Wintering Management of Freshwater Whitefish Seeds
Freshwater white plage is a kind of tropical fish. Its main growth optimum temperature range is between 21-32°C. The optimum temperature range is 28-30°C. When the water temperature is 16°C, the white peony begins to eat a small amount, and the fish body at 12°C. Disequilibrium disorders cause death at 10°C, and water temperatures during overwintering are too low, which can lead to weakened fish disease resistance and cause disease, especially during the overwintering period in the early winter and spring. In October, the seedlings will generally enter the critical period of wintering. Therefore, the management work before the winter must be done:
First, clear pond
The wintering ponds for the stocking of white pelicans are generally required to have 2 acres and a water depth of 2 meters or more to ensure the water temperature is stable. The ponds must be cleaned before hatching to kill the harmful organisms in the pond. Generally, quick lime 200-250 should be used. Jin/mu is cleared and the insecticide is sprayed with 30 ml/mu to kill the disease and insects. After one week, the seed can be placed.
Second, feeding
During the October-November period before wintering, the white peony seedlings need to be fed before wintering in order to enhance their fitness and improve their resistance to diseases. Generally, they are fed with high-energy feeds, such as maifupi, soybean cake, etc. Feed 5% of the fish's body weight.
Third, the amount of stocking
The density of seedlings placed in the wintering ponds is generally controlled at about 30,000 tails/mu, to prevent the density from being too high and the water quality is prone to deterioration. At the same time, about 500 tilapia fingerlings can be placed per acre.
Fourth, fish disease prevention
Overwintering ponds of white pelicans must pay attention to the prevention of fish diseases, because once the disease, the treatment there is a certain degree of difficulty, prevention should be strengthened in order to ensure safe winter.
1. Be sure to carefully handle the fish in wintering ponds to avoid fish injuries. Before entering the wintering pond, dip 3% in saline for 10-15 minutes to kill the pests on the surface of the fish and prevent them from entering the wintering pool.
2, to prevent grass carp mixed into the winter pool, because grass carp is easily Jiujiang first slot locust parasites in the intestine, the eggs ejected into coccidia, its middle host is the sword water cricket, white quail seedlings feeding sword leeches, Can cause a large number of parasites Jiujiang first slot death.
3, once a week to use a drug to prevent, bleaching powder and mercuric nitrate can be alternately, the method is:
Dried Squids,Dried Cuttlefish,Dehydrated Squid,Dry Calamari
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