The story starts in the streams and lakes of the northwestern United States, where North American signal crayfish are a familiar sight.

它们起源于美国西北部的溪流和湖泊，美国北部的人民对小龙虾已经见怪不怪了。

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Allen Pleus, with the Department of fish and Wildlife in Washington State, says that the signal crayfish is an important species in his region.

华盛顿鱼类和野生动物的艾伦·普鲁伊斯说小龙虾在本地是很重要的物种。

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The North American signal crayfish, which had been introduced to English waters decades ago and spread steadily north, were taking over. "They were big animals."

北美标志性的小龙虾是在数十年前被引入英国境内，并且向北蔓延最后占据了水域。

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"I don't think we'll ever completely clear our rivers of red signal crayfish, " she said.

BBC: Study may help endangered white clawed crayfish

"Signal crayfish are having a catastrophic impact on white clawed crayfish", said Abby Stancliffe-Vaughan, who is organising the study.

BBC: Study may help endangered white clawed crayfish

Traps are being laid in the Brecks, on the Suffolk and Norfolk border, to see if the signal crayfish can be managed.

BBC: Study may help endangered white clawed crayfish