Nowadays, the production of farmed fish has been greatly developed, but the wintering techniques for cultivating fish and fish species have not yet been mastered by the vast number of fishermen. In fact, it is not difficult for the fish species to survive the winter. As long as effective measures are taken, the survival rate of the species can be improved.
First, to eat food and water conservation of general water fish, when the water temperature dropped to about 10 °C, although its impact on appetite, but its digestive function is not very weak, there is still a certain demand for bait. According to experiments, when the water temperature drops to 7°C, the squid and squid will also have a small amount of filter food. Grass-eating fish will also float to the surface to eat grass (white cabbage leaves and other green materials). When the water temperature drops to 4°C, the fish species will sleep. status. In most parts of the south of the Yangtze River, the low temperature of the water is not very long. If the fish species enter the winter, they will not eat, so that they are hungry, and only rely on the storage of body fat, protein, etc. before wintering. To maintain and survive the long winter, this is already not enough to consume 10 to 13 cm long fish species.
Second, the density should be moderate With the decline in water temperature, fish activity is reduced accordingly, oxygen consumption is reduced, so the density of overwintering species can be greater than the feeding period. However, it is not possible to blindly increase the density. At the same time, different types and specifications of fish species have different oxygen consumption, and there should be room for stocking. Generally, the oxygen content in water is reduced to 3 mg/L, but the phytoplankton oxygen emission in winter is also low. It is better to control the oxygen concentration above 5 mg/L as a safety factor. According to experiments, when the water temperature is 2 to 4°C and the dissolved oxygen is 1 mg/l, the fish will have difficulty in breathing and will be overly dense. In the event of severe hypoxia, a large number of dead fish will easily occur and cause losses; the fish will be kept low for a long time. The oxygen environment is also detrimental to their physiological mechanisms. The management should regularly measure dissolved oxygen in water.
Whether the stocking density of overwintering species is better depends on the size and species of the species, the conditions of the fish pond, and the underground location. In the area south of the Yangtze River, the species size is about 11cm, the water depth is 1.5 meters, and the general release is 1.5 to 20,000. If the water source conditions are good, the mud in the pond is less, some can be put in more; the water depth is less than 1.5 meters, and the fish species specifications are 13 ~20cm, fish ponds difficult to enter, their stocking capacity should be reduced by about 20%.
Third, keep the antifreeze dead Although the fish is a variable temperature animal, but when the water temperature dropped to 1 ~ 0 °C, the general warm water fish into paralysis. According to experiments, when the water temperature is below 0.5°C, the fish will immediately die. Therefore, the temperature of the overwintering fish pond should be kept at a minimum of 4°C.
Due to the natural climate change, some regions are cold and there are long-term frosts. During this period, some measures can be taken to increase the water temperature. 1 Add new water to increase the water temperature; 2 Spread the straw on the water; 3 Set up a wind barrier on the north side of the wintering pond; 4 Put pigs and cow dung on the water near the pond. These insulation measures should be done before the onset of the cold.
First, to eat food and water conservation of general water fish, when the water temperature dropped to about 10 °C, although its impact on appetite, but its digestive function is not very weak, there is still a certain demand for bait. According to experiments, when the water temperature drops to 7°C, the squid and squid will also have a small amount of filter food. Grass-eating fish will also float to the surface to eat grass (white cabbage leaves and other green materials). When the water temperature drops to 4°C, the fish species will sleep. status. In most parts of the south of the Yangtze River, the low temperature of the water is not very long. If the fish species enter the winter, they will not eat, so that they are hungry, and only rely on the storage of body fat, protein, etc. before wintering. To maintain and survive the long winter, this is already not enough to consume 10 to 13 cm long fish species.
Second, the density should be moderate With the decline in water temperature, fish activity is reduced accordingly, oxygen consumption is reduced, so the density of overwintering species can be greater than the feeding period. However, it is not possible to blindly increase the density. At the same time, different types and specifications of fish species have different oxygen consumption, and there should be room for stocking. Generally, the oxygen content in water is reduced to 3 mg/L, but the phytoplankton oxygen emission in winter is also low. It is better to control the oxygen concentration above 5 mg/L as a safety factor. According to experiments, when the water temperature is 2 to 4°C and the dissolved oxygen is 1 mg/l, the fish will have difficulty in breathing and will be overly dense. In the event of severe hypoxia, a large number of dead fish will easily occur and cause losses; the fish will be kept low for a long time. The oxygen environment is also detrimental to their physiological mechanisms. The management should regularly measure dissolved oxygen in water.
Whether the stocking density of overwintering species is better depends on the size and species of the species, the conditions of the fish pond, and the underground location. In the area south of the Yangtze River, the species size is about 11cm, the water depth is 1.5 meters, and the general release is 1.5 to 20,000. If the water source conditions are good, the mud in the pond is less, some can be put in more; the water depth is less than 1.5 meters, and the fish species specifications are 13 ~20cm, fish ponds difficult to enter, their stocking capacity should be reduced by about 20%.
Third, keep the antifreeze dead Although the fish is a variable temperature animal, but when the water temperature dropped to 1 ~ 0 °C, the general warm water fish into paralysis. According to experiments, when the water temperature is below 0.5°C, the fish will immediately die. Therefore, the temperature of the overwintering fish pond should be kept at a minimum of 4°C.
Due to the natural climate change, some regions are cold and there are long-term frosts. During this period, some measures can be taken to increase the water temperature. 1 Add new water to increase the water temperature; 2 Spread the straw on the water; 3 Set up a wind barrier on the north side of the wintering pond; 4 Put pigs and cow dung on the water near the pond. These insulation measures should be done before the onset of the cold.
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