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Under normal circumstances, the time for winter fish species should be between the winter solstice and the second year of spring. The technical points are:
First, clear pond disinfection should be in the 10 days before the release of fish species, select sunny weather. There are two ways: First, dry pond method. Remove the water in the fish pond, leaving only 10 cm, 80 kg to 100 kg of lime per acre, or 4 kg to 5 kg of bleach containing 30% chlorine, dipping water to Quanchiposa; second, carry water. . In the case of a depth of 1 meter in fish ponds, 150 kg of lime are used per acre, or 1 kg to 13 kg of bleaching powder containing 30% chlorine is used to splash the whole water.
Second, the basal fertilizer to cast manure and animal dung is better. The old fish ponds have 5 to 10 lbs per acre of water. The new fish ponds should be given more than necessary to increase fertility.
Third, the selected fry fry should be selected tail fat, complete scales, non-destructive fins, beating powerful, the best fry specifications are: herring 0.5 kg to 1 kg; grass carp 0.4 kg to 0.75 kg; carp and carp length 13 cm to 20 cm; carp and carp length 10 cm to 13 cm; carp and carp length about 12 cm. Special fish specifications should also be larger.
Fourth, master density using a variety of fish polyculture, the density should be appropriate, not too dense. The number of fry stocks per acre of water should be controlled flexibly by reason of land and pond facilities. Common fish fry polyculture, the proportion of all kinds of fish should be: 55% to 60% of carp, carp 15%, grass carp 10%, carp 10%, carp, carp, etc. 5% to 10%.
V. Safety Management In winter and spring, the main task is to do a good job of antifreeze insulation. Once the weather is cold, water should be added to the fishpond in time to make the water depth more than 2 meters, so as to reduce the impact of the drop in water temperature on the fry. If the surface of the fish pond is frozen or covered with snow, it is necessary to remove ice and remove snow in time to prevent the fish from suffocating due to lack of oxygen. When the weather is clear in winter and the temperature of the water rises, some fine feeds can be properly fed to feed fry.
The practice of many fish farms and fish farming specialists has proven that putting fingerlings in winter can not only increase the survival rate of fry and reduce loss, but also promote early spring production and increase the yield of adult fish by about 30%. Therefore, winter fish species are worth promoting.