Extensively cultivated Serrata blue crabs are intensively bred for a period of time to cultivate red crabs. The quality of crabs can be greatly improved. In October, female crabs that had been fertilized and fertilized were bred in an intensive culture pool to make their ovaries fully mature. Both sides of the shells were filled with red paste. The breastplates swelled and the dots above the abdomen became red. The entire carapace was brown or red. Brown, that is, bred red crab. Generally harvested before and after New Year's Day.
Crab pool construction pool area of ​​about 0.5 acres, the pool wall with a slate or brick 1 meter high, surrounded by the set up along the escape, with a coarse sand or gravel bottom. The bottom of the pool is best to be paved with slate, the slate is close to each other without seams, and sand is 10 cm thick on the slate.
Stocking Density A total of 2000 cultivars per acre of intensive breeding ponds and mated crabs weighing 250 grams or more are stocked. According to the development of crab ovary graded feeding.
The feed is fed to fresh fish, shrimp, shellfish and other animal feeds, and the daily feeding amount is 5% to 7% of the total weight of the crab. Fixed feeding, less vote in the morning and more in the evening. Stop feeding when the water temperature drops below 10°C.
Adjust the water depth to only maintain 30 to 60 cm, increase the amount of water exchange, and maintain adequate dissolved oxygen. Change water twice a day and install a water pump. Fresh sea water is pumped in at low tide and at 4 to 5 o'clock every morning. During the waterflood, it was found that the crabs competed for fresh water, and bamboo rafts were used in time to separate them.
Disease control Clam shells are common diseases in mating fertilized female crabs. Control methods: improve the water environment, refresh the water quality, and maintain a certain degree of salinity; increase the oxygen with an aerator or use a water pump to produce circulating water to increase oxygen; do not feed deteriorating, moldy feeds; and regularly use antibiotic drugs at 0.5 to 1 ppm Concentration of Quanchiposa; find diseased crabs caught in time, while using 2 ~ 3ppm bleaching water disinfection, to prevent the spread of disease.
Timely fishing was performed every 5 to 10 days to check the development of the ovary of green crabs. It was found that the red crabs were selected in time and put on the market for sale.
Crab pool construction pool area of ​​about 0.5 acres, the pool wall with a slate or brick 1 meter high, surrounded by the set up along the escape, with a coarse sand or gravel bottom. The bottom of the pool is best to be paved with slate, the slate is close to each other without seams, and sand is 10 cm thick on the slate.
Stocking Density A total of 2000 cultivars per acre of intensive breeding ponds and mated crabs weighing 250 grams or more are stocked. According to the development of crab ovary graded feeding.
The feed is fed to fresh fish, shrimp, shellfish and other animal feeds, and the daily feeding amount is 5% to 7% of the total weight of the crab. Fixed feeding, less vote in the morning and more in the evening. Stop feeding when the water temperature drops below 10°C.
Adjust the water depth to only maintain 30 to 60 cm, increase the amount of water exchange, and maintain adequate dissolved oxygen. Change water twice a day and install a water pump. Fresh sea water is pumped in at low tide and at 4 to 5 o'clock every morning. During the waterflood, it was found that the crabs competed for fresh water, and bamboo rafts were used in time to separate them.
Disease control Clam shells are common diseases in mating fertilized female crabs. Control methods: improve the water environment, refresh the water quality, and maintain a certain degree of salinity; increase the oxygen with an aerator or use a water pump to produce circulating water to increase oxygen; do not feed deteriorating, moldy feeds; and regularly use antibiotic drugs at 0.5 to 1 ppm Concentration of Quanchiposa; find diseased crabs caught in time, while using 2 ~ 3ppm bleaching water disinfection, to prevent the spread of disease.
Timely fishing was performed every 5 to 10 days to check the development of the ovary of green crabs. It was found that the red crabs were selected in time and put on the market for sale.
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