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Box nets consist of floating frames, anchors and mesh bags. The floating frame is a frame floating on the water surface. It has a square or round shape and is used to support the mesh bag and double as a working platform. The size of the square box net is 10 meters (long) 10 meters (width) 8 meters (deep), 6 6 meters 6 meters, 3 meters 3 meters 3 meters, etc., and a series of multi-port box network system, a circular 12 meters (diameter) 8 meters (deep), 16 meters 10 meters, 20 meters 12 meters and so on. Anchor blocks made of concrete blocks are used to tie cables with iron chains, steel wires, nylon ropes, and special multi-strand ropes. The net bag is a paradise for fish. A net is added to the net bag to prevent the fish from jumping out. The mesh size of the net bag increases as the fish grows.
In order to avoid damaging strong winds and waves, the box nets were previously chosen to be installed in the waters of the Nei Wan. However, after a long period of cultivation, the sediments often deteriorated and the water quality became better. As a result, toxic algae bloomed and red tides formed, so now Toward the development of the sea.
The currents in the open sea are relatively strong, and it is easier to disperse the cultured baits and the excrement of fish, which is conducive to maintaining a good culture environment. At present, many advanced fisheries countries are competing to research and develop offshore box net aquaculture technology. When the typhoon strikes, the box nets can sink down to eight to ten meters below the water surface to avoid the destruction of strong winds and waves.
Squid box net culture is the most successful example of marine culture. In 2000, global production reached more than 1.54 million metric tons, accounting for 66% of the total production of catfish (including wild squid). Norway is the leader of salmon farming, and its production in 2000 accounted for 43% of the world's farmed salmon production. In more than two decades, the trout farming industry in Norway has started from scratch, and now high-tech, automated aquaculture technology and strict management systems have been established. It is a best example of marine aquaculture for enterprise and factory production. .
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Marine box net breeding potential is endless
The ocean accounts for about 71% of the surface area of ​​the earth, so it has vast waters for the development of marine culture. In Japan, Norway, Chile, the United States, Canada, the United Kingdom, France, Spain, Greece, Australia, and China, marine aquaculture is well-developed. The seafood market is full of high-quality green ginseng, red ginseng, jia fish, grouper, flounder, squid, black mullet, red whiting, sea bream, yellow ginseng, and many are marine Box net breeding masterpiece.