Snakeheads are hardy, fast-growing, voracious and prolificThe northern snakehead is known as "Frankenfish" and "rattlesnakes with fins," and some chefs say one way to stop the predatory, fast-spreading fish is obvious - with a fork. With a reputation as fearsome as its name, the voracious snakehead fish has intruded throughout much of the Potomac River basin in Virginia and Maryland in the last decade, snapping up anything that gets in front of it. Putting the torpedo-shaped snakehead on the menu is Washington-area restaurants' way of helping to control the Asian newcomer. Chefs said they have a key weapon on their...