Problem solved. Or so it appeared. Two years later, northern snakeheads fulfilled biologists’ worst fear and showed up in the Potomac River. Experts worried that snakeheads in the Potomac ...

Snakeheads were illegally dumped into a pond in Crofton, Maryland two years earlier. They spread into the Potomac River drainage, eventually making their way into Virginia streams. They finally ...

(Read more: Fishermen battle invasive ‘frankenfish’ snakeheads.) The largest U.S. invasive population lives in the Potomac River drainage of the Chesapeake Bay watershed. In 2002, a snakehead ...