Environmentalists fear that if the silver or bighead species of giant Asian carp reach the lakes they could starve out native fish species and devastate a $7 billion-a-year fishing industry.

• 环保人士担心，如果鲢鱼和鳙鱼这两种体型巨大的亚洲鲤鱼侵入五大湖区域，它们会大量抢夺本土鱼类的食物，致使这个年产值近70亿美元的捕鱼产业岌岌可危。