Management of overwintering in ponds of cultured freshwater Pomfret seedlings
1. Wintering pond preparation
Area 600~1500 square meters, pool depth 1.5 meters, pool water Nanjing Pukou District area for hot spring water, micro-inflow pool, inlet pipe 10 cm, bottom silt thickness 10 cm. After disinfection of the dry pool, water is added. Each pool is equipped with two 3 kW aerators.
2. White pomfret seed stocking
Stop feeding water three days before stocking, so that the water temperature of the overwintering pond is close to that of the pond, and the temperature difference is within 2 degrees Celsius. In Nanjing area, fry are usually caught at the end of September and the beginning of October. After fry are bathed in methylene blue 0.2ppm for 10~15 minutes, they enter the overwintering pond for overwintering. About 180 fish are stocked per cubic meter of water.
3. feeding
After entering the pond, the white pomfret was fed with floating feed with protein content above 30%, 3~4 times a day, and the daily feeding amount was 3~4% of the fish weight.
4. daily management
During winter, the water temperature is controlled at 26~28 degrees Celsius, and the water flow is stable. Regular sampling, check fish growth and feeding conditions, and microscopic examination of pests. At the later stage of overwintering, the fish load in the pond increased, and an aerator was started, which did not stop for 24 hours except when feeding.
5. Overwintering specification control
Colossoma brachypomum has strong feeding ability and large individual growth disparity. During the overwintering period, it is advisable to adopt the feeding mode of small amount, fixed point and long time, so as to avoid the excessive disparity of white pomfret specifications and improve the utilization rate of feed. Each cubic meter of water generally can be out of the pond overwintering species about 15 kg.
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Preparation before adult culture of freshwater white Pomfret
one。 Under pond conditions, the area of adult freshwater Pomfret culture pond is 10 mu, and the water depth is about 1.8 meters, which requires sufficient water source, fresh water quality, convenient injection and drainage, flat bottom and less silt. two。 Clear the pond and disinfect the dry pond at the end of the year to get rid of too much.
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Prevention and control of water mildew in cultured freshwater Pomfret during overwintering
1. The most common diseases of freshwater white Pomfret during overwintering are water mildew, melon disease, rotifer disease, oblique tube disease, etc., especially melon disease, which is easy to cause explosive death. The causes of various fish diseases are due to
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