Five strokes can help fish species safe winter
At present, it has entered the season of cold dew, and local aquaculture households should take appropriate effective measures according to the actual situation to increase the surviving rate of winter fish. Appropriate site selection (1) Choose fish ponds with sunny leewards and abundant water sources as wintering ponds, generally 3 mu to 5 mu, and the water depth should be 2 to 4 meters, which will help enhance insulation performance; (2) Good water and fertilizer retention performance The best is loam or clay soil, the bottom of the pool is flat, the less the water grass and silt, the better. The silt is no more than 30 cm thick; (3) The water body is yellowish green or oily green; (4) There is industry The influx of sewage or a large amount of domestic sewage should not be used as a wintering pond. With the appropriate density, the water activity will decrease with the decrease of water temperature, and the oxygen consumption will also decrease accordingly. Therefore, the density of overwintering species may be larger 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 fish species, requiring a healthy, plump, strong resistance to cold and hypoxia, the general species more than 10 cm, not only can increase the ability of fish species to escape the enemy, but also reduce mortality. Before the fish fingerlings enter the overwintering pool, they 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 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. Keep the temperature of the water over the winter fish pond at a minimum of 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 days to 10 days per mu of water can be applied to livestock manure 110 kg to 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 meters to 2 meters. Reasonable feeding generally warm-water fish, when the water temperature dropped to about 10 °C, although its 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. Aspirating Smoke Detector,Aspirating Smoke Detection And Alarm System,Aspirating Smoke Detector System,Smoke Detector Alarm System LIAONING YINGKOU TIANCHENG FIRE PROTECTION EQUIPMENT CO.,LTD , https://www.tcfiretech.com