Wintering Breeding Management
Wintering management of fingerlings To ensure safe wintering and improve the survival rate of fingerlings, the overwintering management of fingerlings becomes an important part of fishery production. First, the preparation before winter 1, the choice of wintering pool. The wintering pond is best chosen in a relatively quiet place, with an area of ​​2-4 mu, and ample water. The sediment is about 20 centimeters deep and the water depth is about 2 meters. In the first half of the release of fish, the pool water was allowed to dry and dried for three to five days. After that, 50-75 kg of lime were used per acre to adjust the slurry into the whole pond and sprinkle fertilizer. 2. Intensive cultivation of overwintering species. After the fall, we must feed more palatability-enriched protein- and fat-rich concentrates to increase the fish's fatness and enable it to survive winters. In general, the overwintering species requires a size of 10 cm or it will affect the survival rate. 3, entering the pool and quarantine disinfection. Timely access to the pool has a great influence on the overwintering effect of fish species. Generally, the water temperature enters the pool at 10°C, and the fish is washed with 2%-5% saline or 10ppm bleach for 15 minutes to avoid fish diseases in the wintering pool. Spread in. 4, stocking density. Per-mu stocking of 10-13 cm fish species of 3-50000 or 0.3-0.6kg of fish per cubic meter of water. Second, feeding and management 1, water quality: the transparency of wintering pool water is generally maintained at 50-80 cm can be, if the water quality is too fat, water can be replaced by water solution; too thin, can be fertilized fertilizer water quality, 2 meters water depth per acre Ammonium nitrate 5-6 kg, superphosphate 3-4 kg. 2. Feeding: By top dressing, cultivate the amount of phytoplankton. At the same time, in the warm weather, it is appropriate to feed according to the species activity. 3. Others: In case of snow freezing, oxygen should be removed by removing ice from the snow, so that the dissolved oxygen in the water is not less than 1 mg/L, and the snow removal area is not less than 80% of the total water surface to ensure the conditions required for photosynthesis. At the same time, stepping up the ponds to inspect the activities of fish and other organisms in the water. Third, the disease prevention and control of this period, there are red-peel disease, water mold disease. Red skin disease: every 1 to 20 days with 1ppm bleach Quanchiposa, when the sunny day temperature is higher, sulfathiazole baits; Saprolegnia: can be used to dip the diseased fish with 4% saline for 5 minutes, per acre with calamus 5-6 kg, salt 1 kg, 15-40 kg of urine against Quanchiposa.
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