Buy crab big eyes larvae Notes
Understanding the process of breeding crabs Before purchasing large-eyed larvae, farmers should first understand the entire production process of crab farms, including: pro-crab, feed use, breeding cycle, and so on. The pro-crab crabs used for the propagation of crab seedlings are preferably derived from large bodies of natural lake water and the male and female crabs should come from different waters. Pro-crab size: Female crabs are not less than 125 grams and male crabs are not less than 150 grams.
The quality of crabs cultivated using Artemia (Artemia) is better than that of crabs cultivated with substitute feed such as freshwater quail and egg yolk. In addition, the incubation period of the big eye larvae is generally 19 to 21 days, and the water temperature at the time of emergence is about 21°C.
Do a good job of crab quality identification work (1) body color. High-quality large-eyed larvae appear light yellow in color, shiny, and transparent. There are no polymicrons or filamentous bacteria on the surface of the microscopic examination. (2) Constitution. High-quality big-eyed larvae are robust, uniform in size, have phototaxis, are fierce in feeding, have strong water resilience, and are powerful in crawling, and are quick to respond to their air blowing. Grab a small amount of crab seedlings by hand, shake the water and gently hold it into a mass, and immediately spread it after loosening it. (3) Crab seedlings specifications. The size of normal large-eyed larvae should be 120,000 to 140,000 per kilogram, and no more than 170,000 per kilogram. Crabs that have reached this size will have less fake seedlings and become young crabs more smoothly. (4) Raising water salinity and temperature. When the crabs go out of the pond, the salinity of the water body is required to be no higher than 4 ‰, the desalination time is not less than 7 days, the water temperature at the time of emergence is about 21°C, and the temperature difference between the nursery pond water and the culture pond is within 2°C and the maximum is 4°C.
Precautions (1) Before bigeye larvae go out of the pond, it is best to use drugs to disinfect once to kill pests, reduce the occurrence of diseases during the cultivation, and also can eliminate some of the crabs with poor constitution. (2) When fishing, stop feeding and use light trapping. Drain the water before packing and place it evenly in the box. (3) The early-reproductive seedlings should be transported during the day and the late-day seedlings should be transported at night. Sun protection and wind protection during transportation. Vehicles are transported to close doors and windows when driving, and to open doors and windows for ventilation when parking. Spray water once every 2 hours to increase the humidity of the crab seedling box. (4) There must be an adaptation process before the crabs enter the pool: first open the crab seedlings box, sprinkle the water on the crab seedlings for 5 minutes, soak the crab seedlings box and the crab seedlings in the pool water, and then leave the water on the shore for 15 minutes. Repeat once more and finally put the crab slowly into the pool.
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