野生鲑鱼面临的威胁(2)【沪江慢速VOA080127】
The researchers say they used information from the Canadian government from nineteen seventy to the present. They studied fourteen populations of young wild pink salmon came in contact with salmon farms. They compared these populations with one hundred twenty-eight populations that did not have such contact.
The scientists say the populations were dying out in the areas near salmon farms, but other populations stayed healthy. They note that earlier research on this issue had similar results. Sea lice travel from inland rivers to the ocean. The lice eat the muscle and skin of young fish. Adult fish do not seem affected. Older, bigger fish have thicker skins.
An official of NOAA, the National Oceanic and Atmospheric Administration in the United States, said facts do not support the new study. He said many conditions affect salmon. One is the salt content of the water. Another is the presence of predators that attack the fish. Still another is the amount of fishing that takes place in the area.
Demand for fresh salmon is growing. Now, almost seventy-five percent of the salmon that Americans eat comes from fish farms. And Congress is considering legislation that could permit many more fish farms.
参考译文：
研究者称从1970年至今一直使用从加拿大政府获得的信息。他们研究了与鲑鱼养殖场有接触的14个种群的野生粉红幼鲑, 把它们与128个没接触过(养殖场)的种群进行了比较。
科学家称靠近鲑鱼养殖场附近区域的这些粉红鲑种群正行将灭绝。但其余的品种却十分健康。他们注意到之前相关的研究也得到了相似的结论。海虱子通过内陆河流传播到大洋中。他们吞噬着鱼幼苗的肌肉和皮肤，而由于成年鱼有着更厚的皮肤，虱子看起来对它们没什么影响。
一位NOAA（美国海洋和大气管理和研究局）的官员称事实并不支持研究成果，他说许多条件都会对鲑鱼造成影响。一个是海水的盐分。另一个是海水中捕食者的存在会威胁鱼类的生命，而发生在此区域中捕鱼活动的总量也是原因之一。
如今，对于鲜鲑鱼的需求正与日俱增。几乎美国消耗的75%的鲑鱼来自于养鱼场。同时国会正考虑立法以批准建立更多的养鱼场。
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