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Invasive Species in the United States

Snakehead Fish Picture (National Geographic)
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Native to China, the northern snakehead—found in recent years in Maryland ponds and the Potomac River—is distinguished by its small head, large mouth, big teeth, and ability to wriggle across land. The fish, which grows up to 40 inches (100 centimeters) long and can weigh up to 15 pounds (6.8 kilograms), is a voracious feeder. It can decimate native fish stocks in North American waters. The fish can survive for several days out of water.

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Photograph courtesy Maryland Department of Natural Resources
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