Persecuted by anglers and deprived of places to spawn, the alligator gar — with a head that resembles an alligator and two rows of needlelike teeth — survived primarily in southern states in the tributaries of Mississippi River and Gulf of Mexico after being declared extinct in several states farther north. To many, it was a freak, a "trash fish" that threatened sport fish, something to be exterminated.
But the once-reviled predator is now being seen as a valuable fish in its own right, and as a potentially potent weapon against a more threatening intruder: the invasive Asian carp
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