5-2 meters frame, empty can be used to manage the crabs. 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. Fifth, aquaculture management: the ideal food for cage crabs is live shellfish, snail blue crab can be double chelation shellfish, snail crush and eat, and 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. Six, mating and fattening: Green crab grows to more than 250 grams each, the season in the fall, the green crab has reached the mating period, the caged crab will be put to the breeding pond, let it mating, ensure the feed supply, to increase crab yellow And plump, improve the crab taste to get a higher sales price. 7. Harvest: After 15-30 days of mating and fattening, timely arrest and sale will be conducted according to the weather and market conditions.