A lionfish swims among a school of glassfish in Egypt's Red Sea. The picture won third place in the "Reefscapes" category. (See more coral reef pictures.)

Recently in the U.S., lionfish have begun expanding their range up the East Coast. The fast-multiplying invasive species is venomous and voracious, sparking a federal "Eat Lionfish" campaign and environmentalist-sponsored lionfish-hunting contests, according to the Wall Street Journal.

(See pictures of undersea Indonesia in National Geographic magazine.)

Pictures: Best Underwater Views of 2010 Announced

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