At present, it has entered the cold dew season, farmers should take appropriate effective measures based on the actual situation, can increase the survival rate of winter fish species.
I. Appropriate site selection
(1) Choose fish ponds with sunny leewards and abundant water sources as wintering ponds, generally 3 to 5 mu, and the water depth should be 2 to 4 meters, which will help enhance the thermal insulation performance; (2) The water retention and fertilizer retention performance is good, with loam or sticky The quality of soil substrate is better, the bottom of the pool is flat, the less the water grass and silt, the better, the sludge is no more than 30 cm thick; (3) The water body is selected as yellowish green or oil green; (4) There is industrial sewage or a large amount of domestic sewage The inflow should not be used as a wintering pond.
Second, the density is suitable
As the water temperature decreases, the amount of fish activity decreases accordingly, and the oxygen consumption also decreases accordingly. Therefore, the density of overwintering fish species may be appropriately greater than the feeding period. Breeding density is generally limited to when the oxygen content of the water is reduced to 3 mg/l, preferably above 5 mg/l as a safety factor. Select large-scale species of fish, requires a healthy, plump, cold-resistant and strong hypoxia, the general species in more than 10 cm, not only can increase the ability of fish species to escape predators, but also can reduce the mortality rate is low.
Third, the disinfection of fingerlings
Before entering the overwintering pool, the fish species shall be sterilized with quicklime clear ponds, and the fish shall be put into the pond after the drug effect is passed. When entering the pond, the fish body shall be soaked with 5% salt solution for 5 minutes. Careful attention should be paid during the pooling process to avoid bruising, scraping or stepping on fish.
Fourth, keep the water temperature
The temperature of the overwintering fish pond should be kept below 4°C. Before the cold begins, the following methods can be used to increase the water temperature: (1) adding new water; (2) spreading rice straw on the water surface; (3) laying a windproof shed on the north side of wintering pond to keep warm; (4) investing in a litter Piles of rice straw under the pond; (5) In order to maintain water quality, every 7-10 days per mu of water can be applied to livestock manure 110-150 kg, after the manure can increase the water temperature, favorable for cold and warm fish species. Tangshui should pay attention to maintaining a certain depth. The deeper the water is, the smaller the pond water temperature changes and the safe wintering of the fish species. General pond water depth should be maintained at 1.5-2 meters.
Fifth, reasonable feeding
Generally warm-water fish, when the water temperature drops to about 10 °C, although their appetite has an impact, there is still a certain demand for fertilizer and feed. When the water temperature drops to 7°C, the fish will also eat a small amount, and when the water temperature drops to 4°C, the fish species will be dormant. Therefore, after entering the winter, the fish species still need to feed more feeds rich in fat and protein, such as peanut bran, wheat bran, rice bran, etc., to ensure adequate energy storage for body fat, protein, etc., and to enhance the cold resistance of the fish body before winter. Ability to improve winter survival rate.
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