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商业水产养殖业从南纬50度的智利到靠近北极圈的挪威,从渔塘到水渠养殖着各种鱼类和甲壳动物.其种类繁多,绝大多数品种未加改良属野生,尽管死亡率较高,但饲料利用率等同于现代肉鸡生产.据预测,到1995年全世界大麻哈鱼和虾类总产量分别可达250万吨和110万吨,其中水产养殖的产量分别占25%和30%.其实,预测增长与实际产量并不完全一致,其主要影响因素包括:①当地海洋和内陆水域渔业的生存能力;②水面的成
Commercial aquaculture Breeds of fish and crustaceans are raised from the ponds to the aquariums from Chile, at 50 degrees south latitude, to Norway, close to the Arctic Circle, with a wide variety of species, most of which are wild without modification, although mortality But feed utilization is equivalent to the production of modern broilers.It is predicted that by 1995 the total output of salmon and shrimp in the world will reach 2.5 million tons and 1.1 million tons respectively, of which aquaculture production accounts for 25% and 30%. In fact, the predicted growth is not exactly the same with the actual output. The main influencing factors include: ① Survival ability of local marine and inland water fishery;