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Watercraft inspection sign for invasive aquatic species
Watercraft inspection sign for motorboats and sailboats to prevent invasive aquatic species entering Blue Mesa Reservoir, Colorado, USA. Colorado's mandatory inspection program aims to keep zebra mussels, quagga mussels, New Zealand mudsnails, Eurasian watermilfoil, Asian carp, and rusty crayfish out of the state's waters. Photographed at Curecanti National Recreation Area, Colorado, USA., by JIM WEST/SCIENCE PHOTO LIBRARY
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