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COLUMBIA, Md.—The state of Maryland has had a take-no-prisoners approach to the northern snakehead, a slimy, toothy invasive fish native to Asia.
When hundreds of mostly juvenile snakeheads turned up in a pond in Crofton, Md., in 2002, the progeny of discarded pets dumped by one owner, the government poisoned the pond. Two years later, when an angler caught a snakehead in a lake 25 miles west, Maryland drained the lake.
But…