The brief history of world commercial fishing indicates the result of over-fishing, which caused many problems of environment and economy. In the first place, sharp cut-off of marine organism would result in broken ecological balance, including an excess of aquatic plant followed with water polluted. In the second place, fishery without limits does not fit for sustainable development.[导致的影响不全面，一个是导致食物链(food chain)失衡，再者是对生物族群进行了自然选择，改变了动物习性，使得原本食肉的鱼类没有东西吃了就可能转而进攻人类。]
Thus, policies and regulations should be taken to impose restrictions on fishing. At the same time, making the commercial fishermen realise the harm of unplaned fish-catching is another point government should emphasis on. Only through these ways can human beings benefit from the nature for a long time.[写得比较笼统，不具体。例如可以写改变一些传统习惯（例如日本每年要捕鲸，加拿大每年要屠杀海豹），大力发展近海养殖技术，减少对大洋鱼类的依赖等。]
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