1. Overwintering Pond Conditions The overwintering ponds require shelter from the sun and there is no leakage of water in the ponds. The water depth is maintained at more than 180cm. The bottom sludge is shallow and the organic matter is small.
2, winter management
2.1 Overwinter density of carp species In order to make winter carp species safely overwinter, reasonable density is an effective measure to improve the survival rate. According to the author's experience, ponds with better water quality and less silt and organic matter in the bottom of the pond can be safely overwintered per 667m2 of refrigerated wintering carp species 335.3-471.3kg.
2.2 Supplementary water source The supplemented water source is preferably underground well water. The source well should be within 500m from the wintering pool. Because the underground well water temperature is higher (10-11°C), the water layer of the injection hole is fast and the fresh water can be injected into the ice layer. The disadvantage is that the underground wells have lower dissolved oxygen. It is not advisable to inject the canal water during the wintering period. Due to the low water temperature in the canal, the ice layer in the inlet is slow to melt. Even supplemental water flows into the ice surface to form new thin ice. Increased ice thickness.
2.3 Drive the waterbirds over the winter to form ice pools before and after the formation of waterbirds. Before and after the ice thawing, pupa and mallards cluster in pairs. Sometimes groups of waterfowls infiltrate into the fingerlings to devour fishes regardless of day or night. The authors once witnessed day-old ducks and quail plunging into the fingerling pools to swallow underwater fish species. Throughout the entire process, the sound of wild ducks hitting fish species was also heard at night. In particular, the wintering ponds near the Great Lakes or the Mingshui River area must be attended by special persons before and after the ice thawing. The waterfowls can be driven by the turfgrass, sirens, and lights at night to prevent the species pools from being formed. Necessary bird damage.
2.4 Playing Ice Caves and Cleaning Snow in the Overwintering Pool Ice formation in the overwintering pool In the initial stage of thin ice formation, iron can be used to hit the ice sheet with other tools. Each iced hole of 1-2 1m2 per 300-500m2 is more tolerable than the ice. When it is large, at 9-11 a.m. every day, use a special tool for ice icing. Drill 1-2 ice holes for 1m2 every 500-800m2 and remove ice cubes. In case of snow days, the snow should be cleared in time in the wintering pool. When the snow is thick, the north and south direction of the snow can be stacked into strips to increase the intensity of sunlight and light transmittance.
3 Discussion
3.1 Enhancing feeding management before wintering As long as the water temperature is not less than 9°C, the carp species have a feeding phenomenon, and they should stick feeding once a day, which shortens the wintering period relatively.
3.2 Carp species Original source pond water The winter source original pool fertilizer provides the natural bait resource (plankton) to the carp species. When the bottom layer water temperature is 1.5 to 2.5°C after the formation of the ice layer, the intestines of the overwintering carp species are detected by anatomical microscopy. Undigested nauplii and rotifer remnants. In addition, on the sunny afternoon with snow on the surface of the ice, a pellet feed was used as a bait under the ice hole to hook the bottom hook, which means that the carp species are feeding under the ice.
3.3 The water quality and ecological environment of the original pond of winter carp and pond pond are more adaptable to carp, and at the same time the mechanical damage during the process of pulling, fishing, basket loading and transportation is avoided, and the intermediate link is reduced. Labor pays.
3.4 From the winter of 1999 to the spring of 2000, when the carp species were in the same pond condition, the same density, and the same management method, we found that the overwintering leaking pool (the bottom outlet was not well treated). Due to the regular supplement of the underground well water, the carp species was obviously wasted. Many, it is estimated that the leakage pool often supplements the underground well water of 10-11°C, so that the body of the wintering pond has a certain amount of exchange, the density of the biological resources of the natural diet is thin, the feeding rate of the carp is less, and the water flow of the water injection stimulates the carp. In this case, increasing the amount of activity consumes its own energy, causing the fish to appear wasting, while the normal wintering fish pond rarely supplements the underground well water, and the natural bait has a relatively large amount of resources, a large feeding probability, and a small amount of fish movement. Out of physique, strong swimmers
3.5 During the entire wintering period, the squid species spend most of their time under the ice. Because of the ice layer, the dissolved oxygen in wintering ponds is lower than that in the clear water stage, but the temperature in wintering ponds is only 1.5-2.5°C, and the amount of fish species is active. Small consumption of oxygen. On the contrary, the ice-covered period created a safe place for wintering squid species and was not vulnerable to birds, thus increasing the survival rate and reducing economic losses.
3.6 The temperature rises gradually in mid-March. After the ice melts in the pond, when the water temperature rises to 8°C, the pellet feed is fed every winter afternoon on the Yangyangyangyang surface, every 667m20.6-1.8kg, when the water temperature rises to around 11°C. After the feed is stopped, the overwintering fish species can be raised in ponds. Even though the ice layer melts, the feeding time is only 15-18 days, prompting the puffer fish to feed the pellet feed again and lay the domesticated food pellets after the ponds. basis. Practice has proved that this method does have a particularly significant effect on the domestication and feeding of common carp species.
Bale net is a kind of plastic woven net which is used for silage bale, grass bale, hay packing, etc. Bale net is fast becoming an attractive alternative to twine for the wrapping of hay bales.
Bale net is made by the machine with the cross stitch. About raw material, bale net is made of high density polyethylene which is environmental friendly, can meet resistance requirement of the ultraviolet intensity both in Northern and Southern Hemispheres, and is suitable for all crops under all conditions.
Bale net is usually made by rolls for its convenient to put into the Bale Machine. The machine can pack the hay with bale net only, and also can pack the hay first with bale net, then pack with plastic Silage Wrap outside.
The tension of each thread of the bale net is not less than 60N (6.12KG or 13.5pounds). In each roll, the last 450 feet have 4 inches width cordon, which can remind worker to prepare the new roll in advance.
Specifications of Bale Net:
Width of bale net: 1.23m, 1.25m, 1.28m, 1.3m, 1.5m, other size can be customized.
Length of bale net: 2000m, 3000m, 3600m, other size can be customized.
Inner Core: paper core.
G/M2: 8G/M2, 9G/M2, 9.5G/M2, 10G/M2, etc.
Inner Core Size: 3``/76mm.
Color of Bale Net: White, Green edge, Blue edge, Red edge, other colors can be customized.
Package: Bale net rolls are usually packed on pallets. The pallet size can be 1.2*1.0m, 1.1*1.1m, or other size. Bale net is stacked one by one on the pallet, and then fastened by packing belt to make them stable.
bale wrap netting, silage bale net, knitting bale wrap, woven bale netting, plastic wrap net, PE wrap netting
Zibo Maoyang Industry and Trading Co.,ltd , http://www.mysilage.com