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 baits, water quality deterioration of the breeding pool, 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 catching advantages of green crabs. The technical points for raising crabs in marine aquaculture ponds are as follows: 1. Aquaculture Pond Conditions: Requirements for Inlet and Drainage 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, the seawater aquaculture pool Qingneng 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 the 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 cultivation of green 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 insects, copepods, and gills, and the daily feeding amount 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.
Fourth, wire hanging cultivation 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.
V. Breeding management: The ideal food for cage blue crabs is live shellfish and snails. The crabs can be crushed with shellfish and snails by double chelation, and the remaining live bait is not deteriorating. 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.
Sixth, 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 mate, ensure food supply, to increase crab yellow And plump, improve the crab taste to get a higher sales price.
VII. Harvesting: After 15-30 days of mating and fattening, according to the climate and market conditions, timely arrest and sale.
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 baits, water quality deterioration of the breeding pool, 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 catching advantages of green crabs. The technical points for raising crabs in marine aquaculture ponds are as follows: 1. Aquaculture Pond Conditions: Requirements for Inlet and Drainage 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, the seawater aquaculture pool Qingneng 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 the 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 cultivation of green 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 insects, copepods, and gills, and the daily feeding amount 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.
Fourth, wire hanging cultivation 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.
V. Breeding management: The ideal food for cage blue crabs is live shellfish and snails. The crabs can be crushed with shellfish and snails by double chelation, and the remaining live bait is not deteriorating. 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.
Sixth, 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 mate, ensure food supply, to increase crab yellow And plump, improve the crab taste to get a higher sales price.
VII. Harvesting: After 15-30 days of mating and fattening, according to the climate and market conditions, timely arrest and sale.
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