Families live in mud-built huts along the Niger River, where fishermen in paddle-powered boats cast nets for catfish and carp.

沿着尼日尔河分布着各式家庭，那里驾着划桨船的渔夫撒网捕捞鲶鱼和鲤鱼。

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Asian carp—including thecommon, black and bighead variety—were brought to the U.S. in the 1970sas live vacuum cleaners meant to remove algae and suspended matter fromponds.

上世纪七十年代，作为清除池塘中藻类和漂浮物质的活真空清洁器，亚洲鲤鱼——包括普通、黑色和大头品种——被引入美国。

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Carp live in the lake.

鲤鱼生活在湖里。

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Some of the Chicago DNA was found in Lake Calumet, where a live bighead carp was caught in 2010.

WSJ: Report: Asian carp may have reached Great Lakes

But the Jerde team's paper, published online Thursday by the Canadian Journal of Fisheries and Aquatic Sciences, argues that the likeliest explanation remains the presence of live Asian carp.

WSJ: Report: Asian carp may have reached Great Lakes

But while the government team acknowledges the presence of Asian carp genetic fingerprints, it disagrees that they necessarily signal the presence of live fish.

WSJ: Report: Asian carp may have reached Great Lakes