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Louisiana crawfish caught in waters in and around Berlin are on display at Fisch Frank fish restaurant in Berlin. They are an invasive species and authorities recently licensed a local fisherman to catch them and sell them to local restaurants. Carsten Koall/Getty Images hide caption

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Carsten Koall/Getty Images

For Berlin, Invasive Crustaceans Are A Tough Catch And A Tough Sell

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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. Ari Shapiro/NPR hide caption

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Ari Shapiro/NPR

American Intruder Lurks In Scottish Streams, Clawed And Hungry

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A commercially harvested crayfish from Lake Tahoe near Incline Village, Nev., in July. Max Whittaker/Prime for NPR hide caption

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Max Whittaker/Prime for NPR

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 hide caption

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L. Brian Stauffer/UI News Bureau