How to deal with the extremely cold weather when the cold wave goes south and the temperature drops below zero for fish farming

Recently, under the influence of the cold wave to the south, the minimum temperature in many places in the south has dropped to nearly minus 8-9 degrees Celsius. Experts remind fish farmers: low temperature and extremely cold weather, to pay close attention to the weather, do a good job of fish ponds cold response measures.

Fish culture in winter

1. Deepen the water level of the pond as much as possible to prevent fish frostbite due to low water level. When the water level of the pond drops greatly and the water is too shallow, the water temperature is easy to drop suddenly. Therefore, it is necessary to replenish new water in time, on the one hand, to ensure that the pond water body has a suitable water level and water temperature; on the other hand, it can improve the water quality and increase the dissolved oxygen. However, when adding new water, we should be careful not to make the new water form a double layer and cause double ice, which is easy to cause serious hypoxia under the ice and cause fish asphyxiation.

two。 Pay attention to the freezing of the pond. Once the ice is found, the freezing period of the water body should be shortened as much as possible. Before the pond surface is frozen, whether it enters or discharges is determined according to the water temperature of the source and the water temperature of the aquaculture water body, so as to ensure that the water body has a higher water temperature as far as possible. Postpone the freezing time of the water surface.

3. Do not catch the Dora net in a snowy day, but pull the net quickly to reduce fish damage. During the overwintering period, fish rarely or stop feeding, the amount of activity decreases, the level of metabolism decreases, the growth rate slows down, and the disease resistance decreases. Dora NetEase causes fish body damage, and the fish surface is easy to be infected with water mildew.

4. Pay attention to the safety of fishery facilities: greenhouse plastic greenhouses and general simple houses should remove snow in time to prevent excessive snow from collapsing; pond culture should check whether the inlet and drainage channels are unblocked; greenhouse soft-shelled turtle and tropical ornamental fish culture should pay attention to pipeline safety to prevent gas outage, power outage and water outage caused by freezing.

5. Increase the number of pond patrols and pay attention to observing the activities of aquatic products. During the heavy snow period, it is necessary to appropriately increase pond patrol and do a good job of preventing cold from wintering. During the overwintering period, as long as the water level is deep enough (2.5-3m), the four big fish can survive the winter safely. However, some tropical and subtropical fish, such as freshwater Pomfret, Egyptian moustache catfish, tilapia, etc., will be frostbitten and even die in large numbers when the water temperature is below 10 ℃. They should be kept warm in greenhouses, greenhouses, or geothermal factories. Therefore, once abnormal fish activity is found, timely measures should be taken.