Key points of management of low temperature fish ponds in winter

When the temperature is low in winter, aquaculture farmers all know that the amount of fish activity at this time is low, and the desire to eat is not strong. If the management of fish culture is ignored at this time, it is easy to cause a large number of deaths of overwintering fish, thus affecting the economic interests of farmers. The successful overwintering of fish is affected by many factors, such as the conditions of the pond, the health conditions of the fish, and the management of the pond by the farmers. Here, the pro-agricultural network summarizes several matters needing attention in the management of the fish pond in winter, hoping to provide some help to the farmers, so as to improve the survival rate of the fish and survive the winter safely.

The matters needing attention in winter fish pond management are mainly described from five aspects: pond cleaning, water injection, fish density control, disease prevention and control, and comprehensive management. let's take a look at it in detail:

Clean up the pond

The increase of silt in culture ponds and the deterioration of pond bottom can easily lead to the increase of toxic and harmful substances and cause water pollution. Therefore, removing too much silt from culture ponds in winter can significantly improve the survival rate, growth rate, yield and benefit of farmed fish. After removing the silt, it is best to expose to the sun for about 10 days, and clear the pond with quicklime to create a good overwintering environment for the fish, and then add new water. After about 10 days, the fish can be released.

Pay attention to adding water

The rainfall decreases in winter, the water level is relatively low, the pond should keep the lowest water depth above 1.5 m, and the amount of water injected should be added when the water level is too low. Water should be injected early and frequently when adding water, and the amount of water injected at one time should not be too much so as not to cause excessive changes in the water temperature of the pond and increase the activity of fish, which is not conducive to overwintering.

3. Control density

Excessive density during overwintering will not only cause hypoxia, but also easily cause fish disease. Too low density will also lead to a waste of resources, so it is necessary to determine the appropriate stocking quantity and fish proportion according to experience and practice. The pond has a water depth of 1.5 m per mu and can overwintering about 30 000 10cm fish species.

IV. Prevention and treatment of diseases

Fish diseases are often ignored in winter, but they can also bring certain economic losses. Cases that may occur in winter mainly include the following:

1. Frostbite

When the water temperature drops to 1 ℃, the fish begins to enter a state of paralysis, and when the water temperature drops to minus 3 ℃, grass carp, silver carp and bighead carp will be frozen to death. Therefore, before the advent of severe winter, deepen the pool water, do a good job of cold prevention and heat preservation, do a good job of feeding and management, improve the physique of fish, and enhance the ability of cold resistance.

two。 Oral filariasis

The oral filariasis invades the gills and skin of the fish and forms a layer of blue-gray mucus. When the disease occurs, the mixture is prepared with the proportion of copper sulfate and ammonium ferrous sulfate at 5:2. The mixture is sprinkled evenly in the whole pool with 0.7g mixture per cubic meter of water, and the fish 30min is washed with 3% salt water.

3. Vertical scale disease

During the treatment, change the water every 3-5 days, use the fresh leaves of Masson pine 15kg per mu, grind it and sprinkle it evenly in the whole pool with water 25kg.

4. Oblique tube disease

The body surface and gills of diseased fish secrete a large amount of mucus, forming a gray film, causing fish to die due to breathing difficulties, and the treatment method is the same as oral filariasis; ⑤ water mold disease, pay attention to fish fishing, transportation and stocking to avoid fish injury, treatment according to each cubic body of water with gallnut 2-3G juice 5kg, plus water 10kg evenly sprinkled throughout the pond, and 5% salt water can be used to wash fish 5min.

V. strengthening management

Do not ignore the management work and check the status of fish activities in a timely manner. The lack of sunlight in winter and the weakening of photosynthesis of phytoplankton often lead to insufficient dissolved oxygen in the culture environment, and attention should be paid not to apply organic fertilizer to reduce the consumption of dissolved oxygen and prevent fish from lack of oxygen in winter; fish did not stop feeding completely during the overwintering period. in high temperature, warm and windless weather, a small amount of bait is given according to the actual situation; often patrol the pond and solve the problem in time.

The above is introduced by the pro-agricultural network about the management of fish ponds during the low temperature period in winter. I hope that by reading this article, farmers can strengthen the management of fish ponds and improve the survival rate of fish overwintering so as to improve their own economic benefits.