Nursery facility preparation Nursery facilities for artificial breeding of S. sinica include nursery rooms, nursery ponds, crab breeding ponds, bait culturing rooms, water supply, gas supply, warming, water quality analysis, biological monitoring rooms, and attachments.
Nursery room nursery pools, bait culturing rooms, water supply, aeration, warming, water quality analysis and biological monitoring rooms and other facilities. It is better to use 20 cubic meters to 30 cubic meters of water.
The scallop culture cage can be used as an attachment device, and the shellfish detacher made of a brown rope, etc., can also be made of feather-shaped artificial seaweed made of green plastic lines, and the length is about 1.8 meters. The larvae can also be used in the breeding of nets to prevent residual nets. The nets are usually 20 mesh screen nets or sieve nets. The length is generally 1 meter, and the length can be adapted to the size of nursery ponds, generally 1 to 4 meters. The quantity can be increased or decreased according to the size of the larvae in the nursery pond. In general, 0.5 cubic meters to 1 square metre of remnant nets are placed per cubic meter of water, and the time for the best placement is before the metamorphosis of the big eye larvae.
Preparation of a pro-crab breeding pond The cultivation pond may be a cement pond or an earthen pond, and a cement pond is generally used, either indoors or outdoors. In the production room, shrimp breeding ponds can also be used, with good results. Outside the pool, there must be rain and shading facilities. The bottom of the pond is laid with 8 to 10 cm of fine sand, and a "crab house" made of bricks and stones that have been soaked for more than one day is used for the pro-crab residence. If necessary, shading facilities are provided at the top of the pool. The wall of the earthen pond is made of stone or concrete, and the bottom is made of sand or gravel. There must be less silt or humus. The inclination of the bottom of the pool towards the gate is large, which facilitates drainage and irrigation, and can open up the trial beach. The fluctuation tide can be used to change the water.
For small-scale crab culture, water tanks, casks or plastic buckets with a water capacity of 0.5 to 1 m3 can be used. Covers are covered or lids are provided to prevent rain or sun exposure. The bottom is also covered with sand. .
Before pro-crabs enter the pool, new cement pools must be soaked in water for more than one month before they can be used; the old pools must be cleaned with the walls and bottom of the pool first, and then disinfected with drugs. It is usually soaked in 50-100 g/m3 of water for 1 hour with a bleaching agent with an effective chlorine content of 30% to 35%, and then rinsed with clean seawater.
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