In a Wednesday, July 30, 2014 photo, In a Wednesday, July 30, 2014 pgoto, John Wittkamp, left, and Ethan Millard clean perch for customers at Stan's Bait & Tackle in Milford, Iowa, Three years after two Asian carp were netted in East Lake Okoboji, officials believe they stopped the voracious aquatic invaders. Officials believe a $1 million electronic fish barrier should be enough to keep more Asian carp from entering the lake system and threatening the $300 million tourism industry. (AP Photo/The Sioux City Journal, Tim Hynds)
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