Overwintering technique of Pomfret fry

White pomfret is a freshwater fish species introduced into China in the last century. It has excellent meat quality, fast growth, suitable for rough culture, easy to manage, and large market demand, so it is deeply loved by consumers and farmers. But it is warm water fish, need to grow in the water temperature of 15-30 degrees, once the water temperature is lower than 12 degrees will freeze to death, especially seedlings, so in the breeding of winter management is extremely important, then how do white pomfret fry winter? Let's take a look.

1. Choose the venue

When breeding white pomfret, the water level of the breeding pond should be above 1.5 meters, and the water temperature can be kept at 12 degrees in winter to prevent fry from freezing to death. The area should be 2-4 mu, and it is best to have sufficient sunlight, convenient water source and leeward site. If it is the condition can choose in the pond to have rich underground hot spring area, so that can perfectly solve the problem of water temperature.

2. Build a cold shelter

General breeding ponds do not have underground hot spring water, so it is necessary to build a cold shelter when breeding, so that white pomfret can safely winter. At present, many farmers choose to use small galvanized pipes to build cold-proof sheds, weld small galvanized pipes into a half-moon shape with angle iron, fix them on the pond, and cover the welded shelves with thin films. The area of the construction is dipped in the general or one-third of the whole pond. Many farmers use straw and other crop straws to build, or cultivate duckweed, algae and other aquatic plants on the water surface, which can play a role in cold-proof. However, there is no need to build any cold-proof measures if there is an underground hot spring breeding environment.

3. Feed feeding

The choice of feed and feeding method are the key to whether the white pomfret can safely overwinter. The feed should be rich in crude protein, and the crude protein content should be more than 30%. When the water temperature is above 20 ℃, feed twice a day, respectively in the morning and afternoon when the sun is sufficient, each feeding amount is between 4%-5% of the fish weight; when the water temperature is 15-20 ℃, the water temperature is low, the activity of the white pomfret is low, so only feed once a day, each feeding amount is also lower than the water temperature is 20 ℃, accounting for 2%-3% of the fish weight; When the water temperature is lower than 15 degrees, there is no need to feed. When feeding, it is best to time, quantify and locate, and ensure the freshness of feeding. Do not feed corrupt and deteriorated feed.

4. Water quality management

Water quality management is the most important aspect of freshwater fish culture. In winter, the temperature is low, the microorganisms and bacteria in the water reproduce slowly, and the metabolism of white pomfret is also slow, so the water quality is very easy to change, resulting in less nutrition in the water. At this time, it is necessary to put completely decomposed organic fertilizer in the water body, such as pig manure or chicken manure, so that the water quality becomes fertile, tender, alive and refreshing, and accelerate the growth of white pomfret.

5. Other

Pay attention to the prevention and control of diseases during breeding. Although the occurrence rate of diseases is low due to low temperature in winter, it is still not to be taken lightly. In winter, it is water mildew and small melon worm disease. The prevention and control method is to disinfect the pond before seedling release. Strengthen water quality management during breeding, reduce breeding density, and prevent bacteria invasion and infection caused by fish swimming friction. Water mold disease can be used when the whole pool of potassium permanganate solution of low concentration sprinkling, and small melon worm disease is parasitic disease, the disease can be used after boiling soup of dried pepper and dried ginger slices for the whole pool sprinkling treatment. When white pomfret overwinters, try not to interfere with the fish population, so as not to be frightened and cause collision, causing mechanical damage, and it is easy to avoid using trichlorfon and other drugs, otherwise the whole pool will die.

The above is the white pomfret seedling winter technology all content, hope to help you, want to know more fish farming knowledge, please pay attention to us.