Great Lakes barrier may be too weak to stop carp

Reuters: Voltage coursing through electrical barriers designed to keep invasive Asian carp out of the Great Lakes may need to be raised to keep out juvenile fish, U.S. officials said on Friday. The Army Corps of Engineers has mounted a multimillion-dollar effort to keep voracious Bighead and Silver Carp that now infest the Mississippi River Basin out of the Great Lakes, where scientists predict they could decimate the lakes' $7 billion fishery. "The current barrier operating parameters are effective......

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