Bighead and silvercarp - both native to Asia - have been migrating toward the lakes since escaping from Deep South fish ponds and sewage treatment plants in the 1970s.
原产于亚洲的大头鲤鱼和银鲤鱼,20世纪70年代从南方鱼塘和污水处理厂逃逸以来,已经向五大湖扩散。
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And if their voracious eating habits weren't enough, silvercarp pose a direct threat to boaters.