Analysis on the main points of overwintering techniques of freshwater Pomfret fry

White Pomfret is a kind of freshwater fish 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 a warm water fish, it needs to grow in a water temperature of 15-30 degrees, once the water temperature is lower than 12 degrees, it will freeze to death, especially the seedlings, so it is very important for winter management when breeding, so how do Pomfret fry survive the winter? Let's take a look.

I. the method of cultivating Pomfret fry

The main results are as follows: 1. The fry culture pond of freshwater Pomfret requires an area of 1000-1500m, a depth of 1.5m and 1.8m, with a flat bottom and a small amount of silt. the fry should be cleaned thoroughly 7 days before entering the pond. Choose sunny weather to release fish fry, pay attention to the difference in water temperature between new and old environment not more than 3C, it is best to keep it. Production is usually clear water into the pond, and the operation should be careful, light and fast, and the stocking density is 150 ~ 200 layers / m.

3. Take good care of the fry within three days after putting it into the fry list. Sprinkle more egg yolk milk and soybean milk. Later, with the increase of plankton in the pond, you can only feed soybean milk and later add soybean cake paste.

4. During the whole fry cultivation period, the water level should be injected in batches to increase the water level from 0.6 m to 1.2 m. When injecting water, it is necessary to prevent enemy organisms from entering the pool with the water. The combination of water injection and fertilization can keep more plankton in the water for fish fry to feed on without deteriorating the water quality.

5. After about 20 days of cultivation, when the specification reaches 2.5~3.0cm, it is necessary to carry out net-pulling exercise. It usually takes 2 dragging exercises, and 3 times for long-distance transportation.

2. ways of overwintering conservation of white Pomfret

1, the water quality is good, the water temperature is suitable, can carry on the freshwater white Pomfret species overwintering, such as power plant surplus hot water, underground hot spring water, southern glass greenhouse and so on.

2. When the water temperature of low temperature conservation type was kept at 18 ~ 23C, the fish basically did not grow, and had a definite inhibitory effect on the growth performance in the future.

3. The water temperature of the suitable temperature cultivation type was kept at 24 ~ 32C, and the fish fed and grew normally.

Matters needing attention for White Pomfret overwintering

The main results are as follows: 1. When the external water temperature is about 20C, the water temperature difference between the new pool and the old pool does not exceed 2C.

2. The specification and stocking density of freshwater Pomfret overwintering species were determined according to the overwintering form and requirements.

3. Soak in methylene blue of 0.2g/m2 for 10 minutes for 15 minutes before entering the overwintering pool, and sprinkle it with the mixture of copper sulfate and ferrous sulfate 2-3 days after the human pool.

4. During the whole overwintering period, attention should be paid to the regulation of water temperature and water quality, and feed should be fed on time.

All right, the above is the white Pomfret fry overwintering technology brought by the editor of Tuliu.com. I hope it will be helpful to see it. Friends who like it are welcome to follow Tuliu.com. We have more breeding techniques to share and wait for you to discover.