Qingshui fish (grass carp, squid, squid, etc.) is a kind of aquatic product with unique flavor and quality, which is produced by using pure, natural green plants as the feed in the natural environment of mountainous areas, using clear, perennial springs and streams. Qingshui fish is favored by people for its unique breeding methods, unique nutritional value and delicious flavor. 1 Aquaculture environmental conditions The natural ecological environment of clean water fish farming should be clean, fine, free of any pollution, rich in water sources, and ensure continuous water flow for many years. After testing, the pH of aquaculture water in these areas is around 7.2, the oxygen demand for biochemical oxygenation does not exceed 0.2 mg/L, and the dissolved oxygen exceeds 9.0 mg/L. All other health indicators are better than the national standard “Water Quality Standards for Non-polluted Food Freshwater Aquacultureâ€. . 2 The construction of ponds and fish ponds will be built in the construction of ponds and ponds, beaches, lands and places where light is long. According to the terrain conditions, it is appropriate to excavate rectangular, square or other shaped ponds. The area of ​​fish ponds depends on the size of the water flow, generally within 10-50 m2. If the area is too large, the whole pool of water is not easy to flow and it is unfavorable for farming. The depth of the pond is basically based on the self-discharge of water and the water depth of 0.7-1.0m. Tanggu is built with stones or cement, generally without slopes. The height should be more than 0.5m above the high water level. The bottom of the pond is laid with small pebbles, sand or stones, and the hard bottom is easy to clean. Above the pond, according to the need to build a partial shading scaffolding, planting some fruits and plants on the scaffolding in the appropriate season, is conducive to shade in the summer cooling. The location of the water inlet at Tangjiao is the same as or higher than the high water level, and the water outlet is located at the bottom to facilitate drainage and management of future discharge. Inlet and outlet also need to set a fish bar, both anti-fish escape, but also block floating debris. 3 Fish breeding stocks should be cleaned and disinfected 15 days before stocking. Each m2 fish ponds with lime 0.3kg or bleaching powder 20g dipping water pond, 2-3 days after the drain pool water, sun 10 days or so, the water stocking. Qingshui fish stocking mainly grass carp, a small amount of carp, carp, Qing fish. Restocking time starts after the beginning of each year and around the Spring Festival. Fish species specifications require a body length of 15cm or more, and the age-old grass tail weighs about 250g. The stocking density is generally about 10-13 tails per m2. Before stocking, the fingerlings must be soaked with 3% salt solution for 15-20 minutes before being sterilized. 4 The “Sanding†feed for clear water fish is mainly based on natural or artificially grown green feed, supplemented with other bud feeds such as grain buds and malt, and not fed any compound feed. Timing: 2 times a day, 8: 00 - 9: 00 am, 3:00 pm - 4: 00 pm 1 time; Qualitative: green feed fresh, delicate, non-polluting, other feed fresh; quantitative: eat eight minutes full of fish Prevail, that is, the feed is eaten by the fish in about 3 hours. 5 Adjusting water flow regulation is an important measure for clearwater fish farming and management under small area and high density conditions. In principle, the size of the flow can be controlled according to the season. Spring: After the wintering of the fish, the physical strength is poor, and the fish species need to adapt to the flow from the still water to the flowing water environment. Therefore, it is necessary to live in slow-flowing water for a period of time. Pool water exchange is generally controlled 1-2 times a day. Summer: It is a long season for fish, with a large amount of oxygen. The amount of water exchanged in the pool is 3-5 times per day. Fall: To properly control the amount of water flow, the exchange of pool water is about 2-3 times a day, so that the body strength will not be consumed excessively, and it will be beneficial to winter. In winter: The water temperature is low, the fish activity is small, the metabolism is slow, micro-flowing water is given, and the amount of pool water exchange can be about once every day and night.
Knitting Woven bale wrap netting can be also made into width 1.3m, length can be 2000m,3000m,3600m, etc.
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As the silage bale usually be stacked outdoor, the bale wrap netting should also be UV-resistance, ageing resistance.
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