Is it easy to raise mandarin fish in winter? Before overwintering, we should reduce the breeding density and build overwintering ponds.

Mandarin fish is not easy to raise in winter, because the best water temperature for mandarin fish growth is about 20 ℃, and the lower temperature in winter affects the growth of mandarin fish, so it is necessary to build overwintering ponds and merge ponds when the water temperature is more than 10 ℃. Before overwintering, mandarin fish should be kept sparsely to reduce the culture density, and mandarin fish of certain specifications can be caught and sold. After snowing, the snow should be cleared in time and necessary anti-freezing measures should be taken.

1. Construction of overwintering pool

Winter mandarin fish culture needs to build overwintering ponds, should choose leeward to the sun, less silt on the sandy bottom of the pond culture, an area of about 1.5-3 mu, more than 2 meters deep, good drainage and irrigation conditions, no pollution, good water quality and a small amount of submerged aquatic plants fish ponds, pay attention to raising mandarin fish is not suitable for acid ponds and ponds where the water is easy to muddy.

2. Control the number of bait fish in the pond.

The pond merging is generally carried out on a sunny day with a water temperature of 10 ℃, with high water temperature, strong transport power of fish and high consumption of oxygen. in this process, fish are easy to get hurt, and too low water temperature is not suitable for merging ponds to prevent fish from freezing to death. The species of mandarin fish in the adult pond can be merged with the catch of adult fish, and attention should be paid to prevent the death of mandarin fish species caused by hypoxia when pulling the net. The number of bait fish in the pond should be controlled half a month before pulling the net, and care must be taken not to harm the fish in the process of fishing, fishing, fish selection and transportation.

3. Temperature

The optimum water temperature for mandarin fish culture is 20 ℃, the best temperature for mandarin fish growth and feeding is 22-28 ℃, and the best water temperature for reproduction is 21 ℃. The growth of mandarin fish is slow because of low temperature in winter.

4. Culture density

Before overwintering, we should raise mandarin fish sparsely in boxes or ponds according to the size of mandarin fish, reduce the culture density, then discharge half of the old water in the pond, inject new water to about 2.2, and maintain a certain water temperature, which is conducive to the normal growth of mandarin fish.

5. Prevent the cold in time

The temperature in winter drops fast, the range is large, the duration is relatively long, and extreme low temperature weather often occurs. We should take protective measures in advance so as not to bring unnecessary losses. Mandarin fish of certain specifications will be caught and sold in time before overwintering, and the breeding grounds will be carefully checked to prevent leakage. In winter, the snow should be cleared in time, and if there is ice, it should be broken in time to ensure that there is enough dissolved oxygen in the water.

6. Disease prevention

Remove ice and snow in winter gently, do not touch the fish, easy to cause fish disease, we should prevent fish disease in advance, we can use 100-150ml povidone iodine per mu to sprinkle, can also take Cordyceps sinensis to prevent parasites, pay attention not to use trichlorfon.