In the northwestern United States, this crayfish would be just a friendly bit of local fauna. But in Scotland, it's an invasive species wreaking havoc on trout streams.
October 12, 2014 Scotland has some of the best trout fishing in the world. Now the North American signal crayfish is taking over waterways, threatening to wipe out native populations of insects those trout eat.
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A commercially harvested crayfish from Lake Tahoe near Incline Village, Nev., in July.
Max Whittaker/Prime for NPR
August 14, 2012 Nevada recently green-lighted a project to harvest crayfish in Lake Tahoe. It's the first time since the 1930s that commercial fishing has been allowed in the lake. The venture is small, but the hope is that it will keep the lake clear of algae — and provide a local dish for area visitors.
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The new species, Barbicambarus simmonsi (left) is more than twice the size of typical crayfish found in the same creek.
L. Brian Stauffer/UI News Bureau
January 20, 2011 It may only be about 5 inches long, but that's about twice the size of most others. And until now, it had not been known to exist. But researchers who had heard there might be such a beast found it under the last rock they turned over.
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