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Forget Nessie: there's another insidious creature living in the waters of Scotland. The story starts in the streams and lakes of the northwestern United States, where North American signal crayfish are a familiar sight. Turn over a rock and you may well encounter one. But in Scottish streams and lochs, these creatures are intruders. American crayfish may be destroying the catch. 别去想什么尼斯湖水怪了，苏格兰的水域中潜伏着另一种有害生物。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。翻开一块石头就能发现一只。然而在苏格兰，这种生物却是入侵者，美国小龙虾可能会毁掉苏格兰的生态。 Allen Pleus, with the Department of Fish and Wildlife in Washington State, says that the signal crayfish is an important species in his region. It's the only native crayfish species, and the freshwater crustaceans are are just another part of the ecosystem. "They play well with others," he says. "They've learned to be good neighbors with the other native species." But those same crayfish wreak havoc in Scottish waters. 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。这是唯一的本地小龙虾种，而淡水甲壳动物是生态系统的另一部分。“它们彼此相处得很好，和其他本地物种也相处融洽。”但是同种的小龙虾却在苏格兰肆虐。 | 
