The construction and facilities of the cement pool are done according to the methods described above. The cement ponds for rearing seedlings are preferably about 10 to about 10, and they are usually stocked at 300-400 tails/inch. The cement pools with micro-flowing water can be put at 400-500 tails/inch. The water level is controlled at 30 cm and can be controlled at 50 cm when the heat is hot in summer.
2. Large plastic box raising seedlings
The white plastic box used for general food packaging is 50 cm long, 30 cm wide and 30 cm high, or 60 cm long, 40 cm wide and 30 cm high. A hole with a diameter of 1-1.5 cm is drilled at 20 cm on the wide side of the plastic box, and a plastic tube with a diameter of about 15-20 cm is installed as an overflow port. The mouth of the pipe was sealed with a sieve cloth to prevent the seedlings from fleeing. In general, 100-200 tails are placed in each box, and more water can be added.
3, pond raising seedlings
The construction and facilities of the pond are done according to the methods described above. Anti-escape facilities must not run seedlings, the general use of mesh cloth to do the outer layer, nylon screen cloth to do the inner layer, two layers of anti-escape net cloth cover outlet. The pond area for raising larvae should not be large. The area of ​​the pond is preferably 20-100?, and the general stocking density is 200-300 tails/?, and the micro-flowing pond can be set to 300-400 tails/inch.
In the three farming methods, the shelter for the seedlings shall be set in the breeding place, and the disinfected plants shall be placed in the cement pool and the pond (20 Kg per cubic meter of water per 20m of potassium permanganate for 20-30 minutes, or two Oxygen chloride 3 grams per cubic meter of water, or bleaching powder 10 grams per cubic meter soak for 15-20 minutes), water grass to water hyacinth and water lettuce is better, put the water plant area accounted for 1/2-1/3 of aquaculture water surface The plastic box is put into the sterilized brown silk or hemp (Brown silk, hemp silk is also soaked with the above-mentioned medicines, but also wash and soften). Cement ponds and ponds are suitable for large-scale batch feeding of seedlings, and plastic boxes are suitable for raising seedlings in small batches.
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