First, strengthen feeding and management, improve wintering ability 1. Increase the proportion of non-nitrogen-containing compounds in the diet, feed the feed containing fat and sugar, feed the fish through the intensive culture and feed the fish before entering the wintering pond. Overwintering accumulates enough energy.
2. In the process of ponds and ponds, be careful to minimize the damage to the fish body, and the time of ponds is generally arranged at the temperature of the water is reduced to 5~10°C. At the same time, if you enter the species of wintering ground, you must use 5% in advance. Soak in salt water for 5 minutes to prevent the spread of disease.
Second, carefully choose the wintering waters
No matter which type of wintering waters, they are required to have the following basic conditions: the water depth of the pool before icing is not less than 2.5 to 3 meters; the bottom of the overwintering pool is not more than 20 cm thick, and the water retention is strong, and there is no leakage in the pool dyke; During the winter, it is best to have a water source, which can be filled with water and oxygen at any time. The physical and chemical properties of the water are suitable for wintering fish requirements. The transportation is convenient but it is not close to the traffic arteries. It is convenient to manage and avoid outside interference factors to the pool as much as possible. The scare of the fish; can effectively prevent the escape of fish.
Third, improve the environmental conditions of the wintering pond
1. Remove weeds and some silt so that the silt thickness does not exceed 20 cm, and use quicklime to disinfect the pond to improve water quality.
2. For the excessive density, some fish should be caught before the winter to reduce the overwintering density.
3. For wintering ponds with severe water seepage, if there is no water source for new water in winter, measures should be taken to reduce leakage.
4. All the fish live in the winter water surface, and in the autumn, to ensure the safety of the pool, water is stored as much as possible to increase the winter water level.
5. Before wintering, ice off the zooplankton with 0.5 mg/kg trichlorfon to reduce the oxygen consumption factor and ensure the growth of phytoplankton.
Fourth, master reasonable wintering density
If the overwintering fish density is too high, it will cause oxygen deficiency and suffocation, and it will also provide convenience for the spread of fish diseases. However, if the density is too small, it will affect the wintering ponds to exert their production efficiency. The appropriate wintering density should be considered in terms of the types of wintering ponds, the size and type of the fish, the conditions and equipment for wintering waters, etc. Water depth is 1 meter, generally 0.6~1.2 kg/cubic meter; there is a water stopover wintering pool with water supply conditions, and the water depth is 1 meter below the ice, which is generally 0.3~0.6 kg/cubic meter; there is no water supply condition for the water stopover wintering pool, the ice depth 1 meter, usually 0.2-0.4 kg/m3.
V. Strengthening management during wintering
1. Snow should be promptly removed after falling snow. 2. Regularly observe dissolved oxygen, carbon dioxide, hydrogen sulfide gas and ice thickness, water color, transparency, odor, etc., and keep abreast of changes in physical and chemical factors of water quality in overwintering pools, and take remedial measures in time if abnormalities are found.
3. Inspect the pool every day, check the injection, drainage, sluice gates, and stop the fish equipment. If any damage or water leakage is found, repair it in time.
4. The flow of water over the winter pool should strictly control the amount of water flow, in order to ensure that the overwintering fish need oxygen on the premise, it should be as much as possible to reduce the amount of water into the wintering pool, so as not to overwintering fish long-term swimming energy consumption, so that fish Excessive body weakened and died.
5. Doing a good wintering record and summarizing the safe wintering experience of fish.
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