Photo: Invasive "Walking" Fish Not Wreaking Havoc Yet, Scientists Say

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The northern snakehead seen here was caught in a May 2005 Dogue Creek survey conducted by the Virginia Department of Game and Inland Fisheries.

The snakehead has established itself permanently in the Potomac River, experts say, but the fish haven't wreaked havoc on the local ecosystem—yet.

Photograph courtesy Brett Billings/U.S. Fish and Wildlife Service

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