论文部分内容阅读
引言天津市是我国主要的工业基地之一。随着工业的迅速发展,对水质污染的处理日趋复杂。并对污水养鱼的商品鱼质量污染情况,含毒物质的成份、含量,鱼体积累情况,对人体健康的影响等,提出了许多疑问。为此,对污水养鱼的前途问题提出了许多较为复杂的问题急需解决。另外,从天津市池塘养鱼状况看,四郊五县池塘养鱼的面积达四万亩,其中90％的地塘养鱼是不利用污水的,多数生产单位的科学养鱼知识较少,目前产量很低,甚至亩产才几十斤,一般平均为百斤左右,而且多
Introduction Tianjin is one of China’s major industrial bases. With the rapid development of industry, the handling of water pollution is becoming increasingly complicated. And raised many questions about the pollution of the quality of the commercial fish in the sewage water, the composition and content of the poisonous substances, the accumulation of the fish body, and the impact on human health. For this reason, many more complicated problems that are proposed for the future of sewage and fish farming are urgently needed to be solved. In addition, from the perspective of fish ponds in Tianjin, the area of fish ponds in four counties and five counties amounts to 40,000 mu, of which 90% of the pond fish do not utilize sewage, and most production units have little knowledge of fish culture. Currently, Yield is very low, even a few pounds per mu yield, the average is about a hundred pounds, but more