First of all, it is a good time to take advantage of the double-sections to achieve the early sale of fish of commercial specifications in order to return funds. If the market for supply of aquatic products exceeds demand, and prices are really low, they can be raised temporarily to avoid off-season sales. However, in the sale of commercial fish, we must grasp the heat, do not commit "satisfaction" of reluctant sellers, when the shot to sell it, to fight for a suitable price.

Second, we must use the winter time before and after the Spring Festival to calculate the cost of production for one year, and make profit calculations, and do a good job of annual summary. It is necessary to select the best breeding mode and production mode from the annual summary, and sum up the successful experience and the lessons of failure in order to lay a solid material foundation for the new year's fishery production.

In addition, we have the following things to do.

1. Winter fish management. To strengthen the feeding and management of the upcoming listing of adult fish, especially to do anti-theft work, do not cause an accident due to a momentary negligence, resulting in "abundance of bumper crops."

2. Fish species wintering management. It is necessary to strengthen the overwintering management of fingerling production, deepen the pool water, and do a good job of wintering over the pond.

3. Fish pond excavation and regulation. To conduct comprehensive planning and design of newly excavated fishponds, we must choose places that are convenient for drainage and drainage, have good water quality, and have convenient transportation.

4. When the fisherman does not miss the fishery, complete the pond dredging and renovation work in time. In recent years, some fishpond contractors have only paid attention to the benefits in front of their eyes, and they have devoted their efforts to seeding, feeding, and fertilizing. They have neglected the necessary dredging work. Year after year, the silt in the bottom of the pond has grown thicker and thicker. The general ponds The thickness of silt is about 40cm. Some intensive ponds and ponds close to villages and towns have thicker sediments, leading to deterioration of the ecological conditions of the pond. The harms are mainly in the following aspects:

1) Shallow the pond, reduce the water load, and reduce the water space of fish life, which directly affects the fish yield per unit area.

2) Cause the oxygen in the pond water. Because the sludge contains a lot of organic matter. In the summer and autumn high temperature seasons, organic matter is oxidized and decomposed under the action of bacteria, and continuously consumes a large amount of dissolved oxygen in the water. This often results in the exhaustion of dissolved oxygen in the lower water layer of the pond, resulting in the lack of oxygen. Under anaerobic conditions, anaerobic bacteria multiply, producing ammonia, hydrogen sulfide, and organic acids that are harmful to fish. These substances are strongly anaerobic, causing the pool water to lose its “oxygen debt” and exchanged with the convection of the upper and lower pools at night. Caused by the lack of dissolved oxygen in the entire pond water, pool fish anoxic floating head. In the event of continuous rain, low pressure, hot weather, thunderstorms, or northerly winds and other undesirable weather, the oxygen deficit in the fish pond is even more serious and the flooding of fish ponds can easily occur.

3) A large amount of nitrogen-containing organic matter in the sludge, regardless of aerobic decomposition under the action of nitrosobacteria, or anaerobic decomposition under the action of nitrifying bacteria, the final product of both is ammonia. Ammonia is very toxic, and even low concentrations can inhibit the growth of fish and other aquatic organisms.

4) There are many fish parasites and pathogenic microorganisms in the sludge. When pond water quality deteriorates, acidity increases, and the environment deteriorates, the disease resistance of fishes declines, and pathogenic microorganisms, etc., have a large number of breeding and spreading, leading to outbreaks and epidemics of fish diseases and causing losses. In recent years, the occurrence of fishy outbreaks of small ponds and reservoirs such as fleas and maggots has a direct relationship with the serious silting of ponds.
According to the survey, the siltation of fish culture ponds generally increases at a rate of 5-10cm per year. Intensive ponds and ponds with sewage flowing into the villages and towns have a faster deposition rate. Pond silting has become a major factor restricting pond production. one. Pond fish farming should continue to produce high yields, and the winter dredging work must go ahead.

5. Production arrangements. According to market demand, choose aquaculture mode and breeds according to local conditions, rationally arrange the stocking plan, and timely fish species. Many farmers are accustomed to stocking after the Spring Festival. In fact, this is not scientific. In spring, the temperature gradually rises and the scales of the fish are loose. Due to the reasons such as pulling the net, transporting and putting it in, the fish body is easily injured and affects the survival rate of the fish species. For a friend who wants to raise grass carp, grass carp can be injected at this stage.

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