Add kitchen knives to the list of weapons that humans are using to fight invasive species. I'm talking about fish who've made their way into nonnative waters.
How do they get here? Sometimes they catch a ride in the ballast water of ships. Or they're imported as live food or dumped out of aquariums. Once here, they can wipe out native fish, trash the ecosystem and wreck the beach business.
Take the northern snakehead, which has made its way into tributaries of the Chesapeake Bay. It competes with native species for food, and then eats the native species, not to mention the odd frog or bird, with its mouthful of sharp teeth.
It's been called "Fishzilla." It breeds fast, has no natural predators and can grow to be 4 feet long. The northern snakehead hangs out in grassy shallows, making it hard to catch.
But a couple of years ago, Maryland started promoting the snakehead as an eating fish. Its harvest has increased from zero to 5,000 pounds a year.
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